在自增韧Si3N4陶瓷的烧结过程中,添加作为晶种的长柱状β-Si3N4单晶体对于改善陶瓷的强度和韧性是非常有效的。本研究旨在制备出长柱状β-Si3N4单晶体,并对其尺寸和形貌进行有效的控制。通过对87.3wt%α-Si3N4+8.3wt%Y2O3+4.4wt%SiO2体系进行气压烧结,经去除掉玻璃相等漂洗工艺后,制得β-Si3N4单晶体,其直径为1~2μm、长度为4~6μm。同时对不同烧结工艺下制得的β-Si3N4单晶体的尺寸和工艺参数的关系进行了研究。
The use of β-Si3N4 particles,as a seed material,is very effective for development of self-reinforcing microstructure and fracture toughness in silicon nitride ceramics. This work is to produce rod-like β-Si3N4 single crystal particles with a controlled morphology and size. β-Si3N4 Particles with a diameter of 1~2μm and length of 4~6μm are obtained by GPS sintering a mixture of 87.3wt%β-Si3N4+8.3wt%Y2O3+4.4wt%SiO2, followed by acid rinse treatments to remove residual glassy phase. The relation of morphology and size of β-Si3N4 single crystal under different sintering are studied
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