Addition Of Silicon Carbide Research Articles

Fluoride doped SiC/Si3N4 composite as a high thermal conductive material with enhanced mechanical properties

Abstract Silicon nitride (Si 3 N 4 ) based composites have been extensively studied and widely used in industrial applications. Herein, SiC/Si 3 N 4 composites were prepared through hot press sintering at 1700 °C under nitrogen (N 2 ) atmosphere. Fluoride additives (AlF 3 and MgF 2 ) were used to reduce lattice oxygen content, which can affect the bulk density and a source to increase the porosity of the composite. Experimental results revealed that the chemical compatibility between silicon carbide (SiC) and Si 3 N 4 matrix under high temperature sintering could be effectively improved by integrating SiC/Si 3 N 4 ceramics interphase. The X-ray diffraction (XRD) and scanning electron microscopy (SEM) results indicate that a complete transformation of α to β-Si 3 N 4 and intergranular behavior of material occurred, which revealed that the phase transformation was unaffected by the addition of SiC. Furthermore, the enhanced crystallization degree and a strong interfacial effect of the SiC/Si 3 N 4 composites enabled to obtain a significant increase in thermal conductivity (90.67–145.66 W/mK), fracture toughness (8.52–10.3 MPa m 0.5 ) and Vickers hardness (1849–2125 HV).

Preparation and properties of porous mullite ceramics with high-closed porosity and high strength from fly ash via reaction synthesis process

Fly ash is a typical industrial solid waste that seriously affects human health and ecological balance. In order to recycle the fly ash, in this work, porous mullite ceramics were successfully fabricated with fly ash and bauxite via reaction synthesis process. Effects of firing temperature (1450–1550 °C), silicon carbide addition amount (0–15 wt%), and potash feldspar addition amount (0–16 wt%) on the mullite porous ceramics were systematically investigated. It was found that increasing the silicon carbide addition amount or raising firing temperature was favourable for improving the cold compressive strength and thermal shock resistance of the porous ceramics. Consequently, the porous ceramics with 10 wt% silicon carbide, 4–12 wt% potash feldspar had optimal overall performances. The closed porosity and cold compressive strength ranges were 14.79%–18.57% and 217.18–236.67 MPa, respectively. The thermal cycles were 7–9 times, and the thermal conductivity was reached to 2.19–2.52 W m−1 K−1 at 800 °C. This work provides a convenient and promising method for the utilization of fly ash.

In Vitro Activity Assays of Sputtered HAp Coatings with SiC Addition in Various Simulated Biological Fluids

Considering the requirements of medical implantable devices, it is pointed out that biomaterials should play a more sophisticated, longer-term role in the customization and optimization of the material–tissue interface in order to ensure the best long-term clinical outcomes. The aim of this contribution was to assess the performance of silicon carbide–hydroxyapatite in various simulated biological fluids (Dulbecco’s modified Eagle’s medium (DMEM), simulated body fluid (SBF), and phosphate buffer solution (PBS)) through immersion assays for 21 days at 37 ± 0.5 °C and to evaluate the electrochemical behavior. The coatings were prepared on Ti6Al4V alloy substrates by magnetron sputtering method using two cathodes made of hydroxyapatite and silicon carbide (SiC). After immersion assays the coating’s surface was analyzed in terms of morphology, chemical and phase composition, and chemical bonds. According to the electrochemical behavior in the media investigated at 37 ± 0.5 °C, SiC addition inhibits the dissolution of the hydroxyapatite in DMEM acellular media. Furthermore, after adding SiC, the slow degradation of hydroxyapatite in PBS and SBF media as well as biomineralization in DMEM were observed.

Characterization and mechanical response of novel Al-(Mg–TiFe–SiC) metal matrix composites developed by stir casting technique

This study was conducted to investigate the synthesis, characterization and mechanical properties of aluminium reinforced with ferrotitanium and silicon carbide via stir casting technique. Microstructures of as-cast samples were analysed using optical and scanning electron microscopes equipped with energy-dispersive X-ray spectroscopy. The mechanical properties in terms of hardness, tensile, tribological behaviour and fracture were assessed. Results showed that the homogeneous dispersion of reinforcement was within the metal matrix composite. Tribological study revealed a decrease in frictional coefficient of the composites with lowest frictional coefficient observed in composite with addition of silicon carbide as reinforcement. Morphology of fractured surface displayed a reduction in the size of dimples formed in reinforced aluminium composites when compared with larger dimple sizes observed in as-cast aluminium alloy.

SiC contents and pin temperature effect on tribological properties of Al25Zn/SiC composites

In this investigations, an effect of silicon carbide addition on dry sliding wear behavior of Al25Zn/SiC composites was studied at different temperature, load and sliding speed for a sliding distance of 1400 m using a pin on disc tribometer with EN24 shaft steel disc as per Taguchi L16 orthogonal array. Under equal test situation, highest wear resistance, hardness, tensile strength and lowest coefficient of friction were observed for the composite with 15 wt% of SiC. The pin temperature is identified as the most influencing factor for the wear and friction characteristics of the composites. Regression model and Artificial Neural network model developed were found capable of predicting wear behavior of the composite. The mechanism of wear observed is adhesion, abrasion and delamination.

Strengthening of Al-4.5%Cu alloy with the addition of Silicon Carbide and Bamboo Leaf Ash

PurposeThe purpose of this paper is to determine the use of BLA along with SiC as economical reinforcements to enhance the mechanical behavior of hybrid composite. The purpose of this research is the development of cost-effective aluminum hybrid metal matrix composites.Design/methodology/approachThe present research work investigation evaluated the mechanical properties of Al-4.5%Cu alloy, Al-4.5Cu/10SiC, Al-4.5Cu/10SiC/2BLA and Al-4.5Cu/10SiC/4BLA composites by the Stir casting method. The fabricated composites were analyzed using optical microscopy (OM), scanning electron microscopy (SEM), and hardness and tensile test.FindingsThe microstructure modification with the addition of reinforcement particles in the matrix alloy and clear interface in between matrix and particles are observed. The density of the composite increased with the addition of SiC and decreased with the addition of BLA in comparison with that of matrix alloy. The hardness and tensile strength of the single-reinforced composite and hybrid composites improved with the addition of reinforcement particles. The strengthening of composites was due to load-bearing capacity of reinforcement particles over the matrix alloy and increased dislocation density of composites materials. The tensile failure mechanism of the composites is reveled with SEM analysis.Practical implicationsThe papers reports the development of cost-effective and light weight aluminum hybrid composites with remarkable enhancement in the mechanical and tribological properties with the addition of BLA as economical reinforcement along with SiC.Originality/valueThe density, hardness and tensile values of fabricated aluminium composites were presented in this paper for the use in the engineering applications where the weight and cost are consider as a primary factors.

Study of weathering effect on the thermal conductivity of polyvinyl chloride before and after silicon carbide addition as packaging materials

The work was carried out in two stages. The first stage concernedwith study of silicon carbide (SiC) ratio (1.5, 2.5, 3.5, and 4.5 wt%)effect on the Thermal conductivity of polyvinyl chloride (PVC); andthe second stage concerned with the UV – weatherizing (25, 50, and75 hr), thermal aging (40, 50, and 60 °C), and rain- weatherizing (1,2.5, and 4 hr) effect on the samples involved. Thermal conductivityresults proved that there was slight increase in thermal conductivityby (SiC) loading; it increased from 0.17 W/m.K for PVC to 0.19W/m.K for 4.5% SiC/PVC; where as it was systematically decreasedby UV- weatherizing, thermal aging, and rain- weatherizing. Thisproperty is in a good agreement with general characteristics ofpackaging materials as warm or cold food packaging.

The Effect of SiC Addition on AlNi Compact Mechanical Properties Produced Via Powder Metallurgy

This research directed to produce Al-Ni alloys by powder metallurgy technique since of its marketable and industrial significant. Nickel and aluminum powders were determined their particle size then the powders mixed and blended with percent (Al - 20% Ni). Silicon carbide particles (SiC) powder supplemented to master alloy powder by percent (4-6- and 8 wt. %) separately then these powders mixed to obtain homogeneous distribution, then the powders compacted in cold pressure at 700 MPa. The sintering procedure was performed at (530°C) for 8 hrs. At vacuum atmosphere (10-4 torr). After cooling these samples grinded and polished to estimate microstructure, density, porosity, LOM, SEM, EDS, X-ray diffraction ,hardness and wear tests at dissimilar circumstances. Results showed that the hardness increased by (52%) and wear rate decreased by (55%) at 8 wt % silicon carbide addition, and it was the best results.

Effect of silicon carbide addition on the microstructure, hardness and densification properties of spark plasma sintered Ni-Zn-Al alloy

Effect of silicon carbide (SiC) additions on the physico-chemical properties of nickel-zinc-aluminium (Ni-Zn-Al) alloy prepared by spark plasma sintering technique is investigated. Elemental powder matrix samples were prepared with different amounts of SiC (1–4 wt%) and were mixed in a tubular mixer for 5 h at 49 rpm. The metal-ceramic composite powders were pressed and sintered at 850 °C with 100 °C/min heating rates, 10 min holding time and a pressure of 50 MPa. Hard disk-shaped metal matrix composite pellets (ᴓ = 40 mm, thickness = 5 mm) were obtained. Chemical, physical and microstructural properties of sintered composite samples were studied. The results show that SiC addition particles influence the physical and microstructural characteristics metal matrix composites. The samples demonstrated significant increase in relative density (83–96.53%) and hardness (132–228.36 HV) with increase in SiC additions. Compositional analysis indicated predominant nickel and silicon carbide in identified phases.

Characteristics Of Aluminium ADC 12/SiC Composite with the Addition of TiB and Sr Modifier

The addition of silicon carbide (SiC) as a reinforce in a composite can improve mechanical properties. In this study aluminium ADC 12 (Al-Si-Aluminium Alloy) is treated with an addition of SiC varied from (1; 1.5; 2; 2.5 to 3) vf% and mixed with 0.18 wt% Sr to change the morphology of the silicone eutectic phase and 0.15 wt% titanium boron (TiB) was added as a grain refiner as well as the addition of 5 wt% magnesium (Mg) to increase the wettability. All materials were fabricated by stir cast method. This research is conducted to obtain the candidate material for application in train's brake shoe and bearing. This kind of usage requires high mechanical properties such as wear resistance, thermal resistance, good elastic modulus and lightweight. The composites were characterised by both mechanical properties and microstructure. The result shows that there is an increase in the mechanical properties of aluminium ADC 12 /SiC composite compared to unreinforced with the value of 144 MPa of strength, 53 HRB of hardness, and 0.0049 mm3 m–1 of wear rate. As a result, the higher addition of the SiC results in the better mechanical properties for the composite.

Effect of Silicon Carbide (SiC) Nanoparticles on the Spectroscopic Properties and Performance of PMMA/PC Polymer Blend

Films of polymethyl methacrylate (PMMA)/polycarbonate (PC) polymer blend doped silicon carbide (SiC) nanopowder are synthesized by the casting method. The study for the structural, optical and electrical behavior of PMMA/PC blend without and with low contents (≤0.8 wt%) of SiC is done. The change of the structure is investigated from X-ray spectra. After the addition of SiC, the intensity of the main X-ray halo peak at 2θ = 20.26° of PMMA/PC is decreased, attributed to an interaction between PMMA/PC. It’s clear that SiC is causing an increase in the amorphous regions inside the PMMA/PC blend. The peaks related to SiC are not found attributed using a small amount of SiC with complete dissolution of SiC. The shift of the intensity for IR bands has supported an interaction between all components. The values of the optical band gap from UV-Vis spectra using indirect transition are decreased with the increase of SiC. The values of the electrical conductivity are low at low frequency attributed to the charge accumulation at the electrode which takes place. The conductivity is increased as the increase of frequency due to the mobility of charge carriers. Furthermore, the conductivity is increased with the increase of SiC contents. The values of ε' and ε'' are very high at the lower frequency and they decrease when the frequency is increased attributed to the effect. The plot of both Z' and Z'' shows dramatic decrease with the increase of frequency.

Получение и свойства электроискровых покрытий из гранул Ti3Al с добавками карбидов кремния и бора

Получение и свойства электроискровых покрытий из гранул Ti3Al с добавками карбидов кремния и бора

Fracture analysis of hard-alloy tungsten-cobalt plates with ultrafine powder additives

The article presents a fracture surface analysis of hard-alloy tungsten-cobalt plates of a group WC8 with ultrafine additives in impact-abrasive wear. When testing on impact-abrasive wear, a wearing surface repeatedly hits the abrasive layer. Magnesium spinel powders (MgAl2O4) are used as ultrafine additives, and for comparison, silicon carbide (SiC) additives are considered. A percentage of additives is varied in composition test specimens. The geometric parameters of test specimens without additives and with ultrafine additives are the same. This analysis of fracture surface contributes to a risk prediction of studied material premature destruction and failure. The insertion of ultrafine additives of magnesium spinel and silicon carbide into tungsten-cobalt alloys supports to reduce the WC grain size and increase the hardness values of the samples than the sample without additives. Based on the macroanalysis of the fracture surface of the specimens it is identified that the character of fracture are depending on the composition of the material. Prevailing wear type is a chipping WC particles. In the studied specimens with the additives of magnesium spinel (MgAl2O4) and silicon carbide (SiC), areas with small elements of ductile fracture are detected. A change of the fracture character is detected when ultrafine additives are added to the composition of tungsten-cobalt alloys: the fracture of the specimen without additives is brittle, but the fracture of specimens with the ultrafine powder additives of magnesium spinel and silicon carbide is intergranular, quasi-brittle.

On the Hybrid Effects of Alumina, Silicon Carbide, and Carbon Ultrafine Additives, Used in the Optimization of Sintered MMCs Properties

This paper describes the changes of structure and properties of MMCs, based on FeGr1 material impregnated with the machine oil and with alumina, silicon carbide, and carbon ultrafine additives. The hybrid effects of these additives were investigated using the Simplex Lattice Design as one of DoE methods. With the addition of alumina and silicon carbide, the ferrite content increases significantly in comparison with the base material. Depending on the content and composition of the additives, MMC hardness may be reduced by up to 42% or increased by up to 20%, while residual porosity increases by up to 10–35% in comparison with the base material; sample shrinkages are between −0.9% up to −2.55%. When impregnating with oil, its content depends on the residual porosity and is equal to 1.1–2.2% of the MMC sample mass. The content of additives is determined, thus ensuring optimal values in the parameters investigated.

Influence of Non-Metallic Particles Addition on Wettability, Intermetallic Compound Formation and Microhardness of Sn-0.7Cu Lead Free Solder Paste

A non metallic reinforcement has attracted most of the worldwide researchers to enhance solder performance. Silicon carbide (SiC) particle is a semiconductor which had been used as a non metallic reinforcement in this research study.The fabrication of Sn-0.7Cu lead free solder paste was done by mixing the solder powder with flux. Then, Sn-0.7Cu/SiC composite solder paste was prepared by mixing solder powder, flux and various weight percentage (wt%) of SiC. The amount of SiC particles added was 0, 0.25, 0.50, 0.75 and 1.0 wt%. The influence of SiC addition was analyzed based on its wettability, IMC layer formation and microhardness properties. The addition of SiC particles had decreased the contact angle as well as thinner the IMC layer. The morphology of IMC layer changed from scallop like shape to combination of scallop and planar like shape with the addition of SiC particle. Apart from that, the microhardness was enhanced with addition of SiC particle into Sn-0.7Cu lead free solder paste.

Enhancement of Microstructural and Physical Properties of Sn-0.7Cu Lead-Free Solder with the Addition of SiC Particles

Nowadays, composite solder has gained researcher’s attention due to its promising improvement in physical and mechanical properties for lead-free solder. To improve the properties of Sn-0.7Cu (SnCu): the promising lead-free candidate, addition of silicon carbide (SiC) as a reinforcement was used into this study. However, its limitation on solderability as compared with SnAgCu (SAC) make it not an attractive alternative lead-free solder. This study was carried out to investigate the effect of SiC particle on microstructure evolution and physical properties of SnCu based solder alloys. SnCu-SiC composite solders were synthesized by powder metallurgy method (PM), which consists of several processes such as mechanical blending, compaction and sintering. Five different weight percentages of SiC particle; 0.00, 0.25, 0.50, 0.75 and 1.00 were mechanically blended with SnCu lead-free solder. The result shows that the addition of SiC particle has decreased the β-Sn area and refined the microstructure of composite solder. In addition, the improvement in microhardness of composite was achieved.

High temperature oxidation behavior of silicon carbide-carbon coated nanostructured ferritic alloy composites in air + water vapor environment

Oxidation behavior of silicon carbide (SiC) - carbon coated nanostructured ferritic alloy (C@NFA) composites was investigated in an air + 45 vol% H2O atmosphere at 500–1000 °C. All the composites show an oxidation structure with an outer Fe-rich layer and an inner Cr-rich layer, as well as internal oxidation along grain boundaries. Oxidation resistance increases with SiC addition. The corresponding fundamental mechanism is proposed. The improved oxidation resistance for the higher SiC content composites is attributed to a delay in ‘breakaway oxidation’ due to improved kinetics for the formation of dense Cr2O3 and SiO2 protective layers.

Synergy effect of ultrafine tungsten, silicon carbides, and graphite microadditives on the Fe-based MMCs properties using the simplex lattice design

This paper is focused on the analysis of the changes in the structure and properties of metal matrix composites (MMCs) based on iron (Fe) material with tungsten carbide (WC), silicon carbide (SiC) and graphite microadditives. The synergy effect of the content of different carbides and graphite on MMCs properties was investigated using the simplex lattice design method. It was found that with the addition of carbides, namely WC and SiC, the ferrite content increases from 5 to 8% in the base material to 45% and 70% respectively. Depending on the percentage and the composition of reinforcing particulates MMCs hardness may decrease up to 25% or increase up to 30% in comparison with the base material. The residual porosity changes slightly, no more than 10%, even with an increased content of carbides and graphite, and relative volume changes of samples are between −2 to +1%.

Mechanical properties evaluation of T800 carbon fiber reinforced hybrid composite embedded with silicon carbide microparticles

PurposeThe purpose of this paper is to study the effect of the addition of silicon carbide (SiC) microparticles and their contributions regarding the tensile and shear properties of the T800 fiber reinforced polymer composite at various fiber volume fractions. The tensile and shear properties of the hybrid composites where continuous T800 fibers are used as reinforcements in an epoxy matrix embedded with SiC microparticles have been studied.Design/methodology/approachThe results were obtained by implementing a micromechanics approach assuming a uniform distribution of reinforcements and considering one unit cell from the whole array. Using the two-step homogenization process, the properties of the materials were determined by using the finite element analysis (FEA). The predicted elastic properties from FEA were compared with the analytical results. The analytical models were implemented in the MATLAB Software. The FEA was performed in ANSYS APDL.FindingsThe mechanical properties of the hybrid composite had increased when compared with the properties of the conventional FRP. The results suggest that SiC particles are a good reinforcement for enhancing the transverse and shear properties of the considered fiber reinforced epoxy composite. The microparticle embedment has significant effect on the transverse tensile properties as well as in-plane and out-of-plane shear properties.Research limitations/implicationsThis is significant because improving the properties of the composite materials using different methods is of high interest in the materials community. Using this study people can work on the process of including different type of microparticles in to their composite designs and improve their performance characteristics. The major influence of the particles can be seen only at lower volume fractions of the fiber in the composite. Only FEA and analytical methods were used for the study.Practical implicationsMaterial property improvements lead to more advanced designs for aerospace and defense structures, which allow for high performance under unpredictable conditions.Originality/valueThis type of study proves that the embedment of different microparticles is a method that can be used for improving the properties of the composite materials. The improvement of the transverse and shear properties will be useful especially in the design of shell structures in the different engineering applications.

Effect of silicon carbide particles on the mechanical and plastic properties of the AlMg6/10% SiC metal matrix composite

This work deals with studying the effect of reinforcing SiC particles on the mechanical and plastic properties of a metal matrix composite with a matrix of aluminum alloy AlMg6 (the 1560 aluminum alloy according to the Russian State Standard GOST 4784−97). We assess this effect using the results of mechanical tests at the microscale and macroscale levels. The paper analyzes the fracture mechanism at the microlevel under tensile and compressive stress conditions, as well as the type of contact between the composite constituents. The experimental results obtained for the metal matrix composite are compared with analogous experimental data for the AlMg6 alloy and a compacted material made from the AlMg6 alloy (a compacted powder without addition of SiC reinforcing particles). The studied compacted materials were not previously subjected to extrusion. The tests show a decisive influence of the reinforcing particles on the plastic and mechanical properties of the AlMg6/10% SiC metal matrix composite under compression and tension. For example, the addition of silicon carbide increased the initial yield stress of the compacted material by 26% under tensile tests, and the percentage elongation after fracture was increased up to 1.1%, while it amounted to 0.02% for the compacted material without addition of silicon carbide. Under compression, on the contrary, the addition of silicon carbide degraded plastic properties. As a result, the percentage compression before cracking was 28.4% and 57.9% for the compacted materials with and without addition of silicon carbide, respectively.