硅酸铝纤维对氧化硅陶瓷型芯性能的影响  

Effect of Aluminum Silicate Fibers on Properties of Silica Ceramic Core

作　　者：杨建 玄伟东 周宇豪 刘泳鸿 张强 何忠书 王保军 李霞 任兴孚 任忠鸣 YANG Jian;XUAN Wei-dong;ZHOU Yu-hao;LIU Yong-hong;ZHANG Qiang;HE Zhong-shu;WANGBao-jun;LI Xia;REN Xing-fu;REN Zhong-ming(Department of Material Science and Engineering,State Key Laboratory of Advanced Special Steels,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学材料科学与工程学院,省部共建高品质特殊钢冶金与制备国家重点实验室,上海200444

出　　处：《铸造》2023年第3期294-300,共7页Foundry

基　　金：国家自然科学基金项目(52274386,92060104);上海市科委项目(20511107700);中国重燃项目(F095)。

摘　　要：以石英玻璃粉为原料,添加不同含量的硅酸铝纤维,通过热压注成形法制备出不同硅酸铝纤维含量的氧化硅陶瓷型芯试样,探究了不同硅酸铝纤维含量对氧化硅陶瓷型芯析晶和性能的影响规律。结果说明:随着硅酸铝纤维含量的增加,型芯试样的收缩率逐渐减小,气孔率逐渐增大,方石英含量逐渐增多,而体积密度基本不变;试样的室温和高温抗弯强度随着纤维含量的增加先增大后减小,高温挠度逐渐减小。当硅酸铝纤维含量为3wt.%时,型芯的综合性能最佳,收缩率为1.0%、气孔率为29.23%、体积密度为1.62 g/cm3、室温抗弯强度为23.36 MPa、高温抗弯强度为31.39 MPa以及高温挠度为0.69 mm。综上所述,硅酸铝纤维的加入不仅显著降低了氧化硅陶瓷型芯的收缩,还有效改善了其室温、高温抗弯强度以及高温抗蠕变性能。Silica ceramic core samples with different contents of aluminum silicate fibers were prepared by hot-pressing injection method with quartz glass powder as raw material.The effect of the aluminum silicate fibers with different contents on crystallization and properties of the silica ceramic cores was investigated.The results showed that with the increase of the aluminum silicate fibers content,the shrinkage rate of the core sample gradually decreased,the porosity gradually increased,the content of cristobalite gradually increased,but the volume density was basically unchanged.The flexural strength at room temperature and high temperature increased first and then decreased with the increase of the fibers content,and the high-temperature deflection decreased gradually.When the content of the aluminum silicate fibers was 3 wt.%,the core had the best comprehensive performance,with a shrinkage rate of 1.0%,porosity of 29.23%,volume density of 1.62 g/cm3,bending strength of 23.36 MPa at room temperature,bending strength of 31.39 MPa at high temperature,and high-temperature deflection of 0.69 mm.In conclusion,the addition of the aluminum silicate fiber not only significantly reduced the shrinkage of the silica ceramic core,but also effectively improved its room temperature bending strength,high temperature bending strength and high temperature creep resistance.

关 键 词：陶瓷型芯 硅酸铝纤维 抗弯强度 方石英含量 

分 类 号：TG221[金属学及工艺—铸造]