摘要
采用熔融共混法制备了Al2O3/尼龙12(PA12)复合颗粒料,并用低温破碎法制得复合粉体。在选择性激光烧结(SLS)成型机中进行成型试验,对成型试样进行热处理。研究了制备的Al2O3/PA12复合粉体的SLS可成型性以及热处理对SLS成型试样致密度的影响。利用扫描电子显微镜(SEM)观察热处理前后试样内部颗粒结合情况。结果表明,Al2O3粉体和PA12经熔融挤出后低温破碎可以制得满足SLS成型要求的复合粉体;该复合粉体在SLS成型机中能烧结得到外形规整的试样,SEM观察到试样内部粉体颗粒结合良好,相对密度达到74%;经200℃热处理后,试样相对密度提升到84%,SEM观察到试样内部粉体颗粒间结合得更紧密。
The preparation of Al203/PA12 composite powder was processed by melt blending. It was used in the selective laser sintering （SLS） molding by crushing at low temperature. The molding sample was heat treated. Mold ability of the composite powder in the SLS molding machine and the effect of the heat treatment on the density of the specimen were investigated. The combination of particles inside the specimen before and after the heat treatment were observed by SEM. The results showed Al2O3/PA12 composite powder made by melting-blending and low temperature crushing could fit the requirement of SLS molding and the specimen was with neat profile, good internal combination and a relative density of 74% could be obtained. After a heat treatment at 200 ℃, internal combination between particles were strengthened and the relative density of specimen increased to 84%.
出处
《塑料工业》
CAS
CSCD
北大核心
2015年第2期130-135,共6页
China Plastics Industry
基金
浙江省自然科学基金资助项目(LY14E030002)
