选择性激光烧结石墨件的抗氧化性能  

Oxidation resistance of selective laser sintered graphite parts

作　　者：吴海华[1] 陈奎 孙瑜[1] 任超群 王俊[1] 主悔 黄才华[1] 李立军[1] WU Hai-hua;CHEN Kui;SUN Yu;REN Chao-qun;WANG Jun;ZHU Hui;HUANG Cai-hua;LI Li-jun(Hubei Key Laboratory of Hydroelectric Machinery Design and Maintenance,China Three GorgesUniversity,Yichang 443002,China)

机构地区：[1]三峡大学水电机械设备设计与维护湖北省重点实验室

出　　处：《材料热处理学报》2019年第7期165-171,共7页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51575313)

摘　　要：选择性激光烧结成型技术所制备的石墨件内部疏松多孔,其抗氧化性能不佳,难以直接作为高温功能结构件使用。本文通过改变石墨/酚醛树脂混合粉末的组成以及石墨件后处理工艺来提高其高温抗氧化性能,并考察了石墨件在900~1100℃的抗氧化性能。结果表明,在石墨/酚醛树脂混合粉末中添加硅粉和碳化硼粉末并在1100℃氧化时,B4C与SiC两种陶瓷相分别氧化生成B2O3和SiO2,并发生反应形成硼硅酸盐玻璃,降低了石墨件中的微孔数量,从而提高了选择性激光烧结石墨件的抗氧化能力。The graphite parts prepared by selective laser sintering technology are loose and porous inside, and their anti-oxidation performance is not good, which is difficult to use as high-temperature functional structural parts directly. In this paper, the composition of graphite/phenolic resin mixed powder and the post-treatment process of graphite parts were changed to improve their oxidation resistance at high temperature, and the oxidation resistance of the graphite parts at 900-1100℃ was investigated. The results show that when silica powder and boron carbide powder are added to graphite/phenolic resin powder and oxidized at 1100 ℃, B4C and SiC ceramic phases are oxidized to form B2O3 and SiO2, respectively, and borosilicate glass is formed by reaction of B2O3 and SiO2, which can reduce the number of micropores in the graphite parts, and improve the oxidation resistance of the selective laser sintered graphite parts.

关 键 词：选择性激光烧结石墨件 混合粉末组成 真空压力浸渍 高温抗氧化性能 

分 类 号：TF124.5[冶金工程—粉末冶金]