Environmental barrier materials and coatings containing low melting temperature phases

Abstract

Environmental barrier materials and coatings containing low melting temperature materials are provided. The materials and coatings include high melting temperature materials, such as rare earth silicates, mullite, hafnon, zircon, HfO2, and rare earth stabilized ZrO2. The low melting temperature materials have a melting temperature of less than 1500° C. The low melting temperature materials in the coating in-situ melt, flow, and fill the microstructural defects after post-heat treatment. Due to reduced microstructural defects, EBCs containing low melting temperature materials provide an enhanced barrier against oxidants diffusion and result in 10 times slower TGO growth rate as compared to coatings without low melting temperature materials.

Dependencies are inferred from the claim text.