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Dispersion-strengthened ultra-fine grain silver-based metal oxide composite material and preparation method thereof

A composite material and dispersion strengthening technology, applied in contacts, electrical components, circuits, etc., can solve the problem of less attention to the grain size of the silver matrix, so as to avoid the growth of dynamic recrystallization grains and eliminate recompression , The effect of saving production costs

Active Publication Date: 2022-04-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the preparation process of the existing Ag-MeO electrical contact materials, the type, shape, size and distribution of the metal oxide on the silver matrix are usually the main focus, while relatively less attention is paid to the grain size of the silver matrix

Method used

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  • Dispersion-strengthened ultra-fine grain silver-based metal oxide composite material and preparation method thereof
  • Dispersion-strengthened ultra-fine grain silver-based metal oxide composite material and preparation method thereof
  • Dispersion-strengthened ultra-fine grain silver-based metal oxide composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Get 880 grams of Ag ingots, 103 grams of Sn ingots, 4 grams of Cu ingots, and 13 grams of Bi ingots. After melting in an intermediate frequency induction furnace, adopt high-pressure gas atomization to prepare Ag-Me alloy powders. Get 100 grams of Ag-Me alloy powders and 42 g solid Ag 2 O mixed evenly and molded into a green body with a diameter of 28mm. The green body was sintered in three stages in the muffle furnace for in-situ reaction synthesis and sintering. The temperature is 300°C, and the time is 4h; the high temperature insulation sintering temperature is 910°C, and the time is 2h; then the in-situ reaction synthesis sintered billet heated to 920°C is put into the extrusion mold that has been preheated to 450°C for hot extrusion Pressure (extrusion ratio is 49) and immersion online quenching (extrusion material temperature (referring to the initial temperature of the extrusion material when in contact with the medium, the same below) is: 880°C, the medium is w...

Embodiment 2

[0051] Take 850 grams of Ag ingots, 120 grams of Zn ingots, 10 grams of Al ingots, 10 grams of Mo ingots, and 10 grams of Ce ingots. After melting in an intermediate frequency induction furnace, adopt high-pressure gas atomization to prepare Ag-Me alloy powder. Take 100 grams of Ag ingots. -Me alloy powder with 53 grams of solid Ag 2 O mixed evenly and molded into a green body with a diameter of 28mm. The green body was sintered in three stages in the muffle furnace for in-situ reaction synthesis and sintering. 500°C for 3 hours; high temperature insulation sintering temperature of 850°C for 4 hours; then put the sintered billet heated to 860°C into an extrusion die preheated to 400°C for hot extrusion (extrusion ratio 12.3) and immersion online quenching (extrusion material temperature: 830°C, medium is quenching oil, oil temperature is 10°C, quenching time is 60min) to obtain a product with a diameter of 8mm.

Embodiment 3

[0053] Take 800 grams of Ag ingots, 180 grams of Cu ingots, 5 grams of La ingots, 10 grams of Ti ingots, and 5 grams of Mg ingots. After melting in an intermediate frequency induction furnace, adopt high-pressure gas atomization method to prepare Ag-Me alloy powder. Take 100 grams of Ag ingots. -Me alloy powder with 46 grams of solid Ag 2 O mixed evenly and molded into a green body with a diameter of 28mm. The green body was sintered in three stages in the muffle furnace for in-situ reaction synthesis and sintering. 450°C for 3 hours; high temperature insulation and sintering at 650°C for 4 hours; then put the sintered billet heated to 650°C into an extrusion die preheated to 350°C for hot extrusion (extrusion ratio of 196) and spray-type on-line quenching (extrusion material temperature: 600 ° C, the medium is an emulsion of water and quenching oil, the temperature is 10 ° C, and the quenching time is 5 min) to obtain a product with a diameter of 2 mm.

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Abstract

The invention discloses a preparation method of a dispersion-strengthened ultra-fine grain silver-based-metal oxide composite material, which comprises the following steps: firstly, preparing fine grain Ag-Me alloy powder by using a high-pressure gas spraying method, and then preparing a fine grain silver-metal oxide blank by using an in-situ reaction synthesis technology; and then the blank is prepared into the dispersion-strengthened ultra-fine grain silver-metal oxide material through a hot extrusion online quenching technology. According to the silver-metal oxide material prepared through the method, a silver matrix has an ultra-fine grain structure, oxide particles of the silver-metal oxide material are in-situ authigenic and are dispersed and distributed on the silver matrix, and the structure is uniform; the material integrates grain refinement and dispersion strengthening, has excellent fusion welding resistance, good arc erosion resistance and low and stable contact resistance, is easy to weld, has no harm to a human body and the environment, is suitable for industrial production, and can replace a toxic silver-cadmium oxide electrical contact.

Description

technical field [0001] The invention belongs to the field of electrical functional materials, and relates to a silver-metal oxide (Ag-MeO) electrical contact material, in particular to a dispersion-strengthened ultrafine-grain silver-based-metal oxide composite material and a preparation method thereof. [0002] technical background [0003] Contact material is a key contact element in electrical and electronic products, various industrial and domestic electric appliances, and an important guarantee for the efficient and stable operation of smart equipment and smart products in various power environments. Its performance is directly related to the overall equipment On-off capacity, service life and operational reliability. Silver cadmium oxide (Ag / CdO) contact material, which enjoys the reputation of "universal contact" in the industry, has been proven to be extremely harmful to human health and the natural environment, and its use has attracted worldwide attention. The inte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C5/06C22C32/00H01H1/0237H01H11/04
Inventor 吴春萍徐国富
Owner CENT SOUTH UNIV
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