Environmental barrier coating
AssigneeRtx Corporation
InventorsZhongfen Ding, Xia Tang, Michael R. Kracum, Richard Wesley Jackson, James T. Beals
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Abstract
An article includes a ceramic-based substrate and a barrier layer on the ceramic-based substrate. The barrier layer includes a matrix of SiO2 and a dispersion of silicon oxycarbide particles in the matrix. The silicon oxycarbide particles have Si, O, and C in a covalently bonded network, and a dispersion of barium-magnesium alumino-silicate particles in the matrix. The barium-magnesium alumino-silicate particles have an average maximum dimension that is between about 10-40% of an average maximum dimension of the silicon oxycarbide particles. A composite material and a method of applying a barrier layer to a substrate are also disclosed.
Claims16
An article comprising:
- a ceramic-based substrate;
- and
- a barrier layer on the ceramic-based substrate, the barrier layer including a matrix of SiO2, a dispersion of silicon oxycarbide particles in the matrix, the silicon oxycarbide particles having Si, O, and C in a covalently bonded network, and a dispersion of barium-magnesium alumino-silicate particles in the matrix, the barium-magnesium alumino-silicate particles having an average maximum dimension that is between about 10-40% of an average maximum dimension of the silicon oxycarbide particles, wherein the average maximum dimension of the barium-magnesium alumino-silicate particles is between about 8-15% of an average distance between adjacent barium-magnesium alumino-silicate particles, and the barium-magnesium alumino-silicate particles are classified and exclude small particles that have a maximum dimension of less than 1 micrometer.
A composite material comprising:
- a matrix of SiO2;
- a dispersion of silicon oxycarbide particles in the matrix, the silicon oxycarbide particles having Si, O, and C in a covalently bonded network;
- and
- a dispersion of barium-magnesium alumino-silicate particles, in the matrix, the barium-magnesium alumino-silicate particles having an average maximum dimension that is between about 10-40% of an average maximum dimension of the silicon oxycarbide particles, wherein the average maximum dimension of the barium-magnesium alumino-silicate particles is between 8-15% of the average distance between adjacent barium-magnesium alumino-silicate particles, and the barium-magnesium alumino-silicate particles are classified and exclude small particles that have a maximum dimension of less than 1 micrometer.
Dependencies are inferred from the claim text.