Novel ultrahigh-temperature ceramic integrally-modified anti-ablation carbon/carbon composite material and preparation method thereof
A technology of carbon composite materials and ultra-high temperature ceramics, which is applied in the field of new ultra-high temperature ceramic integrated modified anti-ablation carbon/carbon composite materials and its preparation, to achieve good anti-oxidation properties, improve thermal shock resistance, and relieve thermal stress Effect
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[0040] It is prepared by mixing zirconium powder and titanium powder with a purity greater than 99.9% at an atomic ratio of 80:20, and then ball milling on a high-energy planetary ball mill. The ball milling speed is 400r / min, the ball milling time is 10h, the ball-to-material ratio is 5, and the ball milling medium is absolute ethanol. The ball-milled powder was dried in a vacuum oven at 80° C. for 8 hours before being used in subsequent steps.
[0041] Set the density to 0.42g.cm -3 The carbon fiber needle-punched integral felt is subjected to high-temperature heat treatment to remove the organic glue on the surface of the fiber and release the stress. The treatment temperature is 2200°C, and the holding time is 1h.
[0042] The heat-treated felt is placed in a chemical vapor deposition furnace to deposit pyrolytic carbon, and the carbon fiber felt is densified to prepare a porous carbon / carbon composite material. The densified porous carbon / carbon composite has a density...
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