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Method for in-situ generation of Ti7Al5Si12 reinforced brazing seam from foamed titanium

An in-situ generation, foamed titanium technology, applied in metal processing equipment, welding equipment, manufacturing tools, etc., can solve the problems of large residual stress, poor wettability, and large difference in thermal expansion coefficient, and achieve reduced residual stress and thermal expansion. The effect of reducing the coefficient and reducing the thermal expansion coefficient difference

Pending Publication Date: 2022-07-29
GUIZHOU INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a kind of foam titanium in-situ generation Ti 7 Al 5 Si 12 The brazing method of strengthening the brazing seam solves the problem of poor wettability of the brazing filler metal on the surface of the composite material and large residual stress caused by the large difference in thermal expansion coefficient between the brazing seam and the composite material

Method used

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  • Method for in-situ generation of Ti7Al5Si12 reinforced brazing seam from foamed titanium
  • Method for in-situ generation of Ti7Al5Si12 reinforced brazing seam from foamed titanium
  • Method for in-situ generation of Ti7Al5Si12 reinforced brazing seam from foamed titanium

Examples

Experimental program
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Effect test

Embodiment 1

[0049] A method for in-situ generation of Ti7Al5Si12 reinforced aluminum-based brazing seam from titanium foam, the specific steps are as follows:

[0050] Step 1, select aluminum-based solder, the main component of the solder is Al-Si alloy, and the shape is powder, paste, foil, strip or ring;

[0051] Step 2, carry out DSC test on the aluminum-based solder, and measure its liquidus as T;

[0052] Step 3, prepare the base metal, titanium foam and brazing material before welding;

[0053] Step 4, pre-weld assembly in a furnace;

[0054] Step 5, vacuumize, set the welding temperature and holding time, set or not set the pressure, and start welding;

[0055] Step 6, cooling with the furnace to complete the welding.

[0056] In step 1, preferably, the mass fraction of Si element in the aluminum-based solder is 8-20%, and the balance is Al and a small amount of other alloying elements.

[0057] In step 2, the liquidus temperature T ≥ 550°C obtained by the DSC test.

[0058] I...

Embodiment 2

[0076] A method for in-situ generation of Ti7Al5Si12 reinforced aluminum-based brazing seam from titanium foam, the specific steps are as follows:

[0077] Step 1, select aluminum-based solder, the main component of the solder is Al-Si alloy, and the shape is powder, paste, foil, strip or ring;

[0078] Step 2, carry out DSC test on the aluminum-based solder, and measure its liquidus as T;

[0079] Step 3, prepare the base metal, titanium foam and brazing material before welding;

[0080] Step 4, pre-weld assembly in a furnace;

[0081] Step 5, vacuumize, set the welding temperature and holding time, set or not set the pressure, and start welding;

[0082] Step 6, cooling with the furnace to complete the welding.

[0083] In step 1, preferably, the mass fraction of Si element in the aluminum-based solder is 12-14%, and the balance is Al and a small amount of other alloying elements.

[0084] In step 2, the liquidus temperature T ≥ 550°C obtained by the DSC test.

[0085] ...

Embodiment 3

[0101] Example 3. Prepare Al-Si10.5-Mg0.1 powder solder, according to figure 1 Assembly drawing shown for 70% SiC p / Al composite material sample, AlSiMg solder and foamed titanium were assembled, the welding temperature was 700 °C, the holding time was 1 h, and the welding pressure was 10 MPa.

[0102] Specific steps: use Al, Si, Mg pure metal powder, prepare brazing filler metal according to the ratio of Al-Si10.5-Mg0.1, and prepare brazing filler metal after stirring, ball milling and drying; cut the foamed titanium into small pieces, The surface of the composite material to be welded is ground with a water mill, and then the surface of the sample to be welded that has been roughly ground is finely ground with 280, 400 and 600 sandpapers in turn. The samples were ultrasonically cleaned with absolute ethanol, and then dried in cold air for use; press figure 1 Fill the prepared powder brazing filler metal and foam titanium between the surfaces of the samples to be welded, ...

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Abstract

The invention relates to a method for generating a Ti7Al5Si12 reinforced aluminum-based brazing seam in situ by using foamed titanium, which comprises the following steps of: heating foamed titanium and brazing filler metal mainly comprising Al and Si elements in a vacuum furnace to be not lower than 550 DEG C, keeping the temperature, applying or not applying pressure, and performing wetting, diffusion and reaction on the surface of a base metal and in pores of the foamed titanium by using liquid aluminum brazing filler metal to form the Ti7Al5Si12 reinforced aluminum-based brazing seam. And enabling the surface of the foam titanium to react to generate a Ti7Al5Si12 compound, and reinforcing the brazing seam in situ. Brazing seam metallurgical bonding is promoted, the brazing seam thermal expansion coefficient is reduced, the joint residual stress is reduced, and the joint mechanical property is improved.

Description

technical field [0001] The invention relates to a foamed titanium in-situ generation of Ti 7 Al 5 Si 12 A method for strengthening brazing seam belongs to the technical field of welding. Background technique [0002] High volume fraction SiC p Due to its excellent properties such as high strength, high wear resistance, high thermal stability, high elastic modulus, low density and low thermal expansion coefficient, / Al composites have great potential in aerospace precision instruments, weapon defense and other fields. High volume fraction SiC p The high volume fraction of SiC particles in the / Al composite material has high hardness and poor electrical conductivity, so its connection is very difficult, and the application of arc welding and friction stir welding in its welding is severely restricted. Volume Fraction SiC p / Al composite bonding method. [0003] High volume fraction SiC p When brazing / Al composites, due to the high content of SiC ceramics, there are of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/008B23K1/14
CPCB23K1/008B23K1/14
Inventor 李娟秦庆东赵宏龙罗少敏常子恒李玉松张英哲尚胜艳
Owner GUIZHOU INST OF TECH
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