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Preparation method for silver stannic oxide wire

A technology of silver tin oxide and wire material, which is applied in the direction of contacts, electrical components, electric switches, etc., can solve the problems of difficult processing, poor compactness, and low material strength, achieve uniform grain size, and enhance welding resistance and burn resistance, high strength specific modulus effect

Active Publication Date: 2012-06-20
ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The problem to be solved by the present invention is to improve the problems of low strength, poor compactness and difficult processing of materials in the prior art.

Method used

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  • Preparation method for silver stannic oxide wire
  • Preparation method for silver stannic oxide wire
  • Preparation method for silver stannic oxide wire

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Embodiment 1: Ag ingots, Sn ingots and Cu rods are smelted, then water atomized, the powder is dried, the powder is passed through a 350 mesh sieve, and SnO with an average particle size of 2-3 μm and a weight percentage of 5% is added. 2 , with an average particle size of 1-2 μm and 1% by weight of WO 3 The average particle size is 1-2μm, the weight percentage is 0.1% WC, the powder is mechanically mixed for 3 hours, and the uniformly mixed powder is oxidized at a temperature of 350°C in the air environment for 1 hour, and then the powder is oxidized under the oxygen pressure and temperature of 0.6MPa. Oxidize at 850°C for 4 hours. After oxidation, the powder is isostatically pressed at 80MPa and held for 5 seconds, and pressed into a spindle with a diameter of 85-88mm. The spindle is kept at 880°C for 6 hours and the temperature is lowered by 700°C. Keep warm for 1 hour, extrude into a Ф4mm wire, and then hot draw the wire into a Ф1.88mm wire.

[0035] The physical ...

Embodiment 2

[0039] Embodiment 2: Ag ingots, Sn ingots and In ingots are smelted, then atomized, the powder is dried, the powder is passed through a 350 mesh sieve, and an additive of 35% by weight is added. The additive has an average particle size of 2- 3μm SnO 2 , GeO, Dy with an average particle size of 1-2μm 2 o 3 . After all the above powders were mechanically mixed for 3 hours, they were oxidized at 550°C for 3 hours in the air environment, and then raised to 850°C for 8 hours. In isostatic pressing at 220MPa, it is pressed into a spindle with a diameter of 105-108mm. The spindle is kept and sintered at a temperature of 880°C for 7 hours, extruded into a diameter of Ф8mm, and then the wire is hot-drawn into a wire of Ф1.88mm.

[0040] The physical properties of the materials are compared in the following table

[0041]

[0042] Metallographic structure such as Figure 7 As shown, the grains of the refined product in this embodiment are uniform.

[0043] In contrast, the pro...

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Abstract

A preparation method for a silver stannic oxide wire includes the steps of uniformly mixing prepared AgSn (silver-stannum) powder and SnO2 (stannic oxide) powder with additives, wherein the additives optionally comprise one or more of CuO (cupric oxide), GeO2 (germanium dioxide), Dy2O3(dysprosium oxide), WO3 (tungsten trioxide), WC (tungsten carbide) and W (tungsten); then placing the mixed powder into an aerobic environment; pressing the oxidized powder into a spindle by an isostatic press under the pressure; sintering the spindle at the high temperature; extruding the sintered spindle into a wire and drawing the extruded wire into the wire with the corresponding diameter. Silver stannic oxide particles prepared by the method are fine and uniform in metallographic structures, the types of the additives are unlimited, and processability, rivet forging performance and electrical performance of the materials are improved.

Description

technical field [0001] The invention relates to a preparation method of an electrical contact material, belonging to the technical field of metal matrix composite materials. Background technique [0002] AgSnO 2 Electrical contact materials are mainly used in electrical switches such as relays, contactors, motors, switches, etc. These two materials are currently the most commonly used environmental protection materials in low-voltage electrical appliances, and can be produced on a large scale. With the development of miniaturization of relays, there are also updated requirements for contact materials with anti-welding properties. Existing AgSnO 2 The composite material adopts the traditional mixed powder sintering extrusion process, the tin oxide particles are coarse, the material compactness is not good, and the additive components are seriously agglomerated. The coating method and co-deposition chemical method are used only, and the material strength is poor. The inter...

Claims

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Application Information

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IPC IPC(8): H01H1/021H01H1/0237H01H11/00
Inventor 颜小芳柏小平刘立强翁桅林万焕朱礼兵刘轶
Owner ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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