Resistance to active oxidation of Sol-Gel HfO2 coated SiC polycrystal

T. Akashi, M. Kasajima, H. Kiyono

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Sintered SiC substrate was coated with HfO2 by a sol-gel process using Hf(OEt)4, diethanol-amine, and ethanol. The HfO 2-coated SiC specimen was oxidized isothermally in high purity Ar gas flow at 1873 K for 36 ks and the weight change was monitored by an electro-microbalance. The weight of the un-coated SiC specimen decreased significantly due to the active oxidation, while the weight losses of HfO 2-coated SiC specimens after the isothermal oxidation for 36 ks were smaller than that of un-coated specimen. TEM image of HfO2-coated SiC specimen after oxidation depicted that thick SiO2 layer (∼800 nm) with a small amount of Hf elements formed on the surface of the specimen. XRD analysis indicated that HfC formed during the isothermal oxidation of HfO2-coated SiC specimen.

Original languageEnglish
Title of host publicationECS Transactions - High Temperature Corrosion and Materials Chemistry 7 - 214th ECS Meeting
Pages185-190
Number of pages6
Edition44
DOIs
Publication statusPublished - 2008 Dec 1
EventHigh Temperature Corrosion and Materials Chemistry 7 - 214th ECS Meeting - Honolulu, HI, United States
Duration: 2008 Oct 122008 Oct 17

Publication series

NameECS Transactions
Number44
Volume16
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Conference

ConferenceHigh Temperature Corrosion and Materials Chemistry 7 - 214th ECS Meeting
CountryUnited States
CityHonolulu, HI
Period08/10/1208/10/17

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ASJC Scopus subject areas

  • Engineering(all)

Cite this

Akashi, T., Kasajima, M., & Kiyono, H. (2008). Resistance to active oxidation of Sol-Gel HfO2 coated SiC polycrystal. In ECS Transactions - High Temperature Corrosion and Materials Chemistry 7 - 214th ECS Meeting (44 ed., pp. 185-190). (ECS Transactions; Vol. 16, No. 44). https://doi.org/10.1149/1.3224755