Model Representations of the Process of Structure Formation of Polycrystalline Superhard Material with a Bimodal Structure Based on Modified Diamond Powders

• Main Authors: Victor I. Zhornik, Alexander M. Parnitsky, Vladimir T. Senyut
• Format: Article
• Language: English
• Published: National Academy of Sciences of Belarus, State Scientific Institution “The Joint Institute of Mechanical Engineering" 2018-09-01
• Series: Механика машин, механизмов и материалов
• Subjects: physical model; diamond micro- and nanopowders; modification; thermobaric treatment; bimodal structure
• Online Access: http://mmmm.by/en/readers-en/archive-room-en?layout=edit&id=1398

A physical model of the process of structure formation of a polycrystalline superhard material is presented with a bimodal structure based on diamond micro- and nanopowders after their preliminary modification by carbide-forming elements. Proposed model representations of the processes of structure formation in diamond compacts make it possible to understand the mechanism of formation of their internal structure and forecast the level of the provided physical and mechanical properties. It is shown that during the thermobaric sintering of diamond powders modified by silicon and boron, a high-density superhard polycrystalline material is formed, which consists of grains of diamond micropowder, along the edges of which a binder is formed on the basis of boron and silicon carbides and is hardened with nanodiamond particles.