硅及硅钼合金常压反应烧结碳化硅基础研究  

Effects of Silicon and Silicon-molybdenum Alloys on Pressureless Reaction Sintering of Silicon Carbide

作　　者：曹祥薇[1,2] 李世建 赵小康 杨光远 熊枫[1,2] 杨怡婷 芮茂强 叶菁 邓腾飞 CAO Xiangwei;LI Shijian;ZHAO Xiaokang;YANG Guangyuan;XIONG Feng;YANG Yiting;RUI Maoqiang;YE Jing;DENG Tengfei(China Tobacco Hubei Industrial LLC,Wuhan 430070,Hubei,China;China Tobacco Hubei Industrial of Cigarette Material Co.,Ltd.,Wuhan 430040,Hubei,China;State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,Hubei,China)

机构地区：[1]湖北中烟工业有限责任公司,湖北武汉430070 [2]湖北中烟卷烟材料厂,湖北武汉430040 [3]武汉理工大学硅酸盐建筑材料国家重点实验室,湖北武汉430070

出　　处：《陶瓷学报》2025年第1期159-166,共8页Journal of Ceramics

基　　金：湖北中烟科技项目(2023JSGY4CL2C060)。

摘　　要：对氩气气氛下不同熔体参与反应烧结碳化硅陶瓷进行了系统研究。结果表明:硅熔体对烧结样品的浸润作用及其所导致的物理性能变化对实验温度具有高度敏感性,其中在1530℃时抗折强度为58.6 MPa,而在1570℃时则大幅提升至317.0 MPa。硅与炭黑之间的接触角是影响浸润深度的关键因素,而浸润深度与浸润温度呈正相关。硅钼合金浸润烧结样品在1530℃成功烧结,相对密度达到94%以上,这主要归因于钼硅合金较高的极化率,该特性有效降低了接触角。不同样品的物理性能随温度的变化改变不大,相对密度随温度升高最大增幅不超过2%,样品力学性能变化趋势相似。由于MoSi_(2)的偏析以及MoSi_(2)和SiC并不相容,样品的抗折强度和硬度低于在1570℃温度下被Si熔体反应烧结后样品。[Background and purpose]Silicon carbide(SiC)ceramics,with their superior physical properties,are widely utilized in various industrial sectors,particularly under harsh conditions such as high temperatures and pressures.Reaction-bonded silicon carbide(RBSC),favored for its ease of manufacturing and cost-effectiveness,has traditionally required vacuum sintering,which limits production capacity and increases costs.This study is aimed to study the feasibility of pressureless reaction sintering of SiC through infiltration of silicon melt and molybdenum-silicon(Mo-Si)alloy under argon(Ar)protection,in order to enhance process efficiency and reduce costs.[Methods]In this study,the effects of different melt infiltrations on the sintering behavior of SiC ceramics were systematically examined.Mo-Si alloy was prepared by mixing and melting molybdenum and silicon powders according to the phase diagram,followed by crushing into small pieces under Ar at 1500℃in BN crucible.Ceramic samples were fabricated usingα-SiC powder,carbon black,phenolic resin,and other additives,which were mixed and pressed into rectangular bars.After pre-firing to remove binders,the green bodies were then infiltrated with either silicon or Mo-Si alloy melts at temperatures between 1530℃and 1600℃.Density,microstructure,flexural strength,and hardness of the sintered samples were analyzed by using the Archimedes method,scanning electron microscopy(SEM),electronic universal testing machine,and Vickers hardness.[Results]It is found that the infiltration effect of silicon melt on physical properties of the sintered samples was highly sensitive to the processing temperature.For instance,the flexural strength was increased from 58.6 MPa at 1530℃to 317.0 MPa at 1570℃for the silicon-infiltrated samples.Meanwhile,Mo-Si alloy-infiltrated samples achieved a relative density exceeding 94%at 1530℃,due mainly to the higher polarizability of the Mo-Si alloy,reducing the contact angle between silicon and carbon.The mechanical properties of the Mo-Si alloy-i

关 键 词：反应烧结 碳化硅 保护气氛 浸润 MoSi2合金 

分 类 号：TQ174.75[化学工程—陶瓷工业]