摘要
研究了焙烧后的石膏型在高温激热时的裂纹情况,并基于石膏铸粉和焙烧曲线对精密铸造石膏型抗热震性性能进行了分析。结果表明,缩短石膏的焙烧时间,尤其是提高石膏及填料晶型转变时的加热和保温温度,会增加试样在激热情况下产生裂纹的倾向性。降低石膏的含量,会部分降低石膏型的强度。增加铝矾土含量,可以增加石膏型整体的耐火度,增加玻纤和硅溶胶等能增加石膏型的强度,且能阻止裂纹进一步扩大。降低石英的含量,可以提高石膏型在1 100℃时的抗热震性。
The thermal shock resistant property of gypsum mould is important to gypsum mould casting process. The present thesis introduces cracks of the gypsum mould after baked and analyze the thermal shock resistant property of gypsum mould based on the gypsum cast powder and baking curve. The results show that decrease baking time especially the time at which the crystalline transformation taking place will increase the tendency in crack of sample under thermal shock. The strength of the mold drops down some what with the decrease of gypsum content. The heat resistant of mold increases with increasing the additions of alumina clay. Additions of glass fiber and colloidal silica make gypsum mould stronger to resist crack extending, decrease SiO2 addition reduces the resistant ability to crack at 1 100 ℃.
出处
《铸造技术》
CAS
北大核心
2010年第4期471-473,共3页
Foundry Technology
关键词
石膏型
精密铸造
抗热震性
石膏铸粉
焙烧曲线
Gypsum mould
Slip cast
Thermal shock resistant
Gypsum cast powder
Baking curve
