摘要
基于以氧化铝粉为陶瓷基体,水玻璃为粘结剂的激光扫描固化冻结陶瓷浆料快速成型技术,针对水玻璃被激光扫描后的易发泡缺陷,利用COMSOL建立瞬态传热仿真模型确定合理的激光扫描间距和铺料厚度,并通过分别添加粉煤灰和硅酸铝纤维的方式以改变浆料粘度和化学特性。结果表明:当采用0.35 mm的扫描间距和0.2 mm的铺料厚度并分别添加40wt.%粉煤灰和5wt.%硅酸铝纤维时,发泡结构大幅度减少,平均泡孔孔径由188.33μm减小到80.46μm和100.96μm,改善了料层平整性。坯体的致密性增大,抗压强度分别达到30.1 MPa和28.8 MPa。
Focusing on slurries with alumina powder as ceramic matrix and sodium silicate as binder,which was frozen using the rapid prototyping laser scanning solidification technology,aiming at addressing the foaming issue of sodium silicate after laser scanning,a transient heat transfer simulation model was established using COMSOL to optimize the laser scanning spacing and the thickness of the slurry.Meanwhile,fly ash and aluminium silicate fibers were added to control the viscosity and chemical characteristics of the slurry.When 0.35 mm scanning distance and 0.2 mm paving thickness were adopted,while 40 wt.%fly ash and 5 wt.%aluminium silicate fibers were added,the foam dimension was sign ificantly reduced,with the average pore sizes of the foams to be decreased from 188.33μm to 80.46μm and 100.96μm,so that the smoothness of the material layer was improved.The strength of the green body was increased,with compressive strength to be 30.1 MPa and 28.8 MPa,respectively.
作者
张其帅
陈桦
陈世浩
张灵静
张耿
ZHANG Qishuai;CHEN Hua;CHEN Shihao;ZHANG Lingjing;ZHANG Geng(School of Mechanical and Electrical Engineering,Xi'an Technological University,Xi'an 710021,Shaanxi,China)
出处
《陶瓷学报》
CAS
北大核心
2020年第1期106-114,共9页
Journal of Ceramics
基金
陕西省科技统筹创新工程计划项目(2014KTCQ01-22)。
关键词
激光扫描
发泡
粉煤灰
硅酸铝纤维
小孔径
laser scanning
foaming
fly ash
aluminium silicate fiber
aperture
作者简介
通信联系人:陈桦(1962-),男,博士,教授,E-mail:chenhua126@163.com。
