纳米二氧化硅增强尼龙12选择性激光烧结成形件

Study on the reinforcement of nanosilica on the selective laser sintered nylon-12 parts

使用纳米二氧化硅增强尼龙12选择性激光烧结(SLS)成形件,通过溶剂沉淀法制备SLS用纳米二氧化硅/尼龙12复合粉末材料,研究了纳米二氧化硅对SLS成形件力学性能的影响.结果表明:纳米二氧化硅以纳米尺寸均匀分散在尼龙12基体中:复合粉末的粒径比纯尼龙12的粉末小,因而有利于提高烧结速率及成形件精度;复合粉末比尼龙12的粉末具有更高的热稳定性;复合粉末烧结件的拉伸强度、拉伸模量以及冲击强度比纯尼龙12烧结件分别提高了约20.9%、39.4%和9.5%,说明纳米二氧化硅对尼龙12 SLS成形件的增强效果显著.

Nanosilica was used to reinforce the selective laser sintering （SLS） parts of nylon-12, and a dissolution-precipitation process was successfully developed to prepare a nanosilica/nylon-12 composite powder （3% nanosilica） for SLS. The effect of nanosilica on the mechanical properties of the SLS parts was also investigated. The results show that nanosilica disperses uniformly on a nano-scale level in the nylon- 12 matrix; the composite powder has a smaller particle size than that of the neat nylon-12 powder, which helps to improve the sintering rate and part accuracy; the composite powder has much higher thermal stability than that of neat nylon-12; the tensile strength, tensile modulus and impact strength of the SLS specimens made from the composite powder are 20.9%, 39.4% and 9.54%, indicating that nanosilica has a remarkable reinforcement effect on nylon-12 SLS parts.