摘要
将制备碳化硅泡沫陶瓷的浆料通过烘干、制粉、干压成型、烧结来探讨烧结温度对制品性能的影响。试验结果表明样品的最高抗弯强度出现在1400℃、保温 2h的工艺条件下,而不是更高的烧结温度 1450℃。主要原因在于过高的烧结温度导致碳化硅氧化严重,生成了大量的方石英,方石英在随后的冷却过程中出现微裂纹所致。而碳化硅泡沫陶瓷的烧结机理主要是玻璃相对碳化硅颗粒的包覆、连接作用和新相莫来石的生成。
Slurry for SiC foam ceramics was dried, powdered, pressed and sintered in order to investigate the effect of sintering temperature to sample strength. The experimental result showed that the max flexural strength was not obtained at 1450℃ but 1400℃. The reason was that more crislobalite was created due to severe oxidation of SiC at high temperature, and cristobalite create microcrack during cooling progress. Sintering mechanism for SiC foam ceramics is SiC particles were wrapped, connected by glass phase and creation of mullite phase.
出处
《陶瓷科学与艺术》
CAS
2003年第5期28-30,共3页
Ceramics Science & Art
基金
863计划资助项目
