金刚石-cBN-硬质合金复合柱齿的理论分析

基金项目:

国土资源部“九五”重点科技攻关项目 9505402-4

THEORETICAL ANALYSIS OF COMPOSITE BUTTON COMPOSED OF DIAMOND cBN AND TUNGSTEN CARBIDE

1.
Faculty of Engineering, China University of Geosciences, Wuhan 430074, China
2.
Faculty of Exploration Engineering, Changchun University of Science and Technology, Changchun 130026, China

摘要: 通过多种分析手段对所研制的金刚石-立方氮化硼(cBN) -硬质合金超硬复合柱齿进行了深入的研究分析, 得出了由于B的烧结促进和强化作用、Ni-P的活化烧结作用以及cBN加入, 大大提高了超硬复合柱齿的性能, 同时还分析指出, 在金刚石与基体合金之间存在过渡区, 该过渡区能有效地保护金刚石免受高温损伤, 另外, 该过渡区还大大增强了基体与金刚石之间的结合强度.
- 金刚石 /
- 立方氮化硼(cBN) /
- 硬质合金 /
- 复合柱齿 /
- 活化烧结 /
- 机理分析
Abstract: This paper presents a new type of composite button composed of diamond and cubic boron nitride-enhanced tungsten carbide. The working properties such as hardness, bending strength, and abrasion ratio of this type of composite button increases by a large margin because of the integration of the boron-sintering promotion and enhancement, the Ni-P activation sintering, and the addition of cubic boron nitride. In addition, a transitional zone between diamond particles and matrix alloy can effectively prevent the carbon atoms of the diamond surface from diffusion, a key element to protect diamond from deformation and damage at a high temperature. Furthermore, this transitional zone increases greatly the bonding strength between diamond and matrix alloy.
- diamond /
- cubic boron nitride (cBN) /
- tungsten carbide /
- composite button /
- activation sintering /
- mechanic analysis

图 1 Co-P合金和Ni-Co-P合金的晶界偏析物特征

a.Co-P合金晶界偏析磷化物电镜图像; b.Ni-Co-P合金晶界偏析磷化物电镜图像

Fig. 1. The feature of crystal interface of Co-P alloy and Ni-Co-P alloy

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图 2 金刚石-cBN-硬质合金复合柱齿超硬部分断口(a) 与常规含金刚石复合材料断口(b) 二次电子图像对比

Fig. 2. Comparison of electronic images of diamond_cBN enhanced TC composite material fracture surface with traditional diamond composite button fracture surface

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表 1 cBN-Ni系加热后生成的各相

Table 1. Materials generated by heated cBN-Ni mixture

表 2 超硬复合柱齿基体电子探针分析结果

Table 2. Compounds of new type button matrix alloy obtained by electronic probing %

[1]	马保松. 金刚石-cBN -硬质合金超硬复合体的研制[D]. 长春: 长春科技大学, 1998.4.
[2]	郭志猛, 宋月清, 陈宏霞, 等. 超硬材料与工具[M ]. 北京: 冶金工业出版社, 1996.

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