碳酸钙改性聚苯乙烯的初步选择性激光烧结实验

针对选择性激光烧结(SLS)成型的高分子粉末烧结件尺寸精度差、强度低的问题,以聚苯乙烯(PS)为基体粉末,探讨了不同扫描速度下铝酸酯偶联剂处理前后的碳酸钙对PS粉末烧结性能的影响。结果表明,随扫描速度的增加,烧结件的尺寸精度提高、弯曲强度降低;未经处理的碳酸钙对PS烧结件的尺寸精度没有影响,反而降低了弯曲强度;经铝酸酯处理的碳酸钙在一定程度上提高了PS烧结件的尺寸精度和弯曲强度,当扫描速度为1 500 mm/s时,添加质量分数为2%的经铝酸酯处理的碳酸钙,PS烧结件的Z向高度相对误差为4.25%,较纯PS烧结件减少了48.5%,弯曲强度达到6.32 MPa,比纯PS烧结件提高了18.4%,但当扫描速度提高到1 800,2 000 mm/s时,两者之间的弯曲强度差异变小。

Preliminary Selective Laser Sintering Experiment of Polystyrene Modiifed by Calcium Carbonate

According to the problems that the size precision and mechanical strength of polymer powder sintering parts molded by SIS are too low,polystyrene (PS) were selected to act as SLS matrix materials,the effects of calcium carbonate treated by alumi-num acid ester coupling agent and untreated calcium carbonate on the sintering performance of PS powder under different scanning speed were discussed. The results show that with the increase of scanning speed,the size precision of PS sintering part increases and the bending strength decreases. The untreated calcium carbonate has no effect on the size precision of PS sintering parts,but reduces the bending strength. Calcium carbonate treated with aluminum acid ester can improve the size precision and bending strength of PS sintering parts to some extent. When the scanning speed is 1 500 mm/s,the Z-direction height relative error of PS sintering part filledwith 2% calcium carbonate treated by aluminum acid ester is 4.25% and decreases by 48.5% comparing with pure PS sintering part,the bending strength reaches 6.32 MPa and increases by 18.4% comparing with pure PS sintering part,but when the scanning speed is improved to 1 800 or 2 000 mm/s,the difference of bending strength of the two sintering parts is slight.