Hardness and thermal stability enhancement of polycrystalline diamond compact through additive hexagonal boron nitride. (May 2018)

• Record Type: Journal Article
• Authors: Liu, Yinjuan; He, Duanwei; Kou, Zili; Liu, Fangming; Wang, Pei; Hu, Qiwei; Liang, Akun
• Is Part Of: Scripta materialia. Number 149(2018)
• Page Start: 1
• Page End: 5
• Publication Date: 2018-05
• Subjects: Diamond -- Thermal stability -- Hardness -- Boron nitride -- Grain boundary strengthening; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2018.01.034
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Hexagonal boron nitride (hBN) was used as the additive in improving the hardness and thermal stability of polycrystalline diamond compact under high temperature and high pressure. Indentation testing on diamond/cubic boron nitride (cBN) composites indicated a Vickers hardness of 96 ± 7 GPa, rivaling the hardness of monocrystal diamond. Thermal gravimetric analysis (TGA) suggested that the composites of diamond/cBN are thermally stable in air up to ∼910 °C which is higher than that of pure polycrystalline diamond compact (∼750 °C). Raman, TGA, x-ray photoelectron spectroscopic and microstructure analyses all revealed the features of diamond/cBN composition beyond both diamond and cBN. Graphical abstract: Unlabelled Image