Fabrication of TiAl intermetallic phases by heat treatment of warm sprayed metal precursors

Judyta Sienkiewicz, Seiji Kuroda, Rafał M. Molak, Hideyuki Murakami, Hiroshi Araki, Susumu Takamori, Krzysztof J. Kurzydłowski

研究成果: Article査読

25 被引用数 (Scopus)

抄録

Warm Spraying is an atmospheric coating process based on high-velocity impact bonding of powder particles. By decreasing the temperature of combustion gas via mixing with nitrogen the oxidation of feedstock powder can be effectively controlled. This is particularly important for Ti-based coating materials, which rapidly oxidize at elevated temperatures. In this study, Ti-Al composite coatings were fabricated by the Warm Spray process using a mixture of titanium and aluminum powders as a feedstock and applying a two-stage heat treatment at 600 and 1000 C to obtain intermetallic phases. The microstructure, chemical and phase composition of the deposited and heat-treated coatings were investigated using SEM, EDS and XRD. The experimental results show that TiAl3 was the first intermetallic phase formed during the first-stage heat treatment. The growth of TiAl3 layer occurred mainly by diffusion of Al into Ti particles. Significant porosity that developed during the heat treatment was caused mainly by Kirkendall effect. After the second-stage heat treatment, a coating layer with TiAl as the dominant phase was obtained with about 20 vol % porosity.

本文言語English
ページ(範囲)57-64
ページ数8
ジャーナルIntermetallics
49
DOI
出版ステータスPublished - 2014 6 1
外部発表はい

ASJC Scopus subject areas

  • 化学 (全般)
  • 材料力学
  • 機械工学
  • 金属および合金
  • 材料化学

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