Interfacial phenomena during melt processing of ceramic particle-reinforced metal matrix composites part I. Introduction (incorporation) of solid particles into melts

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Incorporation of ceramic particles into liquid metals is the first necessary step of melt processing of Metal Matrix Composites (MMCs). Literature review of existing equations/models is given, and contradictions in the literature are discussed. Detailed thermodynamic analysis shows, that the equilibrium depth of immersion (x) of the spherical particle into the melt can be expressed as: xequilibrium = R(1 + cosΘ)) = RWalv where R is the radius of the particle, Θ and Wa are the equilibrium contact angle and adhesion energy between the melt and the particle, σlv is the surface tension of the melt. The following conclusions have been drawn from the above equation: i. Any particle with 0°<Θ<180° will have an equilibrium depth of immersion, being between 0 and 2R, i.e., in equilibrium even non-wettable particles will be partly immersed, but even wettable particles will not be totally incorporated into the melt. ii. If one wants a particle to be spontaneously incorporated into the melt, perfect wetting Θ=0° is required. In other words it means, that the adhesion energy between the melt and the particle should be at least twice higher than the surface tension of the melt. For molten metals with high surface tension values (magnitude of 1 J/m2) such requirement can be met only, if some chemical interaction appears between the particle and the melt. The effect of gravity is also considered. It has been shown that gravity has any significant effect on incorporation of big particles only, with radius of at least 100 micrometer. Generally for particles used in MMCs gravity has a negligible effect, and conclusions given above remain valid.

Original languageEnglish
Pages (from-to)459-466
Number of pages8
JournalMaterials Science Forum
Volume215-216
Publication statusPublished - Dec 1 1996

Keywords

  • Ceramic Particles
  • Incorporation
  • Liquid Metals
  • Metal Matrix Composites
  • Wetting

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Interfacial phenomena during melt processing of ceramic particle-reinforced metal matrix composites part I. Introduction (incorporation) of solid particles into melts'. Together they form a unique fingerprint.

  • Cite this