烧结升温速率对微挤出3D打印水溶性氧化钙陶瓷型芯性能的影响  

Effect of Heating Rate on the Properties of Water-Soluble Calcia Ceramic Core Fabricated by Micro-Extrusion 3D Printing Forming Method

作　　者：胡柏林 穆英朋 刘富初 王妙[1,2] 徐永坤 刘浩 韩光超[1,2] 樊自田 HU Bo-lin;MU Ying-peng;LIU Fu-chu;WANG Miao;XU Yong-kun;LIU Hao;HAN Guang-chao;FAN Zi-tian(School of Mechanical Engineering and Electronic Information,China University of Geosciences,Wuhan 430074,Hubei,China;Shenzhen Research Institute,China University of Geosciences,Shenzhen 51805,Guangdong,China;State Key Laboratory of Materials Processing and Die&Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China)

机构地区：[1]中国地质大学(武汉)机械与电子信息学院,湖北武汉430074 [2]中国地质大学深圳研究院,广东深圳518057 [3]华中科技大学材料科学与工程学院,材料成形与模具技术全国重点实验室,湖北武汉430074

出　　处：《铸造》2025年第3期279-287,共9页Foundry

基　　金：广东省基础与应用基础研究基金自然科学基金面上项目(No.2024A1515013258);中央引导地方科技发展资金自由探索类基础研究项目(No.2021Szvup158);2023年度湖北省农业农村领域科技计划项目(No.2023BBB096);武汉市知识创新专项-基础研究项目(No.2022020801010196);深圳市基础研究重点项目(No.JCYJ20220818102601004);国家自然科学基金项目(No.52375395);中国地质大学(武汉)教学实验室开放基金项目(No.SKJ2023125和No.SKJ2024121);中国地质大学(武汉)中央高校基本科研业务费资助项目(No.2024XLB25和No.2024XLB26);国家级大学生创新创业训练计划项目(No.202410491047,No.202410491048,No.202410491058,No.S202410491017,No.S202410491102,No.X202410491055)。

摘　　要：以碳酸钙粉末为基体材料,聚乙二醇水溶液为粘结剂制备陶瓷浆料,采用微挤出3D打印技术制备细长陶瓷型芯坯体,再经分步式烧结工艺获得铸造用水溶性氧化钙陶瓷型芯。采用空气烧结,工业氧化铝粉末半埋和全埋烧结方法,研究了不同烧结升温速率对细长氧化钙陶瓷型芯形貌、烧结变形量、线性收缩率、弯曲强度和水溶速率等性能的影响规律及其机理。结果表明,工业氧化铝粉末全埋烧结方法可有效防止细长氧化钙陶瓷型芯的变形,并可同时提高陶瓷型芯的弯曲强度与水溶速率,降低收缩率。升温速率对细长氧化钙陶瓷型芯变形和裂纹具有较大影响,高升温速率下细长陶瓷型芯沿打印轨迹产生裂纹并具有较大的弯曲变形。当采用工业氧化铝全埋烧结方法,烧结温度为1300℃,升温速率2℃/min、保温时间为2 h时,烧结后的细长氧化钙陶瓷型芯没有裂纹,烧结变形量仅为0.11 mm,线性收缩率为10.67%,弯曲强度为4.96MPa,水溶速率为4.4g/(s·m^(2)),具有较好的综合性能。The ceramic slurry was prepared using calcium carbonate powder as the matrix material and polyethylene glycol aqueous solution as the binder,slender ceramic core green bodies were fabricated by micro-extrusion 3D printing forming technology,and then water-soluble calcia ceramic cores for casting were obtained by stepwise sintering process.The effect and mechanism of heating rate on the properties of slender calcia ceramic cores,such as morphology,sintering deformation,flexural strength,and water-soluble rate,were investigated by using the sintering methods of bare sintering,half-buried and fully-buried sintering of industrial alumina powder.The results show that the fully embedded sintering method of industrial alumina powder can effectively prevent the deformation of slender calcia ceramic cores,and simultaneously increase the flexural strength and water-soluble rate,while reduce the shrinkage rate.The heating rate has a great effect on sintering deformation and cracking of slender calcia ceramic cores,and the slender ceramic core cracks along the printing track under a high heating rate condition,presenting a large bending deformation.When the fully-buried sintering temperature is 1300℃,the heating rate is 2℃/min,and the holding time is 2 h,the sintered slender calcia ceramic cores have no cracks,and the sintering deformation is only 0.11 mm,the linear shrinkage rate is 10.67%,the flexural strength is 4.96 MPa,and the water-soluble rate is 4.4 g/(s·m^(2)),having good comprehensive properties.

关 键 词：氧化钙陶瓷型芯 微挤出3D打印 烧结升温速率 烧结变形 快速铸造 

分 类 号：TG241[金属学及工艺—铸造] TH164[机械工程—机械制造及自动化]