硅灰石填充改性尼龙12激光烧结材料

Wollastonite Filled Selective Laser Sintered Nylon 12

将尼龙12与硅灰石的混合粉末进行选择性激光烧结成型。研究了硅灰石对尼龙12烧结材料的填充改性作用。结果表明,烧结件的拉伸强度、弯曲强度及模量均随硅灰石含量的增加而显著增加,并在硅灰石质量分数为30%时,达到最大值,分别比未添加硅灰石的烧结件增加了35%、75%和111%,但冲击强度和断裂伸长率则有所降低。同样,加入硅灰石后,可使烧结件的热变形温度大幅度提高,同时提高了烧结件的尺寸精度,大大降低了材料成本。

The blended powder of nylon 12 and wollastonite was molded by selective laser sintering （SLS）. The modification effects of wollastonite on the properties of the SLS part were investigated. The result showed the tensile strength, bending strength and modulus of the SLS part were improved considerably with the increase of wollastonite content, and came up to the maximum values when the mass fraction of wollastonite was 30%, being 35 %, 75 % and 111% higher than those of the SLS part filled with no wollastonite respectively, while the impact strength and elongation at break decreased. Moreover, the addition of wollastonite rose the thermal distortion temperature of the SLS part, improved the dimensional accuracy of the SLS part, and lowered the material cost greatly.