Colloidal Processing of Zirconium Diboride Ultra-High Temperature Ceramics

2013 ◽  
Vol 96 (8) ◽  
pp. 2374-2381 ◽  
Author(s):  
Carolina Tallon ◽  
Dorji Chavara ◽  
Andrew Gillen ◽  
Daniel Riley ◽  
Lyndon Edwards ◽  
...  
Keyword(s):  
High Temperature ◽  
Zirconium Diboride ◽  
Colloidal Processing ◽  
Ultra High Temperature Ceramics ◽  
Ultra High Temperature

scholarly journals Fracture mechanisms of zirconium diboride ultra-high temperature ceramics under pulse loading

2017 ◽  
Author(s):  
Vladimir V. Skripnyak ◽  
Anatoly M. Bragov ◽  
Vladimir A. Skripnyak ◽  
Andrey K. Lomunov ◽  
Evgeniya G. Skripnyak ◽  
...  
Keyword(s):  
High Temperature ◽  
Zirconium Diboride ◽  
Pulse Loading ◽  
Fracture Mechanisms ◽  
Ultra High Temperature Ceramics ◽  
Ultra High Temperature

Pressureless Sintering of ZrB2 with β-SiC Addition

2015 ◽  
Vol 820 ◽  
pp. 250-255 ◽  
Author(s):  
Mariah Oliveira Juliani ◽  
Carolyne Davi Oliveria ◽  
Rosa Maria Rocha
Keyword(s):  
Silicon Carbide ◽  
High Temperature ◽  
Zirconium Diboride ◽  
Theoretical Density ◽  
Pressureless Sintering ◽  
Ultra High Temperature Ceramics ◽  
Ultra High Temperature

Zirconium diboride (ZrB2) is a covalent compound that leads the category of ultra high temperature ceramics materials owing to its unique properties. In this work, the effect of addition of beta-silicon carbide (β-SiC) in pressureless sintering of ZrB2 was investigated. Four compositions were prepared with 0, 10, 20 e 30 vol% of SiC. ZrB2 powder and mixtures were prepared in by planetary milling with SiC spheres at 4 h. Two sintering temperatures were used, one at 2050 oC/1h and other at 2150 °C/1h. The addition of SiC has promoted an increasing in densification with the increasing of SiC content. The total densification of sample sintered at 2050 oC was 90% of theoretical density for sample with 30 vol% of SiC, while the maximum densification for temperature of 2150 oC was 91,0 %TD.

Liquid Oxide Flow during Oxidation of Zirconium Diboride-Silicon Carbide Ultra High Temperature Ceramics

2010 ◽  
Vol 434-435 ◽  
pp. 144-148 ◽  
Author(s):  
Sindhura Gangireddy ◽  
Sigrun N. Karlsdottir ◽  
J.W. Halloran
Keyword(s):  
Silicon Carbide ◽  
High Temperature ◽  
Oxide Film ◽  
Boron Oxide ◽  
Zirconium Diboride ◽  
Ultra High Temperature Ceramics ◽  
Liquid Oxide ◽  
Film Microstructure ◽  
Ultra High Temperature

Recent ideas on the oxidation of ZrB2-SiC are presented, emphasizing the behavior of the boria-silica-zirconia liquid (BSZ liquid) which forms during oxidation and flows to transport silica and zirconia to the surface of the scale. Oxide film microstructure is strongly influenced by the boron oxide, which acts as a volatile flux.

The Numerical Simulation and Design of the Electrical Heating System for Electric Conductive Ultra-High-Temperature-Ceramics Test Specimen

2013 ◽  
Vol 676 ◽  
pp. 231-234
Author(s):  
Zong Yuan Zeng ◽  
Shao Li Wu
Keyword(s):  
High Temperature ◽  
Zirconium Diboride ◽  
Electrical Current ◽  
Experimental Period ◽  
Heating System ◽  
Electrical Heating ◽  
Space Vehicles ◽  
Ultra High Temperature Ceramics ◽  
Copper Electrodes ◽  
Ultra High Temperature

Serving as an important thermal segregation material for air and space vehicles, zirconium diboride has to suffer ultra-high-temperature that might be over 2700°C. However, the highest working temperature we can achieve for the testing of the mechanical properties of such kind of materials is less than 1500 °C. Moreover, the high temperature furnaces are low-usage, and have along experimental period. Making use of the satisfactory electrical and thermal conductivities, we could heat a Zirconium diboride specimen with electrical current. The electrical heating of a Zirconium diboride specimen is simulated with the commercial available finite element code ABAQUS. The temperature and cooling of copper electrodes and that of collets, is also analyzed, and the temperature distributions are obtained. In order to achieve reasonable distribution of temperature in the specimen, the copper electrodes and the collets, the corresponding cooling facilities is designed, and the cooling liquids are selected.

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