涂层对材料挤出成形Al_(2)O_(3)陶瓷型壳表面精度的影响研究  

Study on the Effect of Coating on the Surface Accuracy of Al_(2)O_(3) Ceramic Shell via Material Extrusion 3D Printing

作　　者：杨力 王盼龙 唐世艳 杨致远 刘菁非 赵建伟 徐子桢 樊自田[1] YANG Li;WANG Pan-long;TANG Shi-yan;YANG Zhi-yuan;LIU Jing-fei;XU Zi-zhen;FAN Zi-tian(School of Materials Science and Engineering,Huazhong University of Science and Technology,State Key Laboratory of Materials Processing and Die&Mould Technology,Wuhan 430074,Hubei,China)

机构地区：[1]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269-278,共10页Foundry

基　　金：国家自然科学基金(52205365,52275334,51775204);湖北省博士后先锋人才跟踪支持项目(2024HBBHXF025)。

摘　　要：采用材料挤出成形技术直接成形熔模铸造用陶瓷型壳,可大大简化熔模铸造制壳的工艺流程。然而,由于挤出技术“逐层叠加”的成形特征,所制备的陶瓷型壳表面存在较明显的层纹效应从而导致表面精度较差,难以满足熔模铸造陶瓷型壳的表面精度要求。因此,本文开发了一种适用于浆料挤出成形陶瓷件的表面涂层材料及其涂装工艺,主要研究了涂层对挤出成形Al_(2)O_(3)基陶瓷表面精度的影响及机理。结果表明:通过高温处理,涂层材料可以耐受1500℃的高温,并且与基体结合良好,不开裂,不脱落;涂层使陶瓷件表面粗糙度Ra由12.5~30μm降低至3.2~6.3μm,极大改善了浆料挤出成形陶瓷件表面精度,基本满足熔模铸造的精度要求。The ceramic shell for investment casting is directly formed by material extrusion 3D printing,which can greatly simplify the process flow of investment casting.However,due to the“layer-by-layer superposition”forming characteristic,the surface of the prepared ceramic shell has obvious laminar effect,which leads to poor surface accuracy,and it is difficult to meet the surface accuracy requirements of investment casting.Therefore,a surface coating material and its coating process suitable for slurry extrusion forming of ceramic parts were developed in this paper.The influence and mechanism of coating on the surface accuracy of Al_(2)O_(3)-based ceramics formed by slurry extrusion were mainly studied.The coating was firmly bonded with the substrate and that the coating did not crack and fall off at 1500℃.The coating reduces the surface roughness Ra of ceramic parts from 12.5-30μm to 3.2-6.3μm,which greatly improves the surface accuracy of ceramic parts formed by slurry extrusion and basically meets the accuracy requirements of investment casting.

关 键 词：材料挤出成形 陶瓷型壳 熔模铸造 表面粗糙度 涂层 

分 类 号：TG249.5[机械工程—精密仪器及机械]