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Synchronous bonding method for metal matrix composite material sintering assisted by pulsed electric field and ultrasonic field and device thereof

A technology of pulsed electric field and composite materials, which is applied in the direction of metal processing equipment, furnace charge, electric furnace heating, etc., can solve the problems of material surface oxide film retardation, large physical and chemical differences of heterogeneous materials, and high difficulty of interfacial atom diffusion, so as to increase the quantity and The degree of uniformity, the effect of increasing the growth rate and ensuring the quality of sintering and connection

Active Publication Date: 2018-11-27
李纲
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  • Claims
  • Application Information

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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

Method used

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  • Synchronous bonding method for metal matrix composite material sintering assisted by pulsed electric field and ultrasonic field and device thereof
  • Synchronous bonding method for metal matrix composite material sintering assisted by pulsed electric field and ultrasonic field and device thereof
  • Synchronous bonding method for metal matrix composite material sintering assisted by pulsed electric field and ultrasonic field and device thereof

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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 provides a synchronous bonding method for metal matrix composite material sintering assisted by pulsed electric field and an ultrasonic field and a device thereof. The invention discloses a method for connecting magnesium (or copper) matrix composite material with stainless steel while sintering, which is assisted by pulsed electric field and ultrasonic field, and a device for simultaneously sintering metal matrix composite material. The device of the method comprises an airtight heating furnace, a pulse current loading system, an ultrasonic load applying system, a pressure and lifting system, a sealed insulating pipe and other auxiliary devices. The remarkable advantage of the invention is that the sintering of the metal matrix composite material and the joining of the different materials are carried out simultaneously; Pulse current flowing through the experimental material induces interface resistance heat plasma spark heat sintering and bonding interface heating and cooling speed fast reducing external radiant heat reducing residual stress of the joint. Using the coupling function of pulsed electric field- ultrasonic field-pressure field, breaking the oxide film on the surface of reinforcing phase, sintering under atmospheric conditions, reducing the activation energy of atomic diffusion, promoting the interfacial metallurgical reaction, controlling the particle morphology and size, refining the interfacial grains and improving the quality stability of joints are conducive to the preparation of metal matrix composite / alloy joints with high comprehensive properties.

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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IPC IPC(8): B23K20/02B23K20/26F27B17/02F27D11/10F27D11/12B22F3/00
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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