Thermal insulation materials suitable for use at high temperatures, and process for making said materials
AssigneeMersen Scotland Holytown Limited
InventorsIan Bartlett, Marcin Toda
Life of this patent
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Abstract
A process for making a thermal insulation material based on carbon and which includes carbon fibers, suitable for use at temperatures above 1,500° C. The process includes providing carbon fibers with embedded carbon black particles; cutting or milling said carbon fibers to obtain short carbon filaments; preparing a slurry by introducing the short carbon filaments in a liquid phase that includes a binder capable of forming a carbon residue upon pyrolysis under non-oxidizing conditions; casting the slurry into a mold capable of separating the slurry into a wet green body and a liquid phase; and drying and heat treating the wet green body to obtain a thermal insulation material.
Claims11
A process for making a thermal insulation material comprising carbon fibers, the process comprising:
- providing carbon fibers with embedded carbon black particles;
- cutting or milling the carbon fibers with the embedded carbon black particles to obtain short carbon filaments with an average length not exceeding about 2,000 μm;
- preparing a slurry by introducing the short carbon filaments in a liquid phase having a pyrolysable binder dissolved or dispersed therein such that the pyrolysable binder is distributed over substantially all surfaces of the short carbon filaments and does not accumulate only on contact points of the short carbon filaments;
- casting said slurry into a mold composed of a porous material to deposit the short carbon filaments in the mold and thereby form a wet green body;
- and
- drying the green body and then heat treating the wet green body under non-oxidizing conditions to obtain the thermal insulation material.
Dependencies are inferred from the claim text.