【摘要】 由β－Ｓｉ３Ｎ４粉末通过一定的工艺条件得到致密的氨化硅陶瓷，试样的显微结构为短柱状和等轴状颗粒交织排列而成的均匀结构．材料的烧结过程分为重排、晶形转变、晶粒生长三个阶段，随烧结时间增加，烧结试样的显微结构开始阶段变化很明显，２ｈ后结构比较稳定．温度升高有利于柱状颗粒长径比的提高，添加剂量的增加使显微结构粗化．更多还原

【Abstract】 Dense silicon nitride ceramics were obtained from β-Si₃N₄ powder, the material wascomposed of small rodlike grains and equiaxed grains, the small rodlike grains dispersed uniformlyin the matrix. Sintering process consisted of three stages: rearrangement, grain shape regulate,grain growth. The microstructure was sensitive to the time at the beginning of sintering, andshowed stable when holding time was longer than 2h. High temperature increased the aspect ratioof rodlike grains. More additives increased the diameter of both equiaxed and rodlike grains.更多还原