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Carbon/carbon composite and titanium alloy welding method

A carbon-carbon composite material and welding method technology, applied in welding equipment, non-electric welding equipment, metal processing equipment and other directions, can solve the problem of not being able to weld carbon-carbon composite materials and titanium alloys in large areas.

Inactive Publication Date: 2008-03-26
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiency that the existing technology cannot weld carbon-carbon composite materials and titanium alloys in a large area, the present invention provides a welding method for carbon-carbon composite materials and titanium alloys, which can realize high-strength connection between carbon-carbon composite materials and titanium alloys

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: The welding area is 900mm 2 Welding of carbon / carbon composites with commercially pure titanium TA3.

[0014] A Ti foil with a thickness of 0.018 μm and a Cu foil with a total thickness of 0.4 μm were selected.

[0015] Grind the surface of the carbon / carbon composite material to be welded, and ultrasonically clean it in absolute ethanol solvent to remove oil and dirt and rinse it clean. Clean the Cu foil ultrasonically in absolute ethanol solvent. Pickling Ti foil and industrial pure titanium TA3 to remove the surface oxide film, and together with Cu foil, ultrasonic cleaning in deionized water to clean.

[0016] After drying, the carbon / carbon composite material, Ti foil, Cu foil and industrial pure titanium TA3 are clamped before welding, combined into a welding structure of carbon / carbon composite material + Ti / Cu+TA3, and placed in a vacuum diffusion welding furnace Between the inner upper and lower pressure heads, a pre-pressure is applied to comp...

Embodiment 2

[0019] Embodiment 2: The welding area is 1200mm 2 Welding of carbon / carbon composites with Ti-6Al-4V titanium alloy.

[0020] A Ti foil with a thickness of 0.03 μm and a Cu plate with a thickness of 0.6 μm were selected.

[0021] Grinding, cleaning, and clamping methods are the same as in Example 1.

[0022] Close the door of the vacuum chamber and evacuate to 6.3×10 -3 Pa, apply a welding pressure of 0.08MPa, and maintain it, then raise the temperature to a welding temperature of 960°C at a rate of 7°C / min, and keep it warm for 10 minutes to realize instantaneous liquid phase diffusion welding between the carbon / carbon composite material and the intermediate layer; then weld The pressure was raised to 3MPa and kept for 30 minutes to achieve diffusion welding between the intermediate layer and the titanium alloy. Finally, after cooling down to 500°C at a rate of 6°C / min, the pressure was released and cooled to room temperature with the furnace.

[0023] After welding, the ...

Embodiment 3

[0024] Embodiment 3: The welding area is 1600mm 2 Welding of carbon / carbon composites with Ti-3Al-7Mo-11Cr titanium alloy.

[0025] A Ti foil with a thickness of 0.16 μm and a Cu plate with a thickness of 0.8 μm were selected.

[0026] Grinding, cleaning, and clamping methods are the same as in Example 1.

[0027] Close the door of the vacuum chamber and evacuate to 6.3×10 -3 Pa, apply a welding pressure of 0.1MPa, and keep it, then raise the temperature to a welding temperature of 1000°C at a rate of 5°C / min, and keep it warm for 20 minutes to realize instantaneous liquid phase diffusion welding between the carbon / carbon composite material and the intermediate layer; then weld The pressure was raised to 4MPa and kept for 40 minutes to achieve diffusion welding between the intermediate layer and the titanium alloy. Finally, after cooling down to 500°C at a rate of 5°C / min, the pressure was released and cooled to room temperature with the furnace.

[0028] After welding, th...

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Abstract

A welding method for C / C composition and Ti alloy includes such steps as overlapping the Ti foil and Cu foil (or sheet) to obtain intermediate Ti / Cu layer, cleaning the surfaces to be welded and the foils, combining them to become a C / C composition +Ti / Cu+ Ti alloy structure, putting it between upper and lower pressing heads in vacuum-diffusion welding furnace, pre-pressing, vacuumizing, applying weld pressure, heating to 910-1000 deg.C, holding to temp for 5-20 min, increasing weld pressure, holding the pressure for 5-20 min, cooling to 500 deg.C, releasing pressure and cooling. It has large welded area.

Description

technical field [0001] The invention relates to a welding method of a carbon-carbon composite material and a titanium alloy. Background technique [0002] Carbon fiber toughened carbon-based composite materials (hereinafter referred to as carbon-carbon composite materials) are a new generation of strategic thermal structural materials, with fast heat dissipation (high thermal conductivity), slow temperature rise (high specific heat capacity), high temperature resistance, light weight, and good durability. Advantages, it is suitable for manufacturing high-speed vehicles and aircraft brake components, missile heads, rocket nose cones and nozzle throat linings, space shuttle nose cones and wing leading edges, and turbine engine components, etc. Welding carbon-carbon composite materials and metals together can make full use of their complementary advantages with metals in terms of performance and processing, and meet the requirements of high performance and precision in parts ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/16B23K20/22B23K20/02B23K20/24
Inventor 李京龙张赋升熊江涛王忠平李贺军席琛
Owner NORTHWESTERN POLYTECHNICAL UNIV
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