Oxide‐bonded porous SiC ceramic filter supports were prepared using SiC powder (d₅₀ = 212 µm), Al₂O₃, and clay as bond forming additives and graphite as pore former following reaction bonding of powder compacts at 1400°C in air. Reaction bonding characteristics, phase composition, porosity, pore size, mechanical strength, and microstructure of porous SiC ceramic supports were investigated. Mullite bond phase formation kinetics was studied following the Johnson–Mehl–Avrami–Kolmogorov (JMAK) model using non‐isothermal differential thermal analysis (DTA) data. Compared to porous SiC ceramic filter supports having no needle‐like mullite bond phase, materials processed by the mullite bonding technique exhibited higher average strength (22.1%) and elastic modulus (5.4%) at a similar porosity level of ~38%, with upper and lower bounds of their strength, modulus, and porosity being 39.1 MPa, 40.2 GPa, and 36.3% and 34.2 MPa, 31.3 GPa, and 33.0%, respectively. Spray coating method was applied for preparation of oxidation‐bonded SiC filtration layer having thickness of ~150 µm and pore size of ~5–20 µm over the porous SiC support compacts using aqueous slurry made of fine SiC powder (d₅₀ = 15 µm) followed by sintering. The layered ceramics thus prepared are potential materials for gas filter applications.

中文翻译：

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层状氧化物结合的多孔SiC陶瓷滤料的加工研究

使用SiC粉（d ₅₀  = 212 µm），Al ₂ O ₃制备氧化物结合的多孔SiC陶瓷滤器支架。粉末在1400°C的空气中反应结合后，粘土作为结合形成添加剂，石墨作为成孔剂。研究了多孔SiC陶瓷载体的反应结合特性，相组成，孔隙率，孔径，机械强度和微观结构。莫来石键合相形成动力学的研究采用了非等温差热分析（​​DTA）数据，并根据Johnson-Mehl-Avrami-Kolmogorov（JMAK）模型进行了研究。与没有针状莫来石键合相的多孔SiC陶瓷过滤器支架相比，通过莫来石键合技术处理的材料在〜38％的相似孔隙度水平下显示出更高的平均强度（22.1％）和弹性模量（5.4％），且更高其强度，模量和孔隙率的下限分别为39.1 MPa，40.2 GPa和36.3％和34.2 MPa，31.3 GPa和33.0％，分别。喷涂法是使用由细SiC粉末制成的水性浆料在多孔SiC载体压块上制备厚度约150μm，孔径约5-20μm的氧化结合SiC过滤层（d ₅₀  = 15 µm），然后进行烧结。如此制备的层状陶瓷是用于气体过滤器应用的潜在材料。