尼龙12覆膜铝粉激光烧结成形件的性能研究  

Properties of the selective laser sintered specimens of nylon12-coated aluminum powders

作　　者：闫春泽[1,2] 史玉升[1] 杨劲松[1] 徐林[1] 

机构地区：[1]华中科技大学材料成形与模具技术国家重点实验室,武汉430074 [2]中国地质大学武汉材料科学与化学工程学院,武汉430074

出　　处：《材料科学与工艺》2009年第5期608-611,共4页Materials Science and Technology

基　　金：国家科技型中小企业创新基金资助项目(05C262142011059)

摘　　要：常用的机械混合法很难将尼龙12和金属粉末材料混合均匀,容易出现偏聚,因而会造成选择性激光烧结(SLS)成形件中存在局部强度弱点、翘曲等缺陷.为此,提出了通过溶液沉淀法制备SLS成形用尼龙12覆膜铝粉,利用扫描电镜观察了尼龙12覆膜铝粉及烧结件断口的微观形貌,研究了铝粉含量及粒径对SLS成形件性能的影响.结果表明:尼龙12均匀地包覆在铝粉表面,无裸露铝粉颗粒存在,表明成功制备得到了尼龙12覆膜铝粉材料;当铝粉含量从0增大到50%时,烧结件的热变形温度、拉伸强度、弯曲强度、弯曲模量及硬度比纯尼龙烧结件分别提高了87℃、10.4%、62.1%、122.3%及70.4%;烧结件的拉伸强度、断裂伸长率及冲击强度均随着铝粉平均粒径的减小而增大.It is difficult for the commonly used mechanical mixing method to uniformly disperse the aluminum powders in the nylon12 matrix, and aluminum coagulation is formed. Therefore, nylon12-coated aluminum powders for the application in the selective laser sintering （SLS） were prepared by a solvent-precipitation method. Microcosmic morphologies of the composite powders were observed using SEM. The effects of aluminum contents and average particle sizes of aluminum powders on the properties of SLS parts were studied. Resuits show that aluminum particles are uniformly coated by nylon12, and there are almost no naked aluminum particles. When the content of aluminum powders is increased from 0 to 50wt%, the heat deflection temperature, tensile strength, bend strength, bend modulus, and hardness of the SLS specimens are increased by 87 ℃, 10.4%, 62. 1%, 122. 3% and 70.4% respectively; The tensile strength, elongation at break and impact strength of the SLS specimens are all increased with the decreasing average particle size of aluminum powders.

关 键 词：选择性激光烧结 尼龙12 铝粉 溶剂沉淀法 

分 类 号：TQ323.6[化学工程—合成树脂塑料工业]