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.

Abstract: A process for forming a coated article having a wear resistant coating that minimizes the generation and effects of wear debris is provided. Three independent mechanisms are operative: hard crystalline debris are avoided by specifying that all coating phases harder than 1000 VHN be amorphous, large wear debris from the coating are avoided by including finely dispersed porosity in the coating, and debris in the wear area is removed by a textured surface on some portion of the coating. The process for applying the coating need not use materials that are extremely hazardous to man and the environment.