Synthesis of beta-SiC powder from alkoxide precursor and study of its sintering behaviour

Abstract

In this study, b-SiC powder was prepared using a pyrolysed spherical precursor derived from the hydrolysis mixture of phenyltrimethoxysilane and tetraethyl orthosilicate. Before the pyrolysed experiment, an alkoxide precursor was characterised using 29 Si solid nuclear magnetic resonance, Fourier transform infrared spectroscopy and thermogravimetric analysis. The alkoxide precursor was heated at 1800uC for 4 h under an Ar atmosphere. To examine the pyrolysed residue after heat treatment, the sample was collected and analysed with X-ray diffraction. The X-ray diffraction results for the sample show diffraction peaks at ,35, 60 and 73u, which correspond to the b-SiC phase. According to the results of chemical analysis, the SiC content of the powder that was prepared at 1800uC was determined to be 99?4%. The sintering behaviour of the prepared b-SiC powder was examined using B 4 C and C as sintering additives in the temperature range of 1900-2200uC.

Purification and particle size control of β-SiC powder using thermocycling process

“…The experimental details are given in previous studies. 11 The TEOS (TEOS, 98% Si(OC 2 H 5 ) 4 , Aldrich), PTMS (PTMS, 98% C 6 H 5 Si(OCH 3 ) 3 , Aldrich), and ammonia solution (25% NH 4 OH, Daejung) used in this study were all reagent grade. A mixed 500 mL solution of PTMS and TEOS in a mole ratio of 5 : 5 was diluted in 1800 mL ethanol, and 25% NH 4 OH solution was added dropwise until the pH reached 9.…”

Preparation and properties of low friction silicon carbide ceramic seals by pore creation

“…[1][2][3][4][5][6] SiC ceramic has been widely used in all kinds of sliding wear applications, such as bearing, wear parts, valves, and seals. [7][8][9][10][11][12] In particular, it has made great contributions for sealing of mechanical devices in harsh working conditions.…”

“…Silicon carbide (SiC) ceramic is a well known structural material owing to its unique characteristics such as high hardness, high specific strength, resistance to oxidation, corrosion resistance, high thermal stabilities. [1][2][3][4][5][6] SiC ceramic has been widely used in all kinds of sliding wear applications, such as bearing, wear parts, valves, and seals. [7][8][9][10][11][12] In particular, it has made great contributions for sealing of mechanical devices in harsh working conditions.…”

Microstructures and thermal conductivities of reaction sintered SiC ceramics

“…[1][2][3][4][5] SiC ceramics are usually fabricated by the sintering method. However, the conventional sintering of SiC powders is inhibited by the strong covalent bonds, which retard the self-diffusion of carbon and silicon within the SiC structure.…”

“…Silicon carbide (SiC) based ceramics are considered to be promising materials for various applications owing to their desirable properties such as their high thermal conductivity, high hardness and chemical and thermal stability. [1][2][3][4][5] SiC ceramics are usually fabricated by the sintering method. However, the conventional sintering of SiC powders is inhibited by the strong covalent bonds, which retard the self-diffusion of carbon and silicon within the SiC structure.…”