Carbon/carbon composite material sealing ring and production method thereof
A technology of carbon composite materials and production methods, which is applied in the field of wear-resistant sealing parts, and can solve problems affecting the quality of rubber mixing
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Embodiment 1
[0025] Depend on figure 1 It can be seen that a carbon / carbon composite sealing ring is made of carbon fiber through blanking-densification-machining, and the apparent density of the sealing ring is 1.2g / cm 3 ~2.0g / cm 3 (the present embodiment is 1.56g / cm 3 ).
[0026] A method for producing a carbon / carbon composite seal ring as above, comprising the following steps:
[0027] (1) Billet making: select short carbon fibers with a length of 6mm-70mm, and open them into fluffy needle-like fibers through an opening device, then air-laid and / or combed the opened carbon fibers into a net, and then use the net to lay The machine is laid into a fiber net and prepunched into a mesh tire. The mesh tire and carbon cloth made of carbon fiber are laminated and compounded by needling according to the required density to make a plate-like or ring-shaped prefabricated body (ring-shaped in this embodiment). The apparent density of the preform is 0.3g / cm 3 ~0.7g / cm 3 (the present embodim...
Embodiment 2
[0032] The apparent density of the sealing ring is 1.8g / cm 3 .
[0033] In order to shorten the production cycle and reduce costs in this embodiment, in step (2), after carrying out 2 cycles of chemical vapor deposition densification, the green body is put into an impregnation furnace and immersed in a thermoplastic resin (furan resin in this embodiment) ) for impregnation curing and densification. The apparent density of the green body after chemical vapor deposition densification reaches 1.2g / cm 3 , and then put the green body into the impregnation furnace for impregnation, solidification and densification, so that the apparent density of the green body reaches 1.8g / cm 3 , after graphitization treatment, made green body.
[0034] In impregnation curing and densification, the immersion temperature is 50°C-80°C, the pressure is 1MPa-3MPa, the immersion time is 1.5h-4h; the curing temperature is 160°C-230°C, the pressure is 1MPa-3MPa, and the curing time is 1.5h- 4h, 1 to 3 c...
Embodiment 3
[0039] In order to reduce the production cost of the carbon / carbon composite sealing ring and improve the comprehensive performance, the friction surface and the ring body of the sealing ring adopt density gradient setting.
[0040] A carbon / carbon composite sealing ring, the sealing ring includes a friction surface 1 and a ring body 2, both of the friction surface 1 and the ring body 2 are made of carbon fiber through blank making-densification-machining, the surface of the friction surface 1 of the sealing ring The apparent density is 1.5g / cm 3 ~2.0g / cm 3 (the present embodiment is 1.8g / cm 3 ), the apparent density of ring body 2 is 1.2g / cm 3 ~1.8g / cm 3 (the present embodiment is 1.5g / cm 3 ).
[0041] A method for producing a carbon / carbon composite seal ring as above, comprising the following steps:
[0042] (1) Billet making: select short carbon fibers with a length of 6mm-70mm, and open them into fluffy needle-like fibers through an opening device, then air-laid and...
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Abstract
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