摘要
采用自制宝珠覆膜砂,应用选择性激光烧结(SLS)法成形出系列"8"字试样,然后在不同填充方式和温度下对SLS试样进行加热烘烤。测试试样的拉伸强度和1000℃下的发气量,并利用电子显微镜观察断口形貌。最后得到了覆膜砂烧结件最优的后处理工艺,即填充玻璃微珠,烘烤温度200℃。得到的材料抗拉强度最大为6.28MPa,发气量最小为18.43ml/g,能很好满足浇铸要求。
The series of ＂8＂ specimens were made of pearl coated sand by selective laser sintering （SLS）. The specimens were strengthened by post-curing process with different packing materials and heating temperatures. Finally, the tensile strength and gas evolution at 1000℃ were measured. The fi＇actures were observed by SEM. Packing glass bead and heating at 200℃ is the best post-curing process,which can make the tensile strength reach 6.28MPa and the gas evolution reach 18.43ml/g, which can meet the requirement of molds and cores well. The curing characteristics were investigated.
出处
《热加工工艺》
CSCD
北大核心
2013年第11期21-23,27,共4页
Hot Working Technology
基金
国家重大科技专项:复杂零件快速精铸技术项目(2009ZX04014-075)
欧盟框架七项目(COLTS)
关键词
覆膜砂
选择性激光烧结
固化特性
浇铸
coated sand
selective laser sintering
strengthening characteristics
casting
