Effect of calcination process on the properties and microstructure of SiC preform and corresponding SiCp/Al composites synthesis by pressureless infiltration
Effect of calcination process on the properties and microstructure of SiC preform and corresponding SiCp/Al composites synthesis by pressureless infiltration
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DOI：
10.1016/j.msea.2006.08.056
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发表时间：
2007-01
期刊：
影响因子：
6.4
通讯作者：
S. Ren;Xin-Bo He;X. Qu;I. S. Humail;Yan Li
中科院分区：
文献类型：
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作者：
S. Ren;Xin-Bo He;X. Qu;I. S. Humail;Yan Li
研究了焙烧时间和温度对陶瓷注射成型SiC预制体及无压熔渗制备的SiCp/Al复合材料性能和微观结构的影响。研究发现SiC表面生成的SiO2层的交换键合是闭孔的来源，并强化了预制件。温度对预制件开孔率（POPR）和强度的影响大于煅烧时间，因为氧化层中氧的扩散是由温度控制的，而不是由时间控制的。铝通过界面反应破坏了SiO2在渗透过程中的障碍，渗透到闭孔中，使复合材料的孔隙率低于相应预制件的闭孔率。较好的焙烧条件为1100℃真空8h，此时预成型体的抗压强度约为0.4MPa，相应复合材料的孔隙率低于0.3%，而预成型体的闭孔率高达2.6%。
The influence of calcination time and temperature on the property and microstructures of the SiC preform prepared by ceramic injection molding and corresponding SiCp/Al composites by pressureless infiltration was investigated. It was found that the commutative bonding of generated SiO2layer on the surface of the SiC was the source of obturated pores and strengthened the preform. The effect of the temperature on the open porosity ratio (POPR) and strength of the preform was more than that of calcination time because the diffusion of oxygen in the oxide layer was controlled by the temperature, not by the time. The aluminum could destroy the obstacle of SiO2during the infiltration by the interface reaction and infiltrated the obturated pores so that the porosity of the composite was lower than the obturated porosity of the corresponding preform. A better calcination condition was found to be at 1100°C for 8h in vacuum at which the compressive strength of the preform was about 0.4MPa and the porosity of the corresponding composites was below 0.3% though the obturated porosity ratio of the preform was as high as 2.6%.