Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Microstructure and mechanical properties of hot-pressed ZrB2–SiC–ZrO2f ceramics with different sintering temperatures
Highlights ► The effect of different sintering temperatures was investigated. ► Zirconia fiber was used as reinforcing phase in ZrB2–SiC ceramics for the first time. ► Zirconia fibers were instable in ZrB2–SiC matrix above 1900°C and degenerated into particles. ► The optimal sintering temperature should be 1850°C.
Abstract Effect of the hot-pressing temperature (1750–1950°C) on the microstructure and mechanical properties of the hot-pressed ZrB2–SiC–ZrO2f ceramics was investigated in detail. It was indicated that when the hot-pressing temperature was above 1900°C, ZrO2 fibers were instable in ZrB2–SiC matrix which would degenerate into particles and the grain size of ZrO2 particles was bigger than the upper critical grain size so that the phase transformation of tetragonal to monoclinic phase would occur spontaneously during cooling process. The optimal hot-pressing temperature for this material system should be 1850°C to obtain high performance of the ZrB2–SiC–ZrO2f ceramics. The flexural strength and fracture toughness were enhanced to 1086±79MPa and 6.9±0.4MPam1/2, respectively. The toughness mechanism was mainly attributed to densification, phase transformation toughening, crack deflection, fibers fracture, fibers pull-out and fibers debonding.
Microstructure and mechanical properties of hot-pressed ZrB2–SiC–ZrO2f ceramics with different sintering temperatures
Highlights ► The effect of different sintering temperatures was investigated. ► Zirconia fiber was used as reinforcing phase in ZrB2–SiC ceramics for the first time. ► Zirconia fibers were instable in ZrB2–SiC matrix above 1900°C and degenerated into particles. ► The optimal sintering temperature should be 1850°C.
Abstract Effect of the hot-pressing temperature (1750–1950°C) on the microstructure and mechanical properties of the hot-pressed ZrB2–SiC–ZrO2f ceramics was investigated in detail. It was indicated that when the hot-pressing temperature was above 1900°C, ZrO2 fibers were instable in ZrB2–SiC matrix which would degenerate into particles and the grain size of ZrO2 particles was bigger than the upper critical grain size so that the phase transformation of tetragonal to monoclinic phase would occur spontaneously during cooling process. The optimal hot-pressing temperature for this material system should be 1850°C to obtain high performance of the ZrB2–SiC–ZrO2f ceramics. The flexural strength and fracture toughness were enhanced to 1086±79MPa and 6.9±0.4MPam1/2, respectively. The toughness mechanism was mainly attributed to densification, phase transformation toughening, crack deflection, fibers fracture, fibers pull-out and fibers debonding.
Microstructure and mechanical properties of hot-pressed ZrB2–SiC–ZrO2f ceramics with different sintering temperatures
Jia, Lin (Autor:in) / Xinghong, Zhang (Autor:in) / Zhi, Wang (Autor:in) / Wenbo, Han (Autor:in) / Hua, Jin (Autor:in)
09.07.2011
4 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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