Infiltrating boron nitride into a carbon-carbon substrate
AssigneeGoodrich Corporation
InventorsJecee Jarman, Lauren Bartolo
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Abstract
A method is provided for forming a carbon/carbon (C/C) disk with boron nitride (BN) doping. Borazine is generated using a set of borazine precursors. Starting carbon fibers are coated or impregnated with the borazine in an inert atmosphere. The starting carbon fibers are needled into layered fabric and the layered fabric is needled into boards from which a preform is cut, the needling and cutting performed in the inert atmosphere. The borazine in the preform is stabilized to convert the borazine to polyborazylene. The polyborazylene in the preform is cured. The polyborazylene in the preform is then crystalized to form BN particulates. The preform with the BN particulates is carbonized and then densified with pyrolytic carbon.
Claims20
A method for forming a carbon/carbon (C/C) disk with boron nitride (BN) doping, the method comprising:
- generating borazine using a set of borazine precursors;
- coating or impregnating starting carbon fibers with the borazine in an inert atmosphere, wherein an amount of borazine used to coat or infiltrate the starting carbon fibers is between 0.05 percent to 25 percent of a total weight of the starting carbon fibers;
- needling the starting carbon fibers into layered fabric and then needling the layered fabric into boards from which a preform is cut, the needling and cutting performed in the inert atmosphere;
- stabilizing the borazine in the preform to convert the borazine to polyborazylene, wherein the stabilizing is performed by heating the preform at a first temperature for a first predetermined time period, wherein the first temperature is between 40° C. (104° F.) to 60° C. (140° F.);
- curing the polyborazylene in the preform;
- crystalizing the polyborazylene in the preform to form BN particulates, wherein the crystalizing is performed by heating the preform at a second temperature for a second predetermined time period, causing the polyborazylene to form the BN particulates;
- and
- densifying the BN particulates in the preform with pyrolytic carbon.
A method for forming a carbon/carbon (C/C) disk with boron nitride (BN) doping, the method comprising:
- generating borazine using a set of borazine precursors;
- coating or impregnating a carbonized carbon preform with the borazine in an inert atmosphere, wherein an amount of borazine used to coat or infiltrate the carbonized carbon preform is between 0.05 percent to 25 percent of a total weight of the carbonized carbon preform;
- stabilizing the borazine in the carbonized carbon preform to convert the borazine to polyborazylene, wherein the stabilizing performed by heating the carbonized carbon preform at a first temperature for a first predetermined time period, wherein the first temperature is between 40° C. (104° F.) to 60° C. (140° F.);
- curing the polyborazylene in the carbonized carbon preform;
- crystalizing the polyborazylene in the carbonized carbon preform to form BN particulates, wherein the crystalizing is performed by heating the preform at a second temperature for a second predetermined time period, causing the polyborazylene to form the BN particulates;
- and
- densifying the BN particulates in the carbonized carbon preform with pyrolytic carbon.
A method for forming a carbon/carbon (C/C) disk with boron nitride (BN) doping, the method comprising:
- needling uncoated starting carbon fiber into layered fabric and then needling the layered fabric into boards from which a preform is cut, the needling and cutting performed without BN doping;
- carbonizing the preform made of uncoated carbon fibers to form a carbonized carbon preform;
- densifying the carbonized carbon preform with pyrolytic carbon thereby create a densified C/C disk;
- generating borazine using a set of borazine precursors;
- coating or impregnating the densified C/C disk with the borazine in an inert atmosphere, wherein an amount of borazine used to coat or infiltrate the densified C/C disk is between 0.05 percent to 25 percent of a total weight of the densified C/C disk;
- stabilizing the borazine in the densified C/C disk to convert the borazine to polyborazylene, wherein the stabilizing performed by heating the preform at a first temperature for a first predetermined time period, wherein the first temperature is between 40° C. (104° F.) to 60° C. (140° F.);
- curing the polyborazylene in the densified C/C disk;
- and
- crystalizing the polyborazylene in the densified C/C disk to form BN particulates, wherein the crystalizing is performed by heating the preform at a second temperature for a second predetermined time period, causing the polyborazylene to form the BN particulates.
Dependencies are inferred from the claim text.