Stabilized two-phase-glass diffusion barrier
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United States of America Patent
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Jun 6, 2000
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N/A
app pub date -
Oct 30, 1998
filing date -
Oct 30, 1998
priority date (Note) -
Expired
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Abstract
An article with a corrosion-resistant diffusion barrier is provided to resist the attack of corrosion agents, during service at high temperature (>600.degree. C.). More specifically, a diffusion barrier containing a stabilized two-phase glass is provided. The stabilized two-phase glass comprises glass-forming oxides, other oxides with low cation coordination numbers and stabilizing agents wherein the glass-forming oxides block ionic transport by virtue of their network formation on the atomic scale and the stabilizing agents improve the stability of the diffusion barrier and compatibility with the substrate. The diffusion barrier covers some portion of the substrate that is optionally augmented by a base layer or a sealant layer. Being impervious and having low-solubility in corrosive environments, the diffusion barrier stops corrosive agents from reaching the substrate. When applied over aluminide coatings, it effectively improves the potency of the aluminides and prevents their rapid dissolution into the corrosive environment. The diffusion barrier can be applied by a process that evenly coats intricate geometries and does not harm substrate properties.
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