Effect of synthesis pressure on the properties of PcBN composites

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS Diamond and Related Materials Pub Date : 2024-10-24 DOI:10.1016/j.diamond.2024.111697

Peicheng Mo, Jiarong Chen, Peixun Wang, Xiaoyi Pan, Jun Zhang, Kai Li, Chao Chen

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Abstract

Polycrystalline cubic boron nitride (PcBN) composites were synthesized under high-temperature and high-pressure (HPHT) conditions using TiC, Al and Ti as binders. This study explores the influence of varying synthesis pressures on the microstructure, interfacial bonding, densification, and mechanical properties of PcBN composites. The test results indicate that as synthesis pressure increased, the diffusion of Al and Ti elements to the surface of cBN particles was enhanced. This facilitates the migration of Ti atoms through the Al-rich matrix to the surface layer of cBN, thus accelerating the chemical interaction. At the highest pressure of 6 GPa, the hardness, flexural strength and fracture toughness of the samples achieved their maximum values: 3719 Hv, 1090 MPa, and 7.6 MPa.m^1/2, respectively. Additionally, the material exhibits excellent cutting properties. Crack bridging, crack deflection, particle pullout and transgranular fracture were observed during the fracture process of the samples. Indicating strong interfacial bonding between cBN and the binder, which contributes to the material's enhanced toughness.

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合成压力对 PcBN 复合材料性能的影响

以 TiC、Al 和 Ti 为粘合剂，在高温高压（HPHT）条件下合成了多晶立方氮化硼（PcBN）复合材料。本研究探讨了不同合成压力对 PcBN 复合材料的微观结构、界面结合、致密化和机械性能的影响。测试结果表明，随着合成压力的增加，铝和钛元素向 cBN 颗粒表面的扩散增强。这促进了 Ti 原子通过富铝基体迁移到 cBN 表层，从而加速了化学作用。在 6 GPa 的最高压力下，样品的硬度、抗弯强度和断裂韧性都达到了最大值：分别为 3719 Hv、1090 MPa 和 7.6 MPa.m1/2。此外，该材料还具有优异的切削性能。在样品的断裂过程中，观察到了裂纹桥接、裂纹偏转、颗粒拉出和跨晶断裂。这表明 cBN 与粘结剂之间的界面结合力很强，有助于增强材料的韧性。

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来源期刊

Diamond and Related Materials 工程技术-材料科学：综合

CiteScore

6.00

自引率

14.60%

发文量

702

审稿时长

2.1 months

期刊介绍： DRM is a leading international journal that publishes new fundamental and applied research on all forms of diamond, the integration of diamond with other advanced materials and development of technologies exploiting diamond. The synthesis, characterization and processing of single crystal diamond, polycrystalline films, nanodiamond powders and heterostructures with other advanced materials are encouraged topics for technical and review articles. In addition to diamond, the journal publishes manuscripts on the synthesis, characterization and application of other related materials including diamond-like carbons, carbon nanotubes, graphene, and boron and carbon nitrides. Articles are sought on the chemical functionalization of diamond and related materials as well as their use in electrochemistry, energy storage and conversion, chemical and biological sensing, imaging, thermal management, photonic and quantum applications, electron emission and electronic devices. The International Conference on Diamond and Carbon Materials has evolved into the largest and most well attended forum in the field of diamond, providing a forum to showcase the latest results in the science and technology of diamond and other carbon materials such as carbon nanotubes, graphene, and diamond-like carbon. Run annually in association with Diamond and Related Materials the conference provides junior and established researchers the opportunity to exchange the latest results ranging from fundamental physical and chemical concepts to applied research focusing on the next generation carbon-based devices.