Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

您目前所在的位置:首页 - 期刊简介 - 详细页面

中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第19卷    第8期    总第125期    2009年8月

[PDF全文下载]        

    

文章编号:1004-0609(2009)08-1424-07
TiC-TiB2增强MoSi2复合材料的力学性能及抗氧化行为
颜建辉1, 2,张厚安1,李益民2

(1. 湖南科技大学 先进材料制备及应用技术研究所,湘潭 411201;
2. 中南大学 粉末冶金国家重点实验室,长沙 410083
)

摘 要: 以MoSi2、Ti和B4C粉为原料,采用高温热压技术合成不同体积分数TiC-TiB2增强MoSi2复合材料,研究TiC-TiB2颗粒对MoSi2基体材料显微组织、力学性能和高温氧化性能的影响。结果表明:30%TiC-TiB2/MoSi2(体积分数)复合材料的抗弯强度和维氏硬度分别达到468.3 MPa和17.07 GPa,比纯MoSi2的分别增加了63.2%和83.5%。随着TiC-TiB2体积分数的增加,复合材料的断裂方式由以沿晶断裂为主向以穿晶断裂为主转变,强化机制是细晶强化和弥散强化。在800~1 200 ℃氧化192 h时,30%TiC-TiB2复合材料的增质是10%TiC-TiB2复合材料的2.38~3.23倍。氧化层中没有发现低熔点的B2O3,而TiO2和SiO2的存在使材料具有较好的抗氧化性。

 

关键字: MoSi2;复合材料;TiC;TB2;力学性能;氧化行为

Mechanical properties and oxidation resistance behavior of
TiC-TiB2 reinforced MoSi2 composites
YAN Jian-hui1, 2, ZHANG Hou-an1, LI Yi-min2

1. Institute of Advanced Materials Synthesis and Application Technology, Hunan University of Science and Technology, Xiangtan 411201 China;
2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China

Abstract:TiC-TiB2/MoSi2 composites with different volume fractions of TiC-TiB2 particles were fabricated by hot press technology using MoSi2, Ti and B4C powders as raw materials. Effects of TiC-TiB2 particles on microstructure, mechanical properties and oxidation resistance properties of MoSi2 matrix were investigated. The results show that the flexure strength and hardness of 30%TiC-TiB2/MoSi2 composite are 468.3 MPa and 17.07 GPa, respectively. Compared with monolithic MoSi2, the flexure strength and hardness are enhanced by 63.2% and 83.5%, respectively. With the TiC-TiB2 particles content increasing, the fracture mechanism of the composites changes from intergranular fracture to transgranular fracture. The strengthening mechanisms of the composites are grain refine and dispersion strengthening. Oxidizing at 800−1 200 ℃, the mass gain of 30%TiC-TiB2 composites is almost 2.38−3.23 times as much as that of 10%TiC-TiB2/MoSi2 composites. Low melting glass phase of B2O3 can not be found in the oxidized layer, but TiO2 and SiO2 existing in the oxidation layer make TiC-TiB2/MoSi2 composites have good oxidation resistance.

 

Key words:

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

主管:中国科学技术协会 主办:中国有色金属学会 承办:中南大学
湘ICP备09001153号 版权所有:《中国有色金属学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市岳麓山中南大学内 邮编:410083
电 话:0731-88876765,88877197,88830410   传真:0731-88877197   电子邮箱:f_ysxb@163.com