基于浆料挤出法的铸造型壳增材制造用铝矾土浆料研究  

Investigation on Bauxite Slurry for Additive Manufacturing of Casting Shell Mold Based on Slurry Extrusion Method

作　　者：刘洪军[1,2] 王军宏 苏国梁 李亚敏[1] LIU Hong-jun;WANG Jun-hong;SU Guo-liang;LI Ya-min(School of Maternals Science and Engineering.Lanzhou University of Technology,Lanzhou 730050,Gansu,China;State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals,Lanzhou University of Technology,Lanzhou 730050,Gansu,China)

机构地区：[1]兰州理工大学材料科学与工程学院,甘肃兰州730050 [2]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050

出　　处：《铸造》2022年第8期1005-1011,共7页Foundry

基　　金：甘肃省重点研发计划(18YF1GA064)

摘　　要：基于浆料挤出法的铸造型壳增材制造工艺关键在于陶瓷浆料的制备,研究了以硅溶胶为粘结剂的铝矾土浆料,分析了浆料成分对浆料性能和增材制造成形效果的影响。结果表明:球磨时,浆料粘度随着硅溶胶含量的提高而减小,分散剂含量为4.1vol%时,浆料粘度最低;在球磨后浆料中加入增稠剂,调控浆料屈服应力在300~400 Pa范围内,可兼具挤出流畅性和自支持性;采用优选的浆料成分,经球磨和调节粘度后,所制备的浆料挤出成形性良好,满足型壳增材制造的要求;层高值为挤出口直径的80%~85%、烧结温度为1 050~1 100℃时,增材制造试样的抗弯强度在9 MPa以上,可获得良好的成形精度。The preparation of ceramic slurry is the key to the additive manufacturing process of casting shell mold based on slurry extrusion method. Bauxite slurry with silica sol as binder was investigated and the effects of slurry composition on slurry properties and extrusion process were analyzed. During ball milling, the slurry viscosity decreased with the increase of silica sol content, and the slurry viscosity was the lowest when the dispersant content was 4.1 vol%. Adding thickener into the slurry after ball milling was used to adjust the yield stress of the slurry in the range of 300-400 Pa, and the slurry had good extrusion fluency and self-supporting ability.With the optimized slurry composition, the slurry prepared by the ball milling and viscosity adjustment had good extrusion formability and met the requirements of the shell mold preparation. When the layer height was 80%-85% of the nozzle diameter and the sintering temperature was 1 050-1 100 ℃, the bending strength of the additive manufacturing samples was more than 9 MPa, and a good forming accuracy was obtained.

关 键 词：增材制造 浆料挤出 铸造型壳 铝矾土浆料 

分 类 号：TG221[金属学及工艺—铸造]