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Control of the Interfacial Reactions in Nb‐Toughened MoSi 2
Author(s) -
Shaw Leon,
Abbaschian Reza
Publication year - 1993
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1993.tb07769.x
Subject(s) - materials science , coating , diffusion barrier , composite material , physical vapor deposition , diffusion , refractory metals , deposition (geology) , chemical vapor deposition , niobium , metallurgy , layer (electronics) , nanotechnology , paleontology , sediment , biology , physics , thermodynamics
Toughening of MoSi 2 for high‐temperature applications can be achieved by incorporating ductile refractory‐metal reinforcements, provided that a coating is applied to prevent interdiffusion and reaction between the matrix and the reinforcements. In the present study, three different coating techniques for applying a thin Al 2 O 3 film on Nb reinforcements as a diffusion barrier have been studied. The techniques consisted of (i) sol‐gel coating; (ii) physical vapor deposition (PVD); (iii) hot dipping in molten Al, followed by anodizing Al to form Al 2 O 3 . The processing parameters for the techniques were evaluated and the effectiveness of each coating as a diffusion barrier was assessed. For the present MoSi 2 matrix which contains SiO 2 , PVD coatings provided the most effective diffusion barrier for processing MoSi 2 /Nb composites.