微米级及亚微米级SiC细粉对新型SiC耐火材料烧结性能的影响

Effects of micron and submicron Si C powders on sintering properties of new type Si C refractories

采用SiC微米级及亚微米级细粉作为基质制备直接结合的新型SiC耐火材料,分别研究不同粒径的细粉配比对2 100℃无压烧结后试样的体积密度、显气孔率和线性收缩等性能的影响。试验结果表明:在2 100℃烧结后,随着微米级及亚微米级SiC细粉量的增加,线性收缩率也在增加;基质部分为单纯亚微米级SiC细粉时,试样烧结活性要优于基质为微米级SiC细粉试样,以及基质为微米级-亚微米级SiC混合细粉试样。

Micron and submicron SiC powders were used as matrix for preparation of new type direct bond SiC refractories. The effects of different particle size distribution on the bulk density apparent porosity and linear shrinkage of pressureless sintered samples at 2 100 ℃ were investigated. The experimental results show that after sintering at 2100 ℃,the linear shrinkage increases with the increase of SiC powder. When the matrix is pure submicron SiC powder,the sintering activity of the sample is better than that of the sample with micron SiC powder and the sample with micronsubmicron mixed SiC powder.