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Soldering method of composite foil for carbon/silicon carbide and niobium or niobium alloy

A technology of silicon carbide and composite foil, applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve the problems of low joint shear strength, joint failure, complicated process, etc., and achieve high production efficiency and high shear strength , The effect of simple process

Inactive Publication Date: 2008-08-13
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing connection method is only applicable to the connection of carbon / silicon carbide composite body, and there are problems such as complex process, low shear strength of the joint, and the connection of the joint cannot be applied at a temperature above 500°C , and provide a method for brazing carbon / silicon carbide and niobium or niobium alloy composite foil

Method used

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Examples

Experimental program
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Effect test

specific Embodiment approach 1

[0007] Specific embodiment one: the method for carbon / silicon carbide and niobium or niobium alloy composite foil brazing in this embodiment is implemented according to the following steps: 1. For Ti foil, Ni foil, carbon / silicon carbide composite material and niobium or niobium alloy The surface of the niobium alloy is cleaned; 2. Ti foils and Ni foils are alternately stacked to form a composite foil of 2n layers of foil, and then sandwiched according to the structure of carbon / silicon carbide composite materials, composite foils, and niobium or niobium alloys. The Ti foil at one end of the composite foil is in contact with niobium or niobium alloy, and the Ni foil at the other end of the composite foil is in contact with the carbon / silicon carbide composite material; 3. Place the clamped weldment in a vacuum furnace at a temperature of 0.001 to 0.1 MPa pressure fixes the weldment, and then in a vacuum of 1×10 -3 ~6×10 -3 Under the vacuum condition of Pa, heat up to 1100-130...

specific Embodiment approach 2

[0010] Specific embodiment two: The difference between this embodiment and specific embodiment one is that in step one, the surface of Ti foil, Ni foil, carbon / silicon carbide composite material and niobium or niobium alloy is cleaned using 600 # Sand it smooth, then ultrasonically clean it in an acetone solution, and let it dry. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0011] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the thickness of the composite foil in Step 2 is 150-400 μm. Other steps and parameters are the same as those in Embodiment 1.

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Abstract

The invention relates to a composite foil braze welding method for carbon / silicon carbide and niobium or niobium alloy, relating to braze welding method for carbon / silicon carbide and niobium or niobium alloy. The invention resolves problems in prior art that the connection method is only adapted to connection between carbon / silicon carbide materials, the technique is complicated, the anti-shearing strength is low, and joint thereof can't bear a temperature above 500 DEG C. The invented method comprises following steps: (1) cleaning solder surface; (2) claming the weldment; (3) braze welding the clamped weldment, then lowering the temperature, and completing braze welding. The invented method is provided with a simple technique process, the anti-shearing strength of the joint is high, which is 70-120 MPa at temperature ranging from room temperature to 600 DEG C, and up to 50-70 MPa at 800 DEG C, thereby the invented technique is adapted to be used in high-temperature technology field.

Description

technical field [0001] The present invention relates to a method of brazing carbon / silicon carbide to niobium or niobium alloys. Background technique [0002] Carbon / silicon carbide composite material is a new type of ultra-high temperature structural material, which has broad application prospects in aerospace, weaponry and other fields. [0003] In the patent titled "Transient liquid phase diffusion welding method of carbon / silicon carbide composite materials (Chinese patent number: ZL200510096313.2, application date: November 08, 2005)", the connection method used is only applicable to carbon / silicon carbide composite materials The connection of the material body, and the process is complicated; due to the large difference in thermophysical properties between the carbon / silicon carbide composite material and the metal, there is a high residual stress in the joint after the connection, so the connection between the carbon / silicon carbide composite material and the metal is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/16B23K20/02B23K20/24
Inventor 张丽霞刘玉章冯吉才
Owner HARBIN INST OF TECH