Preparation and properties of SiCN/Sialon nanocomposites

Fukuan Zhang, Fa Luo, Hua Zhang, Wancheng Zhou

Research output: Contribution to journalArticlepeer-review

Abstract

Aiming at obtaining high quality RAM (radar-wave absorbing materials), we used nanometer SiCN powder as radar-wave absorber and Sialon as matrix to prepare SiCN/Sialon composite by pressureless sintering process. The SiCN powder were synthesized by laser induction of HMDS and ammonia. The effect of addition of SiCN powder into Sialon on strength and permittivity of the SiCN/Sialon composite was studied. XRD, SEM and strength analyses were performed on the samples. XRD results indicate that the composite is composed of β-Sialon, β-SiC and SiO2, and β-Sialon is its main phase. SEM and strength analyses show that the content and size of β-Sialon and strength of the composite decrease with increasing content of SiCN powder in the samples. The addition of SiCN powder into Sialon increases the glutinosity of glass formed during sintering process by additives and SiO2 film on the surface of Si3N4, and lowers the sintering densities of the samples. The higher glutinosity of the formed glass hinders dissolution of α-Si3N4 into it, reduces the concentration of Si3N4 in the glass, and decreases the nuclear formation of β-Sialon in the glass, and prevents the growth of formed β-Sialon.

Original languageEnglish
Pages (from-to)488-491
Number of pages4
JournalXibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University
Volume23
Issue number4
StatePublished - Aug 2005

Keywords

  • Complex permittivity
  • Nanometer SiCN
  • Sialon

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