含水金属盐化合物对覆膜砂强度及抗吸湿性影响  

Effects of Metal Salt Aquo-compound on Strength and Humidity Resistance of Coated Sand

作　　者：罗圆圆 夏露 张友寿 夏增权 胡汉基 Luo Yuanyuan;Xia Lu;Zhang Youshou;Xia Zengquan;Hu Hanji(School of Materials and Chemical Engineering,Hubei University of Technology;Hubei Provincial Key Laboratory of Green Light Industrial Materials)

机构地区：[1]湖北工业大学材料与化学工程学院,武汉430068 [2]绿色轻工材料湖北省重点实验室

出　　处：《特种铸造及有色合金》2023年第9期1287-1291,共5页Special Casting & Nonferrous Alloys

摘　　要：含水金属盐化合物是制备磷酸盐干态覆膜砂的关键原材料之一。采用射芯机制样加热固化成型,研究了含水金属盐化合物的种类及其加入量对干态覆膜砂试样的抗拉强度和抗吸湿性的影响。结果表明,同时使用九水合柠檬酸镁和二水合磷酸二氢钠两种含水金属盐化合物,覆膜砂试样具有较高的即时强度和较好的抗吸湿性。试样的即时抗拉强度可达1.72 MPa,在相对湿度为50%~60%的恒温恒湿箱中放置12 h后试样抗拉强度降幅在25%以内。Metal salt aquo-compound is one of the key raw material for preparing phosphate dry coated sand.Dry coated sand was curing heated by core shooting machine,and effects of type and addition of metal salt aquo-compound on tensile strength and humidity resistance of specimens were investigated.The results indicate that the coated sand exhibits higher instant strength and humidity resistance by synergy of trimagnesiumdicitrate nonahydrate and sodium dihydrogen phosphate dihydrate.The instant tensile strength can reach 1.72 MPa,which is reduced by less than 25%after storage in the constant temperature oven with relative humidity of 50%~60%RH for12h.

关 键 词：含水金属盐化合物 磷酸盐 干态覆膜砂 抗吸湿性 

分 类 号：TG242.1[金属学及工艺—铸造]