Research on the Performance of SiAlON-Graphite-SiC Composites

2011 ◽  
Vol 284-286 ◽  
pp. 73-77
Author(s):  
Wen Wu Wang ◽  
Hui Yan Cao ◽  
Zhi Ping Zhang ◽  
Jing Xiang Wang
Keyword(s):  
Blast Furnace ◽  
Thermal Shock Resistance ◽  
Fine Powder ◽  
Silicon Powder ◽  
Alkali Resistance ◽  
Flake Graphite ◽  
Shock Resistance ◽  
Composition Structure ◽  
And Performance ◽  
Sic Composites

Based on SiC grains and powder, flake graphite, AlN powder, Silicon powder, sintered alumina ultra-fine powder as the starting materials, the sample of SiAlON-Graphite-SiC composites was prepared by firing under N2 atmosphere at 1 550°C and then analyzed in terms of high temperature performances by XRD, SEM and EDAX etc. The interrelation between composition, structure and performance of the material was also investigated. It indicates that this material provides excellent thermal shock resistance and molten alkali resistance, also proper oxidation resistance and applicable as the inner lining of the blast furnace.

Effect of Additives and Carbon Resources on Thermal Shock Resistance of Spinel-C Material

2017 ◽  
Vol 726 ◽  
pp. 440-444 ◽  
Author(s):  
Zheng Wei ◽  
Guo Qi Liu ◽  
Jin Song Yang
Keyword(s):  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Expanded Graphite ◽  
Silicon Powder ◽  
Particle Sizes ◽  
Flake Graphite ◽  
Good Corrosion Resistance ◽  
Effect Of Additives ◽  
Shock Resistance ◽  
Quenching Method

Spinel-C material is important for monolithic stopper and submerged nozzle, which usually determine the application effects. Spinel-C specimens with 8% flake graphite is characterized by good corrosion resistance but poor thermal shock resistance. The effects of additives (Al-Si alloy, silicon powder, B4C and SiC), flake graphite (+199/-199), ultrafine flake graphite, expanded graphite and nickel nitrate + pitch powder on thermal shock resistance of spinel-C material were investigated by using water-quenching method. The results show that: (1) The addition of Al-Si alloy and B4C can significantly decrease the residual strength ratios (RSR) of the specimens. The addition of SiC and silicon powder can improve the RSR obviously. (2) The flake graphite of different particle sizes has little effect on the RSR of the specimens. With the increasing of the expanded graphite content, the RSR of the specimens increases. (3) The addition of mesophase pitch and Carboresâ P can receive the RSR rise of 74% and 59% respectively.

Preparation and Performance of β-Sialon Bonded ZrO2 Composites

2011 ◽  
Vol 415-417 ◽  
pp. 138-141
Author(s):  
Rui Sheng Wang ◽  
Jun Hong Zhao ◽  
Ying Na Wei ◽  
Fu Hua Peng ◽  
Heng Yong Wei
Keyword(s):  
Thermal Expansion ◽  
Flexural Strength ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Reaction Sintering ◽  
Sintering Process ◽  
Carbon Addition ◽  
Shock Resistance ◽  
And Performance ◽  
Sialon Powder

β-Sialon bonded ZrO2 composites were prepared by reaction sintering process using β-Sialon and CaO stabilized ZrO2 powders as raw materials.The effect of β-Sialon powder additions on the properties of the composites was investigated. The results show that the samples with 10 wt% of β-Sialon addition had the lowest apparent porosity (29.80%) and the highest of flexural strength (68.70MPa). The thermal shock resistance in carbon addition of the composites could be improved by addtion of 5wt% β-Sialon. It may be relative with that the sample had the lowest thermal expansion coefficient in vacuum.

Excellent thermal shock resistance of Al alloy-infiltrated SiC composites

2019 ◽  
Vol 269 ◽  
pp. 16-25 ◽  
Author(s):  
Wei Wang ◽  
Qiang Li ◽  
An Du ◽  
Xue Zhao ◽  
Yongzhe Fan ◽  
...  
Keyword(s):  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Al Alloy ◽  
Shock Resistance ◽  
Sic Composites

Microstructure and Thermal Shock Resistance of ZrB2 and ZrB2-20vol% SiC Composites from Aqueous Tape Casting

2011 ◽  
Vol 26 (3) ◽  
pp. 244-248 ◽  
Author(s):  
Zhi-Hui LÜ ◽  
Dong-Liang JIANG ◽  
Jing-Xian ZHANG ◽  
Qing-Ling LIN ◽  
Zheng-Ren HUANG
Keyword(s):  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Tape Casting ◽  
Shock Resistance ◽  
Sic Composites

Study on High Performance Fe3Si-Si3N4-SiC Composite Preparation and its Application in Blast Furnace

2011 ◽  
Vol 194-196 ◽  
pp. 1547-1553 ◽  
Author(s):  
Yong Li ◽  
Xiao Yan Zhu ◽  
Ya Wei Zhai ◽  
Jia Ping Wang ◽  
Wen Dong Xue ◽  
...  
Keyword(s):  
Blast Furnace ◽  
High Performance ◽  
Furnace Operation ◽  
Alkali Resistance ◽  
Chemical Thermodynamics ◽  
Alloy Addition ◽  
Plastic Phase ◽  
Sic Composites ◽  
Addition Amount ◽  
Comprehensive Property

Excellent Fe3Si-Si3N4-SiC composites were successfully prepared with FeSi75 and SiC as main starting materials by nitridation reaction(at 1300°C for 8Hrs). The effect of ferrosilicon alloy addition amount on material properties was studied; the ferrosilicon nitridation mechanism was analyzed through chemical thermodynamics; phase composition, microstructure, alkali resistance of products were also investigated. The results show that when ferrosilicon addition amount is 12wt%, the comprehensive property of Fe3Si-Si3N4-SiC is the best. The nitridation products are fiber-like α-Si3N4 and rod-like β-Si3N4, which makes better mechanical behavior due to fiber reinforcement; a great deal of Fe3Si intermetallic compounds uniformly distribute in matrix, which is one of the products of Fe-Si nitridation and as a plastic phase forming in grain boundary optimizes the performance of products. Chemical thermodynamic analysis shows that the fiber-like α-Si3N4 is formed by SiO(g) and N2(g) reaction which also increases the rate of nitridation. Fe3Si-Si3N4-SiC material has good performance. Now it has been successfully applied to one 2000M3 domestic steel plant, the blast furnace operation goes well.

Research of Thermal Shock Resistance of Si3N4 and SiC

2012 ◽  
Vol 549 ◽  
pp. 691-694
Author(s):  
Fang Zhang ◽  
Zhi Liang Huang
Keyword(s):  
Bulk Density ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Bending Strength ◽  
Sintering Temperature ◽  
Silicon Powder ◽  
Nitrogen Atmosphere ◽  
Production Practice ◽  
Shock Resistance ◽  
Powder Content

The study is carried out combing with the production practice in Danjiangkou Hongyuan SiC limited. Si3N4 and SiC were prepared successfully from SiC and Silicon power in nitrogen atmosphere at 1425°C and 1375°C sintering temperature by the serial of techniques, such as ingredients, mixing, molding and drying, respectively. In the actual production, silicon powder content and sintering temperature will directly influence the products of the bending strength and thermal shock resistance. By measuring bending strength, porosities, bulk density, XRD and FESEM, the bending strength and thermal shock resistance of samples were studied mainly by changing sintering temperature and silicon powder content. The results show that bending strength and thermal shock resistance of sample which was added 16% Si powder is best. And bending strength and thermal shock resistance of sample of 1425°C sintering temperature is higher than that of 1375°C sintering temperature.

Influence of Z Value and Sintering Temperature on Properties of β-Sialon Bonded Corundum Composite

2011 ◽  
Vol 287-290 ◽  
pp. 183-187 ◽  
Author(s):  
Yu Xiang Guo ◽  
Dian Li Qu ◽  
Yan Fen Sun ◽  
Sheng Xin Zhang
Keyword(s):  
Sintering Temperature ◽  
Raw Materials ◽  
Fine Powder ◽  
Silicon Powder ◽  
Nitrogen Atmosphere ◽  
Comprehensive Properties ◽  
Oxidation Performance ◽  
Shock Resistance ◽  
Z Value

Using corundum particles and fine powder, α-Al2O3 powder, silicon powder, aluminum powder and some additives as raw materials, β-Sialon bonded corundum composite was synthesized in-situ at the nitrogen atmosphere. The influence of Z value in sialon phase and sintering temperature on physical properties, mechanical properties, thermal shock resistance and anti-oxidation performance of β-Sialon bonded corundum composite was investigated. The results indicate that the comprehensive properties of β-Sialon bonded corundum composite is excellent on condition that Z=2.75, sintering temperature is 1500°C at nitrogen atmosphere.

Mathematical Simulation and Optimization of Structure and Performance of Air Way of Purging Plug in Ladle

2014 ◽  
Vol 997 ◽  
pp. 565-569 ◽  
Author(s):  
Wen Gang Yang ◽  
Guo Qi Liu ◽  
Feng Ling Yang ◽  
Tian Fei Ma
Keyword(s):  
Thermal Stress ◽  
Tensile Stress ◽  
Thermal Shock Resistance ◽  
Field Tests ◽  
Axial Direction ◽  
Optimum Structure ◽  
Simulation And Optimization ◽  
Circular Slit ◽  
Shock Resistance ◽  
And Performance

The temperature and thermal stress of different air ways of purging plug were comparatively analyzed by means of finite element method. Combined with the physical properties of the air ways of purging plug, a set of field tests were carried out for the optimum structure. The results showed that the structure of air ways of purging plug had great impact on the thermal stress. In service process, the damage of the air way was mainly caused by tensile stress in axial direction. By evenly distributes the tensile stress in axial direction, the stress decreased by 40% compared with the original one, and thermal shock resistance of purging plug D with circular slit structure has been improved and also proved in the field test.

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