A fast densification method for carbon/carbon composites

A carbon composite material and composite material technology are applied in the field of rapid preparation of carbon/carbon composite materials to achieve the effect of improving densification efficiency

Active Publication Date: 2016-06-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The use of spark plasma sintering (SPS) to achieve rapid densification of C / C composites has not been reported in the relevant literature

Method used

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  • A fast densification method for carbon/carbon composites
  • A fast densification method for carbon/carbon composites

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Set the initial density to 0.19g / cm 3 The carbon fiber full mesh felt is densified to 0.9g / cm by CVI 3 , control the pyrolytic carbon microstructure of the substrate to rough layer structure pyrolytic carbon; CVI process parameters are: temperature: 1180 °C; pressure: 15KPa; propylene flow rate: 6.0L / min; nitrogen flow rate: 9L / min; time: 50h.

[0039] (2) The carbon / carbon composite material is machined into a workpiece with a diameter of 40 mm and a height of 10 mm, which is loaded into a graphite mold in an SPS furnace and pre-pressed with a force of 5KN to keep the surface of the sample flat.

[0040] (3) Using SPS furnace, vacuumize to 10 -2 After Pa, the carbon / carbon composite material is rapidly heated to a temperature of 1700°C, then slowly pressurized to a pressure of 31MPa, the temperature rise rate is controlled to be 140°C / min, and the pressurization rate is 0.5MPa / min;

[0041] (4) Insulation and pressure holding for 25 minutes, cooling and pressure ...

Embodiment 2

[0043] (1) Set the initial density to 0.15g / cm 3 The carbon fiber full mesh tire felt is densified to 1.32g / cm by CVI 3 , control the pyrolytic carbon microstructure of the substrate to rough layer structure pyrolytic carbon; CVI process parameters are: temperature: 1190 °C; pressure: 12kPa; propylene flow rate: 5.0L / min; nitrogen flow rate: 8L / min; time: 80h.

[0044](2) The carbon / carbon composite material is machined into a workpiece with a diameter of 40 mm and a height of 10 mm, which is loaded into a graphite mold in an SPS furnace and pre-pressed with a force of 5KN to keep the surface of the sample flat.

[0045] (3) Using SPS furnace, vacuumize to 10 -2 After Pa, the carbon / carbon composite material is rapidly heated to a temperature of 2000°C, then slowly pressurized to a pressure of 35MPa, and the temperature rise rate is controlled to be 120K / min, and the pressurization rate is 0.6MPa / min;

[0046] (4) Insulation and pressure holding for 30 minutes, cooling and p...

Embodiment 3

[0048] (1) Set the initial density to 0.2g / cm 3 The carbon fiber full mesh felt is densified to 1.15g / cm by CVI 3 , control the pyrolytic carbon microstructure of the substrate to rough layer structure pyrolytic carbon; CVI process parameters are: temperature: 1200 °C; pressure: 12kPa; methane flow rate: 7.0L / min; nitrogen flow rate: 11L / min; time: 70h.

[0049] (2) The carbon / carbon composite material is machined into a workpiece with a diameter of 40 mm and a height of 10 mm, which is loaded into a graphite mold in an SPS furnace and pre-pressed with a force of 5KN to keep the surface of the sample flat.

[0050] (3) Using SPS furnace, vacuumize to 10 -2 After Pa, the carbon / carbon composite material is rapidly heated to a temperature of 2100°C, then slowly pressurized to a pressure of 38MPa, and the temperature increase rate is controlled to be 180K / min, and the pressurization rate is 0.8MPa / min;

[0051] (4) Insulation and pressure holding for 15 minutes, cooling and pre...

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Abstract

The invention discloses a rapid densification method of a carbon / carbon composite material. The rapid densification method comprises the following steps: (1) densifying a carbon fiber full-mesh felt with an initial density of 0.15-0.20 g / cm<3> to 0.8-1.5 g / cm<3>, and controlling the pyrolytic carbon microstructure of a matrix as a rough layer structure pyrolytic carbon; (2) vacuumizing to 10<-2> Pa by adopting an SPS furnace, rapidly heating the carbon / carbon composite material to 1600-2200 DEG C, slowly pressurizing to 30-40 MPa, controlling the heating speed within 100-200 DEG C / min and controlling the pressurizing speed within 0.5-1 MPa / min; (3) preserving the heat and the pressure for 10-30 min, cooling, releasing the pressure, controlling the cooling speed within 80-100 DEG C / min and controlling the pressure releasing speed within 1-2 MPa / min so as to finish the densification process of the carbon / carbon composite material and prepare a pyrolytic carbon-based carbon / carbon composite material with a density of 1.6-1.8 g / cm<3>.

Description

technical field [0001] The invention relates to a rapid preparation method of carbon / carbon composite materials, in particular to a rapid preparation method of high-density pyrolytic carbon-based carbon / carbon composite materials Background technique [0002] Carbon / carbon composite is an advanced composite material with carbon fiber reinforced carbon matrix. Its performance depends on the type and structure of carbon fiber and matrix carbon, and the type of matrix carbon has an important impact on the performance of composite materials. There are three main types of matrix carbon: pyrolytic carbon, resin carbon or pitch carbon. Among them, pyrolytic carbon is a matrix carbon with excellent performance. It is obtained by cracking carbon-containing organic gas at high temperature, and is composed of nano-carbon crystallites microscopically. , dense and uniform structure. Pyrolytic carbon-based carbon / carbon composites have excellent comprehensive properties such as high spec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/83
Inventor 张福勤刘怡郑吉祥王星星黎炳前夏莉红
Owner CENT SOUTH UNIV
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