Carbide Ceramics Research Articles

Enhanced properties of (TaNbTiV)C high‐entropy carbide ceramics through controlled structure and morphology of high‐entropy carbide powders

AbstractSubmicron high‐entropy carbide (HEC) (TaNbTiV)C powders with various morphologies and properties were prepared using the molten salt method by adjusting structures and graphitization of carbon sources. Subsequently, the HEC ceramics were sintered at 1900°C using spark plasma sintering. Compared to traditional carbon sources (carbon black and flake graphite), powders synthesized using graphitic carbon microspheres with a spherical shape exhibited a smaller particle size of 0.45 µm, a larger specific surface area of 14.46 m2/g, and a larger lattice constant of 0.4451 nm. Moreover, the HEC powders prepared using graphitic carbon microspheres enhanced the sintering of the HEC matrix, leading to improved mechanical properties and oxidation resistance of the HEC ceramics compared to those prepared using other carbon sources. Unlike the precursor method used to adjust the HEC powder structure, the molten salt method is a low‐cost and straightforward approach to regulating the HEC powder structure by controlling the structure of raw material.

Ablation behavior of medium entropy carbide ceramics with different molar ratios of (Hf, Zr, Ti)C in oxyacetylene flame

Ablation behavior of medium entropy carbide ceramics with different molar ratios of (Hf, Zr, Ti)C in oxyacetylene flame

Effect of Y2O3-RE2O3 (RE= Nd, Sm, Tb, Dy, Tm) -MgO additives on mechanical and thermal properties of silicon carbide ceramics

Effect of Y2O3-RE2O3 (RE= Nd, Sm, Tb, Dy, Tm) -MgO additives on mechanical and thermal properties of silicon carbide ceramics

Observation of superconductivity and ferromagnetism in high-entropy carbide ceramics

Observation of superconductivity and ferromagnetism in high-entropy carbide ceramics

Effect of sintering atmosphere on the electrical properties of aluminum and boron-added porous silicon carbide ceramics

Effect of sintering atmosphere on the electrical properties of aluminum and boron-added porous silicon carbide ceramics

Enhancement of Joint Properties in B4C/TC4 Connections by adding AlN to AgCuTi brazing materials

ABSTRACT In this study, the surface treatment of boron carbide ceramics was conducted, and an AgCuTi-AlN + AgCu foil composite brazing material system containing aluminum nitride (AlN) particles were employed to connect B4C ceramics and TC4. The addition of 3 wt% AlN improved the structure of the intermediate layer, providing more nucleation sites for solid solution, resulting in a more compact microstructure. However, with an increased AlN content of 6 wt%, the fluidity of the brazing material decreased, leading to a degradation of mechanical properties. When the AgCuTi-3wt%AlN + AgCu foil composite brazing material system was applied for the joining process at 850°C, the highest shear strength obtained was 68 MPa, representing a 70% increase compared to the non-additive condition.

Tribological properties of silicon carbide ceramic surfaces modified by polishing, grinding and laser radiation

In this work, we experimentally studied the influence of the texture of silicone carbide (SiC) ceramics formed by traditional (grinding and polishing) and promising (laser radiation) treatment methods on tribological properties (the friction coefficient and wear rate). Raman spectroscopy was used to study the phase composition. The friction and wear tests were conducted using the ball-on disk technique under unlubricated conditions. The friction coefficient was found to be significantly affected by the texture (roughness), which must be described by at least four three-dimensional roughness parameters. The higher the surface roughness of both mechanically- and laser-treated SiC, the higher the values of wear rate and friction coefficient are. Mechanical treatment forms a texture with a negatively asymmetric and flatted distribution of asperities. The shape and density of asperities on this texture affect the friction coefficient. A texture with a negatively asymmetric and peak shaped distribution of asperities is formed by laser radiation of SiC. The skewness and the density of asperities on this texture affect the friction coefficient.

Establishment of Symbiotic Structure with Metal Atomic-layer Phase-separation in Carbide Ceramics

Establishment of Symbiotic Structure with Metal Atomic-layer Phase-separation in Carbide Ceramics

Direct joining of pressureless solid-phase sintered silicon carbide ceramics

Direct joining of pressureless solid-phase sintered silicon carbide ceramics

Synergistically reinforced boron carbide ceramics by introduction of Fe and BN

AbstractBoron carbide (B4C)‐FeB ceramics and B4C‐FeB‐BN ceramics are prepared via hot pressing with B4C plus different contents of iron (Fe) and B4C plus 5 wt% Fe and different contents of boron nitride (BN), respectively. The phase composition, microstructure, and mechanical properties of the prepared ceramics are studied in detail. The synergistic effect of Fe and BN on hot‐pressed B4C ceramics is discussed. Results indicate that Fe can react with B4C to form FeB, and enhance the densification and mechanical property of B4C ceramics. 5 wt% Fe is the optimal addition amount. Fe and BN can synergistically reinforce B4C ceramics. The ceramics fabricated with B4C‐5 wt% Fe‐4 wt% BN have the optimal comprehensive performance, of which the relative density, hardness, flexural strength, and fracture toughness reach 98.5%, 32.74 GPa, 668.92 MPa, and 4.09 MPa·m1/2, respectively, higher than those of the ceramics fabricated with B4C or with B4C plus Fe. The liquid formed by Fe during sintering enhances the dispersion of BN, which is beneficial to realizing the function of pinning grain boundary and pulling out. The toughening phenomena include intergranular and transgranular fracture, particle pulling out, and bridging.

Tailoring porosity and pore size in silicon carbide ceramics with C/SiO2 additions

AbstractPorous silicon carbide ceramics are ideal candidates for filters, separation membranes, and high‐temperature structural materials, for which high porosity and precise pore size control are required. However, high porosity and large pore sizes usually lead to degradation in mechanical properties. In this work, silicon carbide powder with two different particle sizes was used as the raw material, and C powder and SiO2 powder were used as pore‐forming agents. A series of pure silicon carbide porous ceramics with micron‐sized pores were prepared by recrystallization sintering. The porosity and pore size of obtained samples were controllable and adjustable, and the mechanical properties were significantly enhanced. The microstructure, pore size distribution, porosity, and crystal phase of silicon carbide porous ceramics were characterized by scanning electron microscope, pore size analyzer, Archimedes method, and X‐ray diffraction. The effect of adding C/SiO2 on the porosity, the pore size, and the micro‐morphology of sintering samples was studied. The results show that C/SiO2 can adjust the porosity and pore size of pure silicon carbide porous ceramics in a wide range. The highest porosity of the obtained sample adding 40% C/SiO2 was up to 64.42%, and the average and maximum aperture are 5.42 and 11.98 µm, respectively.

Oxide-bonded silicon carbide and alumina ceramics obtained from template SCS powders

Oxide-bonded silicon carbide and alumina ceramics obtained from template SCS powders

Electrochemical Oxidation and Corrosion Behavior of 3D Printed Reaction-Bonded Silicon Carbide Ceramics in Eco-Friendly Electrolyte

Electrochemical Oxidation and Corrosion Behavior of 3D Printed Reaction-Bonded Silicon Carbide Ceramics in Eco-Friendly Electrolyte

Experiments and numerical simulations on ceramic-metal composite targets penetrated by a 7.62 mm armour-piercing projectile

Abstract In order to explore the protective performance of ceramic-metal fibre composite target plate, a lightweight composite target plate consisting of aramid cloth, silicon carbide ceramic, TC4 titanium alloy, and ultra-high molecular weight polyethylene fibre plate was designed. The effects of adhesive type, stacking sequence and delamination on the protective performance of the target plate were researched through the ballistic impact test on the protective target plate with 7.62mm armour-piercing bullets. The effect of thickness variation of ceramic metal on the protective properties of target plate was investigated by LS-DYNA finite element software. It was found that the bonding effect of silicon carbide ceramics with TC4 was better than that of AB adhesive when the silica gel was used as the bonding adhesive. When the ceramic metal thickness dimension is certain, the ceramic delamination will weaken the protective structure performance, and the performance of the metal plate as the back support of the ceramic layer is better than that of the ceramic covered before and after the metal layer. The energy efficiency of the ceramic-metal structure is optimal when the ratio of the thickness of silicon carbide ceramic to TC4 is 4.84:1 for a certain surface density.

Pressureless joining of SiC ceramic in oxidizing atmosphere using a SiC nanowires reinforced composite adhesive

Pressureless joining of SiC ceramic in oxidizing atmosphere using a SiC nanowires reinforced composite adhesive

Ultrafast pressure sintering: A one-step route to dense high-entropy carbide from precursors

Ultrafast pressure sintering: A one-step route to dense high-entropy carbide from precursors

The influence of metal element types on the formation mechanism and properties of high-entropy ceramic powders and coatings

The influence of metal element types on the formation mechanism and properties of high-entropy ceramic powders and coatings

Effect of phase composition on thermal and electrical conductivity of additive-free silicon carbide ceramics

Effect of phase composition on thermal and electrical conductivity of additive-free silicon carbide ceramics

A peridynamic model for oxidation and damage in zirconium carbide ceramics

A peridynamic model for oxidation and damage in zirconium carbide ceramics

A combined stereolithography and a pressureless sintering method to prepare SiC ceramics

A combined stereolithography and a pressureless sintering method to prepare SiC ceramics