A method for vacuum scattering and joining-up carbon-carbon composite material

A carbon composite material and vacuum diffusion technology, which is applied in the field of carbon/carbon composite material welding, can solve problems such as high connection temperature, poor joint performance, and large metal deformation

Inactive Publication Date: 2009-07-15
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for vacuum diffusion bonding carbon / carbon composite materials in order to solve the problems of high bonding temperature, large metal deformation at local joints and poor joint performance in the existing method of diffusion bonding carbon / carbon composite materials

Method used

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  • A method for vacuum scattering and joining-up carbon-carbon composite material
  • A method for vacuum scattering and joining-up carbon-carbon composite material
  • A method for vacuum scattering and joining-up carbon-carbon composite material

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specific Embodiment approach 1

[0008] Specific embodiment 1: The method of vacuum diffusion bonding carbon / carbon composite material in this embodiment is implemented in the following steps: 1. The surface of the base material is cleaned before diffusion bonding; 2. The diffusion bonding intermediate layer is evenly placed to be welded The connecting surface of the base material; the diffusion bonding intermediate layer is hydrogenated titanium or titanium alloy foil, and the thickness of the diffusion bonding intermediate layer is 30-100μm; 3. The clamped weldment is placed in a vacuum diffusion welding machine for heating, The vacuum degree is 1.33×10 -3 ~4.0×10 -3 Diffusion bonding is carried out under Pa vacuum conditions; 4. After the welding is completed, the weldment is decompressed when the temperature is lowered to 100°C under the original vacuum condition, and the weldment is taken out when the temperature is lowered to room temperature.

[0009] In this implementation method, the diffusion bonding pr...

specific Embodiment approach 2

[0010] Specific embodiment two: this embodiment is different from specific embodiment one in that in step one, the surface of the base material is cleaned by physical cleaning, chemical cleaning or first physical cleaning and then chemical cleaning; the physical cleaning is followed by 400 # , 500 # , 600 # , 800 # And 1000 # The metallographic sandpaper is polished step by step; the chemical cleaning is to prepare the corresponding corrosive liquid according to the difference of the base material to remove the adsorption layer, impurities or oxide film on the surface of the base material, and then wipe the surface of the base material to be welded with acetone or remove the base material. The material is cleaned by ultrasonic in the acetone solution. The other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0011] Specific embodiment three: The difference between this embodiment and specific embodiment one is that the thickness of the diffusion bonding intermediate layer in step two is 30-80 μm. The other steps and parameters are the same as in the first embodiment.

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Abstract

The invention relates to a method for joining carbon / carbon composite materials by vacuum diffusion, which belongs to the field of carbon / carbon composite material welding. The invention solves the problems of high connection temperature, large metal deformation at local joints and poor performance of joints in the existing method for diffusion jointing carbon / carbon composite materials. The steps of the present invention are as follows: 1. Clean the surface of the base metal; 2. Place the diffusion intermediate layer evenly on the connecting surface of the base material to be welded; 3. Diffusion connect the clamped weldment; 4. Cool down , that is, the connected weldment is obtained. The diffusion connection temperature of the present invention is reduced by 100-300°C, and the shear strength of the diffusion-connected carbon / carbon composite material and carbon / carbon composite material and carbon / carbon composite material and other metal materials of the present invention is increased by 20-220%. There is no obvious deformation of the metal.

Description

Technical field [0001] The invention belongs to the field of carbon / carbon composite material welding, and is suitable for the connection of carbon / carbon composite materials and other dissimilar materials. Background technique [0002] Carbon / carbon composite material has a low density (about 2.0g / cm 3 ), light weight, high modulus, high specific strength, low thermal expansion coefficient, high temperature resistance, thermal shock resistance, corrosion resistance, good vibration absorption, etc., which are extremely important for future defense and aerospace competition and development. When carbon / carbon composite materials are used in engineering applications, they need to be made into components, which will inevitably encounter welding problems, including their own welding and welding with other materials. The special crystal structure and physical and chemical properties of carbon / carbon composite materials make it difficult to connect. First, the chemical structure of car...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/16B23K20/24
Inventor 何鹏冯吉才刘宏王伦王明
Owner HARBIN INST OF TECH
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