Multiphase compositions for oxidation protection of composite articles

A method for limiting an oxidation reaction in a composite substrate, comprising:

• mixing a first glass phase matrix with a second glass phase matrix to form a multiphase glass slurry, wherein the second glass phase matrix has a second glass transition temperature that is at least 100 degrees Celsius higher than a first glass transition temperature of the first glass phase matrix;
• wherein the second glass phase matrix comprises at least one of:
• a first sealing glass having a density of 2.99 grams per cubic centimeter (g/cc), a softening point of 395° C., a coefficient of thermal expansion of 21.6 ppm/° C., and a glass transition temperature of 318° C.;
• a second sealing glass having a density of 6.79 g/cc, a softening point of 408° C., a coefficient of thermal expansion of 10.5 ppm/° C., and a glass transition temperature of 324° C.;
• a third sealing glass having a density of 2.96 g/cc, a softening point of 422° C., a coefficient of thermal expansion of 20 ppm/° C., and a glass transition temperature of 350° C.;
• a fourth sealing glass having a density of 5.73 g/cc, a softening point of 490° C., a coefficient of thermal expansion of 8.2 ppm/° C., and a glass transition temperature of 411° C.;
• a fifth sealing glass having a density of 2.34 g/cc, a softening point of 590° C., a coefficient of thermal expansion of 9.4 ppm/° C., and a glass transition temperature of 465° C.;
• a sixth sealing glass having a density of 3.32 g/cc, a softening point of 622° C., a coefficient of thermal expansion of 5.8 ppm/° C., and a glass transition temperature of 460° C.;
• a seventh sealing glass having a density of 2.61 g/cc, a softening point of 639° C., a coefficient of thermal expansion of 9.3 ppm/° C., and a glass transition temperature of 487° C.;
• an eighth sealing glass having a density of 3.14 g/cc, a softening point of 648° C., a coefficient of thermal expansion of 4 ppm/° C., and a glass transition temperature of 539° C.;
• a ninth sealing glass having a density of 2.59 g/cc, a softening point of 654° C., a coefficient of thermal expansion of 10 ppm/° C., and a glass transition temperature of 481° C.;
• a tenth sealing glass having a density of 3.03 g/cc, a softening point of 658° C., a coefficient of thermal expansion of 8.7 ppm/° C., and a glass transition temperature of 589° C.;
• an eleventh sealing glass having a density of 2.25 g/cc, a softening point of 673° C., a coefficient of thermal expansion of 5.7 ppm/° C., and a glass transition temperature of 577° C.;
• a twelfth sealing glass having a density of 2.41 g/cc, a softening point of 680° C., a coefficient of thermal expansion of 5 ppm/° C., and a glass transition temperature of 505° C.;
• a thirteenth sealing glass having a density of 2.66 g/cc, a softening point of 699° C., a coefficient of thermal expansion of 7.2 ppm/° C., and a glass transition temperature of 613° C.;
• a fourteenth sealing glass having a density of 2.91 g/cc, a softening point of 717° C., a coefficient of thermal expansion of 3.1 ppm/° C., and a glass transition temperature of 575° C.;
• a fifteenth sealing glass having a density of 2.33 g/cc, a softening point of 717° C., and a coefficient of thermal expansion of 4.3 ppm/° C.;
• a sixteenth sealing glass having a density of 2.34 g/cc, a softening point of 719° C., a coefficient of thermal expansion of 4.7 ppm/° C., and a glass transition temperature of 544° C.;
• a seventeenth sealing glass having a density of 2.55 g/cc, a softening point of 726° C., a coefficient of thermal expansion of 5.9 ppm/° C., and a glass transition temperature of 650° C.;
• or an eighteenth sealing glass having a density of 2.72 g/cc, a softening point of 862° C., a coefficient of thermal expansion of 5.2 ppm/° C., and a glass transition temperature of 717° C.;
• applying the multiphase glass slurry to an outer surface of a carbon-carbon composite structure;
• and
• heating the carbon-carbon composite structure to a temperature sufficient to adhere the multiphase glass slurry to the carbon-carbon composite structure.