铝合金精密铸造用硅灰石膏型材料制备与性能  

Preparation and Properties of Thaumasite Mould Composites for Aluminum Alloy Precision Casting

作　　者：唐骥 吴瑾[2] 刘志中 王涛 李笑 巩甘雷[2] 杨志刚 TANG Ji;WU Jin;LIU Zhi-zhong;WANG Tao;LI Xiao;GONG Gan-lei;YANG Zhi-gang(Shenyang Research Institute of Foundry Co.,Ltd.,Shenyang 110022,Liaoning,China;Hebei College of Industry and Technology,Shijiazhuang 050091,Hebei,China)

机构地区：[1]沈阳铸造研究所有限公司,辽宁沈阳110022 [2]河北工业职业技术学院,河北石家庄050091

出　　处：《铸造》2020年第8期849-852,共4页Foundry

基　　金：高端装备轻合金铸造技术国家重点实验室开放课题项目-铝合金精密铸造用石膏型材料研究2019。

摘　　要：研究了铝合金精密铸造用硅灰石膏型材料的制备技术及其悬浮体的性能。硅灰石膏型材料的悬浮体在100 s^-1剪切速率及300~400 mPa·s表观粘度范围内,可操作时间达到20 min以上,满足浇注工艺的要求。材料经浇注成形后加工成要求的形状,测得的最大初凝抗折强度为3.1 MPa,表面裂纹出现温度大于500℃,热膨胀在572℃时达到最大值。材料的物相由硅灰石膏、镁橄榄石和滑石组成。试验表明材料满足铝合金精密铸造的性能要求。The preparation technology and suspension properties of thaumasite mould composites used in aluminum alloy precision casting were investigated. The working time of the suspension of the thaumasite mould composites was more than 20 minutes within the bulk viscosity of 300-400 mPa·s under the shear rate of 100 s-1, which meets the requirements of the casting process. After the thaumasite mould composites were cast and machined to the required shape, the testing results show that the maximal initial setting flexural strength could reach 3.1 MPa, the surface crack initiation temperature was more than 500 ℃, and the thermal expansion reached the maximum at 572 ℃. The phases present in the composites are thaumasite, forsterite and talc. The application test shows that the composites are satisfactory for the alloy precision casting process.

关 键 词：硅灰石膏型材料 水固比 伴生矿物 混合集料 

分 类 号：TG221[金属学及工艺—铸造]