摘要
结合高分子材料的选择性激光烧结(SLS)机理,研究了材料特性对SLS成形的影响,结果表明,表面张力是决定高分子材料烧结速率的重要因素,但不是造成高分子材料之间烧结速率存在差别的主要因素;粉末粒径越小,烧结速率越大,SLS成形件的表面光洁度、精度越高;粉末粒径分布会影响粉床密度;球形粉末成形件的形状精度、铺粉效果好于不规则粉末;材料黏度越小,烧结速率越大;材料本体强度越大,成形件强度越高;非晶态聚合物成形件的致密度低于晶态聚合物,而尺寸精度高于晶态聚合物。为SLS用高分子材料的选择与制备提供理论依据。
The effect of polymeric characteristics on the selective laser sintering （SLS） process was systematically studied according to the SLS forming mechanism for polymers. The results shows that： surface tension greatly affects sintering rates of polymers, but not the key factor that makes big differences in sintering rates between polymers; the powder with the smaller particle size has a higher sintering rate, and higher surface finish and accuracy of sintered parts; particle size distribution has an effect on the part bed density; spherical powders have higher part accuracy and better precision of powder layering than irregular ones; the higher material bulk strengths, the higher the strengths of sintered parts. These results provide theoretical basis for the selection and preparation of polymer powders for SLS.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2010年第8期145-149,共5页
Polymer Materials Science & Engineering
基金
国家863项目(2007AA03Z115)
关键词
选择性激光烧结
高分子材料
特性
selective laser sintering
polymeric materials
characteristics
