光伏硅线切割固体废料制备多孔SiC陶瓷

摘要

Porous SiC ceramic was prepared by adding colloid graphite and SiC powder to the main material photovoltaic silicon line cutting waste by the method of solid phase sintering.The effects of the sintering system and the addition of the amount of graphite on the property of porous SiC ceramic were mainly discussed.Results show that porous SiC ceramic was obtained by sintering polysilicon line cutting waste buried in carbon black.The bulk density,water absorptivity and porosity of the as-prepared sample sintered at 1400℃ were 1.65g/cm3,26.92％ and 43.96％,respectively.The water absorptivity,bulk density,and porosity of the sample prepared with the Si/C mol ratio of 1∶6 and sintered at 1600℃ were 15.65％,1.84g/cm3 and 38.25％,respectively.%以光伏硅线切割固体废料为主要原料,外加胶体石墨粉和碳化硅粉采用固相烧结法制备SiC多孔陶瓷.研究了烧成制度、石墨的加入量等对SiC多孔陶瓷性能的影响.结果表明:采用炭黑埋烧工艺可得到性能较好的多孔SiC陶瓷.在140℃时,切割回收废料直接炭黑填埋烧制,试样的体积密度为1.65g/cm3,吸水率为26.92％,显气孔率43.96％;在1600℃时,当配方中加入石墨,使得Si和C的摩尔比为1∶6时,试样的吸水率为15.65％,体积密度为1.84g/cm,显气孔率为38.25％.