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Effects of sintering velocity on the microstructure and mechanical properties of hot-pressed ZrB2–SiC–ZrO2f ceramics
Highlights ► Zirconia fiber was firstly used as reinforcing phase in ZrB2–SiC ceramics. ► Suitable sintering velocities could reduce the stress concentration during sintering process. ► The flexural strength and fracture toughness were enhanced to 1117±98MPa and 7.1±0.5MPam1/2. ► Toughening mechanisms are due to fiber debonding, pull-out and transformation toughening.
Abstract The effects of cooling and heating velocity on the microstructure and mechanical properties of the hot-pressed ZrB2–20vol.% SiC ceramics added with 15vol.% Zirconia fiber were investigated in details. It was indicated that the appropriate cooling velocity could reduce the residual stress concentration, and the proper heating velocity could allowed the green compacts to get densified, which was favorable to enhance the flexural strength and fracture toughness to 1117±98MPa and 7.1±0.5MPam1/2, respectively. Due to the introduction of the Zirconia fiber, the observed toughening mechanisms were attributed to the fiber debonding, fiber pull-out and phase transformation toughening. The results presented here point out a promising way for improving the mechanical properties of ZrB2-based ultra-high temperature ceramics.
Effects of sintering velocity on the microstructure and mechanical properties of hot-pressed ZrB2–SiC–ZrO2f ceramics
Highlights ► Zirconia fiber was firstly used as reinforcing phase in ZrB2–SiC ceramics. ► Suitable sintering velocities could reduce the stress concentration during sintering process. ► The flexural strength and fracture toughness were enhanced to 1117±98MPa and 7.1±0.5MPam1/2. ► Toughening mechanisms are due to fiber debonding, pull-out and transformation toughening.
Abstract The effects of cooling and heating velocity on the microstructure and mechanical properties of the hot-pressed ZrB2–20vol.% SiC ceramics added with 15vol.% Zirconia fiber were investigated in details. It was indicated that the appropriate cooling velocity could reduce the residual stress concentration, and the proper heating velocity could allowed the green compacts to get densified, which was favorable to enhance the flexural strength and fracture toughness to 1117±98MPa and 7.1±0.5MPam1/2, respectively. Due to the introduction of the Zirconia fiber, the observed toughening mechanisms were attributed to the fiber debonding, fiber pull-out and phase transformation toughening. The results presented here point out a promising way for improving the mechanical properties of ZrB2-based ultra-high temperature ceramics.
Effects of sintering velocity on the microstructure and mechanical properties of hot-pressed ZrB2–SiC–ZrO2f ceramics
Lin, Jia (author) / Zhang, Xinghong (author) / Dong, Shun (author) / Yang, Yang (author) / Han, Wenbo (author) / Jin, Hua (author)
2013-02-09
6 pages
Article (Journal)
Electronic Resource
English
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