Indexed by:Journal Article

Date of Publication:2018-12-15

Journal:CERAMICS INTERNATIONAL

Included Journals:Scopus、SCIE

Volume:44

Issue:18

Page Number:22045-22052

ISSN:0272-8842

Key Words:Detonation sintering; Alumina-bonded polycrystalline diamond; Microstructural features; Thermal stability

Abstract:In this work, alumina-bonded nano-polycrystalline diamond (NPD) was synthesized by detonation sintering in the temperature range of 3000-3500 K and pressure range of 15-25 GPa. The microstructures and thermal stability of the NPD detonation sintered at 3255.05 K and 24.51 GPa were studied, and are described herein. Transmission electron microscopy and electron diffraction revealed that the polycrystalline diamond has a unique formation process and no graphitization. Scanning electron microscopy indicated that the size of polycrystalline particles increased in samples 2, 3, and 4. And thermogravimetric analysis indicated that the thermal stability of the diamond particles was enhanced. The 18% mass loss of specimen corresponded to the oxidation and decomposition of the amorphous carbon and carbon-containing compounds synthesized by detonation. Finally, graphitization calculations showed that the graphitization probability of polycrystalline diamond produced at the temperature of 3255.05 K and pressure of 24.51 GPa was 15.04%.