热解温度对直写3D打印石墨烯/SiC_(p)/SiC复合材料性能的影响  

Effect of Pyrolysis Temperature on the Properties of 3D Printed Graphene/SiC_(p)/SiC Composites Using Direct Ink Writing

作　　者：唐润 刘洪军[1] 李亚敏[1] TANG Run;LIU Hongjun;LI Yamin(State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,Lanzhou University of Technology,Lanzhou 730050,Gansu,China)

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050

出　　处：《陶瓷学报》2024年第5期959-967,共9页Journal of Ceramics

基　　金：国家自然科学基金(52062029)。

摘　　要：通过在碳化硅前驱体聚碳硅烷(PCS)溶液中加入石墨烯/SiC_(p)复合粉末,获得石墨烯/SiC_(p)/PCS浆料,采用直写3D打印(DIW)和高温烧结相结合制备了石墨烯/SiC_(p)/SiC复合材料。PCS在不同热解温度下具有不同的产物与性能,本文研究了热解温度对石墨烯/SiC_(p)/SiC复合材料性能的影响。800℃时PCS转化为非晶SiCxOy,随着温度升高至1500℃,非晶SiCxOy逐渐生成导电性更好的β-SiC与游离碳,石墨烯/SiC_(p)/SiC复合材料的电导率从0.93 S·m^(-1)升高至670 S·m^(-1)。1200℃时,复合材料抗压强度和容积密度分别达到最大的12.3 MPa和1.49 g·cm^(-3)。该研究提供了一种基于PCS浆料的直写3D打印工艺制备高导电轻质多孔石墨烯/SiC_(p)/SiC复合陶瓷的方法。Graphene/SiC_(p)/PCS slurry was obtained by adding graphene/SiC_(p)composite powder into polycarbosilane(PCS)solution of silicon carbide precursor.Graphene/SiC_(p)/SiC composites were prepared by direct ink writing 3D printing(DIW)and high temperature sintering.PCS has different products and properties at different pyrolysis temperatures.In this paper,the effect of pyrolysis temperature on the properties of graphene/SiC_(p)/SiC composites was studied.PCS is converted into amorphous SiCxOy at 800℃.As the temperature increases to 1500℃,β-SiCand free carbon with higher conductivity were gradually formed from the amorphous SiCxOy.Theconductivity of graphene/SiC_(p)/SiC composites increases from 0.93 S·m^(−1) to 670 S·m^(−1).At 1200℃,the compressive strength and bulk density of the composites reached the maximum of 12.3 MPa and 1.49 g·cm^(−3),respectively.This study provides a method to prepare highly conductive lightweight porous graphene/SiC_(p)/SiC composite ceramics by direct writing 3D printing process based on PCS slurry.

关 键 词：3D打印 直写成型 热解温度 石墨烯/SiC_(p)/SiC复合材料 抗压强度 电导率 

分 类 号：TQ174.75[化学工程—陶瓷工业]