Patent ID: 8168259

Claim:
A method for making an article, comprising: providing a substrate; disposing a self-sealing layer comprising a rare-earth aluminosilicate over the substrate, wherein the rare-earth aluminosilicate has a composition in the range bounded by a region in alumina/silica/rare-earth oxide compositional space defined by a first line connecting a first composition point at (10 mole % alumina, 62 mole % silica, 28 mole % rare-earth oxide) with a second composition point at (40.5 mole % alumina, 48.5 mole % silica, 11 mole % rare-earth oxide), a second line connecting a third composition point at (58.3 mole % alumina, 27.8 mole % silica, 14 mole % rare-earth oxide) with a fourth composition point at (24.5 mole % alumina, 42.5 mole % silica, 33 mole % rare-earth oxide), a third line connecting the first composition point with the fourth composition point, and a fourth line connecting the second composition point with the third composition point; and heating the self-sealing layer to a sealing temperature at which at least a portion of the sealing layer will flow.