Synthesis of ZrC–SiC Powders from Hybrid Liquid Precursors with Improved Oxidation Resistance. Issue 1 (8th October 2014)

• Record Type: Journal Article
• Authors: Wang, Xiao‐Fei; Liu, Jia‐Chen; Hou, Feng; Hu, Ji‐Dong; Sun, Xin; Zhou, Yan‐Chun; Koc, R.
• Is Part Of: Journal of the American Ceramic Society. Volume 98:Issue 1(2015)
• Page Start: 197
• Page End: 204
• Publication Date: 2014-10-08
• Subjects: Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.13274
• Languages: English
• ISSNs: 0002-7820

Abstract

<abstract abstract-type="main" id="jace13274-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p>ZrC–SiC powders are synthesized by high‐temperature pyrolysis of hybrid liquid precursors, which are prepared from organic Zr‐containing precursor (PZC) and liquid polycarbosilane (LPCS). Due to the excellent miscibility between PZC and LPCS, the hybrid liquid precursors are formed by dissolving PZC into LPCS without adding organic solvent. The viscosity and elemental content of Zr and Si of the hybrid precursors are readily adjustable by controlling the LPCS/PZC mass ratio. SEM and TEM observations reveal that the ZrC–SiC powders pyrolyzed at 1550°C exhibit spherical morphology with characteristic dimension of less than 60 nm, and the two phases are uniformly distributed in composite powders. The advantage of the ZrC–SiC powders synthesized by this novel method is demonstrated by investigating the oxidation behavior of powders with different amount of SiC and ZrC. Below 700°C, ZrC quickly oxidizes to generate an almost nonprotective ZrO₂ scale, whereas at ~ 1000°C, dense and protective SiO₂ forms that improves the oxidation resistance of the ZrC–SiC composite powders.</p> </abstract>