Journal of Materials Science

, Volume 24, Issue 8, pp 2697–2703 | Cite as

Wetting improvement of carbon or silicon carbide by aluminium alloys based on a K2ZrF6 surface treatment: application to composite material casting

  • J. P. Rocher
  • J. M. Quenisset
  • R. Naslain
Papers

Abstract

A surface treatment with aqueous solutions of K2ZrF6 has been carried out to improve, in dramatic manner, the wetting of carbon (or SiC)-base ceramics by liquid light alloys at low temperatures (i.e. within the 700 to 900°C range). The mechanism which is thought to be responsible for the wetting improvement involves two steps: (i) K2ZrF6 reacts with aluminium with the formation of K3AlF6, other complex fluoride species and intermetallics, (ii) K3AlF6 dissolves the alumina thin layer, coating the liquid light alloy and enables the wetting of the ceramics. The mechanism has been worked out from sessile drop experiments, solid state chemistry experiments and composite casting. The K2ZrF6 surface treatment appears to be particularly suitable for processing composite materials made of carbon (or SiC) fibrous preforms and aluminium-base matrices according to techniques directly derived from the light alloy foundry.

Keywords

Carbide Composite Material Aluminium Alloy Silicon Carbide Sessile Drop 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman and Hall Ltd. 1989

Authors and Affiliations

  • J. P. Rocher
    • 1
  • J. M. Quenisset
    • 1
  • R. Naslain
    • 1
  1. 1.Laboratoire de Chimie du Solide du CNRSUniversité de Bordeaux-1Talence CédexFrance

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