Method for connecting high-entropy ceramic and metal

A connection method, high-entropy alloy technology, applied in the field of welding, can solve the problems of reduced joint strength, difficult compatibility, and large residual stress

Active Publication Date: 2022-01-25
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] High-entropy ceramics (HECs) and metals due to the apparent differences in chemical bonding, chemical composition, and physical properties such as melting point, thermal expansion coefficient, thermal conductivity, and specific heat capacity, When the two are welded, there are two key problems of base metal wetting, compatibility difficulties and excessive residual stress, which seriously reduce the strength of the joint

Method used

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  • Method for connecting high-entropy ceramic and metal
  • Method for connecting high-entropy ceramic and metal

Examples

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Embodiment 1

[0060] A welding method for high-entropy ceramics and metals, comprising the steps of:

[0061] (1), adopt wire cutting to process (TaZrNbHfTi)C high-entropy ceramics into a diameter φ 15mm, a cylindrical sample with a height of 6mm, and use 600#, 800#, 1200#, 2000# diamond grinding discs to polish the surface to be welded successively, Then place it in a vibrating polishing machine, use aluminum oxide and silica gel solutions for rough polishing and fine polishing respectively until there are no scratches on the surface, then clean with alcohol under the action of ultrasonic waves, and finally dry it;

[0062] (2) To prepare TaZrNbHfTi refractory high-entropy alloy, according to the atomic ratio of each element of TaZrNbHfTi refractory high-entropy alloy 1:1:1:1:1, the metal raw material particles (purity > 99.9%) are proportioned and weighed; then Put the raw material into the electric arc melting furnace, and under the protection of high-purity argon, melt it repeatedly at ...

Embodiment 2

[0071] A high-entropy ceramic and metal welding method in this embodiment, the experimental steps are repeated in Example 1, the only difference is that "in step 5, the diffusion welding temperature is adjusted from 1650 ° C to 1700 ° C", other conditions and examples 1, a structure in which (TaZrNbHfTi)C high-entropy ceramics and Ti2AlNb alloys are connected by vacuum diffusion welding is finally obtained with TaZrNbHfTi refractory high-entropy alloy as the intermediate layer.

[0072] see figure 2 , is the interfacial micrograph of the connection between (TaZrNbHfTi)C high-entropy ceramics and Ti2AlNb alloy using TaZrNbHfTi refractory high-entropy alloy as the intermediate layer in Example 2, and adopting vacuum diffusion welding. Depend on figure 2 It can be seen that there are no obvious defects such as cracks and holes in the weak part of the welded joint, that is, the welding interface of (TaZrNbHfTi)C high-entropy ceramics and TaZrNbHfTi refractory high-entropy alloy...

Embodiment 3

[0074] A welding method for high-entropy ceramics and metals in this embodiment, the experimental steps are repeated in Example 1, the difference is only in "in step 5, the diffusion welding temperature is adjusted from 1650°C to 1750°C", other conditions and examples 1, a structure in which (TaZrNbHfTi)C high-entropy ceramics and Ti2AlNb alloys are connected by vacuum diffusion welding is finally obtained with TaZrNbHfTi refractory high-entropy alloy as the intermediate layer.

[0075] see image 3 , is adopting TaZrNbHfTi refractory high-entropy alloy as intermediate layer in embodiment 3, adopts vacuum diffusion welding to realize (TaZrNbHfTi)C high-entropy ceramics and Ti2AlNb alloy interfacial micrographs connected, by image 3It can be seen that there are no obvious defects such as cracks and holes in the weak part of the welded joint, that is, the welding interface of (TaZrNbHfTi)C high-entropy ceramics and TaZrNbHfTi refractory high-entropy alloy, and the microstructur...

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Abstract

The invention provides a method for connecting a high-entropy ceramic and a metal. The method comprises the following steps: S1, carrying out vacuum diffusion welding on a high-entropy ceramic and TaZrNbHfTi refractory high-entropy alloy at a high temperature to obtain a welding assembly; and S2, carrying out vacuum diffusion welding on the TaZrNbHfTi refractory high-entropy alloy of the welding assembly and a metal to complete the connection of the high-entropy ceramic and the metal. According to the connecting method for the high-entropy ceramic and the metal, the TaZrNbHfTi refractory high-entropy alloy serves as the middle layer, so that diffusion welding of the high-entropy ceramic and the metal is achieved, good wetting of base metal and smooth transition of the thermal expansion coefficient can be achieved, and generation of defects such as cracks is restrained so as to improve the strength of a joint.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a method for connecting high-entropy ceramics and metals. Background technique [0002] High-entropy alloy (HEA), also known as multi-principal alloy, each principal element is mixed with an equiatomic ratio or a near-equal atomic ratio, and the atomic fraction of the principal element is between 5% and 35%. High-entropy alloys have high-entropy effects, hysteretic diffusion effects, lattice distortion effects, and cocktail effects, which have attracted widespread attention from scholars at home and abroad. High-entropy ceramics are a class of high-entropy materials extended from the compositional design concept of high-entropy alloys. Compared with high-entropy alloys, high-entropy ceramics' structural diversity and electronic structure adjustability provide a better way for their performance regulation and application. a wider space. High-entropy ceramics usually include car...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B37/02
CPCC04B37/003C04B37/023C04B2235/96C04B2235/77C04B2237/122C04B2237/52
Inventor 吴正刚李忠涛汪俊杰张卫东
Owner HUNAN UNIV
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