SiC Powder for Casting from Aqueous Suspension

2006 ◽  
Vol 45 ◽  
pp. 297-302
Author(s):  
Ludosław Stobierski ◽  
Jerzy Lis ◽  
Agnieszka Gubernat
Keyword(s):  
Silicon Carbide ◽  
Aqueous Suspension ◽  
Combustion Method ◽  
Sintered Body ◽  
Pressureless Sintering ◽  
Sic Particles

The activation of silicon carbide by boron and carbon is required to obtain dense monophase sintered body from SiC powder. The presence of carbon renders casting from aqueous suspension impossible. The SiC powders with boron and extra carbon were prepared by combustion method (SHS), where carbon was bound to SiC particles in a stable way. The experiments showed that this powder could be used for processing by casting of aqueous suspension. Finally nearly dense polycrystals were obtained by pressureless sintering.

scholarly journals Fine defective structure of silicon carbide powders obtained from different starting materials

2006 ◽  
Vol 38 (2) ◽  
pp. 177-181 ◽  
Author(s):  
T.V. Tomila ◽  
M.V. Vlasova ◽  
M.G. Kakazey ◽  
K.L. Vyshnyakova ◽  
A.V. Ragulya ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Carbon Black ◽  
Silicic Acid ◽  
Lattice Parameter ◽  
Ir Absorption ◽  
Defective Structure ◽  
Hydrated Cellulose ◽  
Sic Particles ◽  
Acid Gel ◽  
Absorption Characteristics

The fine defective structure of silicon carbide powders obtained from silicic acid-saccharose, aerosil-saccharose, aerosil-carbon black, and hydrated cellulose-silicic acid gel systems was investigated. The relation between IR absorption characteristics and the microstructure of SiC particles obtained from different starting materials was established. The numerical relationship between the lattice parameter a and the frequency ?TO is presented.

scholarly journals Синтез наночастиц карбида кремния методом лазерного пиролиза смеси моносилана и ацетилена

2020 ◽  
Vol 54 (11) ◽  
pp. 1233
Author(s):  
И.А. Ершов ◽  
Л.Д. Исхакова ◽  
В.И. Красовский ◽  
Ф.О. Милович ◽  
С.И. Расмагин ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Gas Phase ◽  
Reaction Zone ◽  
Phase Reaction ◽  
Synthesis Reaction ◽  
Flow Ratio ◽  
Laser Synthesis ◽  
Gas Phase Reaction ◽  
Silicon Carbide Nanoparticles ◽  
Sic Particles

The conditions of the laser-enhanced synthesis reaction of silicon carbide nanoparticles are determined and the nanoparticles are characterized. The gas-phase reaction of laser synthesis of SiC particles is observed at SiH4/C2H2 flow ratio in the range of 1.6-3.2. The temperature in the reaction zone was ~1400--1500ºC. Silicon carbide nanoparticles ~6 nm in diameter are produced and their composition is studied.

Correlation between microstructure and mechanical properties in silicon carbide with alumina addition

1993 ◽  
Vol 8 (7) ◽  
pp. 1635-1643 ◽  
Author(s):  
S.S. Shinozaki ◽  
J. Hangas ◽  
K.R. Carduner ◽  
M.J. Rokosz ◽  
K. Suzuki ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Silicon Carbide ◽  
Analytical Electron Microscopy ◽  
High Strength ◽  
High Fracture Toughness ◽  
Sintered Body ◽  
High Fracture ◽  
High Fatigue ◽  
Alumina Addition

The microstructure of pressureless sintered silicon carbide (SiC) materials with alumina (Al2O3) addition was investigated using analytical electron microscopy and nuclear magnetic resonance. A sintered body with a density of higher than 99% theoretical was obtained with an addition of 5 wt.% Al2O3. The sintered body (SiC–Al2O3) has high strength, high fracture toughness, and high fatigue resistance. Its fracture toughness is approximately 5 MPa-m1/2, which is twice as high as that of pressureless sintered SiC materials with boron and carbon additions (SiC–B–C). The correlation between the microstructure and the mechanical properties is presented here. The starting β–SiC powder is mostly transformed to α–SiC with various polytype distributions during the sintering process. The microstructure has homogeneously distributed, fine, plate-like interlocking gains with a high aspect ratio. Well-developed basal planes form parallel and elongated boundaries, and the crystal structure is mostly the 6H polytype (56%) mixed with thin lamellar 4H.

Hydrolysis assisted solidification of silicon carbide ceramics from aqueous suspension

2005 ◽  
Vol 31 (1) ◽  
pp. 159-163 ◽  
Author(s):  
Wei Li ◽  
Zhangsheng Liu ◽  
Mingyuan Gu ◽  
Yanping Jin
Keyword(s):  
Silicon Carbide ◽  
Aqueous Suspension ◽  
Carbide Ceramics ◽  
Silicon Carbide Ceramics

Gelcasting and pressureless sintering of silicon carbide ceramics using Al2O3–Y2O3 as the sintering additives

2013 ◽  
Vol 33 (10) ◽  
pp. 1695-1699 ◽  
Author(s):  
Jingxian Zhang ◽  
Dongliang Jiang ◽  
Qingling Lin ◽  
Zhongming Chen ◽  
Zhengren Huang
Keyword(s):  
Silicon Carbide ◽  
Pressureless Sintering ◽  
Sintering Additives ◽  
Carbide Ceramics ◽  
Silicon Carbide Ceramics
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