分层挤出成形陶瓷型壳的表面粗糙度研究  

Study on Surface Roughness of Ceramic Shell Prepared by Layered Extrusion Forming Technology

作　　者：王盼龙 杨力 杨致远 彭子伟 樊自田[1] WANG Pan-long;YANG Li;YANG Zhi-yuan;PENG Zi-wei;FAN Zi-tian(School of Materials Science and Engineering,Huazhong University of Science and 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,湖北武汉430074

出　　处：《铸造》2024年第6期818-824,共7页Foundry

基　　金：国家自然科学基金项目资助(52205365,52275334,51775204)。

摘　　要：熔模铸造在进行金属浇注之前,通常要经过蜡模压制、蜡模组树、蜡模沾浆、型壳脱蜡、型壳焙烧等工序制备陶瓷型壳,而采用分层挤出成形技术直接成形陶瓷型壳,可大大简化熔模铸造的工艺流程。本文基于氧化铝陶瓷浆料,主要研究了分层挤出成形关键工艺参数(喷嘴直径、挤出层高和成形角度)对陶瓷型壳表面粗糙度的影响,构建了挤出成形陶瓷型壳的表面粗糙度数学模型,并采用涂层后处理工艺进一步降低了陶瓷型壳的表面粗糙度。结果表明:采用分层挤出成形技术,当喷嘴直径为0.26 mm、挤出层高为0.2 mm、成形角度为90°时,试样表面粗糙度Ra最低为(12.9±0.9)μm,施加涂层后,表面粗糙度Ra可降低至6.3μm以下。The ceramic shell in investment casting is typically prepared through a series of steps including wax mold pressing,wax mold tree assembly,wax mold stain slurry,mold shell dewaxing,and mold shell roasting.By utilizing layered extrusion forming technology,the ceramic shell can be directly formed,simplifying the process flow of investment casting significantly.This study focused on alumina ceramic paste and investigates the impact of key process parameters(nozzle diameter,extrusion layer height,and forming angle)on the surface roughness of the ceramic shell.A mathematical model for predicting surface roughness was established,and further reduction in surface roughness was achieved through post-treatment coating.Experimental results demonstrated that when using a nozzle diameter of 0.26 mm,an extrusion layer height of 0.2 mm,and a forming angle of 90°,the sample′s surface roughness Ra reached its lowest value at(12.9±0.9)μm;after applying the coating treatment,this value was reduced to less than 6.3μm.

关 键 词：分层挤出成形 工艺参数 表面涂层 陶瓷型壳 熔模铸造 

分 类 号：TG249.9[金属学及工艺—铸造] TG84