整形石英砂在树脂砂中的应用  

Application of Shaped Quartz Sand to Precoated Sand

作　　者：钟飞升 张雅丹 常成 张希兴 李家波 冀运东[2] ZHONG Fei-sheng;ZHANG Ya-dan;CHANG Cheng;ZHANG Xi-xing;LI Jia-bo;JI Yun-dong(Zhangwu Lian Xin Foundry Material Co.,Ltd.,Fuxin 123200,Liaoning,China;School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,Hubei,China)

机构地区：[1]彰武县联信铸造硅砂有限公司,辽宁阜新123200 [2]武汉理工大学材料科学与工程学院,湖北武汉430070

出　　处：《铸造》2021年第4期465-468,共4页Foundry

摘　　要：SiO2含量≥97%的石英矿石破碎筛分后是非常理想的铸造用原砂,但破碎过程中砂产生很多尖角、粉尘,导致其砂芯强度低,堆积不密实,容易造成粘砂和断芯等缺陷。通过对石英砂进行整形处理,减少了砂表面的尖角和粉尘含量。结果表明:经过整形2次处理的石英砂与未处理的相比,角型系数从1.46降低至1.3,堆积密度提高10.27%。应用在覆膜砂中常温抗折强度比未整形的石英砂提高了73.41%,常温抗拉强度提高了24.44%,热态抗拉强度提高了14.78%,“8”字块砂芯总重量提高了7.82%,可以应用在铸钢件生产上。应用在冷芯工艺中初始强度和24 h终强度分别提高了30.49%和43.69%,具有很好的应用前景。Quartz ore with more than 97%SiO2 is an ideal raw sand for casting after crushing and screening.However,many sharp corners and dust are produced in the process of crushing,which leads to low strength of sand core,loose accumulation and easy to cause burning-on and core breaking.The dust content in the sand and sharp corners could be reduced by the surface treatment of quartz sand.Compared with untreated quartz sand,the angle coefficient of quartz sand with twice surface shaping treatment was reduced from 1.46 to 1.3,and the bulk density was increased by 10.27%,.The flexural strength at room temperature was increased by 73.41%,the tensile strength at room temperature was increased by 24.44%,the tensile strength at hot state was increased by 14.78%,and the total weight of sand core of"8"block was increased by 7.82%.Therefore,the treated quartz sand can be used in the production of steel castings.In the cold core process,the initial strength and 24 h final strength were increased by 30.49%and 43.69%,respectively.These results demonstrate that the shaped quartz sand has a good application prospect.

关 键 词：石英砂 整形处理 堆积密度 角型系数 

分 类 号：TG221[金属学及工艺—铸造]