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
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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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