耐火骨料粒度和粒形对水基自干铸造涂料自干时间的影响  

Effect of Refractory Particle Size and Shape on Self-Curing Time of WaterBased Self-Curing Casting Coatings

作　　者：詹春毅[1,2] 冯胜山 谢树忠[3,4] 刘春晶 黄东 吴维锋 梁家豪[3,4] 高运华 陈建丽[1,2] 卞青青 ZHAN Chun-yi;FENG Sheng-shan;XIE Shu-zhong;LIU Chun-jing;HUANG Dong;WU Wei-feng;LIANG Jia-hao;GAO Yun-hua;CHEN Jian-li;BIAN Qing-qing(Guangdong Cadre Institute of Science and Technology,Zhuhai 519090,Guangdong,China;Zhuhai Key Laboratory of Advanced Equipment Manufacturing and Material Processing Technology,Zhuhai 519090,Guangdong,China;Guangdong Zhuli Casting Materials Technology Co.,Ltd.,Zhuhai 519080,Guangdong,China;Guangdong Molding Material Engineering Technology Center,Zhuhai 519180,Guangdong,China)

机构地区：[1]广东科学技术职业学院,广东珠海519090 [2]珠海市先进装备制造与材料成型技术重点实验室,广东珠海519090 [3]广东省铸力铸材科技有限公司,广东珠海519180 [4]广东省造型材料工程技术中心,广东珠海519180

出　　处：《铸造》2023年第1期11-16,共6页Foundry

基　　金：广东省科技发展专项资金(协同创新与平台环境建设方向)产学研合作项目(2016B090919094);广东省教育厅特色创新项目(2021KTSCX219)。

摘　　要：简述了砂型铸造水基自干涂料的自干固化机理,利用非等径球堆积原理分析并通过试验验证了涂料含水量与涂层自干固化时间的相互关系,通过对比试验研究了涂料耐火骨料粒度分布和颗粒形貌对涂层自干时间的影响规律及其原因。结果表明:涂料含水率与涂层自干时间呈近似线性变化关系;耐火骨料的粒度分布对涂层自干时间的影响显著,而粒径大小的影响很小;耐火骨料粒度取平均粒径为200~325目的正态分布为宜;耐火骨料的颗粒形貌也显著影响涂层自干时间,采用粒形为类似球形的粉石英制备的涂料含水率低,涂层自干固化快;厚度为0.5 mm的涂层在相对湿度为80%±2%的环境条件下,在100 min内能实现自干固化,有望满足华南地区高湿气候条件下的树脂砂铸造生产要求。The self-curing mechanism of water-base self-curing sand-casting coating was described. The relationship between the moisture content and the self-curing time of the coating was analyzed on the basis of the principle of non-isometric ball stacking and verified experimentally. The influence law and cause of the sizedistribution and morphology of refractory-aggregate particle on self-curing time of the coating were studied based on experiments. The results showed that the moisture content of the coating had an approximate linear relationship with the self-curing time of the coating;the particle-size distribution of refractory-aggregate had a significant effect on the self-curing time, while the particle size had little effect;the particle size of the refractory aggregate should be normally distributed with an average particle size of 200 mesh to 325 mesh;the particle morphology of the refractory aggregate also significantly affected self-curing time of the coating, the coating prepared by the powder quartz whose grain shape is similar to the spherical shape had a low moisture content and the coating can cure quickly;the coating with a thickness of 0.5 mm can achieve self-curing within 100 minutes under an environmental condition of a relative humidity of 80%±2%, which basically meets the production requirements of resin sand casting under high humidity climate conditions in South China.

关 键 词：水基 自干涂料 自干时间 骨料粒度分布 颗粒形貌 

分 类 号：TG221[金属学及工艺—铸造]