Effects of Y2O3–RE2O3 (RE = Sm, Gd, Lu) additives on electrical and mechanical properties of SiC ceramics containing Ti2CN. Issue 12 (September 2016)

• Record Type: Journal Article
• Authors: Jang, Seung Hoon; Kim, Young-Wook; Kim, Kwang Joo
• Is Part Of: Journal of the European Ceramic Society. Volume 36:Issue 12(2016:)
• Page Start: 2997
• Page End: 3003
• Publication Date: 2016-09
• Subjects: SiC -- Electrical properties -- Mechanical properties -- Ti2CN; 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.2015.09.042
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Dense SiC–Ti2 CN composites were fabricated from β-SiC and 4 vol% TiN powders with 2 vol% equimolar Y2 O3 –RE2 O3 (RE = Sm, Gd, Lu) additives by conventional hot pressing. Electrical and mechanical properties of the SiC–Ti2 CN composites were investigated with a variation of sintering additive composition. Relative densities of ∼99.9% were achieved for all specimens. All specimens exhibited electrical resistivities on the order of ∼10 −5 Ω m. These low electrical resistivities were attributed to heavy nitrogen doping in the SiC lattice (carrier density ∼10 20 cm −3 ). Typical electrical resistivity, flexural strength, fracture toughness, and Vickers hardness values of the SiC–Ti2 CN composite sintered with 2 vol% Y2 O3 –Lu2 O3 additives were 2.2 × 10 −5 Ω m, 722 MPa, 4.6 MPa m 1/2, and 25 GPa, respectively.