以稀土氧化物Lu2O3作为单一添加剂,研究了稀土氧化物的添加量对氮化硅在相变过程密度、力学性能的影响规律.指出了氮化硅粉体的α→β相变率与稀土氧化物的添加量、粉体的热处理温度之间的关系.研究表明:加入Lu2O3添加剂后,β-Si3N4相的比率随着温度的升高呈明显上升趋势,当热处理温度达到1750℃时,β-Si3N4相的比率几乎接近或达到100％.随着Lu2O3含量的增加,在烧结过程中所形成的液相量随之增多,相对密度随之提高.随Lu2O3添加量的增加,试样的抗弯强度也增大,在10％时达到峰值,抗弯强度为1259.90MPa;氮化硅陶瓷的硬度随Lu2O3添加量的变化规律与抗弯强度的变化规律相似.Lu2O3含量在10％时,试样的断裂韧性值达到最大,为6.277MPa·m1/2.
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