辅料对磷酸盐粘结剂覆膜砂性能的影响  

Influence of Auxiliary Materials on Performance of Phosphate Bonded DryPrecoated Sand

作　　者：唐文卓 张友寿[1] 夏露[1] TANG Wen-zhuo;ZHANG You-shou;XIA Lu(School of Materials and Chemical Engineering,Hubei University of Technology,Wuhan 430068,Hubei,China)

机构地区：[1]湖北工业大学绿色轻工材料湖北省重点实验室,湖北武汉430068

出　　处：《铸造》2021年第6期712-716,共5页Foundry

摘　　要：研究了水合物、有机弱酸、偶联剂等辅料对磷酸盐粘结剂覆膜砂成形过程砂样固化时间及砂样抗拉强度,存放稳定性等的影响,得出相关变化曲线。结果表明,添加2.5%自合成磷酸盐粘结剂、3%的水合硫酸铝、0.2%的柠檬酸和0.4%的偶联剂制备的覆膜砂,通过射砂成形,砂样固化时间2 min,抗拉强度可达1.6 MPa以上,且具有良好的存放稳定性。通过SEM显微观察及傅里叶红外分析,初步探讨了辅料的作用机理。This paper presents the results of a study on the effects of hydrates,weak organic acids,coupling agents and other auxiliary materials on the curing time,tensile strength and storage stability of the phosphate bonded precoated sand samples.In this study,the relevant change curves were obtained.The results show that the precoated sand prepared by adding 2.5%phosphate as binder,3%aluminum sulfate hydrate,0.2%citric acid and 0.4%coupling agent can be cured in 2 minutes and its tensile strength can reach more than 1.6 MPa by shot sand molding.The phosphate bonded precoated sand samples have good storage stability.The SEM microscopic observation and FTIR analysis were also carried out to preliminarily explore the action mechanism of the auxiliary materials.

关 键 词：磷酸盐 覆膜砂 辅料 抗拉强度 固化时间 

分 类 号：TG221[金属学及工艺—铸造]