Si3N4结合SiC耐火材料的高温重烧结研究

耐火与石灰 ›› 2020, Vol. 45 ›› Issue (4): 7-10.

Si3N4结合SiC耐火材料的高温重烧结研究

刘臻吴吉光王佳平梁鹏鹏石会营

中钢集团洛阳耐火材料研究院有限公司先进耐火材料国家重点实验室，洛阳471039

出版日期:2020-08-10 发布日期:2020-08-20

High-temperature post-sintering of silicon nitride bonded silicon carbide refractories

Liu Zhen Wu Jiguang Wang Jiaping Liang Pengpeng Shi Huiying

Sinosteel Luoyang Institute of Refractories Research Co.,Ltd., State Key Laboratory of Advanced Refractories, Luoyang 471039, China

Online:2020-08-10 Published:2020-08-20

摘要/Abstract

摘要：

以Si粉、SiC颗粒和细粉为原料，通过反应烧结（最高烧成温度1 420 ℃）制备Si3N4结合SiC标型砖，再将标型砖在流动N2气氛、1 750 ℃烧结2.5 h，制得重烧结Si3N4结合SiC耐火材料。利用XRD、EDS、SEM和压汞法对重烧结前后的Si3N4结合SiC试样的化学组成、微区组成、微观结构以及孔径分布等性能进行检测，其结果表明： Si3N4结合SiC耐火材料高温重烧结后，外形基本没有变化，材料体积密度少量降低，常温抗折强度和1 400 ℃抗折强度少量提高，试样中纤维状Si3N4消失，α-Si3N4全部转变为较大尺寸的柱状β-Si3N4；试样平均孔径显著增加；试样抗高温水蒸汽氧化性能显著提高。

关键词: Si3N4结合SiC耐火材料, 重烧结, 抗水蒸汽氧化, 孔径分布

Abstract:

Based on Si powder,SiC grains and powder as the raw materials,Si3N4-bonded SiC standard bricks were prepared by reactive sintering (at maximum 1 420 ℃) through the same processes,which were then post-sintered at 1 750 ℃ for 2.5 hours in flowing N2 atmosphere. The phase compositions,micro-zone compositions,microstructure as well as pore-size distribution of Si3N4-bonded SiC samples before and after post-sintering were analyzed by means of XRD,EDS,SEM and mercury intrusion method respectively.The results showed that after post-sintering at high temperature,the Si3N4-bonded SiC refractories,in which fibrous Si3N4 disappeared and all α-Si3N4 were transformed to relatively large-sized columnar β-Si3N4,presented almost no dimensional change,only a little decrease of bulk density and a little increase of MOR and HMOR （1 400 ℃)；the average pore-size increased dramatically；the steam oxidation resistance at high temperature was also enhanced remarkably.

Key words: , Si3N4-bonded SiC refractory, Post-sintering, Steam oxidation resistance, , Pore size distribution

中图分类号:

TQ175.12

刘臻吴吉光王佳平梁鹏鹏石会营. Si3N4结合SiC耐火材料的高温重烧结研究[J]. 耐火与石灰, 2020, 45(4): 7-10.

Liu Zhen Wu Jiguang Wang Jiaping Liang Pengpeng Shi Huiying. High-temperature post-sintering of silicon nitride bonded silicon carbide refractories[J]. REFRACTORIES & LIME, 2020, 45(4): 7-10.

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