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Title: Morphology and mechanism study for the synthesis of ZrB{sub 2}–SiC powders by different methods

ZrB{sub 2}–SiC ceramics, whose SiC is generally incorporated into the system by mechanical mixing, are known to have better performance than monolithic ZrB{sub 2}. Therefore, synthesis of duplex ZrB{sub 2}–SiC powders is beneficial for improving sinterability and mechanical properties of ZrB{sub 2}–SiC composites. In the present work, ZrB{sub 2}–SiC duplex powders with different morphologies were synthesized at 1550 °C for 2 h using as-synthesized amorphous hydrous ZrO{sub 2}–SiO{sub 2}. Both precipitation and sol–gel methods were used to prepare ZrO{sub 2}–SiO{sub 2} precursors. ZrB{sub 2}–SiC powder derived from precipitation method presented a rod-like morphology with smaller irregular particles adhering to them. And the morphology from sol–gel method was equiaxed shape with a very uniform distribution for principal components of Zr and Si. - Graphical abstract: SEM images of the ZrB2-SiC powders obtained by different methods. Display Omitted - Highlights: • ZrB{sub 2}–SiC powders with different morphologies were synthesized. • Precipitation and sol–gel methods were used to prepare ZrO{sub 2}–SiO{sub 2} precursors. • Possible mechanisms of morphology formation were investigated. • This work provided a potential way of morphology control for raw powders. • The synthesized duplex powders achieved a uniform distribution of SiC in ZrB{sub 2}.
Authors:
;  [1] ;  [2] ; ; ; ;  [1] ;  [1] ;  [3] ;  [2] ;  [3]
  1. Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, Beijing 100191 (China)
  2. Aerospace Research Institute of Materials and Processing Technology, No. 1 Nan Da Hong Men Road, Fengtai District, Beijing 100076 (China)
  3. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577 (Japan)
Publication Date:
OSTI Identifier:
22274138
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 207; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CERAMICS; CONTROL; MECHANICAL PROPERTIES; MORPHOLOGY; POWDERS; PRECIPITATION; SCANNING ELECTRON MICROSCOPY; SILICON CARBIDES; SYNTHESIS; ZIRCONIUM BORIDES