Microstructure and flexural strength of hafnium diboride via flash and conventional spark plasma sintering. Issue 4 (April 2019)

• Record Type: Journal Article
• Authors: Demirskyi, D.; Suzuki, T.S.; Grasso, S.; Vasylkiv, O.
• Is Part Of: Journal of the European Ceramic Society. Volume 39:Issue 4(2019)
• Page Start: 898
• Page End: 906
• Publication Date: 2019-04
• Subjects: Hafnium diboride -- Flash sintering -- Flexural strength -- High temperature materials; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2018.12.012
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Microstructure evolution in bulk hafnium diboride ceramics prepared by spark plasma sintering in flash regime was compared with conventional spark plasma sintering. The conventional and flash spark plasma sintering resulted in ceramics with a high relative density exceeding 96% of their theoretical density. A remarkably fine grain size distribution was noticed for the specimen prepared in the flash regime. This atypical microstructure evolution provides a possible insight into the mechanism of flash sintering for conductive bulks. The room temperature flexural strength of the hafnium diboride processed by flash SPS was 650 MPa which is 140 MPa higher than the sample produced by conventional SPS.