SiCP含量对β-SiAlON/SiC纳米复相陶瓷的影响

摘要

In order to study the roles and effects of SiC particles on β-SiAlON/SiC nanocomposite ceramic. β-SiAlON/SiC nanocomposite ceramic was fabricated by cold isolated pressing and pressureless sintering, using β-Si3N4, Al2O3 and AlN as matrix powder, doping SiC particles as second phase, adding Y2O3 as sintering aid. Phase composition was studied by XRD, microstructure was detected by SEM, and element composition was analyzed by EDS. The results show that: samples have high density and low weight loss rate when the SiCP content is 5wt.%. With the increase of SiCP content, the radial and axial shrinkage of samples trends to decrease gradually; the z value change ofβ-SiAlON phase ranges from 1 to 4, which increases gradually; the elongated grain diameter decreases gradually.%为了研究SiC颗粒对β-SiAlON/SiC纳米复相陶瓷的作用及影响，以β-Si3N4，Al2O3及AlN作为形成β-SiAlON相的主要原料，以SiC颗粒为第二相，加入Y2O3作为烧结助剂，采用冷等静压成型及无压烧结工艺制备了β-SiAlON/SiC纳米复相陶瓷。利用XRD分析试样相组成，用SEM观察试样显微组织形貌，用EDS分析试样的元素组成。结果表明：SiCP含量为5wt.%时，试样具有较高的密度及较低的失重率。随着SiCP含量的增加，试样的径向收缩率和轴向收缩率均呈逐渐下降趋势；β-SiAlON相的z值从1变化至4，且逐步提高；β-SiAlON柱状晶的直径逐渐下降。