羧甲基纤维素钠对铸造用硅砂表面处理的研究  

Research on Surface Treatment of Silica Sand Used for Foundry with Carboxymethylcellulose Sodium

作　　者：叶利[1] 冀运东[1] 钟飞升 李家波 

机构地区：[1]武汉理工大学材料科学与工程学院,湖北武汉430070 [2]彰武联信金莹铸造材料有限公司,辽宁阜新123200

出　　处：《热加工工艺》2017年第5期97-100,103,共5页Hot Working Technology

摘　　要：采用羧甲基纤维素钠溶液(CMC-Na)对铸造用硅砂表面进行预处理,在硅砂表面覆盖一层有机薄膜,研究了CMC-Na处理液浓度、加入量、硅砂的预热温度等对表面处理效果的影响。通过型砂强度、发气量测定等方法研究了改性硅砂性能的变化。结果表明:硅砂预热温度为100℃时,采用2%浓度的CMC-Na处理液与硅砂以质量比为1.75:100进行混砂90~100s,表面处理效果最佳。采用气硬冷芯盒法制芯时,如果树脂粘结剂的加入量相同,则改性硅砂的砂芯强度比未改性的提高近30%;在满足生产用的砂芯强度要求下,改性硅砂的树脂加入量可降低20%,型砂的发气量从10.3 mL/g下降到8.2 mL/g。The surface of foundry silica sand was pretreated by using carboxymethylcellulose sodium and a layer of organic film was coated on the silica sand surface. The influence of the concentration and the addition of CMC-Na solution, preheating temperature of silica sand on the surface treatment was studied. The properties of modified silica sand were studied by the test of strength, gas evolution of foundry sand. The results show that the best treatment parameters are sand preheating temperature of 100 ℃, a mass ratio of 1.75：100 between 2% concentration of CMC solution and silica sand, and mulling time for 90-100 s. When the core is made by using the gas hardened cold box method, the strength of modified foundry sand increases by nearly 30% than that of unmodified under the same resin addition amount. When it meets the production requirements of the sand core strength, the resin addition amount in modified silica sand reduces by 20%, and the gas evolution of foundry sand decreases from 10.3 mL/g to 8.2 mL/g.

关 键 词：硅砂 冷芯盒法 羧甲基纤维素钠 表面处理 

分 类 号：TG222[金属学及工艺—铸造]