Flash spark plasma sintering of HfB2 ceramics without pre-sintering. (November 2018)

• Record Type: Journal Article
• Authors: Zou, Ji; Grasso, Salvatore; Liu, Lei-Feng; Ma, Hai-Bin; Reece, Mike; Binner, Jon
• Is Part Of: Scripta materialia. Number 156(2018)
• Page Start: 115
• Page End: 119
• Publication Date: 2018-11
• Subjects: Borides -- Flash spark plasma sintering -- Sintering -- Microstructure; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2018.07.026
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Strong HfB2 powder green bodies with compressive strengths exceeding 20 MPa have been produced by incorporating 1 wt% of glassy carbon derived from a pyrolyzed phenolic resin binder. Starting from the green body after debinding in argon, non-textured HfB2 ceramics (diameter ~ 20 mm and height ~ 4 mm) with a relative density of 95.1% were achieved using flash spark plasma sintering (FSPS) with a discharge time of 20 s, peak power of 19 kW and applied pressure of ~16 MPa. The lack of a need for a pre-sintering step resulted in energy savings compared to the densification of HfB2 ceramics by FSPS. Graphical abstract: Unlabelled Image