工艺参数对聚苯乙烯/碳纤维SLS烧结件精度及致密度的影响
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摘要
通过选区激光烧结技术对聚苯乙烯/碳纤维(PS/CF)复合粉末材料进行烧结实验,研究了工艺参数对PS/CF烧结件致密度和微观组织的影响及规律。结果表明,在烧结过程中烧结件致密度随着预热温度和激光功率的增大而不断提高;随着扫描速度和分层厚度增大而减小。在保证成型精度的前提下,最佳的工艺参数组合为:预热温度85℃,激光功率30 W,扫描速度1 800 mm/s,分层厚度0.20 mm;此时烧结件Z向尺寸偏差仅为1.55%,致密度可达72.35%。通过SEM微观分析可以看到,随着PS/CF复合材料烧结件致密度的提高,PS熔化程度越高,烧结件内部PS与CF融合得越充分,浸入PS中的CF含量越高。
The polystyrene/carbon fiber composite powder was fabricated by selective laser sintering(SLS) technique, the influence and rules of different fabrication parameters on the density and microstructure were studied. The results show that the density of the sintered parts is increased by rising the preheating temperature and laser power,and decreases while the scanning speed and delamination thickness are increased. To keep the accuracy standard,the optimum technology parameter combination is as follows:preheating temperature 85 ℃,laser power 30 W,scanning speed 1 800 mm/s and delamination thickness0. 20 mm. Under the optimum parameter combination,the relative error of the Z-aixs size is 1. 55%,the sample density is 72. 35%. According to scanning electron microanalysis,the higher the density of PS/CF composite sintered parts, the higher the PS melting degree, the greater the fusion of PS and CF in the sintered parts,the higher the CF content in PS.
The polystyrene/carbon fiber composite powder was fabricated by selective laser sintering(SLS) technique, the influence and rules of different fabrication parameters on the density and microstructure were studied. The results show that the density of the sintered parts is increased by rising the preheating temperature and laser power,and decreases while the scanning speed and delamination thickness are increased. To keep the accuracy standard,the optimum technology parameter combination is as follows:preheating temperature 85 ℃,laser power 30 W,scanning speed 1 800 mm/s and delamination thickness0. 20 mm. Under the optimum parameter combination,the relative error of the Z-aixs size is 1. 55%,the sample density is 72. 35%. According to scanning electron microanalysis,the higher the density of PS/CF composite sintered parts, the higher the PS melting degree, the greater the fusion of PS and CF in the sintered parts,the higher the CF content in PS.
引文
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[3]杨来侠,刘旭.选区激光烧结聚苯乙烯粉的基础实验研究[J].激光技术,2016,40(5):767-771.
[4]徐志锋,张坚,郑海忠,等.基于选区激光烧结技术的纳米Al2O3改性PS的试验[J].高分子材料科学与工程,2005(3):223-226.
[5]LIU S T,LI Y G,LI N Y.A novel free-hanging 3D printing method for continuous carbon fiber reinforced thermoplastic lattice truss corestructures[J].Mater Des,2017,137:235-244.
[6]赵贞慧.基于选区激光烧结的聚苯乙烯/碳纤维材料增强工艺研究[D].西安:西安科技大学,2017.
[7]赵保军,施法中,冯涛,等.选区激光烧结成型中致密度的数值模拟与实验[J].激光技术,2003(1):40-43.
[8]孙晶.铁路货车用B+钢壁厚与组织致密度及力学性能关系的研究[D].大连:大连交通大学,2010.
[9]范春华,董丽华,黄开旭.Fe-C混合粉末激光烧结成形致密度分析[J].中国激光,2008(1):137-141.
[10]王尚军,凌国平,孟亮.烧结工艺对纳米Ag Sn O2复合材料致密度的影响[J].稀有金属材料与工程,2007,36(1):157-161.
[11]郑海忠,张坚,徐志峰,等.激光能量密度对纳米Al2O3/PS复合材料致密度和显微结构的影响[J].中国激光,2006(10):1428-1433.
[12]陈帅,陶凤和,贾长治,等.选区激光熔化成型H13钢的致密度与组织研究[J].现代制造工程,2014(8):34-36,109.
[13]顾冬冬,沈以赴,杨家林,等.多组分铜基金属粉末选区激光烧结致密化机理[J].中国有色金属学报,2005(4):596-602.
[14]李学闵.多相复合材料重量比、体积比及密度的简易计算法[J].玻璃钢,1981(6):43-44
[15]杨来侠,周文明.选择性激光烧结PS/ABS复合粉末成型件精度的实验研究[J].塑料工业,2017,45(8):35-38.
[16]孙胜伟,张坚,郑海忠,等.激光选区烧结PS制件的精度研究[J].现代塑料加工应用,2007(1):26-28.