摘要
选用 ＳｉＣ作为骨料，长石和粘土组成的陶瓷结合剂和活性Ｃ作为成孔剂，对不同的烧成温度下ＳｉＣ多孔陶瓷的气孔率和强度进行了研究。温度的提高使ＳｉＣ多孔陶瓷的显气孔率降低，而体气孔率增大；气孔形状随陶瓷结合剂的高温性能变化而变化，１２８０℃烧成时的气孔形状多为圆形，尺寸分布较均匀；１２４０℃烧成时出现强度极大值，温度提高使固体气孔率增大而强度降低，但在大于１３００℃时，由于ＳｉＣ的高温氧化产物参与晶界相反应，局部界面结合强度大大提高，使ＳｉＣ多孔陶瓷瓷体强度异常增大。
SiC powder as the backbone together with the ceramic binder comsposed of felspar mixed with clay and pore-forming carbon were chosen, several firing temperatures were experimented, and some porosities and strengthes of the porous SiC ceramics were analysed. The higher the firing temperature, the lower the bending strength as well as the lower the apparent porosity whereas the higher the body porosity in the porous SiC ceramics. The Appearance of pores were determined by the high-temperature features of the binder. The pores tend to be spherical and more homogeneous at 1280℃. Due to the oxidation of SiC above 1300℃ and that the oxided products will react with the boundary constituents, the local boundary strength was increased, which accounts for the abnormal increase of the strength of the porous SiC ceramics.
出处
《金刚石与磨料磨具工程》
CAS
2000年第4期38-40,共3页
Diamond & Abrasives Engineering
基金
本项目受清华大学新型陶瓷与精细工艺国家重点实验室开发基金资助!(X.GZ9910)
河南省模具
材料工程及装备重点实验室基金资
