Ti(C,N)含量和烧结温度对梯度硬质合金脱β层厚度的影响

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摘要以Ti(C,N)为N源,在脱氮气氛下烧结制备WC-TiC-Ti(C,N)-TaC-NbC-Co硬质合金,研究Ti(C,N)含量和烧结温度对脱β层厚度及合金微观组织与性能的影响。结果表明：随Ti(C,N)的质量分数从0.5%增加到1.5%,脱β层厚度持续增大。随烧结温度升高,脱β层厚度增大,增大的幅度随Ti(C,N)含量增加而增大。合金的密度、硬度和矫顽磁力不受Ti(C,N)含量的影响,但随烧结温度升高,合金的硬度降低、矫顽磁力变小、WC平均晶粒尺寸增大且直边化。脱β层中无明显的WC晶粒异常长大现象,脱β层厚度由Ti的扩散和N含量决定。

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	孙东平
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关键词 ：硬质合金, 脱β层, Ti(C,N)含量, 烧结温度, 梯度

Abstract：WC-TiC-Ti(C,N)-TaC-NbC-Co cemented carbide was prepared in denitrification atmosphere with Ti(C,N) as N source. The effects of Ti(C,N) content and sintering temperature on the thickness of β-free layer, properties and microstructure of the cemented carbides were investigated. The results show that the thickness of β-free layer increases with increasing mass fraction of Ti(C,N) from 0.5% to 1.5%. With the increase of sintering temperature, the thickness of β-free layer increases, and the increment increases with increasing Ti(C,N) content. The density, hardness and coercivity of the alloy are not affected by Ti(C,N) content. However, with the increase of sintering temperature, the hardness decreases, the coercivity decreases, and the average grain size of WC increases and becomes straight. There is no obvious abnormal growth of WC grains in the β-free layer, and the thickness of β-free layer is determined by the diffusion of Ti and the content of N.

Key words： cemented carbides β-free layer Ti(C,N) content sintering temperature gradient

收稿日期: 2020-11-06 出版日期: 2021-03-22

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通讯作者: 程登峰,工程师,硕士。电话：18870920728;E-mail: amicay@163.com

引用本文:

程登峰, 孙东平, 刘娜娜. Ti(C,N)含量和烧结温度对梯度硬质合金脱β层厚度的影响[J]. 粉末冶金材料科学与工程, 2021, 26(1): 47-54.
CHENG Dengfeng, SUN Dongping, LIU Nana. Effects of Ti(C,N) content and sintering temperature on the thickness of β-free layer of graded cemented carbides. Materials Science and Engineering of Powder Metallurgy, 2021, 26(1): 47-54.

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http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2021/V26/I1/47

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