Preparation and property study on PCBN carcass implanted diamond composites
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摘要: 在5~6 GPa、1400~1500℃、保温5 min的条件下,以立方氮化硼粉末、多种黏结剂、镀钛金刚石颗粒混合制备出金刚石复合材料。通过扫描电镜(SEM)、X射线衍射仪(XRD)、能谱分析仪(EDS)、拉曼分析仪(Raman光谱)以及耐磨性、显微硬度的测试设备等,对材料的组织形貌、物相成分、界面结合情况、力学性能等进行分析。实验结果表明:金刚石颗粒良好地分布在立方氮化硼基体中,两者界面结合牢固;在界面处生成的TiB2、TiC、AlN等陶瓷硬质相可提高复合材料的磨耗比、显微硬度、抗冲击韧性等物理力学特性。新材料的磨耗比相比于传统材料提高了37.64倍,维氏硬度大于40 GPa(加载力10 N),致密度达97%以上,耐热性达到1148℃,相比于传统PDC复合片的耐热性提高了28%~64%。Abstract: Under the conditions of 5 to 6 GPa, 1400 to 1500℃, holding for 5 minutes, diamond composite material was prepared by mixing cubic boron nitride powder, various binders, and titanium-coated diamond particles. Scanning electron microscopy (SEM), X-ray diffractometer (XRD), energy dispersive spectrometer (EDS) and Raman spectrometer were used to character the microstructure and phase composition, Its wear resistance and microhardness were tested by mechanical tests. Results show that the diamond particles are well distributed in the cubic boron nitride matrix, with well-bonded interface. There are many kinds of carbides and nitrides at the interface, such as TiB2, TiC, and AlN which makes the material exhibit excellent physical and mechanical properties. The abrasion ratio of the composite is 37.64 times higher than that of traditional material, microhardness greater than 40 GPa, density of more than 97%, and the heat resistant up to 1148℃, which is 28% to 64% higher than traditional PDC composite.
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Key words:
- high-pressure and high-temperature /
- PCBN /
- diamond compression /
- heat resistant
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