激光烧结尼龙12/ 累托石复合材料的结构与性能

STRUCTURE AND PROPERTIES OF PA12/ RECTORITE COMPOSITEPREPARED BY SELECTIVE LASER SINTERING

摘要: 将尼龙12 与有机累托石的混合粉末进行激光烧结成型, 利用X 射线衍射(XRD) 、差示扫描量热分析(DSC) 、扫描电镜(SEM) 等手段对烧结试样的材料结构进行了表征, 并对其力学性能及热性能进行了研究。结果表明: 尼龙12 在激光烧结过程中插入到累托石层间, 形成了尼龙12/ 累托石纳米复合材料。复合材料的力学性能及热稳定性能同尼龙12 烧结试样相比均有不同程度的提高, 有机累托石质量分数为10 %时, 复合材料的拉伸强度、弯曲强度和冲击强度分别提高了10.7 %、15.9 %和38.7 % , 热分解温度提高了27 ℃。

Abstract: A kind of blended powder of PA12 and organic rectorite (OREC) was molded by selective laser sintering (SLS) . The st ructure of sintered PA12/ rectorite composite was characterized by XRD , DSC and SEM , and it sthermal stability and mechanical properties were studied. The result s show that the organic rectorite is intercalatedby PA12 during the sintering process , and the thermal stability and the mechanical properties of the PA12/ rectoritenanocomposite are better than those of sintered pure PA12. With 10 % mass f raction of OREC , the tensile st rength ,flexural st rength and impact st rength are improved by 10.7 % , 15.9 % and 38.7 % , respectively , and the thermaldecomposition temperature increases by 27 ℃.