Brazing method for ZrB2-based material

A connection method and base material technology, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problem of low strength of brazed joints, achieve the improvement of joint shear strength, relieve joint stress, and increase strength Effect

Active Publication Date: 2012-05-02
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the invention is in order to solve existing ZrB 2 The problem of low strength of the brazing

Method used

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  • Brazing method for ZrB2-based material
  • Brazing method for ZrB2-based material
  • Brazing method for ZrB2-based material

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Experimental program
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specific Embodiment approach 1

[0018] Specific implementation mode one: ZrB described in this implementation mode 2 The brazing connection method of the base material is carried out in the following steps: 1. Weigh 10wt.% to 50wt.% of Ti powder and 50wt.% to 90wt.% of Ag-Cu eutectic powder by mass percentage, and put them into a ball mill jar , under the protection of Ar gas, ball milling at a speed of 300r / min to 350r / min for 1h to 5h to obtain a composite solder; 2. ZrB 2 After the base material and the connecting parts to be connected with it are polished, they are ultrasonically cleaned with acetone for 5 minutes to 10 minutes, and then dried for use; 3. The composite solder and binder obtained in step 1 are processed according to the volume ratio of 1:0.5~2 After stirring and mixing, apply evenly on ZrB 2 The base material and the surface of the connector to be connected with it are the parts to be welded; 4. The parts to be welded obtained in step 3 are placed in a vacuum brazing furnace, and the vac...

specific Embodiment approach 2

[0020] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 1, 15wt.% to 40wt.% of Ti powder and 60wt.% to 85wt.% of Ag-Cu eutectic powder are weighed according to mass percentage . Others are the same as in the first embodiment.

[0021]The preferred embodiment of this embodiment is to weigh 15wt.% Ti powder and 85wt.% Ag-Cu eutectic powder according to mass percentage.

specific Embodiment approach 3

[0022] Specific implementation mode three: ZrB described in this implementation mode 2 The brazing connection method of the base material can also be carried out according to the following steps: 1. Ti foil and Ag-Cu eutectic foil are stacked with a thickness ratio of 0.21 to 1.12:1, which is brazing foil; 2. ZrB 2 After the base material and the connectors to be connected with it and the solder foil prepared in step 1 are polished, they are ultrasonically cleaned with acetone for 5 to 10 minutes, then dried, and then the ZrB 2 The base material, brazing material foil and connectors are superimposed to form the workpiece to be welded; 3. Place the workpiece to be welded obtained in step 2 in a vacuum brazing furnace, and vacuum the vacuum brazing furnace to 5×10 -4 ~1×10 -3 Pa, then raise the temperature of the vacuum brazing furnace to 750°C at a speed of 15°C / min, and keep it for 5 minutes, then raise the temperature at a speed of 10°C / min to 840°C~980°C, keep it for 5~20mi...

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Abstract

A method for improving brazing connection strength of a ZrB2-based material relates to a brazing connecting method. The invention solves the problem that the brazing joint prepared by the method of active brazing filler metal with ZrB2-based material is low in strength, the remaining stress is large and reliability is not high caused by mismatching of thermal expansion coefficients of ceramic and metal. The brazing connecting method provided by the invention comprises the steps of: coating the composite brazing filler metal consisting of Ti powder and Ag-Cu eutecticpowder on the ZrB2-based material and connecting pieces which are to be connected on the ZrB2-based material; or placing the brazing filler metal foil consisting of Ti foil and Ag-Cu eutectic foil onthe ZrB2-based material and between the connecting pieces which are to be connected on the ZrB2-based material to form a piece to weld; placing the piece to a vacuum brazing furnace to weld so as to braze the ZrB2-based material. The method relieves the joint stress and improves the strength of the joint effectively. The shear strength of the brazing joint obtained by the method is 93.8MPa-112.3MPa and the strength of the joint is improved by 57-89%. The invention can be used to the field of brazing connection.

Description

technical field [0001] The present invention relates to a soldering connection method. Background technique [0002] Zirconium diboride (ZrB 2 ) ceramics are an important class of ultra-high temperature ceramics (UHTCs). ZrB 2 Made ZrB for the matrix 2 Matrix composite materials have excellent high temperature chemical stability, high electrical conductivity, high thermal conductivity and strong ablation resistance, and can be widely used in extreme chemical and thermal environments, such as hypersonic aircraft, rocket nozzles, space shuttles Skinning etc. Due to ZrB 2 base ceramics and ZrB 2 The processing performance of matrix composite materials is poor, and it is difficult to manufacture large-sized and complex-shaped parts. Generally, ZrB 2 based ceramics or ZrB 2 Parts made of matrix composite materials can be welded with other material parts, such as welding with titanium alloy and niobium alloy parts, or with ZrB 2 Ceramic or ZrB 2 Welding of base composite...

Claims

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Application Information

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IPC IPC(8): B23K1/19B23K1/008B23K35/34
Inventor 林铁松何鹏杨卫岐
Owner HARBIN INST OF TECH
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