Connection method for carbon/carbon, carbon/silicon carbonate composite material and thermal-resisting alloy

A technology of composite materials and heat-resistant alloys, which is applied in the field of connection between carbon/carbon, carbon/silicon carbide composite materials and heat-resistant alloys, can solve the problems of poor shear strength of joints, improve shear strength and weaken adverse effects , the effect of relieving thermal stress

Inactive Publication Date: 2006-10-25
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
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Problems solved by technology

[0004] In order to overcome the deficiency of poor shear strength of welded joints in the prior art, the present invent

Method used

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  • Connection method for carbon/carbon, carbon/silicon carbonate composite material and thermal-resisting alloy
  • Connection method for carbon/carbon, carbon/silicon carbonate composite material and thermal-resisting alloy
  • Connection method for carbon/carbon, carbon/silicon carbonate composite material and thermal-resisting alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: The area to be welded is 600cm 2 Connection of C / SiC composites with Nb-10Hf-1Ti niobium alloy.

[0020] refer to figure 1 , Figure 5 . Use sandpaper to polish the surfaces to be connected of the C / SiC composite material and the Nb-10Hf-1Ti niobium alloy, and remove the oxide film on the surface of the niobium alloy. Use a diamond slow-speed cutting machine to process a rectangular wave groove structure on the surface of the C / SiC composite material to be connected. The height of the rectangle is 1.2mm, the width of the rectangle is 0.28mm, and the interval between the rectangles is 1.4mm. The Ti and Cu foils are selected as the middle layer with a total thickness of 0.56mm, wherein the weight of Ti is 20% of the total weight of the Ti and Cu foils. Clean the Ti foil with Keller reagent for 20 seconds to remove the oxide film on the surface. Clean the C / SiC composite material, Nb-10Hf-1Ti niobium alloy, Ti foil and Cu foil ultrasonically with deioniz...

Embodiment 2

[0022] Embodiment 2: the area to be welded is 1200cm 2 C / SiC composites with molybdenum connections.

[0023] refer to figure 2 , Figure 5 . Use sandpaper to smooth the C / SiC composite material and molybdenum to be connected. And remove the oxide film on the molybdenum surface. The diamond slow-speed cutting machine processes a triangular wave structure on the surface of the C / SiC composite material to be connected. The triangular groove is an isosceles triangle, the base of the isosceles triangle: 0.36mm, the height of the isosceles triangle: 1.1mm, and the center distance of the groove: 1.2mm; Ti and Ni foils are selected as the middle layer, with a total thickness of 0.45mm, and the weight percentage of Ti is 63%. Clean the Ti foil with Keller reagent for 20 seconds to remove the oxide film on the surface. Ultrasonic cleaning of C / SiC composite material, molybdenum and Ti, Ni foil with ethanol, the cleaning time is 3min, after drying with cold wind, put the above-me...

Embodiment 3

[0025] Embodiment 3: the area to be welded is 900cm 2 Joining of C / SiC composites with GH140 Fe-based heat-resistant alloy.

[0026] refer to image 3 , Figure 5. Use sandpaper to polish the C / SiC composite material and GH140 iron-based heat-resistant alloy to be welded flat, and remove the oxide film on the surface of the GH140 iron-based heat-resistant alloy. The diamond slow-speed cutting machine and the special cutting blade process a sine wave structure on the surface of the C / SiC composite material to be connected. The arc groove width formed by this structure is a sine wave period: 1.2mm, the groove depth is 1.4mm, and the groove center distance : 1.2mm. Nb and Ni foils are selected as the middle layer with a total thickness of 0.6mm, and the weight percentage of Ni is 48%. Ultrasonic cleaning of C / SiC composite material, GH140 iron-based heat-resistant alloy, Nb, and Ni foil with ethanol for 3 minutes, and drying with cold air. Put the above parts into the vacuu...

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Abstract

This invention discloses connecting method of carbon/carbon, carbon/silicon carbide complex material with heat resistance alloy. Square wave, triangular wave or sine wave waveform are processed on C/SiC or C/C connecting surface. Deposit before welding or connecting heat process are used to melt mesosphere connecting material and fill the C/SiC or C/C waveform and connecting surface, and it penetrates C/SiC or C/C inside of the basal body to generate chemical linkage with C/SiC or C/C, so it can reach connecting function of mechanical articulation and combine with chemical linkage with heat resistance alloy. Joint interface geometry in this invention is changed from lank joint interface in existing technique into Square wave, triangular wave or sine wave waveform interface, in order to release joint heat stress and transfer stress concentration area from joint interface to inner part of C/SiC or C/C basal body, so bad affection of joint heat stress is weakened and joint cutting strength is improved. The cutting strength of the joint in this invention is improved from 25-30MPa in existing technique to 30-50MPa.

Description

technical field [0001] The invention relates to a method for connecting carbon / carbon, carbon / silicon carbide composite materials and heat-resistant alloys. Background technique [0002] The Chinese patent document "Application No. 200510096435.1" introduces a carbon / carbon composite material and titanium alloy welding method. The method adopts a composite functional intermediate layer design consisting of a core intermediate layer and an auxiliary intermediate layer. The core intermediate layer can penetrate into the C / C matrix through eutectic melting, and at the same time, the active metal in the core intermediate layer forms a chemical bond with the C / C surface, thereby achieving the connection function of combining mechanical interlocking and chemical reaction. By selecting the appropriate auxiliary intermediate layer material, the residual thermal stress of the joint after welding can be effectively relieved. Its composite functional middle layer can realize the dual ...

Claims

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Application Information

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IPC IPC(8): C04B37/02
Inventor 熊江涛李京龙张赋升成来飞李贺军
Owner NORTHWESTERN POLYTECHNICAL UNIV
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