浸渗法制备高铬铸铁/TiC-SiC复合材料及微观组织

doi:10.13251/j.issn.0254-6051.2022.11.038

金属热处理 ›› 2022, Vol. 47 ›› Issue (11): 216-222.DOI: 10.13251/j.issn.0254-6051.2022.11.038

浸渗法制备高铬铸铁/TiC-SiC复合材料及微观组织

朱俊璇¹, 杨帆¹, 尹梦涛¹, 刘海云²

1.兰州工业学院材料工程学院, 甘肃兰州 730050;
2.太原理工大学材料科学与工程学院, 山西太原 030024

收稿日期:2022-08-23 修回日期:2022-10-05 出版日期:2022-11-25 发布日期:2023-01-04
通讯作者: 刘海云,副教授,E-mail:liuhy1133@163.com
作者简介:朱俊璇(1985—),男,助教,硕士,主要研究方向为金属陶瓷复合材料,E-mail:zhujunxuan12345@163.com。
基金资助:
2022年甘肃省重点人才项目

Microstructure of high chromium cast iron/TiC-SiC composites fabricated by infiltration method

Zhu Junxuan¹, Yang Fan¹, Yin Mengtao¹, Liu Haiyun²

1. School of Materials Engineering, Lanzhou Institute of Technology, Lanzhou Gansu 730050, China;
2. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan Shanxi 030024, China

Received:2022-08-23 Revised:2022-10-05 Online:2022-11-25 Published:2023-01-04

摘要/Abstract

摘要： 采用小颗粒TiC包覆SiC陶瓷颗粒,在惰性气体保护下选用无压浸渗方法制备了高铬铸铁/TiC-SiC复合材料;利用SEM/EDX观察和分析了液态铸铁在SiC预制体中的浸渗情况、组织特征和成分分布;结合高铬铸铁/Ti-SiC复合材料的组织特点和浸渗行为特点,分析了TiC粉体对浸渗行为和复合材料组织的影响。观察结果表明,当TiC加入量≤10%(质量分数,下同)时,Fe/Cr合金无法润湿SiC颗粒,而当加入量≥20%时,Fe/Cr合金和预制体之间润湿性得到改善,增加TiC含量更有利于Fe/Cr合金浸渗;基体中大尺寸SiC颗粒消失,出现了尺寸接近毫米级的条状单质碳,这与高铬铸铁/Ti-SiC复合材料的组织差异较大。对比两种复合材料组织发现,添加Ti粉末在金属液中可与C结合生成TiC,而添加的TiC颗粒在组织中呈鹅卵石状,边缘圆润,出现金属液与陶瓷颗粒之间的互溶。在浸渗过程中,添加TiC和Ti与浸渗金属发生的反应不同,且高质量分数的TiC对金属液浸渗过程有明显的促进作用。

关键词: 金属陶瓷复合材料, SiC陶瓷复合材料, 浸渗法, 微观组织

Abstract: High chromium cast iron/TiC-SiC composites were fabricated by SiC ceramic particles coating with TiC particles of few microns and pressureless infiltration under the protection of inert gas. The infiltration situation, microstructure characteristics and composition distribution were observed and analyzed by means of SEM/EDX. Finally, combined with the microstructure characteristics and infiltration behavior of high-chromium cast iron/Ti-SiC composites, the effect of TiC powder on infiltration behavior and composite structure was analyzed. The observation results show that Fe/Cr alloy cannot wet the preform SiC particles when TiC addition ≤10%(mass fraction, as follow), while the wettability between Fe/Cr alloy and preform is improved when TiC addition ≥ 20%, increasing the TiC content is more conducive to Fe/Cr alloy infiltration. The large-sized SiC particles in the matrix disappear, and strip-shaped elemental carbon with a size close to millimeters appeares, which is quite different from the microstructure of high-chromium cast iron/Ti-SiC composites. Comparing the microstructure of the two composite materials, it is found that the added Ti powder can combine with C to form TiC in the molten metal, while the added TiC particles are cobblestone-like in the microstructure with rounded edges, mutual dissolution between molten metal and ceramic particles occurs. During the infiltration process, the added TiC and Ti react differently with the infiltrated metal, and the high mass fraction of TiC can significantly promote the molten metal infiltration process.

Key words: metal-ceramic composites, SiC ceramic composite material, infiltration method, microstructure

中图分类号:

TG148
TG379

朱俊璇, 杨帆, 尹梦涛, 刘海云. 浸渗法制备高铬铸铁/TiC-SiC复合材料及微观组织[J]. 金属热处理, 2022, 47(11): 216-222.

Zhu Junxuan, Yang Fan, Yin Mengtao, Liu Haiyun. Microstructure of high chromium cast iron/TiC-SiC composites fabricated by infiltration method[J]. Heat Treatment of Metals, 2022, 47(11): 216-222.

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浸渗法制备高铬铸铁/TiC-SiC复合材料及微观组织

Microstructure of high chromium cast iron/TiC-SiC composites fabricated by infiltration method

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