Pressureless Sintering of B4C-SiC Composites for Armor Applications

2010 ◽  
pp. 113-119 ◽  
Author(s):  
Rosa Maria da Rocha ◽  
Francisco C. L. de Melo
Keyword(s):  
Pressureless Sintering ◽  
Sic Composites

Effects of HfB2 addition on pressureless sintering behavior and microstructure of ZrB2-SiC composites

2021 ◽  
Vol 94 ◽  
pp. 105371 ◽  
Author(s):  
Shahabeddin Jafari ◽  
Mohammad Bavand-Vandchali ◽  
Mehri Mashhadi ◽  
Ali Nemati
Keyword(s):  
Sintering Behavior ◽  
Pressureless Sintering ◽  
Sic Composites

Pressureless Sintering of Carbon Nanofibre/SiC Composites and Their Properties

2013 ◽  
Vol 11 (2) ◽  
pp. 280-288 ◽  
Author(s):  
Guosheng Xu ◽  
Tomohiko Yamakami ◽  
Tomohiro Yamaguchi ◽  
Morinobu Endo ◽  
Seiichi Taruta ◽  
...  
Keyword(s):  
Pressureless Sintering ◽  
Carbon Nanofibre ◽  
Sic Composites

Sintering of B4C-SiC Composites with ALN-Y2O3 Addition

2012 ◽  
Vol 727-728 ◽  
pp. 850-855
Author(s):  
Rosa Maria da Rocha ◽  
Francisco Cristóvão Lourenço de Melo
Keyword(s):  
Applied Pressure ◽  
Ceramic Composites ◽  
Argon Atmosphere ◽  
Pressureless Sintering ◽  
Sintering Aid ◽  
Suitable Material ◽  
Sic Ceramics ◽  
Sic Ceramic ◽  
Sic Composites ◽  
C 30

One suitable material candidate to improve B4C mechanical properties is SiC. B4C-SiC ceramic composites are very promising armor materials because B4C and SiC are intrinsically very hard. In this work a pressureless sintering study of B4C-SiC ceramics was made. B4C-SiC mixtures were prepared with SiC concentration from 10 to 50 wt%. Without the external applied pressure during sintering it was necessary to add sintering aid. The additive system AlN-Y2O3 was investigated as sintering aid. Samples were densified by pressureless sintering at 2000 °C/30 min in an argon atmosphere. B4C-SiC composites were analyzed by XRD and SEM. Bulk density and total weight loss were also measured. Density higher than 93 % of the theoretical value was determined and microhardness of 30.3 GPa was achieved for composite with 10 wt% of SiC sintered with AlN-Y2O3 additive.

Preparation and Thermal Properties of Pressureless Sintered AIN/SiC Composites

2015 ◽  
Vol 655 ◽  
pp. 78-81
Author(s):  
Shu He Ai ◽  
Yu Jun Zhang ◽  
Hong Yu Gong ◽  
Qi Song Li
Keyword(s):  
Thermal Conductivity ◽  
Mechanical Property ◽  
Thermal Properties ◽  
Flexural Strength ◽  
Relative Density ◽  
Sintering Temperature ◽  
Pressureless Sintering ◽  
Temperature Range ◽  
Sic Composites

AlN/SiC composites with 5 wt.% Y2O3addition were fabricated by pressureless sintering at 1700-1950 oC. The influences of sintering temperature and SiC content on the relative density, mechanical property and thermal conductivity were studied. With sintering temperature increasing from 1700 oC to 1750 oC, the relative density increased significantly to about 98.0%, without evident changes from 1750 oC to 1900 oC, and then decreased slightly at 1950 oC. As SiC content increased, the flexural strength of composites sintered at 1750 oC increased firstly, and then decreased, obtaining a maximum flexural strength of 337 MPa at 20 wt.% SiC content. Meanwhile, the thermal conductivity decreased from 60 W/(m∙K) to 40 W/(m∙K) with SiC content increasing from 0 wt.% to 30 wt.%. Moreover, in the sintering temperature range from 1750 oC to 1950 oC, the thermal conductivity increased from 45 W/(m∙K) to 55 W/(m∙K) for AlN-10 wt.% SiC composites, but decreased from 40 W/(m∙K) to 36 W/(m∙K) for AlN-30 wt.% SiC composites.

SiC-TiB2 Composite Densified by Pressureless Liquid-Phase Sintering

2013 ◽  
Vol 544 ◽  
pp. 48-51 ◽  
Author(s):  
Yu Hong Chen ◽  
Lan Er Wu ◽  
Wen Zhou Sun ◽  
Yong Jiang ◽  
You Jun Lu
Keyword(s):  
Mechanical Properties ◽  
Liquid Phase ◽  
Fracture Mechanism ◽  
Eutectic Point ◽  
Sintered Sample ◽  
Crack Deflection ◽  
Liquid Phase Sintering ◽  
Pressureless Sintering ◽  
Sintering Aids ◽  
Sic Composites

Particle reinforced SiC composites with the addition of TiB2 were fabricated in range of 1750°C to 1950°C by pressureless sintering by utilizing liquid phase with AlN-Y2O3 as sintering additives. The effective of sintering aids in densification, the mechanical properties of sintered sample and the microstructure had been investigated in this paper. The results showed that the best densification behaviors occurred in AlN:Y2O3 at 60 :40%mol ratio not at eutectic point. Adding TiB2 to SiC matrix increase the toughness and decreased the hardness. Microstructure analysis showed that the increasing of toughness was due to the crack deflection with some contribution intergranular fracture mechanism.

scholarly journals Effect of ZrB2 Particle Size on Pressureless Sintering of ZrB2 - ß-Sic Composites

2019 ◽  
Author(s):  
Rosa Maria da Rocha ◽  
Frank Ferrer Sene ◽  
Mariah de Oliveira Juliani ◽  
Caroline Oliveira Davi
Keyword(s):  
Particle Size ◽  
Flexural Strength ◽  
Average Particle Size ◽  
Theoretical Density ◽  
Average Particle ◽  
Pressureless Sintering ◽  
High Melting Temperature ◽  
Powder Samples ◽  
Effect Of Particle Size ◽  
Sic Composites

Zirconium diboride is an ultra high temperature ceramic material that leads this emerging class of materials because of its distinct combination of properties, including high melting temperature (> 3000 °C) and the lowest theoretical density (6.09 g·cm-3) among the borides. This combination of properties makes ZrB2 candidate for airframe leading edges on sharp-bodied reentry vehicles. In this work, the effect of particle size of ZrB2 on the pressureless sintering of ZrB2-SiC composites was studied, using ZrB2 powder with average particle size of 2.6 and 14.2µm. Four different vol% concentration of ß-SiC (0, 10, 20 and 30 vol%) were added to as-received and planetary milled ZrB2 powder. Samples were pressureless sintered at 2050 °C/1h in argon atmosphere. The reduction of initial ZrB2 particle size led to composites with better results of densification, mechanical properties and oxidation resistance regardless ß-SiC addition, showing relative densities around 92.5 %Theoretical Density (Td) and flexural strength and microhardness around 260 MPa and 17.5 GPa, respectively. Composites processed with as-received ZrB2 powder showed increasing in densification and flexural strength with the SiC content increasing. Relative density varied from 74.7 to 90.8 %TD and flexural strength from 102 to 241 MPa, for 0 and 30 vol% of SiC, respectively.

Pressureless sintering of AlN-SiC composites

1991 ◽  
Vol 26 (11) ◽  
pp. 2930-2936 ◽  
Author(s):  
Wen-Cheng J. Wei ◽  
Ran-Rong Lee
Keyword(s):  
Pressureless Sintering ◽  
Sic Composites
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