真空和渗氮烧结WC-TiC-Co硬质合金的梯度结构形成机理研究

doi:10.11896/cldb.18110198

材料导报

2020, Vol. 34

Issue (4): 4077-4082 https://doi.org/10.11896/cldb.18110198

金属与金属基复合材料

真空和渗氮烧结WC-TiC-Co硬质合金的梯度结构形成机理研究

陈健^1,2, 周莉¹, 刘金洋², 吉红伟², 杨勇¹, 刘伟², 邓欣², 伍尚华²

1 广东技术师范大学机电学院,广州 510635;
2 广东工业大学机电工程学院,广州 510006

Research on Formation Mechanisms of Gradient Structures for WC-TiC-Co Carbides Under Vacuum and Nitriding Sintering

CHEN Jian^1,2, ZHOU Li¹, LIU Jinyang², JI Hongwei², YANG Yong¹, LIU Wei², DENG Xin², WU Shanghua²

1 School of Mechatronic Engineering, Guangdong Polytechnic Normal University, Guangzhou 510635, China;
2 School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China

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摘要本实验对真空和渗氮烧结的WC-20TiC-0.5VC-0.5Cr₂C₃-12Co硬质合金的微观结构进行了研究。研究表明烧结气氛对WC-TiC-Co硬质合金的梯度结构具有关键性影响:真空烧结能使硬质合金形成厚度不低于20 μm的无立方相表层,该表层主要由WC与Co相组成,无明显TiC相特征;而渗氮烧结促使硬质合金形成以Ti(C,N)与TiC为主要物相的富立方相表层。与此同时,研究发现氮气压强对富立方相表层的形成具有显著促进作用,随着氮气压强的提高,富立方相表层厚度明显增加。真空和渗氮烧结的硬质合金芯部微观组织均由WC相、(W,Ti)C相、TiC相与Co相组成。相对于渗氮烧结,真空烧结会导致硬质合金芯部WC的晶粒度增大。

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	伍尚华

关键词: 硬质合金烧结气氛梯度结构微观组织

Abstract: This paper has systematically investigated the gradient microstructures in WC-20TiC-0.5VC-0.5Cr₂C₃-12Co cemented carbides synthesized in vacuum and nitriding sintering, respectively. The study shows that sintering atmosphere has a critical effect on gradient structure of WC-TiC-Co carbide. The vacuum sintering results in a surface layer free of face center cubic (FCC) phase. The thickness of FCC-free surface layer is more than 20 μm. The nitriding sintering results in the formation of a FCC (Ti(C,N) and TiC) rich surface layer. It shows that N₂ pressure has an important effect on the thickness of FCC-rich surface layer. The higher N₂ pressure results in the thicker FCC-rich surface layer. The microstructure in the core of the carbides synthesized in either vacuum or nitriding sintering atmosphere shares similar microstructure of WC, (W,Ti)C, TiC and Co phases. Compared with nitriding sintering, vacuum sintering leads to coarser WC grains in the core of the carbide.

Key words: cemented carbide sintering atmosphere gradient structure microstructure

出版日期: 2020-02-25 发布日期: 2020-01-15

ZTFLH:	TF125.3
	TG135.5

基金资助: 广东省重大科技专项计划项目(2016B090914001);广东省科技计划项目(2017B090913006;2016A010102019);广东省普通高校青年创新人才类项目(2018KQNCX141)

通讯作者: dengxin@gdut.edu.cn

作者简介: 陈健,广东技术师范大学,讲师,2018年6月毕业于广东工业大学,获得工学博士学位。于2017年1月至2018年1月在美国University of Utah进行联合培养。主要从事梯度硬质合金制备、硬质合金刀具切削性能以及复合材料增材制造领域的研究;邓欣,广东工业大学机电工程学院特聘教授,国家千人计划特聘专家。邓欣教授在美国阿拉巴马大学伯明翰分校获得博士学位。在加入广东工业大学以前,邓欣教授曾在世界顶级硬质合金制造公司-肯纳金属,世界最大的石油服务公司-斯伦贝谢公司任高级研发工程师。邓欣教授的主要研究领域包括无铅焊料力学性能研究、金属基复合材料及粉末冶金材料力学性能研究、纳米硬质合金的制造及性能、非传统硬质合金刀具研究、硬质合金梯度材料制造及性能研究、硬质合金-金刚石复合材料以及特殊形状金刚石聚晶合成工艺及材料设计研究、金属基复合材料3D打印等。邓欣教授已经主持研发多项国际顶尖的硬质合金及超硬材料工具产品,发表专业论文40余篇,他引次数超过800,申请美国专利8项,授权3项。

引用本文:

陈健, 周莉, 刘金洋, 吉红伟, 杨勇, 刘伟, 邓欣, 伍尚华. 真空和渗氮烧结WC-TiC-Co硬质合金的梯度结构形成机理研究[J]. 材料导报, 2020, 34(4): 4077-4082.
CHEN Jian, ZHOU Li, LIU Jinyang, JI Hongwei, YANG Yong, LIU Wei, DENG Xin, WU Shanghua. Research on Formation Mechanisms of Gradient Structures for WC-TiC-Co Carbides Under Vacuum and Nitriding Sintering. Materials Reports, 2020, 34(4): 4077-4082.

链接本文:

http://www.mater-rep.com/CN/10.11896/cldb.18110198 或 http://www.mater-rep.com/CN/Y2020/V34/I4/4077

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