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Preparation of Crystalline Ceramic Materials by Hydrothermal Electrolytic Oxidation

Research Project

Project/Area Number 60470072
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 無機工業化学
Research InstitutionTokyo Institute of Technology

Principal Investigator

MASAHIRO YOSHIMURA  Research Laboratory of Engineering Materials, Professor, 工業材料研究所, 教授 (10016826)

Project Period (FY) 1985 – 1986
Project Status Completed (Fiscal Year 1986)
Budget Amount *help
¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 1986: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1985: ¥3,000,000 (Direct Cost: ¥3,000,000)
KeywordsHydrothermal electrolytic oxidation / Hydrothermal oxidation / Zirconia / Niobium oxide / Anodic oxidation / Fine powders / Titania / 酸化亜鉛
Research Abstract

A new technique : hydrothermal electrolytic (anodic) oxidation, has been developped to fabricate films or fine powders of oxides by combining hydrothermal oxidation and anodic (electrolytic) oxidation techniques for metals and alloys. The results and summary are as follows:
1. An autoclave, max 300゜C, 20 MPa, 980 ml with 3 inner electrodes has been fabricated.
2. In the anodic oxidation of Zr under hydrothermal conditions, continuous anodized film was formed on Zr plate below 200゜C in <H_2SO_4> or Y <(NO_3)_3> solutions.
3. Above 200゜C,Zr plate showed pitting and/or edge dissolution under high potential above 3 V in conc. Y <(NO_3)_3> solutions.
4. The surface and the precipitates of the Zr plate were monoclinic <ZrO_2> polycrystals with the crystallite size of submicron.
5. A small amount of Y was detected in the products by ESCA.
The anodic oxidation of Nb plate in hydrothermal LiOH, <Li_2CO_3> and <LiNO_3> solutions gave th e results as follows:
6. Passivation of Nb was established by the formation of the anodic oxide film in any conditions studied.
7. The anodized films were amorphous by X-ray diffraction.
8. Potentiostatic analysis at 4.5 V indicated the leakage current increased with temperature from 100゜ to 200^C but decreased at 250゜C because of the densification of the film at higher temperatures.
9. In the galvanostatic anodic oxidation at 250゜C in 0.1 N- <LiNO_3> , oxide film formed in relation to the applied current in innitial stages but almost stopped after a certain period when a low current density was applied.
By the hydrothermal oxidation method, the metals of Zn, Ti and Nb yielded ZrO, <TiO_2> (rutile) and monoclinic <Nb_2O_5> as the final products.

Report

(1 results)
  • 1986 Final Research Report Summary
  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] 吉村昌弘,大平弘之,宗宮重行: 窯業協会誌. 3〔7〕. 357-363 (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 吉村昌弘,大平弘之,宗宮重行: 窯業協会誌. 94〔11〕. 1186-1189 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 中川隆広,神野公行,吉村昌弘,宗宮重行: 窯業協会誌. 94〔11〕. 1131-1135 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] M.Yoshimura;H.Ohira;S.Somiya: Report Res Lab.Eng.Mater.,Tokyo Inst.Tech.12. (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 吉村昌弘,柳承乙,春山志郎,宗宮重行: 窯業協会誌.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 吉村昌弘,柳承乙,春山志郎,宗宮重行: 日本化学会誌.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] M. Yoshimura, H. Ohira and S. Somiya: "Hydrothermal oxidation of titanium metal" Yogyo Kyokai Shi. 93 (7). 357-363 (1985)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] M. Yoshimura, H. Ohira and S. Somiya: "Hydrothermal oxidation of Zinc metal" Yogyo Kyokai Shi. 94 (11). 1186-1189 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] T. Nakagawa, K. Kamino, M. Yoshimura and S. Somiya: "Hydrothermal reaction sintering of Permalloy - Iron oxide composite" Yogyo Kyokai Shi. 94 (11). 1131-1135 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] M. Yoshimura, H. Ohira and S. Somiya: "Formation of TiO and ZnO Powders by Hydrothermal Oxidation of Ti and Zn Metals" Report of RLEMTIT(Res. Lab. Eng. Mater.,Tokyo Inst. Tech.). 12. (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] M. Yoshimura, S.-U. Yoo, S. Haruyama and S. Somiya: "Hydrothermal Anodic Oxidation of Zr Metal" Yogyo Kyokai Shi in preparation.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary

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Published: 1987-03-31   Modified: 2016-04-21  

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