砂型铸造水基自干涂料的工艺特性  

Process Characteristics of Water-based Self-curing Coatings for Sand Casting

作　　者：冯胜山[1,2] 卞青青 黄东 谢树忠 刘春晶 詹春毅 陈建丽[1,2] 吴维锋 梁家豪 高运华 FENG Shengshan;BIAN Qingqing;HUANG Dong;XIE Shuzhong;LIU Chunjing;ZHAN Chunyi;CHEN Jianli;WU Weifeng;LIANG Jiahao;GAO Yunhua(Guangdong Cadre Institute of Science and Technology,Zhuhai 519090,China;Zhuhai Key Laboratory of Advanced Equipment Manufacturing and Material Processing Technology,Zhuhai 519090,China;Guangdong Zhuli Casting Materials Technology Co.,Ltd.,Zhuhai 519180,China;Guangdong Molding Material Engineering Technology Center,Zhuhai 519180,China)

机构地区：[1]广东省科技干部学院,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：《热加工工艺》2022年第21期61-64,共4页Hot Working Technology

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)项目(2016B090918094)。

摘　　要：分析了砂型铸造水基自干涂料的流变特性和发气特性,研究了涂层厚度和分次施涂对涂料自干固化速度的影响规律。结果表明:新型水基自干涂料兼有触变性流体和假塑性流体特征,触变率适中,涂刷指数较高,涂刷性好,流平性和抗流淌性的综合平衡性优良,可以同时满足各种施涂方法的流变性要求;水基自干涂层自干速度随涂层厚度的降低呈近似线性提高,厚涂层最好在保证其表面质量的前提下尽量一次性施涂;新型水基自干涂料发气量与普通水基烘干型涂料相当,但是发气速度几乎比后者慢1倍,为消除铸件气孔缺陷提供了良好条件。The rheological and gas evolution characteristics of water-based self-curing coatings for sand casting were analyzed and the influence of coating thickness and graded coating on the self-curing rate of coating was studied. The results show that the new water-based self-curing coating has both the characteristics of thixotropic fluid and pseudoplastic fluid,which has moderate thixotropy rate and high brushing index, good brushability and excellent comprehensive balance of flow-leveling and anti-flowability. It can meet the rheological requirements of various coating methods. The self-curing speed of the water-based self-curing coating increases in an approximately linear manner with the decrease of its thickness. Thick coating should be best to paint at one time in the premise of ensuring its surface quality. The gas evolution volume of the new water-based self-curing coating is approximately equal to that of ordinary water-based baking coatings, but the gas evolution speed of self-curing coatings is almost half as that of the latter, which provides good conditions for preventing gas hole defect of castings.

关 键 词：砂型铸造 水基自干涂料 工艺特性 

分 类 号：TG221[金属学及工艺—铸造]