Method for preparing silver tin oxide contact materials by high pressure oxidation of alloy powder ingots

A technology of silver tin oxide and contact materials, which is applied in the direction of cable/conductor manufacturing, electrical components, circuits, etc., can solve the problems of unstable electrical performance, affecting electrical life, and poor oxide areas, so as to ensure uniformity of structure, Effects of improving processability and improving sintering strength

Inactive Publication Date: 2015-01-07
GUILIN ELECTRICAL EQUIP SCI RES INST +1
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Existing studies have shown that silver tin oxide material is the most promising environmental protection contact material to replace silver cadmium oxide, but the two problems of poor processing performance and unstable electrical performance of silver tin oxide material have not been effectively solved, which restricts Popularization and Application of Silver Tin Oxide Material
[0003] At present, the process methods for preparing silver tin oxide materials in the industry include powder metallurgy method, chemical method and internal oxidation method. The internal oxidation method can be subdivided into alloy internal oxidation method and alloy powder pre-oxidation method. Among them, the alloy internal oxidation method refers to Melting Ag, Sn, and additives to form an alloy is prepared into alloy wire or plate, and then prepared into AgSnO with additives by internal oxidation process. 2 Contact materials, such as the technical solution disclosed by the publication number CN102820153A, but this type of process is prone to "poor oxide regions", which seriously affects its electrical life
The alloy powder pre-oxidation method mainly refers to the preparation of AgSn alloy powder containing additives into AgSnO alloy containing additives through powder oxidation process. 2 materials, and finally prepared into high-density AgSnO by extrusion or molding 2 Contact materials, such as the technical scheme disclosed by the publication number CN103184384A, but this type of process is prone to the phenomenon of oxide boundary enrichment, thus affecting the processing performance and electrical properties of the obtained contact material

Method used

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  • Method for preparing silver tin oxide contact materials by high pressure oxidation of alloy powder ingots
  • Method for preparing silver tin oxide contact materials by high pressure oxidation of alloy powder ingots
  • Method for preparing silver tin oxide contact materials by high pressure oxidation of alloy powder ingots

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) Weigh 17.6kg of pure silver block, 1.80kg of pure tin block, 0.048kg of pure copper block and 0.050kg of pure indium block, put them into an intermediate frequency furnace for melting (melting temperature is 1250°C), and then pass through high-pressure water atomization equipment Carrying out atomization, drying the obtained powder slurry, and passing through a 200-mesh sieve to obtain silver-tin alloy powder;

[0022] 2) The obtained silver-tin alloy powder is placed in an isostatic press to make a cylindrical ingot of φ85m×380mm under a pressure of 130MPa;

[0023] 3) The obtained ingot is placed in a nitrogen atmosphere and pre-sintered at 700°C for 3 hours to obtain a pre-sintered ingot;

[0024] 4) The obtained pre-sintered ingot is oxidized in an oxygen-containing atmosphere to obtain an oxidized ingot; the process parameters of the oxidation are: pressure 0.6MPa, temperature 850°C, time 4h;

[0025] 5) The obtained oxidized ingot is sintered in a sintering fu...

Embodiment 2

[0034] 1) Weigh 17.6kg of pure silver block, 1.80kg of pure tin block, 0.048kg of pure copper block and 0.054kg of pure bismuth block, put them into an intermediate frequency furnace for melting (melting temperature is 1250°C), and then pass through high-pressure water atomization equipment Carrying out atomization, drying the obtained powder slurry, and passing through a 100-mesh sieve to obtain silver tin oxide powder;

[0035] 2) The obtained silver tin oxide powder is placed in an isostatic press to make a cylindrical ingot of φ80m×380mm under a pressure of 100MPa;

[0036] 3) The obtained ingot is placed in an argon atmosphere and pre-sintered at 600°C for 5 hours to obtain a pre-sintered ingot;

[0037] 4) The obtained pre-sintered ingot is oxidized in an oxygen-containing atmosphere to obtain an oxidized ingot; the process parameters of the oxidation are: pressure 0.8MPa, temperature 800°C, time 5h;

[0038] 5) The obtained oxidized ingot is sintered in a sintering fur...

Embodiment 3

[0041] 1) Weigh 17.6kg of pure silver block and 1.89kg of pure tin block respectively, put them into an intermediate frequency furnace for melting (melting temperature is 1250°C), and then atomize through high-pressure water atomization equipment, and dry the obtained powder slurry , through a 200-mesh sieve to obtain silver tin oxide powder;

[0042] 2) The obtained silver tin oxide powder is placed in an isostatic press to make a cylindrical ingot of φ85m×380mm under a pressure of 150MPa;

[0043] 3) The obtained ingot is placed in a nitrogen atmosphere and pre-sintered at 750° C. for 4 hours to obtain a pre-sintered ingot;

[0044]4) The obtained pre-sintered ingot is oxidized in an oxygen-containing atmosphere to obtain an oxidized ingot; the process parameters of the oxidation are: pressure 0.5MPa, temperature 850°C, time 3h;

[0045] 5) The obtained oxidized ingot is sintered in a sintering furnace, the sintering temperature is controlled to be 880° C., and the sinterin...

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Abstract

The invention discloses a method for preparing silver tin oxide contact materials by high pressure oxidation of alloy powder ingots. The method comprises the following steps: (1) calculating the amount of required materials according to the material ratio of a silver tin oxide contact needing to be prepared, and weighing the corresponding amount of materials to prepare silver tin alloy powder; (2) preparing ingot blanks through the silver tin alloy powder; (3) presintering the ingot blanks in a protecting atmosphere to obtain presentering ingots, wherein the presintering temperature is 300-800 DEG C, and the presintering time is 2-5h; (4) oxidizing the presentering ingots in an oxygen atmosphere to obtain oxidizing ingots, wherein the oxidation process parameters are as follows: the pressure is 0.2-1MPa, the temperature is 600-900 DEG C, and the time is 2-10h; (5) sintering and extruding the obtained oxidizing ingots, and thus obtaining the silver tin oxide contact materials. The method can improve the bonding strength among granular powder, further improves the uniformity of tissue of the silver tin oxide contact materials, and therefore improves the physical and mechanical performance and the electrical performance of the silver tin oxide contact materials.

Description

technical field [0001] The invention relates to the field of metal-based composite materials, in particular to a method for preparing silver-tin oxide contact materials by high-pressure oxidation of alloy powder ingots. Background technique [0002] Existing studies have shown that silver tin oxide material is the most promising environmental protection contact material to replace silver cadmium oxide, but the two problems of poor processing performance and unstable electrical performance of silver tin oxide material have not been effectively solved, which restricts Popularization and application of silver tin oxide materials. [0003] At present, the process methods for preparing silver tin oxide materials in the industry include powder metallurgy method, chemical method and internal oxidation method. The internal oxidation method can be subdivided into alloy internal oxidation method and alloy powder pre-oxidation method. Among them, the alloy internal oxidation method ref...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C5/06B22F3/16B22F3/10H01B13/00
Inventor 陈光明刘心宇黄锡文叶凡王振宇李波周秀娟陈旭
Owner GUILIN ELECTRICAL EQUIP SCI RES INST
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