The effects of transition metals on carbothermal synthesis of β-SiC powder

• Published in: Ceramics international 2007-01, Vol.33 (5), p.779-784
• Main Authors: Lin, Yung-Jen, Chuang, Chih-Ming
• Format: Article
• Language: English
• Subjects: Additives; Applied sciences; Building materials. Ceramics. Glasses; Ceramic; Ceramic industries; Cermets, ceramic and refractory composites; Chemical industry and chemicals; Chemistry; Colloidal state and disperse state; Combinatorial synthesis; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; General and physical chemistry; Materials science; Morphology; Other materials; Physics; Powder; Powders; Specific materials; Structural ceramics; Technical ceramics
• ISSN: 0272-8842; 1873-3956
• DOI: 10.1016/j.ceramint.2006.01.010

Several transition metals were added in the carbothermal syntheses of β-SiC powder from silica and phenolic resin at temperatures ≤1500 °C. The effects of the transition metals on the yields of SiC and powder morphology were investigated. The results showed that by adding 1 wt.% of Fe, Co or Ni in the silica/phenolic resin mixtures, the synthesizing temperature of SiC decreased and the yields of SiC increased. But adding Mn, Pd or Cu has no favorable effects on the syntheses of β-SiC powder. After reaction at 1400 °C, the highest yield was obtained by adding 1 wt.% Fe, which reaches 77%. Adding Co could result in 73% yield and adding Ni could only have 30% yield. The SiC powder obtained from mixtures with 1 wt.% Fe was agglomerated, while that from mixtures with 1 wt.% Co was mostly un-agglomerated particles of 100–300 nm in size. The positive effects of transition metals in SiC powder synthesis at temperatures