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Title: Strength improvement and purification of Yb 2Si 2O 7-SiC nanocomposites by surface oxidation treatment

A two-step processing was developed to prepare Yb 2Si 2O 7-SiC nanocomposites. Yb 2Si 2O 7-Yb 2SiO 5-SiC composites were first fabricated by a solid state reaction/hot-pressing method. The composites were then annealed at 1250°C in air for 2 h to activate the oxidation of SiC, which effectively transformed the Yb 2SiO 5 into Yb 2Si 2O 7. The surface cracks purposely induced can be fully healed during the oxidation treatment. The treated composites have improved flexural strength compared to their pristine composites. As a result, the mechanism for crack-healing and silicate transformation have been proposed and discussed in detail.
Authors:
ORCiD logo [1] ;  [1] ;  [1] ;  [1] ; ORCiD logo [2] ;  [3] ;  [1]
  1. Nagaoka Univ. of Technology, Niigata (Japan)
  2. Idaho National Lab. (INL), Idaho Falls, ID (United States)
  3. Hanyang Univ., Ansan (South Korea)
Publication Date:
Report Number(s):
INL/JOU-16-40688
Journal ID: ISSN 0002-7820; TRN: US1702319
Grant/Contract Number:
AC07-05ID14517
Type:
Accepted Manuscript
Journal Name:
Journal of the American Ceramic Society
Additional Journal Information:
Journal Volume: 100; Journal Issue: 7; Journal ID: ISSN 0002-7820
Publisher:
American Ceramic Society
Research Org:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org:
USDOE Office of Nuclear Energy (NE)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; strength; nanocomposites; oxidation; silicon carbide; cracks/cracking
OSTI Identifier:
1363939