In Situ Analysis of the Liquid Phase Sintering Process of alpha-SiC Ceramics
In Situ Analysis of the Liquid Phase Sintering Process of alpha-SiC Ceramics
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DOI：
10.15541/jim20150461
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发表时间：
2016
影响因子：
1.7
通讯作者：
Liang Hanqin;Yao Xiu-min;Huang Zheng-ren;Zeng Yuping
中科院分区：
文献类型：
--
作者：
Liang Hanqin;Yao Xiu-min;Huang Zheng-ren;Zeng Yuping
采用现场测量仪结合常规方法研究了添加Al_2O_3和Y_2O_3的液相烧结碳化硅陶瓷的致密化过程。在高温原位观察炉中观察了样品的收缩曲线、形貌和液相形成过程的模拟。通过对烧结温度为1640℃~1920℃，间隔为40℃的样品的分析，表征了材料的相对密度、抗弯强度和显微组织的演变。在1640~1680℃之间，确定了液态开始起作用的明显温度。验证了经典的液相烧结理论。在1880℃下烧结，可获得致密度为(99.46±0.37)%、抗折强度为(650±26)Mpa的高致密化碳化硅陶瓷。
The densification process of liquid phase sintered SiC ceramics with Al2O3 and Y2O3 as sintering additives was investigated by in situ measurement apparatus combined with conventional methods. The shrinkage curve, mor- phology of the sample and liquid phase formation process simulation were observed by high temperature in-situ ob- servation furnace. The relative density, flexural strength and microstructure evolution were characterized by analysis of samples sintered at temperatures ranging from 1640℃ to 1920℃ at 40℃ interval. The obvious temperature that liquid phase began to function was confirmed between 1640℃ to 1680℃. The classical liquid phase sintering theory was testified. Highly-densified SiC ceramics were obtained by being sintered at 1880℃, of which the relative density was (99.46 ± 0.37)%, and the flexural strength was (650 ± 26) MPa.