摘要
采用粉末冶金法制备含CeO_2的SiC_p/Al-Si复合材料,研究CeO_2的添加量对复合材料显微组织的影响,探讨CeO_2在烧结过程中对Si析出的作用机理。结果表明,添加CeO_2可以有效细化析出Si颗粒的平均尺寸,并提高析出Si颗粒的数量。CeO_2的最佳添加质量分数为0.6%,过高或过低的CeO_2含量会降低细化效果。CeO_2作为析出Si相的非均匀形核基底,提高了析出Si相的形核率,从而细化析出Si颗粒尺寸,提高了析出Si颗粒的数量。
SiC_p/Al-Si composite with CeO_2 addition was fabricated by powder metallurgy. The effect of CeO_2 content on microstructure of the composite was investigated. The effects of CeO_2 on the Si precipitation mechanism during sintering was also discussed. The results show that CeO_2 can effectively refine the average size of precipitated silicon and increase its quantity. The optimum mass percent of CeO_2 is 0.6%. Higher or lower CeO_2 content will reduce the refining effects. As the heterogeneous nucleation substrate of precipitated silicon,CeO_2 can improve the silicon nucleation rate,thus refine the precipitated silicon size and increase its precipitation quantity.
出处
《粉末冶金工业》
CAS
北大核心
2016年第1期32-35,共4页
Powder Metallurgy Industry
基金
国家自然科学基金资助项目(51371077)
关键词
粉末冶金
析出Si
烧结
稀土
powder metallurgy
precipitated silicon
sintering
rare earth
