Rapid densification method for thin-wall cylindrical carbon/carbon composite material
A technology of carbon composite materials and thin-walled tubes, which is applied in the field of rapid preparation of thin-walled cylindrical carbon/carbon composite materials, and can solve problems such as good product uniformity, thin-walled tubes are easy to deform, and complex production processes
Active Publication Date: 2021-08-20
宏德新材料科技(葫芦岛)股份有限公司
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Problems solved by technology
The existing densification process mostly adopts the isothermal chemical vapor infiltration method, and the densification period is as long as 700h, but the product uniformity is good; the temperature gradient method increases the densification rate, but the product is easy to deform, especially when making thin-walled cylindrical parts with a wall thickness of ≤10mm , the thin-walled cylinder made by the temperature gradient method is easily deformed, the production process is complicated, and the production cost is high
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[0026] In order to fully understand the purpose, features and effects of the present invention, the present invention will be described in detail through the following specific embodiments, but the present invention is not limited thereto.
[0027] see figure 1 , a chemical vapor infiltration device for preparing cylindrical carbon / carbon composite materials, which consists of a base 1, a cylinder body 2, a prefabricated body 3, an air outlet core 4, a T-shaped end cover 5, a top cover 6 and a positioning sleeve 7, and the base 1 is a disc structure, the lower end of the cylinder body 2 is sleeved on the outside of the base 1, so that the inner wall of the cylinder body 2 and the outer wall of the base 1 are in clearance fit. Air intake holes 11 are evenly distributed on the base 1, and positioning holes 12 are concentrically arranged on the upper side of the air intake holes 11, so that the air intake holes 11 and the positioning holes 12 are connected to form a stepped struc...
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Abstract
The invention discloses a rapid densification method for a thin-wall cylindrical carbon / carbon composite material, and relates to the field of carbon / carbon composite material preparation methods. Rapid densification is carried out in a two-stage pressure difference mode, and densification is completed mainly in a shaping stage and a densification stage. In the shaping period, a gas outlet mold core made of graphite is placed in a prefabricated body, it is guaranteed that the thin-wall prefabricated body does not deform, the effect of uniformly dispersing gas is achieved, the gas is mainly discharged from gaps of the prefabricated body, co-deposition is conducted for 30-50 h, and pyrolytic carbon of a rough layer structure is deposited till the density is 1.0 g / cm < 3 >; and in the densification period, the gas outlet mold core is taken out, the deposition rate is increased, the size precision of the gas outlet mold core is not affected, deposition is conducted for 70-100 h, and the carbon / carbon composite material with the density being 1.75-1.80 g / cm < 3 > is deposited. Each prefabricated body can form an independent deposition chamber, and graphite cylinders are applied to the outer sides of the cylindrical prefabricated bodies to form a large deposition chamber again, so that a two-stage pressure gradient is established in the radial direction of the prefabricated bodies, and the utilization rate of reaction gas is increased to 35-60% and is about 10 times higher than that of an isothermal method.
Description
technical field [0001] The invention relates to the technical field of preparation of carbon / carbon composite materials, in particular to a rapid preparation method of thin-walled cylindrical carbon / carbon composite materials. Background technique [0002] Carbon / carbon composites are high-performance composite materials composed of high-strength carbon fibers and pyrolytic carbon matrix. Carbon / carbon composites are widely used in friction materials due to their excellent high and low temperature mechanics, thermal conductivity and self-lubricating properties. Therefore, this material is especially suitable for bearing cages used in special working conditions, such as extremely low or extremely high ambient temperature. [0003] At present, the main preparation methods of carbon / carbon composites are chemical vapor infiltration method, liquid phase impregnation method and the combined use of the two methods. However, the liquid phase impregnation method has the disadvanta...
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IPC IPC(8): C04B35/83C04B35/52C04B35/622
CPCC04B35/83C04B35/52C04B35/622C04B2235/656C04B2235/6567C04B2235/77
Inventor 杨闯范永中刘冬玲陈晓磊陈贺程兆亮
Owner 宏德新材料科技(葫芦岛)股份有限公司