复合纤维含量对精铸硅溶胶型壳强度及透气性的影响

发布时间：2018-03-23 05:24

  本文选题：熔模精铸　切入点：硅溶胶型壳　出处：《中国有色金属学报》2015年11期 　论文类型：期刊论文

【摘要】：采用陶瓷和尼龙复合纤维增强熔模精铸硅溶胶型壳,通过测试与分析复合纤维增强硅溶胶型壳的常温及焙烧后强度和透气性,研究复合纤维含量对硅溶胶型壳强度和透气性的影响规律,确定复合纤维含量与焙烧温度和型壳强度的关系,并通过SEM对型壳试样断口形貌进行观察和分析。结果表明:复合纤维对硅溶胶型壳强度和透气性的影响显著,当复合纤维含量小于0.6%(质量分数)时,硅溶胶型壳强度和透气性同时增大;当复合纤维含量大于0.6%时,型壳常温及焙烧后强度开始减小,焙烧后基体中孔隙率增加,型壳透气性继续增大;当复合纤维含量为0.6%、焙烧温度为1050℃时,型壳焙烧后强度达到最大值。
[Abstract]:Ceramic and nylon composite fiber reinforced investment casting silica sol shell was used. The strength and permeability of composite fiber reinforced silica sol shell at room temperature, roasting and air permeability were tested and analyzed. The influence of composite fiber content on the strength and permeability of silica sol shell was studied, and the relationship between composite fiber content and calcination temperature and shell strength was determined. The fracture morphology of the shell specimen was observed and analyzed by SEM. The results show that the composite fiber has a significant effect on the strength and permeability of the silica sol shell, and when the content of the composite fiber is less than 0.6 (mass fraction), The strength and permeability of silica sol shell increase at the same time, when the content of composite fiber is greater than 0.6, the strength of shell decreases at room temperature and after calcination, and the porosity in matrix increases and the permeability of shell increases after calcination. When the composite fiber content is 0.6 and the calcination temperature is 1050 鈩，

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