Carbon-carbon composite material ring for hot pressed sintering and preparation method thereof

Abstract

The invention discloses a carbon-carbon composite material ring for hot pressed sintering and a preparation method thereof. Firstly, high-strength carbon fiber yarn impregnated with phenolic resin is wound on the outer side of a steel mold core with the taper of 1-5 degrees, after winding is conducted by 2-10 mm, carbon fiber cloth impregnated with phenolic resin is wound by 1-3 mm, the breadth of the carbon fiber cloth is the same as the height of the mold, and the carbon fiber cloth and the carbon fiber yarn are wound repeatedly and alternately. After winding to a preset thickness, the mold is heated and cured. The cured carbon fiber reinforced phenolic resin material ring is taken down from the steel mold and sleeves on an expanding and inner diameter expanding mold, then is put into a hot-pressing sintering furnace, slowly heated and carbonized to 600 DEG C or above in the presence of flowing nitrogen, and slowly pressurized while slowly heated and carbonized, the maximum pressure is increased to 25-35 Mpa and is kept until the carbonization is finished; and after cooling, discharging from the furnace, the carbon-carbon composite material ring is taken down, dipped in the phenolic resin again, and heated and cured after dipping so as to obtain the carbon-carbon composite material ring for hot pressed sintering.

Description

technical field [0001] The invention belongs to the technical field of carbon-carbon composite material preparation, and in particular relates to a carbon-carbon composite material ring for hot pressing sintering and a preparation method thereof. Background technique [0002] Hot pressing sintering is a very important sintering process for advanced materials such as special ceramics, ceramic matrix composites, and powder metallurgy products. Hot-pressing sintering samples are a technological measure with the best product performance among various sintering methods, and some special-purpose materials and devices can only be manufactured by hot-pressing sintering process. [0003] In the hot press sintering process, the sintered powder is preformed or directly put into a mold made of graphite and other materials without preforming, and then the whole system is placed inside the hot press sintering furnace. While the temperature is rising and sintering, the hydraulic piston ou...

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Problems solved by technology

[0008] In the past, CN200510019593.7 did not have the step of expanding the inner diameter, and the phenolic resin between the fiber yarns was carbonized to leave a space, which could not be completely filled in the subsequent re-impregnation process, and even if it was filled, it would still be carbonized to form spaces in the subsequent use process, resulting in In the later hot pressing and sintering process of the ring, under the strong tensile stress of the inner ring layer, the inner diameter will gradually become larger

Due to the hot pressing process, the pressure will be relatively large in the middle and later stages of hot pressing. At this time, the blank has been compressed to a large extent, resulting in only the middle part of the ring being subjected to a large expansion force, resulting in uneven deformation of the ring, making the The carbon-carbon composite ring made according to CN200510019593.7 has early deformation and short service life

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