硅灰石膏型材料的流变行为及其性能  

Rheological Behavior and Properties of Thaumasite Mold Composites

作　　者：刘志中 唐骥 巩甘雷[2] 张国成 王涛 李笑 吴瑾[2] 胡大川 LIU Zhi-zhong;TANG Ji;GONG Gan-lei;ZHANG Guo-cheng;WANG Tao;LI Xiao;WU Jin;HU Da-chuan(Shenyang Research Institute of Foundry Co.,Ltd.,Shenyang110022,Liaoning,China;Hebei College of Industry and Technology,Shijazhuang 050091,Hebei,China;Air Force Military Representatives Office in Liaoyang,Liaoyang 110094,Liaoning,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 [3]空装驻辽阳地区军事代表室,辽宁辽阳110094

出　　处：《铸造》2020年第10期1077-1080,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：水固比0.45的硅灰石膏型材料悬浮体在10〜180s^-1范围内显示剪切变稀的流变特征,满足浇注成形的要求。建立的悬浮体流变模型η=40480(γ+77.01)^-1与试验值吻合,其流变行为符合幂律模型的特征。随着悬浮体的可操作时间从10 min增加到50 min时,在98 s^-1剪切速率下的表观粘度从248 mPa·s增大到441 mPa·s,呈线性缓慢增长,仍保持着假塑性流体特征,其稳定性能够满足浇注工艺的要求。材料浇注后的抗折强度为2.1 MPa,具有均匀一致的显微结构。使用试验表明,材料满足铝合金精密铸造的性能要求。The thaumasite mold composite suspension with a water-solid ratio of 0.45 exhibited shear thinning characteristic in a range of shear rate from 10 s-1 to 180 s-1, which is satisfactory for the casting process. Rheological model of the suspension, as shown by: η=40480(γ+77.01)-1, has been simulated using the MatLab software, revealing that the suspension characteristics agree with the power-law rheological model. With increasing the working time of suspensions from 10 min to 50 min,the bulk viscosity increased from 248 mPa·s to 441 mPa·s at 98 s-1 shear rate, showing slow linear growth, and pseudo plastic fluid characteristics were still maintained, with a satisfactory stability for the casting process. Furthermore, the composite has a more uniform microstructure and a flexural strength of 2.1 MPa. The application testing shows that the properties of the composite can meet the requirements of the aluminum alloy precision casting process.

关 键 词：硅灰石膏型材料 流变模型 表观粘度 可操作时间 悬浮体稳定性 

分 类 号：TG249.5[机械工程—精密仪器及机械]