Spark Plasma Sintering of Ceramic Matrix Composite of ZrB 2 and TiB 2 : Microstructure, Densification, and Mechanical Pr
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Spark Plasma Sintering of Ceramic Matrix Composite of ZrB2 and TiB2: Microstructure, Densification, and Mechanical Properties—A Review S. D. Oguntuyi1 · O. T. Johnson2,3 · M. B. Shongwe1 Received: 18 July 2020 / Accepted: 2 September 2020 © The Korean Institute of Metals and Materials 2020
Abstract The relentless effort for the innovation of improved materials for application in high-temperature environment, structural and functional application has paved the way for the synthesis of ceramics based materials—with current research activities being channeled towards the application of metallic and non-metallic based nano-powders as a sintering additive or as a reinforcement for ceramic-based materials. Metallic and non-metallic based nanopowders additive possesses excellent thermal, physical, and mechanical properties and hence, serves as a good additive for ceramic-based materials in achieving good sinterability, full densification, and excellent mechanical properties. One of the critical factors that have affected the densification and properties of the ceramic-based material is the type of consolidation applied. Powder metallurgy (PM) is the most prominent technique to date for the syntheses of ceramic-based materials. Although previous reviews have stated diverse PM techniques viz., hot press, hot-isostatic press, pressureless sintering, spark plasma sintering (SPS). More also, various reinforcement such as Metallic and non-metallic based nano-powders additive has been used in achieving the desired properties. SPS amidst diverse PM techniques has been given high attention to the routes of manufacturing ceramic materials because good microstructures and excellent mechanical properties can be achieved. This review focuses on past, present, and future works of ZrB2, and TiB2, reinforced with sintering additive with more attention on silicides, carbides, or nitrides based material as sintering additive. Keywords SPS · ZrB2 · TiB2 · Microstructure · Densification · Mechanical properties
1 Introduction ZrB2 and T iB2 are among the materials known as ultrahigh temperature ceramic (UHTC), possessing a melting points greater than 3000 °C and hence, appropriate for structural applications whose temperature is greater than 2000 °C because ZrB2 and TiB2 possess a melting point * S. D. Oguntuyi [email protected] 1
Department of Chemical, Metallurgical and Materials Engineering, Institute for Nano‑Engineering Research, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa
2
Department of Mining and Metallurgical Engineering, University of Namibia, Private Bag 13301, Ongwediva, Namibia
3
Department of Metallurgy, School of Mining, Metallurgy and Chemical Engineering, Faculty of Engineering and the Built Environment, University of Johannesburg, PO Box 524, Johannesburg, South Africa
of 3200 °C and 3225 °C respectively [1–4]. These ceramic materials have high competency to be applied in severe environmental circumstances such as aerospace, grinding and cutting tools, nu
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