Molybdenum as a new binder for polycrystalline diamond (PCD) prepared by HPHT sintering

• Published in: Ceramics international Vol. 49; no. 11; pp. 17313 - 17322
• Main Authors: Laurindo, Quézia Manuela Gonçalves, Rosa, Joice Medeiros Borges, da Silva Guimarães, Renan, Lugon, Rafael Delorence, Xing, Yutao, Lima, Ludiane Silva, Filgueira, Marcello
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.06.2023
• Subjects: High Pressure–High temperature (HPHT) sintering; Microstructure; Molybdenum binder; Polycrystalline diamond (PCD); Raman spectra; XRD; Polycrystalline diamond (PCD); Raman spectra; XRD; Microstructure; High Pressure–High temperature (HPHT) sintering; Molybdenum binder
• ISSN: 0272-8842; 1873-3956
• DOI: 10.1016/j.ceramint.2023.02.098

In this study, molybdenum was used as a binder to prepare sintered polycrystalline diamond (PCD) produced by HPHT technology. The effect of molybdenum as a binder on the comprehensive properties of the PCD was investigated at different temperatures. A detailed characterization of the produced materials demonstrates that molybdenum reacted nearly completely with the carbon of the diamond to form a hybrid matrix (Mo/MoC/Mo2C). Microstructural images of the composites evidence a homogeneous distribution of the binder phase and a preserved integrity of the constitutive particles. Based on Raman spectroscopy data, the proximity between the coefficients of thermal expansion (Mo/Diamond) helped maintain composites with a high-quality factor. Regarding the variation in experimental conditions, the increase in temperature was conducive to achieving composites with higher microstructural contiguity. From these results, it can be inferred that molybdenum may be a prospective alternative to be employed as a binding phase in producing well-sintered PCDs.