摘要
以碱性酚醛树脂为粘结剂,采用吹CO_(2+)粉状促硬剂复合硬化工艺制型(芯),以抗拉强度为考核指标,通过正交试验优化促硬剂各组分的比例。研究结果表明:促硬剂各组分最优配比为Ca(OH)_2:水泥:水=4:4:0.5,在树脂加入量为3.0%,促硬剂加入量(占砂)为0.85%,CO_2吹气时间为60 s时,砂芯的即时抗拉强度为0.43 MPa,4 h抗拉强度为1.0 MPa,24h抗拉强度为1.61 MPa,发气量为20 mL/g,800℃高温残留强度为0,型砂的可使用时间大于2 h,溃散性良好,能够满足铸造生产要求。
By using blowing CO2+powder hardening accelerator composite hardening process and using alkaline phenol forma-ldehyde resin as binder to make molds(cores)and with tensile strength as assessment index,by using orthogonal test to optimize the ratio of hardening accelerator components.The results of investigation showed:the optimal ratio of hardening accelerator components was as Ca(OH)2:cement:water=4:4:0.5.When the resin addition was of 3.0%,the hardening accelerator addition was of 0.85%sand amount,blowing time was of 60 s,the immediate tensile strength of core was of 0.43 MPa,4 h tensile strength was of 1.0 MPa,24 h tensile strength was of 1.61 MPa,gas evolution was of 20 mL/g,the residual strength at 800℃was of 0,the bench life of molding sand was>2 h,collapsibility was good,could meet foundry production requirements.
作者
杨天安
刘伟华
李英民
宋来
张楠
YANG Tian-an;LIU Wei-hua;LI Ying-min;SONG Lai;ZHANG Nan(School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,China)
出处
《现代铸铁》
CAS
2018年第5期28-31,共4页
Modern Cast Iron
关键词
酚醛树脂
CO2硬化
粉状促硬剂
phenol formaldehyde resin
CO2 hardening
powder hardening accelerator
