Search

CN-121990839-A - Method for preparing C/C-SiC composite material by multistage recovery of carbon/carbon composite material processing waste

CN121990839ACN 121990839 ACN121990839 ACN 121990839ACN-121990839-A

Abstract

The invention discloses a method for preparing a C/C-SiC composite material by multistage recovery of carbon/carbon composite material processing waste, and belongs to the technical field of preparation of C/C composite materials. The method comprises the steps of carrying out multistage screening treatment on carbon/carbon composite material processing waste, screening and separating short carbon fibers and pyrolytic carbon powder, mixing the screened short carbon fibers and pyrolytic carbon powder with phenolic resin, industrial silicon powder and SiC powder, preparing fiber reinforced resin blocks in a mould pressing mode, and carrying out one-step continuous carbonization and ceramic heat treatment on the fiber reinforced resin blocks to finally obtain the C/C-SiC composite material. The invention realizes the high added value recycling of the C/C processing waste, has simple process, low cost and convenient operation, solves the problems of resource waste and environmental pollution caused by the existing waste treatment, and the prepared C/C-SiC composite material has excellent performance and can be widely applied to the fields of aerospace, high-end manufacturing and the like.

Inventors

  • ZHOU LEI
  • LIU CHIYU
  • Wei yalong
  • ZHANG CONG
  • WANG CHEN

Assignees

  • 无锡博智复合材料有限公司

Dates

Publication Date
20260508
Application Date
20260304

Claims (10)

  1. 1. A method for preparing a C/C-SiC composite material by multistage recovery of carbon/carbon composite material processing waste material is characterized by comprising the steps of carrying out multistage screening on the carbon/carbon composite material processing waste material, screening short carbon fibers and pyrolytic carbon powder, mixing the short carbon fibers, the pyrolytic carbon powder, phenolic resin, industrial silicon powder and SiC powder in a mould pressing mode to obtain mixed powder, pressing the mixed powder into a fiber reinforced resin block, and carrying out one-step continuous carbonization and ceramic heat treatment on the fiber reinforced resin block to obtain the C/C SiC composite.
  2. 2. The method for preparing the C/C-SiC composite material by recycling the carbon/carbon composite material processing waste in multiple stages according to claim 1, wherein the mesh number of each screen of the multiple stages of screening is gradually increased.
  3. 3. A method of preparing a C/C-SiC composite in multiple stages from carbon/carbon composite processing waste according to claim 2, wherein the multiple stages of sieving include three stages of sieving.
  4. 4. The method for preparing the C/C-SiC composite material by recycling the carbon/carbon composite material processing waste in multiple stages according to claim 2, wherein the first-stage screen is 10-18 meshes, the second-stage screen is 18-200 meshes and the third-stage screen is 300 meshes.
  5. 5. The method for preparing the C/C-SiC composite material by multistage recovery of the carbon/carbon composite material processing waste material according to claim 1, wherein the mixed powder comprises, by volume, 5% -20% of short carbon fibers, 25% -55% of pyrolytic carbon powder, 10% -30% of phenolic resin, 10% -30% of industrial silicon powder and 5% -10% of SiC powder.
  6. 6. The method for preparing the C/C-SiC composite material by multistage recovery of the carbon/carbon composite material processing waste material, which is disclosed in claim 1, is characterized in that the technological parameters in the pressing process are that the pressing temperature is 150-230 ℃, the pressing pressure is 5-20 MPa, and the pressing time is 20-60 min.
  7. 7. The method for preparing the C/C-SiC composite material by recycling the carbon/carbon composite material processing waste in multiple stages according to claim 1, wherein the continuous carbonization and ceramization heat treatment is performed in one step under the argon atmosphere, and the carrier gas flow is controlled to be 40-80 ml/min.
  8. 8. The method for preparing the C/C-SiC composite material by recycling the carbon/carbon composite material processing waste in multiple steps according to claim 1, wherein the temperature parameter conditions of the one-step continuous carbonization and ceramic heat treatment are that the temperature is raised to 900-1100 ℃ from the room temperature, the temperature is kept for 2-6 hours, the temperature is raised to 1500-1800 ℃ and the temperature is kept for 2-6 hours, the temperature is lowered to 300 ℃ and then the temperature is cooled to the room temperature along with a furnace.
  9. 9. The method for preparing C/C-SiC composite material by multistage recovery of carbon/carbon composite material processing waste material according to claim 1, wherein the prepared C/C The density of the SiC composite material is 2.020+/-0.017 g/cm 3 .
  10. 10. The method for preparing C/C-SiC composite material by multistage recovery of carbon/carbon composite material processing waste material according to claim 1, wherein the prepared C/C The bending strength of the SiC composite material is 41.61 +/-1.24 MPa, the compression strength is 126.71+/-1.48 MPa, the friction coefficient is 0.507+/-0.017, and the wear rate is (1.60+/-0.33) multiplied by 10 -14 m 3 N -1 m -1 .

Description

Method for preparing C/C-SiC composite material by multistage recovery of carbon/carbon composite material processing waste Technical Field The invention belongs to the technical field of carbon/carbon composite material preparation, and particularly relates to a method for preparing a C/C-SiC composite material by multistage recovery of carbon/carbon composite material processing waste. Background Carbon/carbon (C/C) composite materials have become an indispensable key base material in the national strategic industries of aerospace, new energy and high-end manufacturing and the like by virtue of unique high temperature resistance (the composite materials can stably work in a high-temperature environment of more than 1000 ℃ for a long time and can maintain excellent performance even in an inert atmosphere of more than 2000 ℃) and light high-strength characteristics (the density is only 1.3-1.8g/cm < 3 >, and the specific strength and specific modulus are far higher than those of traditional metal materials and ceramic materials). The C/C composite material is widely applied to core components such as an aircraft brake disc, an engine spray pipe, a heat-resistant layer of an aerospace craft and the like in the aerospace field, so that the dead weight of the equipment is greatly reduced, the high-temperature resistance and service reliability of the equipment are improved, the C/C composite material is applied to components such as a fuel cell electrode and a solar thermal power generation heat absorber in the new energy field, the energy conversion efficiency and the equipment service life are effectively improved, and the C/C composite material can be used as a structural member and a wear-resistant component of a precise instrument and a high-speed machine in the high-end manufacturing field, and the severe requirement of the high-end equipment on the material performance is met. However, because of the special preparation process of the C/C composite material, a plurality of core processes such as preform braiding, chemical Vapor Deposition (CVD), liquid phase impregnation carbonization and the like are generally required, and the finally formed product can meet the requirements of dimensional accuracy and surface quality only through a plurality of machining processes such as cutting, grinding, drilling and the like according to the actual application requirements. Because of the structural characteristics of the C/C composite material, phenomena such as fiber breakage, matrix falling and the like are easy to occur in the processing process, so that a large amount of processing waste is inevitably generated. The main components of the C/C composite material processing waste material are short carbon fibers and pyrolytic carbon powder, wherein the short carbon fibers retain excellent mechanical properties of high strength, high modulus and the like of original long carbon fibers, the tensile strength can reach more than 2000MPa, the elastic modulus exceeds 200GPa, the pyrolytic carbon powder is a high-quality reinforcing phase material, and the pyrolytic carbon powder has good lubricity, wear resistance and thermal conductivity, can be used as an excellent tribological material and a matrix filling material, and has extremely high reuse value. However, the treatment mode of the C/C composite material processing waste is rough at present, and the C/C composite material processing waste is mainly treated by adopting a direct discarding or sanitary landfill mode, so that serious environmental pollution and resource waste are caused. In summary, as the application of the C/C composite materials in industry is increasingly widespread, the amount of the processing waste is continuously increased, and the problems of resource waste and environmental pollution caused by the existing rough treatment method are more and more prominent, which becomes a bottleneck for restricting the development of industry. The existing recycling technology has the defects of complex process, high cost, low added value, lack of systemicity and the like, cannot meet the green development requirement of industry, and is difficult to solve the current waste treatment dilemma. Disclosure of Invention In order to overcome the defects of the prior art, the invention aims to provide a method for preparing a C/C-SiC composite material by multi-stage recovery of carbon/carbon composite material processing waste, so as to solve the problems of environmental pollution and resource waste caused by the C/C composite material processing waste in the existing production. In order to achieve the above purpose, the invention is realized by adopting the following technical scheme: the invention discloses a method for preparing a C/C-SiC composite material by multistage recovery of carbon/carbon composite material processing waste, which comprises the steps of carrying out multistage screening on the carbon/carbon composite material processing waste,