Coal tar and hydrocarbon mixture pitch and the preparation and use thereof
View Patent ↗A method of making the saturated aircraft brake preform using a coal tar pitch having a softening point in the range of about 160° C. to 240° C. Also, a product having natural rubber in the formulation and the method of making the product using a coal tar pitch having a softening point in the range of about 140° C. to 200° C. A mesophase pitch is formed from quinoline insoluble free coal tar pitch distillate from a high efficiency evaporative distillation process.
1. A method of making a saturated aircraft brake preform comprising:
placing a carbon fiber preform under a vacuum;
heating the carbon fiber preform;
introducing coal tar pitch having a softening point in the range of about 160° C. to 240° C. into the carbon fiber preform;
pressurizing the coal tar pitch saturated carbon fiber preform with nitrogen;
cooling the saturated carbon fiber preform;
processing the saturated carbon fiber preform by chemical vapor infiltration.
2. The method of claim 1 wherein the coal tar pitch has a softening point in the range of about 170° C. to 220° C.
3. The method of claim 1 wherein the coal tar pitch has a softening point in the range of about 180° C. to 200° C.
4. A mesophase pitch formed from quinoline insoluble free coal tar pitch distillate from a high efficiency evaporative distillation process.