间接SLS金属件的树脂增强研究

Resin Strengthened Metal Parts Manufactured by Indirect SLS

间接选择性激光烧结制造的金属零件毛坯经脱脂和高温烧结,所得零件存在大量的孔隙,故其致密度和强度较差,本文采用改性环氧树脂对上述方法制造的零件进行致密化浸渗,并采用DSC、TGA和SEM分析方法研究了不同配比的树脂渗剂的浸渗及渗后零件的力学性能。结果表明,渗剂环氧树脂和酚醛树脂的比例为2∶1时,所得零件的性能最佳,此时最佳渗入温度和固化温度分别为100℃和160℃,渗入后零件的耐热温度达200℃,而且零件的致密度也得到提高,浸渗前后零件的拉伸强度分别为7.64MPa和29.51MPa。该方法对制造注塑模具有一定的参考价值。

Metal green parts fabricated by indict selective laser sintering（SLS）normally have low density and mechanical properties because they consist of metal skeleton and pores after decomposition and high temperature sintering. Modified epoxy resin is used to infiltrate and density the parts to improve their mechanical properties. The infiltration processes of different composition resins and the mechanical properties of infiltrated parts are investigated by means of differential scan calorimetry （DSC）, thermal gravity analysis （TGA） and scanning electron microscopy （SEM）. The results shove thai optimal mechanical properties of the parts are obtained when the proportion of epoxy to phenolic resin is 2 ： 1, and the resin is infiltrated and cured at 100℃ and 160℃ respectively. The density of the parts is greatly improved, the tensile strength is 29.51MPa, which is about 20MPa more than that before infiltration and the heat resistant temperature reaches 200℃ , The plastic injection mold can be manufactured with reference to this approach.