Effects of Additives Content on the Properties of Porous SiC Ceramics

2016 ◽  
Vol 868 ◽  
pp. 89-94
Author(s):  
Rong Li ◽  
Rong Zhen Liu ◽  
Gao Jian Liu ◽  
Zhi Hao Jin
Keyword(s):  
Silicon Carbide ◽  
Melting Point ◽  
Porous Silicon ◽  
Bending Strength ◽  
Porous Silicon Carbide ◽  
Sic Ceramics ◽  
Proportional Relationship ◽  
Carbide Ceramics ◽  
Porous Sic ◽  
Silicon Carbide Ceramics

The porous silicon carbide ceramics were fabricated by adding a variety of low melting point oxides in this paper. The additives were mullite, magnesium oxide, calcium oxide, and vanadium oxide. Effects of the additives content on the properties of porous silicon carbide ceramics were studied. The results showed that, when the additives content was greater than 2.8%, the apparent porosity, the bending strength, the permeability and the pore size were in an inversely proportional relationship with the additives content, while the content was less than 2.8%, proportional relationship was observed. When the additives content reached 2.8%, the porous SiC ceramics showed the best performances.

Synthesis and Characteristics of Porous Silicon Carbide Ceramic Reinforced by Silicon Carbide Whiskers

2014 ◽  
Vol 602-603 ◽  
pp. 397-402 ◽  
Author(s):  
Xiao Xue Liu ◽  
Hong Sheng Zhao ◽  
Hui Yang ◽  
Kai Hong Zhang ◽  
Zi Qiang Li
Keyword(s):  
Silicon Carbide ◽  
Thermal Expansion ◽  
Porous Silicon ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Bending Strength ◽  
Silicon Powder ◽  
Fluid Filtration ◽  
Porous Silicon Carbide ◽  
Silicon Carbide Ceramics

Silicon powder and phenolic resin were used as raw materials to produce porous silicon carbide (SiC) ceramics, with SiC whiskers (SiCw) as reinforcement additionally. Starting with the preparation of core-shell structure precursor powder through coat-mix method, and then by carrying out molding, carbonization and sintering processes, SiCw/SiC ceramic examples were produced. The phase composite, fracture surface morphology, pore size and porosity, bending strength and thermal expansion coefficient of the final product were measured. Results show that the addition of SiCw apparently improved the intensive property of the products and the changing pattern were quantitatively analyzed; while little influence was observed on some other properties such as phase composition and thermal expansion coefficient. It means that SiCw can strengthen porous silicon carbide ceramics without weakening their thermal properties, which is particularly important because of its application in the field of high temperature fluid filtration. Incorporated SiCw is supposed to work in accordance with some toughening mechanism such as load transferring and matrix prestressing. Microstructure, pore evaluation and weight loss rate during carbonation and sintering were also noted to describe the procedure better.

The thermoelectric performance of silicon carbide semiconductor made from rice hull

1995 ◽  
Vol 410 ◽  
Author(s):  
E. Maed A ◽  
M. Komatsu
Keyword(s):  
Silicon Carbide ◽  
Porous Silicon ◽  
Thermoelectric Properties ◽  
Rice Hull ◽  
Nitrogen Gas ◽  
Porous Silicon Carbide ◽  
Thermoelectromotive Force ◽  
Type Semiconductor ◽  
Carbide Ceramics ◽  
Silicon Carbide Ceramics

ABSTRACTThermoelectric properties (Thermoelectromotive force and electrical conductivity) of porous silicon carbide ceramics are evaluated. Porous silicon carbide ceramics are made from rice hull by reacting silica and carbon, both of which are included in rice hull, using hotpressing method[1].When nitrogen gas is used as enviromental gas for hotpressing, this material becomes n-type semiconductor. It shows comparably high themoelectromotive force. Thermoelectric properties of this material change with the processing conditions.The relationship between thermoelectric properties and microstructure is also evaluated.

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