Melting behavior of alumina particles in plasma spraying

Susumu Uematsu, Chiori Takahashi

Research output: Contribution to journalArticle

Abstract

The collection of flying particles in plasma spraying has been performed by use of a chemical filter and a carbon adhesive tape and subjected to scanning electron microscopy (SEM). The observation reveals that the fusion mechanism of large and thick ceramic particles is different from that of smaller ceramic or metal particles. After introducing alumina particles into plasma jet, the separation occurs at the 1-2 micron under the surface of particles by the thermal stress. This separated thin layer prevents the internal thermal conduction in the particle and is heated up to completely melted by plasma flame. The melted part moves to the end of solid part and remains at the side edges of solid. At the same time the next separation and melting sequence starts at the solid surface followed by the melting parts apart from the solid to be a single and connected sphere particles before impact the substrate. This observation also provides an excellent method visualizing the particle melting process in the plasma jet without a special equipment.

Original languageEnglish
Pages (from-to)90-97
Number of pages8
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume63
Issue number1
DOIs
Publication statusPublished - 1999 Jan 1
Externally publishedYes

Fingerprint

plasma spraying
Plasma spraying
Aluminum Oxide
Melting
Alumina
aluminum oxides
melting
Plasma jets
Thermal stress
Tapes
plasma jets
Adhesives
Fusion reactions
Carbon
Metals
ceramics
Plasmas
Scanning electron microscopy
metal particles
Substrates

Keywords

  • Alumina particles
  • Carbon tape
  • Chemical filter
  • Melting behavior
  • Plasma spraying
  • Wipe test

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

Cite this

Melting behavior of alumina particles in plasma spraying. / Uematsu, Susumu; Takahashi, Chiori.

In: Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals, Vol. 63, No. 1, 01.01.1999, p. 90-97.

Research output: Contribution to journalArticle

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