A kind of rapidly oxidizable silver tin oxide indium oxide electrical contact material and preparation method thereof
An electrical contact material, silver oxide technology, applied in contact materials, contacts, circuits, etc., can solve problems such as affecting the quality of subsequent welding, difficulty in mass production, and concave welding surfaces, achieving high production efficiency, Consistent particle size and good welding performance
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Embodiment 1
[0046] To prepare Ag(92)SnO 2 -In 2 o 3 Electrical contact material as an example
[0047] In the first step, Ag ingots, Sn ingots, In ingots, and additive Ni are melted and ingot-cast. Wherein the Ag content is 93.5wt%, the Sn content is 4.7wt%, the In content is 2.5wt%, and the Ni content is 0.3wt%.
[0048] In the second step, atomize the molten alloy after melting in the first step, and the atomizing gas pressure is 1.0 Mpa.
[0049] In the third step, the atomized powder is sieved and isostatically pressed, with a mesh size of 600; the isostatic pressure is 70Mpa, and the holding time is 120s.
[0050] In the fourth step, the obtained ingot is sintered at a temperature of 820° C. for 2 hours, under the protection of a mixed gas of hydrogen and nitrogen.
[0051] The fifth step is to hot-extrude the sintered ingot at a temperature of 720° C. for 2 hours, under the protection of hydrogen-nitrogen mixed gas, wherein the extruded plate has a thickness of 20 mm and a widt...
Embodiment 2
[0059] To prepare Ag(80)SnO 2 -In 2 o 3 Electrical contact material as an example
[0060] In the first step, Ag ingots, Sn ingots, In ingots, and additive Cu elements are melted and ingot-cast. The Ag content is 83.5wt%, the Sn content is 12wt%, the In content is 4wt%, and the additive Cu is 0.5wt%.
[0061] In the second step, the alloy melt after the first step of melting is atomized, and the atomizing gas pressure is 10Mpa.
[0062] In the third step, the atomized powder is sieved and isostatically pressed, with a sieve mesh of 100 meshes; the isostatic pressure is 200Mpa, and the holding time is 30s.
[0063] The fourth step is to sinter the obtained ingot at a temperature of 650° C. for 7 hours and H2 gas protection.
[0064] The fifth step is to hot-extrude the sintered ingot at a temperature of 600°C for 4 hours and charcoal protection, wherein the thickness of the extruded plate is 15mm and the width is 60mm.
[0065] The sixth step is to clean the plate and com...
Embodiment 3
[0072] To prepare Ag(90)SnO 2 -In 2 o 3 Electrical contact material as an example
[0073] In the first step, Ag ingots, Sn ingots, In ingots, additives Ni, and Cu elements are melted and ingot-cast. The Ag content is 93wt%, the Sn content is 4.5wt%, the In content is 1.5wt%, the additive Ni is 0.5wt%, and the Cu is 0.5%.
[0074] In the second step, the alloy melt after the first step of smelting is atomized, and the atomizing gas pressure is 5Mpa.
[0075] In the third step, the atomized powder is sieved and isostatically pressed, with a mesh size of 200 mesh; the isostatic pressure is 100Mpa, and the holding time is 70s.
[0076] The fourth step is to sinter the obtained ingot at a temperature of 750° C. for 5 hours and H2 gas protection.
[0077] The fifth step is to hot-extrude the sintered ingot at a temperature of 680°C for 3 hours and charcoal protection, wherein the thickness of the extruded plate is 10mm and the width is 70mm.
[0078] The sixth step is to clea...
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