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Method for brazed connection of C/C composite material through high-entropy alloy

A technology of composite materials and high-entropy alloys, applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve problems such as difficult wetting, poor high-temperature mechanical properties of joints, and large residual stress, so as to reduce residual stress and relieve residual stress. effects of stress, good wetting

Active Publication Date: 2021-07-30
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention provides a method for brazing C / C composite materials using high-entropy alloys. The purpose is to improve the current problems of difficult wetting, large residual stress, and poor high-temperature mechanical properties of joints used for brazing C / C composite materials, and to obtain Reliable C / C Composite Welded Joints

Method used

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  • Method for brazed connection of C/C composite material through high-entropy alloy
  • Method for brazed connection of C/C composite material through high-entropy alloy
  • Method for brazed connection of C/C composite material through high-entropy alloy

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Embodiment 1

[0029] Using AlCoCrFeNi 2.1 The method for high-entropy alloy brazing C / C composite material, the steps are as follows:

[0030] 1) Use 800#, 2000# SiC sandpaper to grind the surface of the C / C composite material to be brazed step by step, and place it on a polishing machine, polish it with a diamond suspension with a particle size of 1 μm until there is no trace, and then place it Ultrasonic cleaning in acetone, and finally drying to complete the surface treatment;

[0031] 2) According to AlCoCrFeNi 2.1 The atomic ratio of each metal raw material in the high-entropy alloy, the metal raw material powders are mixed together according to the ratio to form a powder raw material; the powder raw material is suspended and smelted at a temperature of 1350 ° C, and the powder raw material is smelted into a solder alloy ingot , and then repeated smelting 4 times to make a solder alloy ingot with uniform composition;

[0032] 3) Cut the solder alloy ingot obtained in step 2) into 0....

Embodiment 2

[0037] Using AlCoCrFeNi 2.1 The method of high-entropy alloy brazing C / C composite materials, the operation steps are repeated in Example 1, the only difference is that "in step 5), the brazing temperature is replaced from 1350°C to 1380°C", other conditions and examples 1 is the same, and the final preparation uses AlCoCrFeNi 2.1 Joints of C / C composites brazed with high-entropy alloys.

Embodiment 3

[0039] Using AlCoCrFeNi 2.1 The method of high-entropy alloy brazing C / C composite materials, the operation steps are repeated in Example 1, the only difference is that "in step 5), the brazing temperature is replaced from 1350°C to 1410°C", other conditions and examples 1 is the same, and the final preparation uses AlCoCrFeNi 2.1 Joints of C / C composites brazed with high-entropy alloys. The shape of the joint is as figure 2 shown.

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Abstract

The invention discloses a method for brazed connection of a C / C composite material through a high-entropy alloy. The method comprises the following steps that firstly, the C / C composite material is subjected to surface treatment, the high-entropy alloy AlCoCrFeNix is cut and ground until the thickness is 70 microns (+ / -10 microns), and a brazing filler metal foil is made; and the C / C composite material and the brazing filler metal foil are assembled and placed in a vacuum brazing furnace to be heated and activated, and then preparation is completed. According to the method, the adopted high-entropy alloy brazing filler metal has excellent wettability on the C / C composite material, and wetting is mainly achieved through the effect of Ni and the dissolution diffusion reaction; in the welding process, residual stress between a base material and a joint is fully relieved through formation of M7C3, increase of a BCC phase and formation of a composite structure layer, and the maximum strength of the joint can reach 21.93 MPa; and in addition, a high-entropy structure in a welding seam is reserved, the stability of high-temperature strength of the joint is ensured, and the method has important research prospects.

Description

technical field [0001] The invention relates to the field of brazing, in particular to a method for connecting C / C composite materials by using high-entropy alloy brazing. Background technique [0002] C / C composite material has excellent high temperature stability and corrosion resistance, and is the only structural material that can be used above 2500 °C. In addition, C / C composite materials have low density, high specific strength, high specific modulus, excellent heat transfer performance and wear resistance, and are widely used in aerospace and other industrial fields. Such as wing leading edge, turbine engine parts, aircraft front cover and brake pads, as well as precision wear-resistant parts such as bearings and sealing rings. In order to meet the service requirements under different working conditions, the self-connection of C / C composites is usually required to obtain C / C composites of different sizes and complex structures. At present, the solder used for the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/00B23K1/008B23K1/19B23K1/20B23K3/08
CPCB23K1/0008B23K1/19B23K1/20B23K1/008B23K1/206B23K3/08
Inventor 贺艳明徐海涛朱先帅张成胤杨建国周正强石磊刘玉章李华鑫闾川阳郑文建马英鹤
Owner ZHEJIANG UNIV OF TECH