scholarly journals Core-Shell and Hollow Particles of Carbon and SiC Prepared from Hydrochar

Materials ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 1835
Author(s):  
Wenming Hao ◽  
Yongsheng Liu ◽  
Alexandra Neagu ◽  
Zoltan Bacsik ◽  
Cheuk-Wai Tai ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Core Shell ◽  
Lightweight Materials ◽  
Hollow Particles ◽  
Carbon Template ◽  
Sic Particles ◽  
Silicon Vapor ◽  
Shock Resistance

The applications of silicon carbide (SiC) include lightweight materials with thermal shock resistance. In this study, core-shell C-SiC particles were synthesized by compacting and rapidly heating a hydrochar from glucose by using strong pulsed currents and infiltration of silicon vapor. Hollow particles of SiC formed on removing the carbon template. In contrast to related studies, we detected not only the pure 3C polytype (β-SiC) but also significant amounts of the 2H or the 6H polytypes (α-SiC) in the SiC.

Thermal Shock Resistance of Liquid Phase Sintered SiC

2016 ◽  
Vol 881 ◽  
pp. 103-108
Author(s):  
Roberta Monteiro de Mello ◽  
Ana Helena de Almeida Bressiani
Keyword(s):  
Silicon Carbide ◽  
Liquid Phase ◽  
Thermal Shock ◽  
Water Samples ◽  
Thermal Cycle ◽  
Thermal Shock Resistance ◽  
Sintering Temperature ◽  
Shock Resistance

The aim of this study was to evaluate the effect of Y2O3:Al2O3 additives and sintering temperature on thermal shock resistance of silicon carbide sintered via liquid phase. Silicon carbide samples containing 10 mol% Y2O3:Al2O3 (1:3 and 1:4) were prepared, compacted and sintered at 1750, 1850 and 1950 °C in a graphite resistive furnace. Thermal shock resistance was evaluated after each thermal cycle performed at 600, 750 and 900 °C followed by abrupt cooling in water. Samples with two Y2O3:Al2O3 proportions did not show major differences when sintered at the same temperature, though, rising the sintering temperature improves Y2O3:Al2O3 modified-SiC thermal shock resistance.

Influence of Additives on Performance of Silicon Carbide Refractory

2012 ◽  
Vol 538-541 ◽  
pp. 2277-2280
Author(s):  
You Fu Guo ◽  
Ming Yue Zheng ◽  
Jing Long Bu ◽  
Yue Jun Chen ◽  
Li Xue Yu ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Thermal Expansion ◽  
Bulk Density ◽  
Thermal Shock ◽  
Silica Fume ◽  
Thermal Shock Resistance ◽  
Bending Strength ◽  
Carbide Refractory ◽  
Shock Resistance ◽  
Silicon Carbide Refractory

Silicon carbide with diffierent granularity was used as raw material, quartz, silica fume, aluminum powder or alumina was used as additive with dosages of 1% (in mass, similarly hereinafter), 3% and 5%. Silicon carbide refractory material was prepared in oxidizing atmosphere at 1400 °C for 3 h. Performence of samples were researched by measurements of apparent porosity, bulk density, bending strength at room temperature, thermal shock resistance and thermal expansion rate, and analyzed by SEM. The results showed that samples added silica fume have low thermal expansion rate and apparent porosity, high bending strength and bulk density, good thermal shock resistance, compact texture as well. It can be deduced that 5% silica fume plays the excellent role to improve integrated performance of silicon carbide refractory material.

Thermal shock resistance and hoop strength of triplex silicon carbide composite tubes

2017 ◽  
Vol 14 (6) ◽  
pp. 1069-1076 ◽  
Author(s):  
Daejong Kim ◽  
Donghee Lee ◽  
Sanghwan Lee ◽  
Kwangheon Park ◽  
Hyeon-Geun Lee ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Composite Tubes ◽  
Carbide Composite ◽  
Shock Resistance

scholarly journals Crucial effect of SiC particles on in situ synthesized mullite whisker reinforced Al2O3-SiC composite during microwave sintering

2017 ◽  
Vol 11 (2) ◽  
pp. 106-112 ◽  
Author(s):  
Xudan Dang ◽  
Meng Wei ◽  
Rui Zhang ◽  
Keke Guan ◽  
Bingbing Fan ◽  
...  
Keyword(s):  
Particle Size ◽  
Flexural Strength ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Hot Spot ◽  
Microwave Sintering ◽  
Sic Particles ◽  
Shock Resistance ◽  
Sic Particle

Mullite whisker reinforced Al2O3-SiC composites were in situ synthesized by microwave sintering at 1500?C for 30min. The influence of SiC particle size on heating process and properties of Al2O3-SiC composite were investigated. The XRD and SEM techniques were carried out to characterize the samples. The thermal shock resistance and flexural strength of the samples were examined through water quenching and three-point bending methods, respectively. It was found that the bridging of mullite whisker appeared between Al2O3 and SiC particles which enhanced the thermal shock resistance. A so-called local hot spot effect was proposed dependent on the coupling of SiC particles with microwave, which was the unique feature of microwave sintering. The maximal thermal shock resistance and flexural strength were obtained for the samples with SiC particle size of ~5?m.

Advanced Ceramics for Environmental Protection

1994 ◽  
Vol 344 ◽  
Author(s):  
Jeffrey A. Chambers
Keyword(s):  
Silicon Carbide ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Ceramic Materials ◽  
Environmental Applications ◽  
Fiber Reinforced ◽  
Gas Filtration ◽  
Advanced Ceramic ◽  
Hot Gas ◽  
Shock Resistance

AbstractAdvanced ceramic materials offer significant thermodynamic efficiency advantages over metals and alloys because of their higher use temperatures. Using ceramic components results in higher temperature industrial processes which convert fuels to energy more efficiently, reducing environmental emissions. Ceramics have always offered high temperature strength and superior corrosion and erosion resistance. However, brittleness, poor thermal shock resistance and catastrophic failure have slowed industrial adoptions of ceramics in environmental applications.This paper will focus on environmental applications of three new advanced ceramic materials that are overcoming these barriers to industrial utilization through improved toughness, reliability, and thermal shock performance. PRD-66, a layered oxide ceramic with outstanding thermal shock resistance and high use temperature with utility in catalyst support, insulation, and hot gas filtration applications, is discussed. Tough silicon carbide fiber reinforced silicon carbide (SiC/SiC) and carbon fiber reinforced silicon carbide (C/SiC) ceramic composites made by chemical vapor infiltration, and silicon carbide particulate reinforced alumina (SiCp/A12O3) composites made through Lanxide Corporation's DIMOX™ directed metal oxidation process are described. Applications of these materials to pollution reduction and energy efficiency in medical and municipal waste incineration, heat management, aluminum remelting, pyrolysis, coal combustion and gasification, catalytic pollution control, and hot gas filtration, will be discussed.

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