石英玻璃粉含量对氧化镁基陶瓷型芯性能的影响  

Effect of Fused Silica Powder Content on the Properties of MgO-Based Ceramic Core

作　　者：贺康兴 姜卫国 毛萍莉[1] HE Kang-xing;JIANG Wei-guo;MAO Ping-li(School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,Liaoning,China;School of Intelligent Manufacturing,Weifang University of Science and Technology,Shouguang 262700,Shandong,China)

机构地区：[1]沈阳工业大学材料科学与工程学院,辽宁沈阳110870 [2]潍坊科技学院智能制造学院,山东寿光262700

出　　处：《铸造》2024年第5期668-676,共9页Foundry

基　　金：山东省自然科学基金项目(ZR2022ME066)。

摘　　要：利用X射线衍射、扫描电子显微镜及能谱仪等手段研究了矿化剂(石英玻璃粉)含量对氧化镁基陶瓷型芯物相组成、微观组织、烧结收缩率、显孔隙率、线热膨胀系数、室温抗弯强度、高温抗弯强度及型芯浸出率的影响。结果表明:随着石英玻璃粉含量提高,硅酸镁含量增加,陶瓷基体颗粒细化,由连通大孔隙向封闭小孔隙转变,颗粒间结合松散,脱除性能及抗弯强度大幅下降;添加30%SiO_(2)得到的氧化镁基陶瓷型芯综合性能最佳,其中烧结收缩率为2.8%,显孔隙率为32.9%,室温抗弯强度为15.1 MPa,采用体积浓度40%的CH3COOH水溶液浸泡120 h后型芯的浸出率为61.9%。The effects of the mineralizer(fused silica powder)content on the phase composition,microstructure,sintering shrinkage,apparent porosity,linear thermal expansion coefficient,room temperature and high temperature flexural strength,and leaching rate of magnesia-based ceramic cores were studied by means of X-ray diffraction,scanning electron microscopy(SEM)and energy dispersive spectrometry(EDS).The results show that with the increasing of fused silica powder content,the content of magnesium silicate increases,the ceramic matrix particles are refined,and the connected large pores are transformed into closed small pores.The bonding between the particles is loose,and the removal performance and flexural strength are greatly reduced.The MgO-based ceramic core obtained by adding 30%SiO_(2) has the best comprehensive performance.The sintering shrinkage rate is 2.8%,the apparent porosity is 32.9%,and the flexural strength at room temperature is 15.1 MPa.The leaching rate of the core is 61.9%when leached in 40%CH3COOH aqueous solution for 120 h.

关 键 词：陶瓷型芯 石英玻璃粉 氧化镁 抗弯强度 浸出率 

分 类 号：TG221[金属学及工艺—铸造]