新型硅酸盐自硬粘结剂砂性能的研究  

Research on Properties of New Silicate No-Bake Binder Sand

作　　者：章顺亮 殷亚军[1] 万鹏 肖惠康 李远才[1] 周建新[1] 程楠 马新彪 ZHANG Shun-iang;YIN Ya-jun;WAN Peng;XIAO Hui-kang;LI Yuan-cai;ZHOU Jian-xin;CHENGNan;MA Xin-biao(State Key Laboratory of Materials Processing and Die&Mould Technology,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China;School of Mechanical and Electrical Engineering,Wuhan Institute of Technology,Wuhan 430205,Hubei,China;Jinnaiyuan(Henan)Industrial Technology Co.,Ltd.,Zhengzhou 450001,Henan,China)

机构地区：[1]华中科技大学材料成形与模具技术全国重点实验室,湖北武汉430074 [2]武汉工程大学机电工程学院,湖北武汉430205 [3]金耐源(河南)工业科技有限公司,河南郑州450001

出　　处：《铸造》2024年第2期154-159,共6页Foundry

摘　　要：以有机酯为固化剂的普通水玻璃自硬砂具有生产环境好、产生的有害气体少的优势,目前广泛应用于铸钢件的生产。但以硅砂为原砂的水玻璃自硬砂用于生产结构复杂、质量要求高的铸铁件,与树脂砂工艺相比,还存在硬化速度慢,型芯砂强度较低,使用性能对环境湿度敏感等问题。为此,本文以一种新型硅酸盐粘结剂为对象,选用球形陶瓷砂,在固化剂自硬工艺基础上,添加促硬剂和多种粉末改性剂,重点研究了常温强度和高温残留强度的变化规律。正交试验获得的复合粉末改性剂优化配方为:陶瓷砂∶促硬剂∶氧化锆∶氮化硅=1000∶4∶2∶1,粘结剂加入量2.2%,固化剂占粘结剂质量的20%,试样1h强度为0.98MPa,24h强度1.59MPa,800℃残留强度0.62MPa,其常温强度已达到自硬树脂砂的性能指标。Ordinary ester cured sodium silicate sand has the advantage of good production environment and less harmful gas generation,and is currently widely used in the production of steel castings.However,the ester cured sodium silicate sand with foundry silica sand as the base sand is used to produce iron castings with complex structure and high quality requirements,and compared with the resin sand process,there are still problems such as slow hardening speed,low core sand strength,and sensitivity to environmental humidity in the use of performance.To address this issue,this study focused on a new silicate binder,employed spherical ceramic sand,and added hardening agents and various powder additives based on curing agent no-bake process,the change law of room temperature strength and high temperature residual strength was studied emphatically.The optimized formula of composite powder modifier obtained by orthogonal experiment was ceramic sand∶hardening agent∶zirconia∶silicon nitride=1000∶4∶2∶1,binder addition amount was 2.2%,curing agent accounted for 20%of the binder,the strength of the sample was 0.98 MPa for 1 h,the strength was 1.59 MPa for 24 h,and the residual strength at 800℃was 0.62 MPa,and its room temperature strength had reached the performance index of self-hardening resin sand.

关 键 词：硅酸盐粘结剂 球形陶瓷砂 粉末改性剂 常温强度 高温残留强度 

分 类 号：TG221[金属学及工艺—铸造]