微喷射粘结增材制造CaO基陶瓷型芯  

Micro-jet Bonding Additive Manufacturing of CaO-based Ceramic Cores

作　　者：付培国 汪阿金 李刚辉 蒙德远 樊自田[3] 沈明学 赵火平 Fu Peiguo;Wang Ajin;Li Ganghui;Meng Deyuan;Fan Zitian;Shen Mingxue;Zhao Huoping(Chengdu Aircraft Industrial(Group)Co.,Ltd.;School of Materials Science and Engineering,East China Jiaotong University;State Key Laboratory of Materials Processing and Die&.Mould Technology,Huazhong University of Science and Technology)

机构地区：[1]成都飞机工业(集团)有限责任公司 [2]华东交通大学材料科学与工程学院 [3]华中科技大学材料成形与模具技术国家重点实验室

出　　处：《特种铸造及有色合金》2023年第1期29-33,共5页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51805170)。

摘　　要：以CaO和聚乙烯吡咯烷酮的混合粉末作为成形材料,纳米TiO_(2)无水乙醇分散液作为喷射溶液,通过微喷射粘结增材制造工艺和烧结工艺制备了CaO基陶瓷型芯。研究纳米TiO_(2)分散液喷射量对CaO基陶瓷型芯烧结收缩率、致密度、表面粗糙度、抗弯强度和抗吸湿性能的影响规律及其机理。结果表明,随纳米TiO_(2)分散液喷色量的增加,CaO基陶瓷型芯烧结收缩率、表面粗糙度和吸湿率随之降低,致密度和抗弯强度随之增加。纳米TiO_(2)加入后填充CaO陶瓷型芯坯体孔隙使致密度增加,烧结过程中TiO_(2)与CaO反应生成CaTiO_(3)促进烧结并减少CaO与空气中水分的接触。Taking mixed powder of calcium oxide and poly vinyl pyrrolidone as the forming material, and nano-titanium dioxide anhydrous ethanol suspension as the jet solution, the calcium oxide-based ceramic cores were fabricated by the micro-jet bonding additive manufacturing and sintering process. The influence of nano-titanium suspension jet content on the sintering shrinkage, density, surface roughness, bending strength and hydration resistance of calcium oxide-based ceramic cores as well as the mechanism were investigated. With the increase of nano-titanium suspension jet content, the sintering shrinkage, surface roughness and hygroscopicity of the calcium oxide-based ceramic core are decreased, while the relative density and bending strength are increased. Nano TiO_(2)is added to fill the pores of the calcium oxide ceramic core green body, leading to the increase of density. During the sintering process, TiO_(2)reacts with CaO to form calcium titanate, promoting the sintering and reducing contact of CaO with moisture in the atmosphere.

关 键 词：陶瓷型芯 增材制造 CAO 粘结剂喷射 抗吸湿性 

分 类 号：TG221[金属学及工艺—铸造]