Microstructure and Mechanical Properties of ZrB&lt;sub&gt;2&lt;/sub&gt;-Based Ceramics

Zhang, Xing Hong; Hu, Ping; Meng, Sheng; Han, Jie Cai; Wang, Bao Lin

doi:10.4028/0-87849-994-6.287

Cited by 2 publications

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“…Since the ratio of ZrO 2 /Si is 4 in both 2.0 and 2M4, the small grain size in 2M4 can be attributed to decrease in Y 2 O 3 +Al 2 O 3 content from 7.36 in 2.0 composite to 2.0 wt% in 2M4 composite ( and Al 2 O 3 ), and product phases (ZrB 2 , SiC, and B 4 C), the reaction among them during synthesis and sintering is unknown. The densification mechanism may be controlled by dissolution-precipitation or evaporationcondensation [31]. During liquid phase sintering of YAG/ZrB 2 , a sintering temperature of 1600 ℃ is a critical temperature to form molten YAG and to achieve a full density [32].…”

Section: Resultsmentioning

confidence: 99%

ZrB2–SiC based composites for thermal protection by reaction sintering of ZrO2+B4C+Si

Krishnarao¹,

Bhanuprasad²,

Reddy³

2017

J Adv Ceram

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Synthesis and sintering of ZrB 2 -SiC based composites have been carried out in a single-step pressureless reaction sintering (PLRS) of ZrO 2 , B 4 C, and Si. Y 2 O 3 and Al 2 O 3 were used as sintering additives. The effect of ratios of ZrO 2 /B 4 C, ZrO 2 /Si, and sintering additives (Y 2 O 3 and Al 2 O 3 ), was studied by sintering at different temperatures between 1500 and 1680 ℃ in argon atmosphere. ZrB 2 , SiC, and YAG phases were identified in the sintered compacts. Density as high as 4.2 g/cm 3 , micro hardness of 12.7 GPa, and flexural strength of 117.6 MPa were obtained for PLRS composites. Filler material was also prepared by PLRS for tungsten inert gas (TIG) welding of the ZrB 2 -SiC based composites. The shear strength of the weld was 63.5 MPa. The PLRS ZrB 2 -SiC composites exhibited: (i) resistance to oxidation and thermal shock upon exposure to plasma flame at 2700 ℃ for 600 s, (ii) thermal protection for Cf-SiC composites upon exposure to oxy-propane flame at 2300 ℃ for 600 s.

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Section: Resultsmentioning

confidence: 99%

ZrB2–SiC based composites for thermal protection by reaction sintering of ZrO2+B4C+Si

Krishnarao¹,

Bhanuprasad²,

Reddy³

2017

J Adv Ceram

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“…Transition metal borides, specifically ZrB 2 and HfB 2 are of interest for aerospace applications because of their ultra-high melting temperature (>3000 • C), high hardness and strength, and high thermal and electrical conductivities [1]- [3]. They are candidates for high-speed aircraft leading edges, as well as for structural parts in high temperature environments.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Processing of Ultra-High Temperature Metal Carbide and Metal Diboride Nanocomposite Materials

Speyer¹

2008

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Microstructure and Mechanical Properties of ZrB<sub>2</sub>-Based Ceramics

Cited by 2 publications

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ZrB2–SiC based composites for thermal protection by reaction sintering of ZrO2+B4C+Si

ZrB2–SiC based composites for thermal protection by reaction sintering of ZrO2+B4C+Si

Synthesis and Processing of Ultra-High Temperature Metal Carbide and Metal Diboride Nanocomposite Materials

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