材料科学
烧结
等轴晶
抗弯强度
碳化硅
再结晶(地质)
微观结构
陶瓷
晶粒生长
粒径
粒度
多孔性
复合材料
冶金
化学工程
古生物学
工程类
生物
作者
Zhiliang Huang,Wenyue Sun,Chengchong Wang,Changlian Chen,Jisheng Huang,Song Chen,Pu Hu
摘要
Abstract Pure silicon carbide (SiC) ceramics were prepared through recrystallization sintering by using two types of SiC powder, with different particle sizes, as the raw materials. The effects of the fine powder content on the bulk density, porosity, flexural strength, and grain morphology were investigated. In the synthesis process, silicon nitride (Si 3 N 4 ) was used as the sintering additive that decomposed and transformed into SiC to promote the growth of SiC grains. The added fine powder was exploited in the evaporation and condensation process and grain amalgamation caused by the movement of the grain boundaries. Thus, a dissimilar fine powder content modulated the microstructure and mechanical strength of the SiC ceramics. The results indicate that the bulk density and flexural strength increase to a maximum of 2.12 g/cm 3 , 44.2 MPa, respectively, when the fine powder content is 40 wt.%. Three kinds of grain morphologies, that is, uniform equiaxed grains, round, equiaxed grains, and hexagonal platelet grains, and the maximum average pore size (3.62 μm) are obtained when the fine powder content is between 0 wt.% and 60 wt.%. In addition, the main crystal phase 6H‐SiC is partially converted to 4H‐SiC when the fine powder content is up to 60 wt.%.
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