氮化硅陶瓷粉末的选区激光烧结  

Selective laser sintering of coated Si_3N_4 ceramic powders

作　　者：赵靖[1] 马文江[2] 曹文斌[1] 李艳红[1] 李江涛[3] 葛昌纯[1] 

机构地区：[1]北京科技大学特种陶瓷研究室,北京100083 [2]北京科技大学应用科学学院,北京100083 [3]中国科学院理化技术研究所微珠工程研究中心,北京100101

出　　处：《北京科技大学学报》2006年第11期1038-1041,共4页Journal of University of Science and Technology Beijing

基　　金：国家重点基础研究"973计划"资助项目(No.2004CB719802);教育部博士基金资助项目;北京市科技新星计划资助(No.2003B12)

摘　　要：进行了将粘结剂包覆在陶瓷粉末表面以提高陶瓷粉末选区激光烧结（SLS）成型性能的研究．利用甲基丙烯酸甲酯单体以及甲基丙烯酸丁酯单体共聚反应制备出共聚物粘结剂，并分别采用红外光谱和DSC／TG法对其进行分析．结果表明，所制备的共聚物的主要成分是聚甲基丙烯酸甲酯和聚甲基丙烯酸丁酯，其玻璃化温度为102．0℃，在300～400℃之间失重超过80％．将自制共聚物与磷酸二氢铵以适当的比例混合，采用机械混合与喷雾干燥等手段对Si3N4陶瓷粉进行了包覆处理，并在SLS设备上进行了烧结成型实验，成功地实现了包覆粉末的SLS烧结．Efforts were focused on the improvement of fusibility of selective laser sintering （SLS） ceramic powders by the approach of coating some low melt-point binders on them. Methylmethacrylate monomer and butylmethacrylate monomer were synthesized and prepared as sintering binder. The infrared spectrum and DSC/TG method were employed to analyze the copolymer. The results showed the main composition of the copolymer is polymethylmethacrylate and polybutylmethacrylate, the glass transition temperature is 102.0 ℃ and the heat decomposition was beyond 80% between 300 - 400 ℃. The self-made copolymer and the inorganic binder NH4H2PO4 were mixed together by a proper proportion. The binders were used to coat Si3N4 ceramic powders by mechanical mixing and spray drying. The coated powders were sintered successfully by SLS.

关 键 词：选区激光烧结 粘结剂 SI3N4陶瓷 喷雾干燥 包覆 

分 类 号：TB321[一般工业技术—材料科学与工程]