TiN coated SiC composite powders produced by controlled hydrolysis

Lin Zhang, Xin Lu, Yu Qiang Zhao, Xuan Hui Qu, Xin Bo He, Ming Li Qin, Komin Shu

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

TiN coated SiC powders were prepared by the method of controlled hydrolysis and subsequent nitridation with NH3 gas. The effects of the type of TiO2 precursor, the way of precipitation, the amount of water on particle size and the dispersibility of hydrolysis product of TiO2 were investigated. The structural evolution of the TiO2 coated layer under varied nitridation temperature was analyzed. The main focus was put on the mechanisms of controlled hydrolysis and subsequent nitridation and the characterization of the morphology, phase constitution and thermal stability of the obtained TiN coated SiC powders. The results indicate that hydrolysis of the uniform coating of TiO2 layer can be easily achieved by controlled hydrolysis than the precipitation method. The amount of the added water is the key factor to reduce the aggregation of TiO2. TiO2 film can be transformed completely to TiN after nitridation at the temperature of 1000°C. The obtained TiN film is uniform and continuous. The sizes of TiN particles covering SiC powder are 30-70 nm. When the temperature is higher than 546°C, TiN film is easily oxidized in air and lost its stability.

Original languageEnglish
Pages (from-to)2825-2832
Number of pages8
JournalZhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals
Volume22
Issue number10
Publication statusPublished - 2012 Oct 1
Externally publishedYes

Keywords

  • Coated particle
  • Controlled hydrolysis
  • Surface coating
  • Thermal stability
  • TiN coated SiC

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Metals and Alloys
  • Materials Chemistry

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