TiC粒度及分散性对Mo合金组织与抗拉强度的影响

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摘要在金属Mo粉中分别添加粒度为0.5 μm的超细TiC和粒度为0.05 μm的纳米TiC粉末,含量(质量分数)均为6%,采用粉末冶金法制备Mo-TiC合金,研究TiC的粒度及分散性对Mo-TiC合金组织与抗拉强度的影响。结果表明：与添加超细TiC相比,添加纳米TiC对合金的抗拉强度提升较大,组织晶粒得到细化,在1950℃烧结时,Mo-纳米TiC合金的抗拉强度达到515 MPa,比Mo-超细TiC合金的最高抗拉强度提高30%以上,但存在纳米TiC在基体中团聚的问题。添加有机物作为分散剂后,Mo基体内的TiC团聚体由类球形转变成长条形,并有部分纳米TiC得到充分分散,且合金的晶粒进一步细化,强度提高,在1 850 ℃烧结的材料的抗拉强度达到615 MPa。

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	陈季勇
	范景莲
	成会朝

关键词 ： Mo-TiC合金, TiC粒度, 团聚, 有机分散剂, 抗拉强度

Abstract：Two Mo-TiC alloys with TiC mass fraction of 6% were prepared by powder metallurgy using ultrafine TiC powder with a particle size of 0.5 μm and a nanometer TiC powder with a particle size of 0.05 μm as raw materials. The effects of particle size and dispersion of TiC on the microstructures and tensile strength of Mo-TiC alloys were studied. The results show that, compared to the addition of ultrafine TiC powder, the addition of nanometer TiC powder has a significant improvement on the tensile strength of the alloy, but because the agglomeration of nano TiC powder in the matrix. When sintered at 1 950 ℃, the tensile strength of Mo-nano TiC alloy reaches 515 MPa, which is more than 30% higher than that of Moultrafine TiC alloy. After adding organic compound as a dispersant, the TiC aggregates in the Mo base are transformed from the spheroid to elongated shape, and some of the nanoscale TiC are fully dispersed the alloy grain is further refined and the strength of the alloy is improved. The tensile strength of the material sintered at 1 850 ℃ reaches 615 MPa.

Key words： Mo-TiC alloy TiC granularity agglomeration organic dispersant tensile strength

收稿日期: 2018-03-28 出版日期: 2019-07-19

ZTFLH:

TG146.412

通讯作者: 范景莲,教授,博士。电话：13974870592;E-mail: fjl@csu.edu.cn

引用本文:

陈季勇, 范景莲, 成会朝. TiC粒度及分散性对Mo合金组织与抗拉强度的影响[J]. 粉末冶金材料科学与工程, 2018, 23(6): 614-618.
CHEN Jiyong, FAN Jinlian, CHENG Huichao. Effects of particle size and dispersion of TiC on the microstructure and tensile strength of Mo alloy. Materials Science and Engineering of Powder Metallurgy, 2018, 23(6): 614-618.

链接本文:

http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2018/V23/I6/614

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