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Reaction injection molding of silicon nitride ceramics having crystallized grain boundary phases
Reaction injection molding of silicon nitride ceramics having crystallized grain boundary phases
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机译:具有结晶晶界相的氮化硅陶瓷的反应注射成型
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摘要
A sintered, Si3N4-containing ceramic article is prepared by a reaction injection molding process comprising (1) injecting into a heated mold a fluid, nondilatant mixture of (a) at least 40% by volume of a powder mixture of (i) Si3N4, (ii) a silicate glass-forming sintering aid and (iii) a high metal content silicide, and (b) a curable Si3N4 precursor binder, to cure the binder and produce a hardened molded article, (2) heating the hardened molded article under a suitable atmosphere to convert the cured binder to a Si3N4-containing ceramic, and (3) sintering the molded article under a vacuum to crystallize the silicate glass phase by deoxygenation.
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机译:烧结的含Si 3 N 4的陶瓷制品是通过反应注射成型工艺制备的,该工艺包括:(1)向加热的模具中注入(a)至少40%(体积)(i)Si3N4粉末混合物的液体非膨胀混合物, (ii)形成硅酸盐玻璃的烧结助剂和(iii)高金属含量的硅化物,和(b)可固化的Si 3 N 4前体粘合剂,以固化该粘合剂并生产硬化的模制品,(2)在在合适的气氛下将固化的粘合剂转变为含Si 3 N 4的陶瓷,以及(3)在真空下烧结模制品,以通过脱氧使硅酸盐玻璃相结晶。
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