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Preparation process of silver tin oxide electric contact material

An electrical contact material, silver tin oxide technology, applied in contact materials, contacts, circuits, etc., can solve the problems of slow oxidation, difficult cold processing, poor mechanical properties of materials, etc.

Inactive Publication Date: 2007-07-18
沈阳金纳新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the internal oxidation of AgSn alloy powder with more than 4% Sn is still slow, and it is still easy to form SnO 2 In the case of Ag-coated particles, SnO is obtained during powder metallurgy processing 2 Ag-segregated organization, grain boundaries rich in SnO 2 , the mechanical properties of the material are poor, and it is difficult to cold process (drawing wire, riveting, etc.)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The AgSn alloy powder containing 4% Sn is prepared by air atomization method, and the particle size of the silver-tin alloy powder after sieving is 2 (Containing 5% CuO) mixed with AgSn powder, calculate SnO 2 The final content in the mixture is 10%. After mixing in the mixing tank for 30 minutes, put it into a high-energy ball mill to evacuate and ventilate the argon ball mill. The ball-to-material ratio is 30:1, and the speed of the ball mill is 500r / min. The jacket of the ball mill is water-cooled After ball milling, the powder was oxidized and annealed in an air furnace at 550°C for 5 hours, then cold-pressed, sintered, hot-pressed, re-fired and re-pressed, extruded into wires with a diameter of 6mm, and then cold-drawn to the final size.

Embodiment 2

[0026] The AgSn alloy powder containing 2% Sn is prepared by air atomization method, and the particle size of the silver-tin alloy powder after sieving is 2 (with 2% WO 3 ) mixed with AgSn powder, calculate SnO 2 The final content in the mixture is 10%. After mixing in the mixing tank for 30 minutes, put it into the high-energy ball mill, vacuumize and ventilate the argon ball mill, the ball-to-material ratio is 20:1, the ball mill speed is 400r / min, and the time is 4 Hours, after ball milling, the powder is annealed under argon protective atmosphere, cold pressed, sintered, hot pressed, refired and repressed under argon protective atmosphere, extruded into a plate with a diameter of 20×75mm, and hot pressed with a 5mm pure silver plate Composite, the primary deformation is greater than 60%, cold rolled to the final 3mm, and then oxidized in an air furnace at 500 degrees for 5 hours.

Embodiment 3

[0028] The AgSnCu alloy powder containing 4% Sn and 1% Cu is prepared by air atomization method, and the particle size of the silver-tin alloy powder after sieving is 2 Mixed with AgSnCu powder, calculated SnO 2 The final content in the mixture is 12%, and an additional 1% of In 2 o3 , mixed in the mixing tank for 30 minutes and then put into a high-energy ball mill, vacuumed and argon ball milled, the ball-to-material ratio was 20:1, the speed of the ball mill was 400r / min, and the time was 4 hours. Medium oxidation and annealing for 2 hours, after cold pressing, sintering, hot pressing, re-firing and re-pressing, it is extruded into wires with a diameter of 5mm, and then cold drawn to the final size.

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Abstract

The preparation process of silver-tin oxide electric contact material features the material comprising 150 mesh SnO2 powder in 2-12 wt% and 50-1000 mesh AgSn alloy powder with Sn content of 1-5 wt% for the rest. The preparation process includes no-air ball milling or forced mixing the said material to obtain compound powder, and forming before or after internal oxidation to produce the electric contact material. Thus process has powder metallurgy and internal oxidation and the prepared silver-tin oxide electric contact material has excellent electric performance and mechanical performance.

Description

Technical field: [0001] The invention relates to the preparation technology of electric contact materials, and in particular provides a preparation method of silver tin oxide electric contact materials. Background technique: [0002] With the rapid development of modern industry, the level of industrialization and intelligence of control appliances is getting higher and higher, the load of high-voltage power transmission and transformation network is increasing, the low-voltage power distribution system and control system are constantly developing, and the electronic industry products are updated. Electric products are developing in the direction of large capacity and small volume. As a result, higher requirements are put forward for the electrical contact material, the heart component of electrical products, that is, the material is required to have no fusion welding under the condition of extremely large arc heat and Joule heat, and has good mechanical wear and electrical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02H01H1/02H01H1/021H01H1/023H01H1/0237
Inventor 李洪锡夏春明程陆凡张湃张国虎姜涛
Owner 沈阳金纳新材料股份有限公司
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