A technology for preparing silver tin oxide contact material by powder rolling method

A technology of silver tin oxide and contact materials, which is applied in the direction of metal/alloy conductors, etc., can solve the problems of difficult cleaning of materials, large material loss, and ineffective promotion, so as to improve the mechanical and electrical properties and improve the combination The effect of intensity

Active Publication Date: 2015-08-05
桂林金格电工电子材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the actual application shows that the high-energy ball milling process has the following disadvantages: (1) In order to achieve a better ball milling effect, a high ball-to-material ratio and a long ball milling time are usually used, so the production efficiency is low; (2) It is easy to appear after ball milling. The phenomenon of powder sticking to the ball makes it difficult to clean the material, resulting in large material loss and high process cost; (3) The abrasive wears seriously under long-term high-energy impact, and it is inevitably mixed into the mixed powder, which affects the purity of the material
Therefore, at present, high-energy ball milling has not been effectively promoted in the production and application of silver tin oxide contact materials in batches.

Method used

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  • A technology for preparing silver tin oxide contact material by powder rolling method
  • A technology for preparing silver tin oxide contact material by powder rolling method
  • A technology for preparing silver tin oxide contact material by powder rolling method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Take by weighing -200 mesh silver powder 9kg, mean particle size be 1kg of tin oxide powder of 3 μm, place V-type blender and mix 2 hours, obtain silver oxide mixed powder, silver oxide mixed powder is packed into powder mill (roller The roll diameter is 100mm, the gap between the two rolls is 0.2mm), the rolling speed is controlled at 5m / min, and the sheet material with a thickness of 0.2-0.25mm is processed, and then the obtained sheet material is processed by isostatic pressing Molding, the molding pressure is set at 180MPa, and then heat-preserved and sintered at 850°C for 4 hours, extruded into wire rods at 860°C, with an extrusion ratio of 200, and the wire rods are drawn to the required size according to the conventional drawing process.

[0013] The mechanical and physical properties of the wire rod obtained above are tested, and the results are shown in Table 1 below; the wire rod obtained above is processed into rivets, and its electrical properties are tested ...

Embodiment 2

[0018] Weigh 9 kg of silver powder with a particle size of -300 mesh, 0.95 kg of tin oxide powder with an average particle size of 5 μm, 0.02 kg of copper oxide powder with an average particle size of 15 μm, and 0.03 kg of bismuth oxide powder with an average particle size of 10 μm, and place them in a V-shaped mixer Mix in medium for 2 hours to obtain silver oxide mixed powder, put mixed powder into powder rolling mill (the roll diameter is 200mm, and the gap between the two rolls is 0.5mm), the control rolling speed is 2m / min, and the processing obtains Sheet material with a thickness of 0.5-0.6mm, and then the obtained sheet material is formed by isostatic pressing, the forming pressure is set at 200MPa, and then heat-preserved and sintered at 880°C for 3h, extruded into wire at 800°C, extruded The pressure ratio is 220, and the wire is drawn to the required size according to the conventional drawing process.

[0019] The mechanical and physical properties of the wire rod o...

Embodiment 3

[0024] Weigh 8.8 kg of silver powder with a particle size of -150 mesh, 1.15 kg of tin oxide powder with an average particle size of 1 μm, and 0.05 kg of tungsten oxide powder with an average particle size of 5 μm, and mix them in a V-shaped mixer for 2 hours to obtain a silver oxide mixture. Powder, put the mixed powder into the powder rolling mill (the roll diameter is 60mm, and the gap between the two rolls is 0.5mm), control the rolling speed to 10m / min, and process it into a sheet with a thickness of 0.5mm to 0.6mm material, and then the obtained flake material is formed by isostatic pressing, the forming pressure is set to 100MPa, and then heat-preserved and sintered at 900°C for 5 hours, extruded into wire rod at 900°C, the extrusion ratio is 220, and the wire rod is then conventionally The drawing process performs drawing processing to the required size.

[0025] The mechanical and physical properties of the wire rod obtained above are tested, and the results are shown...

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Abstract

The invention discloses a process for preparing a silver tin oxide contact material through a powder rolling method. The process specifically comprises the following steps: rolling mixed powder of silver oxide into a flaky material with thickness of 0.1-0.6 mm through a rolling mill, and carrying out isostatic pressing, sintering and extruding the obtained flaky material to obtain the silver tin oxide contact material; the diameters of rollers of the rolling mill are 60-200 mm, the gap between two rollers is 0.1-0.6 mm, and the rolling speed is 2-10 m / min. According to the process disclosed by the invention, powder rolling technology is introduced into the conventional powder metallurgic method of preparing silver tin oxide, the mixed powder of silver oxide is rolled by the rolling mill to change the simple distribution state of silver particles and tin oxide particles in the conventional powder metallurgic process, and the tin oxide particles are pressed into the silver particle matrix so as to perfect the bonding strength of silver and tin oxide in the material and improve the mechanical and physical properties and electrical properties of the obtained silver tin oxide contact material.

Description

technical field [0001] The invention relates to the field of metal matrix composite materials, in particular to a process for preparing silver tin oxide contact materials by a powder rolling method. Background technique [0002] At present, the process methods for preparing silver tin oxide contact materials can be divided into three categories: powder metallurgy method, chemical method and internal oxidation method, and the internal oxidation method can be subdivided into alloy internal oxidation method and alloy powder pre-oxidation method. The main process route for preparing silver tin oxide series materials by conventional powder metallurgy is: (silver powder + tin oxide powder + additive powder (if any)) powder mixing→isostatic pressing→sintering→extrusion into wire or strip. The advantage of the conventional powder metallurgy method is that the process is simple, and it can produce silver tin oxide series materials with various composition ratios. The powder mixing me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C5/06C22C32/00B22F3/18H01B1/02
Inventor 陈光明黄锡文叶凡张天锦廖丽丽冯朋飞
Owner 桂林金格电工电子材料科技有限公司
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