光学精密工程2023，Vol.31Issue(23)：3449-3456,8.DOI:10.37188/OPE.20233123.3449
氧化时间对增材制造碳化硅性能提升的作用机制
Mechanism analysis of oxidation time on performance improvement of additive manufacturing silicon carbide
摘要
Abstract
Additive manufacturing combined with reactive sintering can be used to fabricate extremely lightweight silicon carbide ceramic mirrors.However,the mechanical properties of silicon carbide pre-pared by this method,such as flexural strength and elastic modulus,are low and insufficient.A novel method was proposed to improve the properties of silicon carbide by high temperature oxidation.First,sili-con carbide prepared by additive manufacturing and reactive sintering was oxidized at 850℃.Thereafter,the effect of oxidation time on material composition and surface defect content was studied.The enhance-ment mechanism of oxidation time on the properties of silicon carbide was elucidated.The results demon-strate that when the oxidation time is 2 h,a dense silica film is in-situ grown on the surface of the material,which can render the surface defects of the material to self-heal and effectively reduce their contents.In ad-dition,the final body obtained the best comprehensive properties by this method,and the flexural strength and elastic modulus are 263.9 MPa and 384.75 GPa,with increments of 10.7%and 14.4%,respective-ly.This method has the advantages of high efficiency,low cost,and easy operation.The study provides theoretical guidance for improving the performance of additive manufacturing silicon carbide ceramics.关键词
增材制造/反应烧结碳化硅/氧化时间/性能优化Key words
additive manufacturing/reaction-bonded silicon carbide/oxidation time/properties regulation分类
化学工程引用本文复制引用
李伟,张舸,崔聪聪,包建勋,郭聪慧,徐传享,张巍,朱万利..氧化时间对增材制造碳化硅性能提升的作用机制[J].光学精密工程,2023,31(23):3449-3456,8.基金项目
中国科学院长春光机所创新基金资助项目(No.Y02020006742) （No.Y02020006742）
长春市科技发展计划资助项目(No.21ZY04) （No.21ZY04）
