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High-temperature brazing filler metal

A technology of high-temperature solder and mass percentage, which is applied in the direction of welding/cutting medium/material, welding medium, casting melt container, etc., and can solve the problem of low shear strength of joints

Active Publication Date: 2010-02-24
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to solve the problem of low shear strength of the joint obtained by using the existing brazing filler metal to braze composite materials, and to provide a high-temperature brazing filler metal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0007] Embodiment 1: In this embodiment, the high-temperature solder is composed of 20% to 60% Ti, 30% to 70% Ni and the rest of Nb by mass percentage; wherein the purity of Ti is ≥99.0% (mass), and the purity of Ni is ≥99.0% (mass), Nb pure ≥99.0% (mass).

[0008] The preparation method of the high-temperature solder in the present embodiment is as follows: 1. Add a mixture of 20% to 60% Ti, 30% to 70% Ni and the rest of Nb by mass percentage into the graphite crucible, and then heat the 1400℃, vacuum degree is 1×10 -3 Pa~5×10 -3 Under the condition of Pa, vacuum melt the mixture for 10min to 120min to obtain alloy ingots; or in argon pressure of 0.04MPa to 0.08MPa and melting current density of 150A / cm 2 ~250A / cm 2 Under certain conditions, the mixture is arc-melted in a water-cooled copper crucible, and then remelted 0 to 5 times to obtain an alloy ingot; 2. The alloy ingot is cut into foils with a thickness of 0.01mm to 2mm by a wire-cut electric discharge machine , an...

specific Embodiment approach 2

[0013] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the high-temperature brazing filler metal is composed of 25%-55% Ti, 35%-65% Ni and the balance of Nb in mass percentage. Others are the same as in the first embodiment.

[0014] After testing, the room temperature shear strength of the obtained welded joint is 95 MPa-170 MPa when the high-temperature solder obtained in this embodiment is used for brazing.

specific Embodiment approach 3

[0015] Embodiment 3: This embodiment differs from Embodiment 1 in that the high-temperature brazing filler metal consists of 30%-50% Ti, 40%-60% Ni and the balance of Nb in mass percentage. Others are the same as in the first embodiment.

[0016] After testing, using the high-temperature solder obtained in this embodiment for brazing, the room temperature shear strength of the obtained welded joint is 92MPa-173MPa.

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Abstract

The invention discloses a high-temperature brazing filler metal, relating to a brazing filler metal. The invention solves the problem that joints obtained by using the prior brazing filler composite material have low shearing strength. The brazing filler metal comprises Ti or TiH2, Ni and Nb. When the high-temperature brazing filler material is used to braze C / SiC composite material and the brazing joint of the C / SiC composite material, room temperature three-point bending strength reaches 50MPa-71MPa, and the room temperature shearing strength of the brazing joint of the C / SiC composite material and metal reaches 90MPa-180MPa, moreover, the retention rate of the 800 DEG C high-temperature shearing strength of the brazing joint is more than 69% and the retention rate of the 800 DEG C high-temperature shearing strength is more than 42%. When the high-temperature brazing filler material is used to braze black lead and the joint of Nb, the room temperature shearing strength reaches 30MPa-60MPa.

Description

technical field [0001] The invention relates to a solder. Background technique [0002] The chemical activity of the composite material is low, and it is difficult for the conventional solder to wet its surface. The existing method uses Ag-Cu-Ti active solder to carry out active brazing of the C / SiC composite material and the Ti alloy, and the obtained C / SiC after brazing The room temperature shear strength of the joint between SiC composite material and Ti alloy is 84MPa~160MPa, and the shear strength of the joint at 500°C is 51MPa~104MPa. The use temperature of the joint obtained by this method is below 500°C, and the Ag-Cu-Ti active solder The use temperature of the material is 400℃~500℃. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a high-temperature solder to solve the problem of low shear strength of joints obtained by brazing composite materials using the existing solder. [0004] The high-temperature...

Claims

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Application Information

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IPC IPC(8): B23K35/32B23K35/30B23K35/40C22C1/02B22D11/06B22D41/58B23K1/008
Inventor 冯吉才刘玉章张丽霞刘承勃
Owner HARBIN INST OF TECH
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