Pulse electric field and ultrasonic field assisted metal matrix composite sintering synchronous joining method and device

A pulsed electric field, composite material technology, applied in metal processing equipment, charge, electric furnace heating, etc., can solve the problems of oxide film blockage on the surface of materials, high difficulty of interfacial atom diffusion, and large physical and chemical differences of heterogeneous materials, etc., to increase the number of and uniform distribution, ensure the quality of sintering and connection, and improve the effect of growth rate

Active Publication Date: 2020-07-31
李纲
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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem of large physical and chemical differences of heterogeneous materials, stagnation of oxide film on the surface of materials, high difficulty of interfacial atom diffusion, difficult metallurgical reaction, and joint failure during the sintering of the reinforcing phase and the metal matrix and the connection process of the sintered body and the alloy. To solve the problems of low connection strength and unstable quality, a pulse current-ultrasonic compound-assisted sintering and connection synchronization method and device are provided. The invention also integrates the secondary dieless sintering of composite materials and the connection of different materials to solve the problems of low efficiency, Defects with high equipment requirements

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  • Pulse electric field and ultrasonic field assisted metal matrix composite sintering synchronous joining method and device
  • Pulse electric field and ultrasonic field assisted metal matrix composite sintering synchronous joining method and device
  • Pulse electric field and ultrasonic field assisted metal matrix composite sintering synchronous joining method and device

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preparation example Construction

[0047] A. Preparation of experimental materials:

[0048] Material: Micron-level magnesium alloy or copper alloy powder is selected as the matrix material, and the micron-level (≤20μm) reinforcement phase (such as SiC ceramic particles) is used. Firstly, a certain proportion of the reinforcement phase particles and the matrix material are subjected to high-energy ball milling by high-energy ball milling. The rotation speed of the ball mill is 1200~1500rpm, the ball milling time is 6~10h, the reinforcement and the base material are mixed evenly, the mixed powder is sintered in a vacuum sintering furnace, and the pre-sintered block is prepared under a pressure of 2~3MPa. The intermediate layer alloy is formed into a thin sheet.

[0049] Use a diamond grinding disc to polish the surface of the pre-sintered block and the alloy to be welded flat and smooth, and then polish it with a 0.5 μm diamond polishing machine until the interface is bright and smooth, and clean the surface of ...

Embodiment 1

[0060] Pulsed current-ultrasonic composite assisted sintering of SiC magnesium matrix composites and simultaneous diffusion bonding of 316L stainless steel plates.

[0061] 1. Preparation of experimental materials

[0062] a. The base material to be welded is high volume fraction SiC magnesium-based powder pre-sintered billet and 316L stainless steel plate, cut into a cuboid of 8×15×30mm, and processed into a stepped lap structure, and polished with 800#~1200# sandpaper The surface of the base metal to be welded is ultrasonically cleaned in acetone and dried for later use. The pre-sintered billet is sintered synchronously during the diffusion welding process, in which the volume fraction of SiC reinforcement phase is 10%~50%, the average diameter of SiC powder is 100nm, and the metal matrix is ​​AZ61 magnesium alloy powder;

[0063] b. Cut the middle layer Ag-21Cu-4.5Ti (Ag content 74.5%, Cu content 21%, Ti content 4.5%) alloy into 8×8×0.3mm thin slices, ultrasonic cleaning i...

Embodiment 2

[0073] Pulsed current-ultrasonic composite assisted sintering of B4C copper matrix composites with simultaneous diffusion bonding of Ti-6Al-4V alloys.

[0074] 1. Preparation of experimental materials

[0075] a. The base metal to be welded has a high volume fraction B 4 C copper-based powder pre-sintered compact and Ti-6Al-4V (Ti content 90%, Al content 6%, V content 4%) alloy plate, cut into 8 × 15 × 30mm cuboid, and use 800 # ~1200 # Grind the surface of the base metal to be welded with sandpaper, ultrasonically clean it in acetone, and dry it for later use. The pre-sintered body is sintered synchronously during the diffusion welding process, where B 4 The volume fraction of C reinforcement phase is 10%~50%, B 4 The average diameter of the C powder is 100nm, and the Cu powder is an aerosolized spherical powder;

[0076] b. Cut the Al-12Si (88% Al content, 12% Si content) amorphous alloy in the middle layer into thin slices of 8×8×0.3 mm, ultrasonically clean them in ac...

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Abstract

The invention relates to a method and device for sintering synchronous connection of metal matrix composite materials assisted by pulsed electric field and ultrasonic field, and discloses a method for connecting a magnesium (or copper) matrix composite material containing a high volume fraction reinforcing phase to stainless steel while sintering. The devices involved in this method include: a closed heating furnace, a pulse current loading system, an ultrasonic load applying system, a pressure and lifting system, and auxiliary devices such as sealed insulating tubes. The significant advantage of adopting the present invention is that the sintering of the metal matrix composite material and the connection of different materials are carried out simultaneously; the pulse current flows through the experimental material, causing interface resistance heat and plasma discharge heat, and the sintering and connection interface temperature rises and cools quickly, reducing external radiation heat, reduce the residual stress of the joint; use the coupling effect of pulsed electric field-ultrasonic field-pressure field to break the oxide film on the surface of the reinforcement phase, realize sintering under atmospheric conditions, reduce the activation energy of atomic diffusion, promote the interface metallurgical reaction, and control the particle shape and size , refine the interface grains, improve the quality and stability of the joint, and is conducive to the preparation of metal matrix composites / alloy joints with high comprehensive performance.

Description

technical field [0001] The invention relates to a synchronous connection method for metal matrix composite material / alloy sintering assisted by pulse current and ultrasonic composite, specifically a magnesium (or copper) matrix composite material containing a reinforcing phase based on pulse current and ultrasonic composite technology for sintering, and simultaneously realizes A new way of joining the material with heterogeneous alloys. Background technique [0002] With the rapid development of science and technology, it is becoming increasingly difficult for single-attribute materials to meet the needs of high-end equipment and manufacturing industries. more stringent requirements. Metal matrix composite material is a heterogeneous composite material composed of metal and ceramics, whiskers or carbon nanotube particles and other reinforcing phases. It embodies the characteristics of metal and has ultra-high strength. It is an important structural material and material in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P23/00B22F3/00B22F3/10B23K20/02B23K20/26F27B17/02F27D11/10F27D11/12
CPCF27B17/02F27D11/10F27D11/12B23K20/026B23K20/26F27M2003/04
Inventor 张鹏董鹏寇子明王文先崔功军
Owner 李纲
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