聚醚砜/煤矸石复合材料激光烧结工艺

Laser Sintering Process of Coal Gangue/Polyethersulfone Resin Composites

为将大量煤矸石进行合理处置和充分利用,利用选择性激光烧结技术对煤矸石粉末进行二次开发再利用,这一举措消除了煤矸石带来的环境污染,保护了珍贵的土地资源,具有重要的研究意义和现实价值。采用选择性激光烧结技术制备聚醚砜(PES)树脂/煤矸石复合材料成型件(CPES),探究烧结工艺参数中的粉床预热温度、激光功率对成型件力学性能及显微组织的影响规律。以激光功率、扫描速度、扫描间距、分层厚度为试验因子,以成型件的冲击强度、断裂伸长率为试验指标,选用四因素三水平正交试验,由试验结果可知:煤矸石质量分数为33.3%,粉床预热温度为78℃,激光功率为17 W,扫描速度为2000 mm/s,扫描间距为0.2 mm,分层厚度为0.1 mm时,CPES复合材料烧结件冲击强度为177.592 kJ/m^(2),断裂伸长率为1.09%,较纯PES材料烧结件冲击强度提高5.1%,断裂伸长率减小63.19%,满足GJC4(A)型矿用低浓度甲烷传感器使用要求,有助于在各种突发矿难情况下,减小井下极端环境中探测传感器变形量,在较大的冲击载荷作用下保证传感器的安全,提高井下探测效率,保证井下探测质量。

In order to dispose of and fully utilize a large amount of coal gangue,selective laser sintering technology was used for secondary development and reuse of coal gangue powder.This measure eliminates environmental pollution caused by coal gangue and protects precious land resources,which has important research significance and practical value.The selective laser sintering technology was used to prepare coal gangue/polyethersulfone(PES)resin composite molded parts(CPES),and the effects of powder bed preheating temperature,and laser power on the mechanical properties and microstructure of the molded parts were investigated in the sintering process parameters.Using laser power,scanning speed,scanning distance,and layer thickness as experimental factors,and the impact strength and fracture elongation of the formed part as experimental indicators,a four factor and three level orthogonal experiment were selected.The experimental results show that the coal gangue content is 33.3%,the preheating temperature of the powder bed is 78℃,the laser power is 17 W,the scanning speed is 2000 mm/s,the scanning distance is 0.2 mm,and the layer thickness is 0.1 mm.The impact strength of CPES composite sintered parts is 177.592 kJ/m^(2),and the elongation at break is 1.09%,which is 5.1%higher than that of pure PES sintered parts,and the elongation at break is reduced by 63.19%.This meets the requirements for the use of GJC4(A)type low concentration methane sensor in mining,and helps to reduce the deformation of the sensor in extreme underground environments in various sudden mining disasters,ensuring the safety of the sensor under large impact loads,improve the efficiency of underground exploration and ensure the quality of underground exploration.