三维打印结合反应烧结制备多孔氮化硅陶瓷  

Porous Silicon Nitride Ceramics Prepared by 3D Printing and Reaction Sintering

作　　者：翁作海[1] 曾庆丰[1] 谢聪伟[1] 彭军辉[1] 张瑾[1] 

机构地区：[1]西北工业大学超高温结构复合材料重点实验室,西安710072

出　　处：《材料导报》2013年第8期5-7,10,共4页Materials Reports

基　　金：国家自然科学基金(50802076);西北工业大学凝固技术国家重点实验室自主研究课题(65-TP-2011)

摘　　要：以硅粉(Si)为起始原料,糊精为粘结剂,采用三维打印(3DP)快速成型技术制备出多孔硅坯体,通过反应烧结得到高孔隙率的氮化硅(Si3N4)陶瓷。研究了反应烧结工艺对3DP多孔Si3N4陶瓷性能的影响。结果表明:3DP成型的硅坯体采用阶梯式升温机制,可得到抗弯强度为(5.1±0.3)MPa,孔隙率达(74.3±0.6)%的多孔Si3N4陶瓷。反应烧结后,样品的线收缩率小于2.0%。三维打印结合反应烧结法实现了复杂形状陶瓷构件的无模制造与净尺寸成型。Using silicon powder as starting material and dextrin as binder, porous silicon green body was pre- pared via 3D printing technology, and then highly porous silicon nitride ceramic was obtained by reaction sintering. The influence of sintering process on the property of the 3DP porous Sia N4 was investigated. The results show that, when the silicon green body was prepared by the 3D printer followed by the step-by-step heating process, porous Sia N4 ceramic with flexural strength of （5.1±0. 3） MPa and porosity of （74.3±0. 6）% was obtained. After reaction sintering, the linear shrinkages of the samples were smaller than 2.0%. Ceramic parts with complex shapes can be ma-nufactured by such hybrid 3DP and reaction sintering technology with free-form and near-net-shape features.

关 键 词：三维打印 反应烧结 多孔氮化硅 孔隙率 净尺寸成型 

分 类 号：TB321[一般工业技术—材料科学与工程]