Ceramic Manufacturing Research Articles

Material extrusion additive manufacturing of advanced ceramics: Towards the production of large components

Thermoplastic extrusion based additive manufacturing (MEX-AM), is a very interesting fabrication method for the shaping of larger ceramic parts. Commercial filaments are currently available in the market, but due to the lack of information from the suppliers, it is not easy to select the suitable filament material for the 3D printing of individual ceramic objects. In this study, three commercial yttria-stabilized zirconia (YSZ) filaments provided by Fabru GmbH, SiCeram GmbH and PT+A GmbH were investigated. According to our results, it is possible to print YSZ filaments with extremely different flexibility and rheological properties. Compared to the other two filaments, the Fabru filament resulted in significantly higher flexibility, but the extrusion pressure to print it through a 0.25 mm nozzle was significantly higher at 150 °C. Interestingly, in the SiCeram filament, a grain orientation effect could be observed. Based on STA analysis it can be assumed that for the Fabru filament, the polymer which decomposes at a high temperature can already be removed by solvent debinding (SD). Finally, 70 mm tall cup structure including overhang features and different wall thicknesses was used to evaluate the printing and post-processing of YSZ filaments.

Simple Ceramics? Design, Decorative Materiality and Anabaptist Pottery in Early Modern Central Europe

Abstract This article traces the manufacture and consumption of faience ceramics made by Hutterite communities in central Europe from the sixteenth to nineteenth centuries. The production, use and survival of Anabaptist Haban ware offers insights into the nature of Anabaptist material regimes and communities and into overlapping but distinct communities of consumption and collecting. Hutterite craftsmen were instructed to produce objects ‘in the same way as was always done’, with regulations about uncomplicated designs and colours. Yet faience Haban ware was highly sought after, and decorative items were made for powerful patrons from materials drawn from all over Europe. Such objects have now become associated with specific national ‘folk’ cultures. These distinctive remnants of Hutterite communities in Germany and central Europe problematize the material dimensions of survival, conformity and separatism in Anabaptist communities and give access to the complicated affective properties of the white faience ware that Hutterites produced.

Study on Consumer Buying Behavior of Ceramic Tiles using Multi-criteria Decision Making

The main purpose of this research work is to explore the consumer priorities, preference of consumers on buying Ceramic Tiles. The study will also focus on understanding the key factors which triggers the consumers purchasing decision of ceramic tiles. A detailed study has been planned to identify the different criteria which will be the deciding factors of selecting ceramic tiles from a particular brand. Comparison has been made by considering some leading brands available in Indian market in the ceramic manufacturing and business. Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) as a multi criteria decision making (MCDM) tools has been used to accomplish the research objectives.

Pathways to Female Job Satisfaction: Quantitative Analysis of Influencing Factors

This study aims to investigate the impact of work-family conflict, non-physical work environment, and job stress on job satisfaction among female employees within a ceramic manufacturing organization. Employing a quantitative research design with hypothesis testing, a sample of 100 female employees from PT. Roman Ceramics International was surveyed using reliable and validated Likert-scale questionnaires. The data underwent rigorous statistical analysis, including multiple linear regression, determinant coefficient (R2), partial correlation coefficient, t-test, F-test, and classical assumption tests using SPSS version 18. The findings indicated that work-family conflict, non-physical work environment, and job stress collectively and individually influence employee job satisfaction. Notably, the competency variable emerged as the most influential factor. This research provides valuable insights into the complex dynamics affecting job satisfaction among female employees, offering implications for organizations seeking to enhance employee well-being and overall organizational performance.
 Highlights:
 
 The study explores the factors influencing job satisfaction among female employees, focusing on work-family conflict, non-physical work environment, and job stress.
 The research adopts a quantitative approach, utilizing multiple linear regression analysis and statistical tools such as t-tests and F-tests to examine the relationships between variables.
 The findings highlight the significant impact of competency on job satisfaction, emphasizing its crucial role in enhancing the overall well-being and performance of female employees.
 
 Keywords: Job satisfaction, Female employees, Work-family conflict, Non-physical work environment, Job stress

PHYSICOCHEMICAL PROPERTIES ANALYSIS OF LOCAL CERAMICS WITH ACTIVATED CARBON ADDITIVE BASED ON RUBBER FRUIT SHELLS AS THERMAL INSULATORS

Many building materials that function as insulators to maintain indoor temperature stability during hot weather have been developed. One of them is porous ceramics applied to building walls as heat absorbers. Research related to the manufacture of porous ceramics began to emerge to find the optimal composition when applied as an insulator that can absorb heat well. In general, porous ceramics use activated carbon as a pore agent. Activated carbon can be obtained by carbonating agricultural wastes such as coconut shells, hazelnut shells, rubber fruit shells, rice husks, and cocoa shells. Research continues to develop in finding the best-activated carbon base material according to the required material characteristics. Researchers will take advantage of the abundant potential of local natural resources. The method used to make porous ceramics is to mix clay and activated carbon with a clay-carbon composition ratio of 100:0, 90:10, 80:20, 70:30, 60:40, and 50:50. The sample is made by mixing the two materials and then printed by dry pressing method with a load of 5 tons held for 10 minutes. After the sample is dried at room temperature, it is sintered at 900oC with a holding time of 3 hours. Next, the sample is characterized by determining density, porosity, and water absorption and then tested for thermal properties. After that, the surface morphology and elements in the sample are seen. The optimum composition of clay-carbon mixture is 70:30 grams. Ceramics using activated carbon from rubber fruit shells are suitable as building construction materials as heat insulators because they can absorb heat up to 500oC.

Low-cost ceramic membranes manufacture using INKJET technology for active layer deposition and validation on membrane bioreactors

The fabrication of eco-friendly ceramic membranes based on low-cost raw materials, using digital INKJET printing techniques for active layer deposition and its validation in a membrane bioreactor (MBR) has been studied. The raw materials used in the manufacture of the support layer were UA50/2 clay, chamotte, calcium carbonate and potato starch. A MBR laboratory plant was operated to treat municipal wastewater with three ceramic membranes with different grammages in the selective layer deposition. The membrane performance at laboratory scale was evaluated in terms of transmembrane pressure (TMP) evolution for a constant permeate flux, permeate quality and mixed liquor characteristics. From these experiments, it was selected the membrane which obtained the lowest TMP profile maintaining appropriate water quality parameters (chemical oxygen demand (COD) removal percentage around 90% and turbidity around 0.06 NTU). This membrane was also operated at pilot plant scale in order to validate it at higher scale. Results indicated that TMP values were in the range of 0.06 and 0.1 bar, COD removal percentage was around 98% and microbiology analysis demonstrated that the quality of the effluent, according to European regulation 2020/741, can be classified as Class A and it can be reused for non-potable purposes.

Sharing ceramic manufacturing processes: A technological and petrographic study on ceramic production and exchange between Hispaniola and Puerto Rico (350–1200 CE)

This study investigates the production and distribution of ceramics across the islands of Hispaniola and Puerto Rico during the Ceramic Age (ca. 800–500 BCE to 1500 CE). The ceramic assemblage from El Frances, Dominican Republic, is analyzed and compared with five other sites from Puerto Rico (Hacienda Grande, Tecla, La Gallera, Dorado-42, Sorcé). Petrographic analysis clarifies the origin of raw materials and the preparation of the clay body. Results show an initial phase (ca. 350–900 CE) of Saladoid ceramics at El Frances that appears to be similar to the Puerto Rican sites in the processing and the origin of some of the raw clay materials. Between ca. 900 and 1200 CE, evidence from El Frances shows technological change, suggesting a process of socio-cultural transformation. This change entailed the production of very coarse and heterogenous ceramic bodies and the use of locally accessible clays originating from metamorphic parent rocks. The heterogeneous paste preparation is comparable with other contemporaneous sites such as El Flaco and La Luperona, located in the central north, and El Cabo on the east coast of Hispaniola. This study adds insights to manufacturing practices in ceramic production across a long-term period and shows evidence of the occurrence of similar “ways of doing” between distant communities across Puerto Rico and Hispaniola.

A novel dry granule preparation technology and comparison of granule properties with conventional wet system for ceramic tiles production

The ceramic tile manufacturing process uses a lot of energy, mainly thermal energy, and to a lesser extent electric energy. Total energy costs account for between 50% and 55% of average direct manufacturing costs. Fossil fuel combustion, such as natural gas combustion, produces carbon dioxide emission. Therefore, energy consumption and emissions issues are vitally important for both environmental effects and process costs in ceramic tile manufacturing. The wet process of granule production systems including wet grinding and spray drying is widely used for the production of granules. Although there is high energy consumption for the water evaporation in the spray dryer, it ensures to produce high quality tile for many years. In this study, important granule properties were introduced for a novel dry granule production system. In the successful application of a dry granulation system, the conformity of produced granules is vitally important such as particle size distribution, bulk density, flow properties, and moisture of granules and conformity for the pressing process. This paper includes the comparative studies for properties of granules produced in spray dryer and new dry granule preparation systems and the full results of the industrial trials with these granules. The cost comparison of both granule production systems was also made for the same raw material usage. The natural gas consumption and water consumption were reduced respectively from 46 to 15 m3/ton and from 540 to 95 liters/ton in the new dry granulation system while electricity consumption and maintenance costs remain almost the same in both systems.

ПРЕДВАРИТЕЛЬНЫЕ РЕЗУЛЬТАТЫ ТЕХНИКО-ТЕХНОЛОГИЧЕСКОГО АНАЛИЗА КЕРАМИКИ ЭПОХИНЕОЛИТА И БРОНЗЫ С ПАМЯТНИКОВ КРОХАЛЁВКА-5, 11 (СЕВЕР ВЕРХНЕГО ПРИОБЬЯ)

The article presents the first results of a study of a sample of ceramics from the burial ground and the settlement of Krokhalevka-5, 11 (north of the Upper Ob region). The studies were carried out within the framework of the historical and cultural approach according to the method of A.A. Bobrinsky. The main task was to determine the specifics of cultural traditions in the selection of raw materials, the preparation of molding masses, the features of the working edge of ornaments by their imprints and a comparative analysis of the data obtained. The study was conducted of 22 specimens, belonging to five cultural and chronological groups of the Neolithic — Bronze Age: Kiprinskaya, Krokhalevskaya, Odinovskaya and Krotovskaya, the fifth group combines ceramics with an unclear cultural attribution of the early — developed Bronze Age. Most of the fragments come from open or conditionally closed (pits, ditch) archaeological contexts, and most oft en from the soil layer. It has been established that for the manufacture of ceramics, ferruginous clays with different amounts of natural sand impurities were used. 8 recipes for the composition of molding masses have been recorded. Clay + grus + organic solution prevails. The local traditions include the addition of crushed stone, and the brought ones — fireclay. In the earliest ceramic groups of the site, an unusual tradition of adding animal hair was revealed, which has analogies on the sites of the northern foothills of the Altai and other territories in the Neolithic and Early Bronze Ages. The highest degree of similarity was noted for the Kiprinskaya and Krokhalevskaya vessels with ceramic complexes of the northern foothills of the Altai, the Upper Ob region and the north of the Kulunda steppe, both in terms of the composition of the molding masses and the tools for applying the ornament. The data obtained are of great importance for the characterization of the ceramic complexes of the Neolithic — Early Bronze Age in Siberia.

THE USE OF CERAMIC FILTERS IN THE SMELTING OF WORKPIECES FROM HEAT-RESISTANT ALLOYS

To improve the operational characteristics of gas turbine engine blades, it is necessary to use new methods of cleaning and refining metal. Melt filtration is an effective way to improve casting quality.According to the conducted analyses, it was determined that the amount of conditioned waste generated during the smelting of products reaches 27% of the mass of the spent charge, and non-conditioned waste rejected during LUMMA control is 23%. The results of the statistical analysis show that the total amount of waste generated during the smelting of gas turbine blades is, on average, 60–70% of the weight of the loaded charge.The purpose of the work is to create a new composition of the ceramic mixture for the production of high-strength filters, as well as the development of technology for the production of gas turbine parts using them.The analysis was performed on samples of heat-resistant corrosion-resistant alloy CM88Y. The alloy for research was melted from the primary charge on the UPPF-3M foundry unit. As a result of the work carried out, a new rational composition of the mixture for the manufacture of ceramics was created, which allows to increase the characteristics of strength and heat resistance. An instruction was created for the manufacture of ceramic filters at machine-building enterprises. To eliminate damage to ceramic rods in blades under the influence of thermal shock, improved systems for filtering metal in a liquid state and filling ceramic molds are proposed. Uniform temperature distribution across the cross-section of the casting also reduces the number of defective products.

Fabrication of hierarchical lattice structures from zirconia stabilized ceramics by micro-SLA 3D printing approach

The need for the new materials and advanced manufacturing techniques for achieving the highest characteristics of energy devices is an obvious trend. One of the possible ways to create structures for energy applications is to introduce complex geometries and promising features with additive manufacturing (AM). Using this approach, it is possible to create complex geometry and moreover decrease the weight of materials. In this paper, we developed the layer-by-layer fabrication approach of ceramic hierarchical lattice structures via the (micro-SLA) technology. As a feedstock material, the novel composition of partly stabilized-zirconia ceramics (6ScSZ, 8YSZ) was developed. Materials were selected as a solid slurry component due to high ionic conductivity at the working temperature of modern solid oxide fuel cells (SOFCs). For the sintering, the green body heat treatment process was optimized to one step, which decrease the time and production cost. The data from scanning electron microscopy and micro-CT shows that 112-layer samples of the octet truss did not show any critical defects, and the achieved relative density was close to the theoretical one. Totally, 22 samples with the total size of 6.5 mm * 6.5 mm * 2.8 mm and the diameter of struts in the range of 240–250 μm were fabricated at a rate of only 56 min per sample, using two modifications of advanced doped zirconia-ceramics. This study opens new opportunities for the development and transfer to the production of additive manufacturing of ceramics to build energy systems devices such as solid oxide fuel cells.

Incorporation of Eichhornia crassipes dry biomass in red ceramics aiming at energy savings during the firing stage

The natural variability of clay characteristics and the use of relatively simple processing techniques for the manufacture of red ceramics make it easy to incorporate various types of waste. Among these wastes, fuels have high calorific value due to the amount of organic matter and favor the energy saving in the firing of ceramic products. This research aimed to study the viability of using a phytoremediation waste, dry biomass of Eichhornia crassipes, in the production of red ceramics. After the raw materials characterizations, ceramic pieces with 5 compositions (0, 2.5, 5, 7.5, and 10%wt. Of biomass) were prepared by vacuum extrusion. The pieces were oven dried for 24h then fired at 650, 850, and 1050 °C and had their mechanical properties of dry density, fired bulk density, linear shrinkage, water absorption, and mechanical strength tested. Results showed that incorporations up to 5% of the biomass did not significantly alter the density and the linear shrinkage of the ceramic pieces. The biomass contains 37.7% w/w of carbon and a high calorific value (2.389 kcal/kg) and the ceramic firing stage causes the combustion of the biomass organic compounds, which increases the porosity of the pieces. Therefore, an increase in biomass content tends to enhance water absorption and reduce mechanical strength. Even so, incorporations of 5% of biomass met the standardized limits for red ceramic products and as its firing releases heat that can be harnessed to the process and save up to 51% of energy, its incorporation can be beneficial to the ceramic industry. Furthermore, it represents savings of raw materials for the ceramic industry and an environmentally friendly destination for the waste that would otherwise be landfilled. The incorporation of biomass of Eichhornia crassipes was proven to be feasible, but the quantity and temperature must be controlled.

Water-Assisted Cold Sintering of Alumina Ceramics in SPS Conditions

A developing energy-saving approach of cold sintering in a pure aqueous medium was applied to the preparation of α-Al2O3 ceramics and performed on spark plasma sintering equipment. The initial γ-Al(OH)3 and γ-AlOOH powders and the cold-sintered ceramics were studied by X-ray diffraction analysis, infrared spectroscopy, thermal analysis, and scanning electron microscopy to reveal the chemical and structural transformations they experienced during the cold sintering. At 450 °C and 70 MPa, initially γ-AlOOH transformed into a fragile α-Al2O3 material. Porous α-Al2O3 ceramics with about 60% porosity were obtained after cold sintering of γ-Al(OH)3 in the same conditions combined with subsequent annealing at 1250 °C for 3 h. The role of water molecules in the studied processes was considered as the enhancement of structural mobility in the cold-sintered material due to its reversible hydroxylation similar to earlier investigated supercritical water actions on the precursors during α-Al2O3 formation. Further improvement of the cold sintering setup and regimens would open prospects in α-Al2O3 ceramics manufacturing by an ecologically benign route.

Multiscale modelling of the thermoelastic properties of alumina-zirconia ceramics for 3D printing

Additive manufacturing appears to facilitate the accurate manufacturing of alumina-zirconia technical ceramics. Nevertheless, the fine tuning of the manufacturing of these components by 3D printing requires an analysis of the parameters that influence their final thermoelastic properties. In this context, this work presents the application of (finite element-based) numerical procedures that aim at the prediction of the effective thermoelastic properties of 3D-printed alumina-zirconia ceramics. The numerical modelling considers three different scales: micro-, meso- and macroscale. The microscale corresponds to the microstructural level of, sintered at 1500 °C, slip-casted samples with different compositions of alumina-zirconia. On the other hand, the macroscale corresponds to the macrostructural level of porous lattice of 3D-printed ceramics, being defined at the mesoscale level by a periodic unit cell. Thus, an initial microstructural analysis (at microscale level) provides the influence of the alumina/zirconia ratio on the (macroscopically homogeneous and isotropic) material thermoelastic properties, which together with the definition of the geometry of a periodic unit cell (at mesoscale level), provides, by a second analysis (at both the meso- and macroscale levels), the coupled influence of material and geometry of the macrostructural lattice on the structural (macroscopically heterogeneous and anisotropic) thermoelastic properties. Moreover, experimental thermoelastic properties of the sintered slip-casted specimens were obtained for several alumina/zirconia ratios and analysed together with microstructure patterns. Prediction of the microstructural effective thermoelastic properties was also made using micromechanics and composite theory (analytical) models. All the numerical, experimental and analytical results for the microstructural level are presented and compared. Numerical results for the meso- and macrostructural levels are also presented.

Wear behaviour of lithography ceramic manufactured dental zirconia

ObjectiveThe study aims to evaluate the wear surface using 3D surface roughness and other material characterization of zirconia fabricated using photopolymerization based Lithography-based Ceramic Manufacturing (LCM).MethodLCM technology was used to fabricate zirconia specimens of size 10 × 10 × 2mm3. Scanning Electron Microscope, 3D–profilometer, X-ray Diffraction, and hardness test characterized the samples before and after wear and Coefficient of friction (COF) was monitored.ResultThe COF was around 0.7 and did not differ much between the horizontally and vertically printed specimens. However, the surface roughness after wear for horizontally printed specimen was 0.567 ± 0.139 μm, while that for vertically printed specimen was 0.379 ± 0.080 μm. The reduced valley depth and the dale void volume were low for the vertically printed zirconia specimen, indicating lesser voids and low fluid retention. In addition, it was observed that the hardness value of the vertically printed sample was better. The scanning electron microscopic images and 3D surface profiles of the zirconia specimens depicted the surface topography and revealed the wear track.ConclusionThe study shows that zirconia fabricated using LCM technology possesses surface roughness of about 0.5 μm with no machining scars that are usually associated with CAD/CAM dentistry and also indicating agreement with clinically acceptable values for minimal surface roughness of dental restorations. Dental restorations using LCM fabricated zirconia redues the requirement of post-processing work flow that is part of CAD/CAM dentistry.

Enhanced mechanical properties of porcelain ceramic tile/Kevlar fabric composite with bio‐inspired shell‐like structure

AbstractCeramic materials with high strength, toughness, and excellent impact resistance are urgently required for many structural applications, but these mechanical properties are difficult to achieve in traditional ceramic tiles due to their inherent brittleness. Inspired by the specific structure of shells, the multilayered ceramic tile/Kevlar fabric composite with a bio‐inspired shell structure was successfully fabricated via a surface hydroxylation followed by simple hot press process. It is found that the composites have representative step‐like fracture behaviors rather than brittle fracture, which has been proven to possess a better ability of mechanical performance and noncatastrophic failure behavior compared to same‐thickness ceramic tile. Specifically, the bending strength, fracture toughness, and fracture work of the composite with a 15‐tier structure come to 836.5 ± 12.5 MPa, 14.6 ± .2 MPa·m1/2, and 7228.8 ± 108.4 J·m1/2, which are even better than those of reported advanced materials. Such fracture‐resistant behaviors are correspondent to the strengthening effects of the crack deflection, interfacial debonding, and fiber pull out, accompanied by bio‐inspired structure and appropriate bonding state between brittle or ductile layers. This resin or fabric content can be used as well as the slip systems to transfer the internal stress in time to consume more fracture energy per unit length and prevent risky brittle fracture, while carrying loads. We expect these findings to provide vital guidance for promoting the applications of traditional ceramics in bio‐inspired high‐performance composites for actual ceramic manufacturers.

Regularized Multi-Output Gaussian Convolution Process With Domain Adaptation.

Multi-output Gaussian process (MGP) has been attracting increasing attention as a transfer learning method to model multiple outputs. Despite its high flexibility and generality, MGP still faces two critical challenges when applied to transfer learning. The first one is negative transfer, which occurs when there exists no shared information among the outputs. The second challenge is the input domain inconsistency, which is commonly studied in transfer learning yet not explored in MGP. In this paper, we propose a regularized MGP modeling framework with domain adaptation to overcome these challenges. More specifically, a sparse covariance matrix of MGP is constructed using convolution process, where penalization terms are added to adaptively select the most informative outputs for knowledge transfer. To deal with the domain inconsistency, a domain adaptation method is proposed by marginalizing inconsistent features and expanding missing features to align the input domains among different outputs. Statistical properties of the proposed method are provided to guarantee the performance practically and asymptotically. The proposed framework outperforms state-of-the-art benchmarks in comprehensive simulation studies and one real case study of a ceramic manufacturing process. The results demonstrate the effectiveness of our method in dealing with both the negative transfer and the domain inconsistency.

Valorization of oil well drilling cuttings as a raw material in ceramic manufacturing

This study investigates the effect of clay replacement by oil well drilling cuttings (DC) in ceramic materials manufacturing. DC was added at 0, 15, 30 and 45 wt%. The raw materials were characterized by physical, chemical, and mineralogical analyses. Ceramic specimens were produced via uniaxial pressing and sintered at a constant heating rate (5 °C/min) for 90 min at three temperatures (750, 850, or 950 °C). Then, the samples were evaluated by linear firing shrinkage, apparent specific mass, water absorption, color, and flexural strength. Ceramic materials were analyzed by X-ray fluorescence spectrometry (XRF), thermogravimetric analysis (TG), Fourier transform infrared spectroscopy (FTIR), and X-ray diffractometry (XRD/Rietveld). Environmental risk assessment of ceramic products containing DC was investigated by leaching and solubilization tests. The results allow classifying the raw and the ceramic materials as non-hazardous and inert. Ceramics consisted mainly of quartz, illite, hematite, feldspar, primary mullite, and spinel. The sintering temperatures (from 750 up to 950 °C) and the increasing DC contents (up to 45%) directly affect the mechanical properties of the red ceramic, which are suitable to produce bricks, blocks and tiles. In the analyzed scenarios, the results indicated DC as an alternative raw material environmentally appropriate for the ceramic manufacturing.

Impact of the Xanthan Gum on Rheological and Mechanical Properties of Slip of Ceramic

The slips intended for the manufacture of ceramics must have rheological properties well-defined in order to bring together the qualities required for the casting step (good fluidity for feeding the molds easily settles while generating a regular settling of the dough and for the dehydration phase of the dough in the mold a setting time relatively short is required to have a sufficient refinement which allows demolding both easy and fast). Many additives have added in slip of ceramic in order to improve their rheological and mechanical properties. In this study, we investigated the impact of xanthan gum on rheological and mechanical properties of ceramic slip. The modified Cross model is used to fit the stationary flow curves of ceramic slip at different concentration of xanthan added. The addition of xanthan gum in a concentration range between 0 and 0.4 wt % in slip of ceramic induces the increase in the yield stress, zero shear rate viscosity and the infinite shear rate viscosity of the slip of ceramic. Generally speaking, the presence of xanthan gum modifies the rheological and mechanical properties of the slip. On the other hand, the study shows that an increase in flexural strength with the increase of the amount of xanthan gum in the ceramic slip. All the experimental results indicate an increasing tendency of the interactions between the particles of the raw materials with the highest concentration of xanthan gum.

3D printing of unsupported multi-scale and large-span ceramic via near-infrared assisted direct ink writing

In the three-dimensional printing process of ceramic with low-angle structures, additional supporting structures are usually employed to avoid collapse of overhanging parts. However, the extra supporting structures not only affect printing efficiency, but the problems caused by their removal are also a matter of concern. Herein, we present a ceramic printing method, which can realize printing of unsupported multi-scale and large-span ceramics through the combination of direct ink writing and near-infrared induced up-conversion particles-assisted photopolymerization. This printing technology enables in-situ curing of multi-scale filaments with diameters ranging from 410 µm to 3.50 mm, and ceramic structures of torsion spring, three-dimensional bending and cantilever beam were successfully constructed through unsupported printing. This method will bring more innovation to the unsupported 3D manufacturing of complex shape ceramics.