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Low-oxygen pure-silver melt material casting preparing method

A pure silver and melt technology, applied in the field of low-oxygen pure silver melt material melting and casting preparation, can solve the problems of increased silver volatilization loss, and achieve the effects of reducing oxygen content, avoiding pollution, and increasing contact area

Inactive Publication Date: 2020-02-11
ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Silver will be oxidized during smelting. When the oxidation is strong, there is no covering agent on the liquid surface of molten silv

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Choose a vacuum melting furnace with a capacity of 25kg, put the silver ingot with an oxygen content of 186ppm and a weight of 24kg into the graphite crucible, put 500g of activated carbon powder into the hopper in the vacuum furnace, and put a graphite mold with a hole diameter of 100mm and a height of 260mm into the vacuum For the casting mold station of the furnace, place the graphite crucible in the vacuum furnace, close the vacuum furnace cover, set the melting temperature to 900°C, and the vacuum degree to 5.0×10 -3 Pa, turn on the power supply and start to heat up, carry out a vacuum melting and a deoxidation; after the silver ingot sweats, feed high-purity argon until the vacuum degree is 0.1Pa, and continue heating. After the silver ingot is completely melted into a silver solution, start the feeding button, pour the activated carbon powder into the crucible, keep it warm for 20 minutes, and then start casting the ingot. After the ingot is cooled, open the furna...

Embodiment 2

[0024] Choose a vacuum melting furnace with a capacity of 25kg, put silver ingots with an oxygen content of 186ppm and a weight of 24kg into a graphite crucible, put 500g of activated carbon powder into a hopper in the vacuum furnace, and put a graphite mold with an aperture of 100mm and a height of 260mm into a vacuum For the casting mold station of the furnace, place the graphite crucible in the vacuum furnace, close the vacuum furnace cover, set the melting temperature to 910°C, and the vacuum degree to 5.0×10 -3 Pa, turn on the power supply and start to heat up, carry out a vacuum melting and a deoxidation; after the silver ingot sweats, feed high-purity argon until the vacuum degree is 0.2Pa, and continue heating. After the silver ingot is completely melted into a silver solution, start the feeding button, pour the activated carbon powder into the crucible, keep it warm for 25 minutes, and then start casting the ingot. After the ingot is cooled, open the furnace cover and ...

Embodiment 3

[0026] Choose a vacuum melting furnace with a capacity of 25kg, put the silver ingot with an oxygen content of 186ppm and a weight of 24kg into the graphite crucible, put 500g of activated carbon powder into the hopper in the vacuum furnace, and put a graphite mold with a hole diameter of 100mm and a height of 260mm into the vacuum For the casting mold station of the furnace, place the graphite crucible in the vacuum furnace, close the vacuum furnace cover, set the melting temperature to 930°C, and the vacuum degree to 5.0×10 -3 Pa, start the power supply and start to heat up, carry out a vacuum smelting and a deoxidation; after the silver ingot sweats, feed high-purity argon until the vacuum degree is 0.5 Pa, and continue heating; Pour the powder into the crucible, keep it warm for 30 minutes, and then start to cast an ingot. After the ingot is cooled, open the furnace cover, take out the ingot from the mold, cut off the riser part with a length of 23mm, and obtain an ingot. ...

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PUM

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Abstract

The invention relates to a low-oxygen pure-silver melt material casting preparing method. The low-oxygen pure-silver melt material casting preparing method comprises the specific steps of 1) putting asilver ingot into a graphite crucible, putting activated carbon powder into a hopper, putting a graphite mold into a casting mold station of a vacuum furnace, closing a vacuum furnace cover, and rising the temperature to conduct primary vacuum melting; 2) after the silver ingot is completely melted into a silver solution, pouring the activated carbon powder into the graphite crucible, keeping thetemperature for standing for 15-30 minutes, and starting pouring to obtain a cast ingot; 3), after the cast ingot is cooled, opening the furnace cover, removing the cast ingot from the mold, cuttingoff a riser part, and obtaining a primary cast ingot; and 4), performing secondary vacuum smelting on the cast ingot, cooling the cast ingot, taking out the cast ingot, cutting off a riser again, obtaining a secondary cast ingot, and finishing preparation. In summary, the silver ingot prepared by the method has low oxygen content and high purity.

Description

technical field [0001] The invention belongs to the field of manufacturing sterling silver fuse melt materials, and in particular relates to a preparation method for melting and casting low-oxygen sterling silver melt materials. Background technique [0002] Fuses are widely used in high-voltage and low-voltage power distribution systems, control systems, and electrical equipment. As short-circuit and over-current protectors, fuses are one of the most commonly used protection devices. When the fuse passes through an excessive current, the melt material must be fused in time to protect the electrical appliances. The chemical composition, resistivity, and dimensional accuracy of the melt material all affect the performance of the melt material. With the rapid development of modern manufacturing industry, electrical products are increasingly developing in the direction of large capacity, small volume, and differentiation, and higher requirements are put forward for melt materia...

Claims

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Application Information

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IPC IPC(8): C22B11/02C22B9/04B22D7/00B22D31/00
CPCB22D7/00B22D31/00C22B9/04C22B11/02
Inventor 张雷潘建军钟素娟马佳于奇孙华为纠永涛
Owner ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD