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Journal of Materials Science

, Volume 27, Issue 16, pp 4536–4544 | Cite as

Interactions between Ti and alumina-based ceramics

  • S. Kang
  • J. H. Selverian
Papers

Abstract

Reactive metal coatings have been frequently used on ceramic materials for various purposes. However, little work was done in the past to understand the interactions between coating and ceramic substrates and their effects on the mechanical properties of the ceramics. In this study, titanium coatings were applied to single-crystal (sapphire) and polycrystalline alumina to study the interface reactions. Also, the effect of the coating on the mechanical properties of the substrates was quantified in terms of modulus of rupture (MOR) in four-point bending strength. Reactions between the coating and the Al2O3-based substrates at 980°C caused the formation of a new phase, Ti3Al[O], and a significant decrease (15%–65%) in the MOR strength of the ceramic materials. This study showed that in polycrystalline alumina, interactions between titanium and the glassy grain-boundary phase in the ceramic materials were responsible for reduction in the MOR strength, while the effect of thermal expansion mismatch between titanium and the ceramic substrate appeared to be dominant for singlecrystal alumina.

Keywords

Polymer Alumina Titanium Mechanical Property Thermal Expansion 
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 & Hall 1992

Authors and Affiliations

  • S. Kang
    • 1
  • J. H. Selverian
    • 1
  1. 1.GTE Laboratories IncorporatedWalthamUSA

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