• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

IN-SITU MEASUREMENT AND SIMULATION FOR DEFORMATION AND SOLIDIFICATION PHENOMENA OF SUPER-COOLED SINGLE DROPLET UNDER PLASMA SPRAY CONDITIONS (2002)

Research Project

Project/Area Number 12305048
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Material processing/treatments
Research InstitutionThe University of Tokyo

Principal Investigator

YOSHIDA Toyonobu  THE UNIVERSITY OF TOKYO, GRADUATE SCHOOL OF ENGINEERING, PROFESSOR, 大学院・工学系研究科, 教授 (00111477)

Project Period (FY) 2000 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥47,160,000 (Direct Cost: ¥38,700,000、Indirect Cost: ¥8,460,000)
Fiscal Year 2002: ¥12,090,000 (Direct Cost: ¥9,300,000、Indirect Cost: ¥2,790,000)
Fiscal Year 2001: ¥24,570,000 (Direct Cost: ¥18,900,000、Indirect Cost: ¥5,670,000)
Fiscal Year 2000: ¥10,500,000 (Direct Cost: ¥10,500,000)
KeywordsPLASMA SPRAYING / IN-SITU MEASUREMENT / SUPER COOLING / DEFORMATION AND SOLIDIFICATION / SIMULATION / VISCOSITY / ZIRCONIA / MICRO-TRENCH / 溶射 / 急速変形 / 大過冷急速凝固 / 数値解析 / YSZ / 急速凝固 / 界面熱抵抗 / アルミナ
Research Abstract

The principal findings can be summarized as follows:
1.To date, many modeling efforts related to the deformation and solidification processes of a droplet impacting on the substrate under plasma spraying conditions have been reported. However, no modeling effort has dealt with the super-cooling effects on the deformation and solidification processes, though much evidence of super-cooling effects has been reported. In this research, we could show the first results derived from our recent modeling efforts for the case of Al_2O_3 droplets, which clearly show the strong effects of the super-cooling conditions on the deformation and solidification processes. For example, we successfully predicted a significant decrease in deformation degree -defined as the ratio of droplet to splat diameters -to less than 2.0, and also a faster solidification front velocity of up to 5 m/s. Although the small deformation degree is caused by the larger value of viscosity under super-cooled conditions, the rapi … More d solidification is eventually caused by the super-cooling. The model did not predict a dendritic growth, but it clearly suggested that plasma sprayed particles are not all but may be actually in super-cooled state, and any modeling efforts should include the super-cooling effects.
2.We developed an in-situ measurement system for precise 1:1 correlation between splat morphology and temperature history during impinging on the substrate under plasma spraying conditions with sampling the events successively under controlled atmosphere. In order to reveal the effectiveness of the system, deformation and solidification process of yttria-stabilized zirconia powder sprayed by hybrid plasma was measured successively at a horizontally moving substrate heated up to 700 K by a radiation-plate. The temperature was measured by 700 and 1000 nm emissions from a droplet, and the droplet size was evaluated ex-situ precisely based on the three dimensional morphology of the splat. The system made it possible to sample about 10 single particles successively within 10 second, and correlate precisely the relations between the size, temperature and impacting velocity of each droplet, and deformation-solidification process and morphology of the splats. The most striking finding is that a part of the droplets may be actually in super-cooled condition before impinging, but a drastic difference was not found in deformation process. In addition, as secondary results, we could evaluate the viscosity of YSZ and the thermal resistance between the splat and the substrate.
From the above, it can be seen that considerable progress was made towards the overall goal of this project, and the results obtained so far clearly demonstrate the feasibility of this approach. Less

Report

(4 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • 2000 Annual Research Report
  • Research Products

    (18 results)

All Other

All Publications (18 results)

  • [Publications] Y.K.Chae, J.Mostaghimi, T.Yoshida: "Deformation and solidification process of a super-cooled droplet impacting on the substrate under plasma spraying conditions."Sci.Technol.Adv.Mater. 1(3). 147-156 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 吉田 豊信: "プラズマ溶射高度化の要件"まてりあ. 40(4). 322-325 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Shinoda, P.Han, T.Yoshida: "The microstructure of YSZ splats deposited by hybrid plasma spraying"Proceedings of 15th International Symposium on Plasma Chemistry. 2661-2666 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Shinoda, R.Takenoshita, Y.Kojima, T.Yoshida: "In-situ measurement system for correlating splat morphology and solidification process under plasma spraying conditions"Proceedings of 15th International Symposium on Plasma Chemistry. (CDにて発刊). (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Shinoda, A.Yamada, T.Koseki, T.Yoshida: "In-situ measurement of sprayed ceramics particles and supercooling effects on splat morphology"Proceedings of International Thermal Spray Conference. (印刷中). (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 吉田 豊信: "ナノコーティングシステム"機能材料. 22(9). 5-10 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 吉田 豊信(共著): "プラズマの生成と応用 プラズマ・核融合学会編"コロナ社. 456 (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y.K.Chae, J.Mostaghimi, T.Yoshida: "Deformation and solidification process of a super-cooled droplet impacting on the substrate under plasma spraying conditions."Sci.Technol.Adv.Mater. 1(3). 147-156 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T.Yoshida: "Some issues for the development of spraying technology"Materia. 40(4). 322-325 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Shinoda, P.Han, T.Yoshida: "The microstructure of YSZ splats deposited by hybrid plasma spraying"Proceedings of 15th International Symposium on Plasma Chemistry. 2661-2666 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Shinoda, R.Takenoshita, Y.Kojima, T.Yoshida: "In-situ measurement system for correlating splat morphology and solidification process under plasma spraying conditions"Proceedings of 16th International Symposium on Plasma Chemistry. (CD). (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Shinoda, A.Yamada, Y.Koseki, T.Yoshida: "In-situ measurement of sprayed ceramics particles and supercooling effects on splat morphology"Proceedings of International Thermal Spray Conference. (in print). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T.Yoshida: "Nanocoating system"Function & Materials. 22(9). 5-10 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T.Yoshida: "Thermal Plasma"Plasma Production and Diagnostics, The Japan society of Plasma Science and Nuclear Fusion Research (JSPF) (Corona Publishing Co., Ltd.). Section 5.2. 251-262 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 吉田 豊信: "ナノコーティングシステム"機能材料. 9・22. 60-66 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] K.Shinoda, P.Han, T.Yoshida: "The Microstructure of YSZ Splats Deposited by Hybrid Plasma Spraying"Proceedings of 15th International Symposium on Plasma Chemistry. VI. 2661-2666 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 吉田豊信: "溶射プロセス高度化の要件"まてりあ. 40・4. 322-325 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Y.K.Chae,J.Mostaghimi,T.Yoshida: "Deformation and solidification process of a super-cooled droplet impacting on the substrate under plasma spraying conditions"Science and Technology of Advanced Materials. 1. 147-156 (2000)

    • Related Report
      2000 Annual Research Report

URL: 

Published: 2000-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi