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1996 Fiscal Year Final Research Report Summary

STUDIES ON ANISOTROPIC STRUCTURE AND PROPERTIES OF CO ATINGS

Research Project

Project/Area Number 07650856
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Material processing/treatments
Research InstitutionFUKUI MTECHNOLOGICAL UNIVERSITY

Principal Investigator

MARUO Hiroshi  Department of Mechanical Engineering FUKUI MTECHNOLOGICAL UNIVERSITY, 工学部, 教授 (50028982)

Project Period (FY) 1995 – 1996
KeywordsPlasma sprayd coating / Deformation and solidification / Splat disc / Anisotropic structure / Sound velocity in coatings / 硬さ
Research Abstract

Purpose this research project is to make clear the influence of splat accumlation on the anisotropic structure and properties of plasma sprayd coating, at the stage of spraying processing.
Experimental researches were caried out for two years, 1995-1996, results obtained are summarized as follows ;
1) Observations of splat deformation on the surface of substrate.
A group of spraying particles flying at almost same velocity were extracted from the massive spraying particle stream so as to confirm the deformation and solidification of droplet having similar velocity. State of deformation of splat on stainless steel plate substrate was observed with SEM microscope.
2) 2 Estimation of time to deform, and time to solidify of droplet on the substrate surface Molten droplet deforms to flat disc within a microsecond scale of time, and solidified after a time of millisecond order. These results were discussed theoretically.
3) Anisotropic structure and hardness of plasma sprayd coatings.
Cross sectional microscopic structure of coatins were invesigated carefully. Lamellar structure was confirmed by the vickers hardness tests.
4) Anisotropic characteristics in sound propagation
Sound velocity in perpendicular direction with respect to the zirconia coating layr, and sound velocity velocity in parallel direction were investigated with the values of 3480 m/s and 3870 m/s obtained.
5) Observation of dynamic deformation of plasma aorayd coating, with the aid of microscope.
Sprayd zirconia bending specimen, polished prior to bend, was tested under three point bending loading device. Failure of coating were hardely observed in the ellastic range of substrate materials, but brittle fracture come arise suddenly due to lack of ductility of ceramic materials.

  • Research Products

    (2 results)

All Other

All Publications (2 results)

  • [Publications] 丸尾大: "溶射技術(プラズマ溶射条件の設定手法)" 日本機械学会北陸信越支部特別講演会予稿集. 21-26 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] HIROSHI MARUO: "ON THERMAL SPRAYING TECHNOLOGY,Setting of sprying conditions and its effects. Abstructs for Special Meeting for Recent Advansed Technology in Mechanical Engineering." JAPAN SOCIETY OF MECHANICAL ENGINEERING,HOKURIKU DIVISION.28, Feb.(1997)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-09  

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