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A kind of preparation method of gas-atomized iron-silicon-aluminum powder

A technology of sendust powder and gas atomization, which is applied in the field of preparation of gas atomized sendust powder, can solve problems such as unfavorable oxygen content and easy oxidation of aluminum, achieve high metal yield, reduce equipment cost, avoid Effect of vacuum operation

Active Publication Date: 2021-11-30
HUNAN SPECIAL METAL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when iron-silicon-aluminum alloy is smelted under non-vacuum conditions, the melting temperature of aluminum is the same as that of iron and silicon, and aluminum is easily oxidized, which is not conducive to the effective control of oxygen content.

Method used

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  • A kind of preparation method of gas-atomized iron-silicon-aluminum powder
  • A kind of preparation method of gas-atomized iron-silicon-aluminum powder

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preparation example Construction

[0030] A preparation method of gas atomized ferrosilicate powder, comprising the steps of:

[0031] Step 1. Use two smelting furnaces to smelt a certain ratio of iron-silicon alloy and aluminum respectively, and the smelting furnace mouth is protected by a nitrogen atmosphere;

[0032] Step 2. When the temperature of the smelted iron-silicon alloy melt and aluminum melt reaches the set pouring temperature, they are poured into the tundish 3 together;

[0033] Step 3, the iron-silicon alloy melt and the aluminum melt enter the gas atomization chamber 4 through the leak nozzle at the bottom of the tundish 3, and use high-pressure nitrogen to atomize the mixed melt, crush the mixed melt into droplets, and After the droplet is cooled, sendust powder is obtained.

[0034] The present invention smelts iron-silicon alloy and aluminum separately under open conditions, and then pours the melt into the tundish 3 by means of opposite pouring, and the mixed melt is introduced into the ga...

Embodiment 1

[0042] Step 1. Use the first smelting furnace 1 to smelt the iron-silicon alloy, and use the second smelting furnace 2 to smelt aluminum metal. The smelting furnace mouths of the first smelting furnace 1 and the second smelting furnace 2 are protected by a nitrogen atmosphere, wherein the iron-silicon alloy And the amount of aluminum metal meets Si content 7%wt, Al content 4%wt, Fe content balance;

[0043] Step 2. When the smelted iron-silicon alloy melt and aluminum melt reach the set pouring temperature, they are poured into the tundish 3 together by opposite pouring; the pouring temperature of the iron-silicon alloy melt is 1580°C, the pouring temperature of the aluminum melt is 810°C. The flow rates of the iron-silicon alloy melt and the aluminum melt during pouring are 12kg / min and 0.7kg / min, respectively. The temperature condition during pouring, the mode of opposite pouring and the pouring flow rate of the present invention can make the iron-silicon alloy melt and the...

Embodiment 2

[0048] Step 1. Use the first smelting furnace 1 to smelt the iron-silicon alloy, and use the second smelting furnace 2 to smelt aluminum metal. The smelting furnace mouths of the first smelting furnace 1 and the second smelting furnace 2 are protected by a nitrogen atmosphere, wherein the iron-silicon alloy And the amount of aluminum metal meets Si content 10%wt, Al content 6%wt, Fe content balance;

[0049] Step 2. When the smelted iron-silicon alloy melt and aluminum melt reach the set pouring temperature, they are poured into the tundish 3 together by opposite pouring; the pouring temperature of the iron-silicon alloy melt is 1650°C, the pouring temperature of the aluminum melt is 1000°C. The flow rates of the iron-silicon alloy melt and the aluminum melt during pouring are 12.5kg / min and 0.8kg / min respectively. The temperature condition during pouring, the mode of opposite pouring and the pouring flow rate of the present invention can make the iron-silicon alloy melt and ...

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Abstract

The invention provides a method for preparing gas-atomized iron-silicon-aluminum powder, which comprises the following steps: using two melting furnaces to melt iron-silicon alloy and aluminum respectively, and the mouth of the melting furnace is protected by nitrogen gas; melting the iron-silicon alloy melt and aluminum The solids are poured into the tundish together, and enter the gas atomization chamber through the leak nozzle at the bottom of the tundish, and use high-pressure nitrogen to atomize and mix the melt into droplets, and the sendust powder is obtained after the droplets are cooled. The invention can overcome the major obstacle that the gas atomization process cannot be carried out due to the different melting points of iron-silicon-aluminum, which causes the low-melting aluminum to produce oxidized slag and block the leak nozzle, so that the gas atomization process can still go smoothly in the non-vacuum state. The performance of the prepared sendust aluminum powder can meet the needs of customers, the actual metal recovery rate is high, industrial production can be realized under non-vacuum conditions, the operation is simple, the production efficiency is high, the equipment cost is greatly reduced, the maintenance is convenient, and the product performance is better. excellent.

Description

technical field [0001] The invention belongs to the field of alloy powder preparation, and in particular relates to a preparation method of gas-atomized iron-silicon-aluminum powder. Background technique [0002] The melting point of iron in the metal is 1583°C, the melting point of silicon is 1410°C, and the melting point of aluminum is 660°C. When the three metals are smelted into alloys under non-vacuum conditions, aluminum is easily oxidized and slag-forming in the melt. During the process, the aluminum slag will prevent the melt from entering the gas atomization chamber through the leak nozzle with a diameter of about 5mm, so that the production process cannot be carried out normally. [0003] In the prior art, the production of gas-atomized sendust aluminum powder generally adopts a vacuum furnace to smelt sendust aluminum alloy, and then the alloy melt is passed through a gas atomization method, and high-pressure nitrogen gas is used to gas-atomize the alloy melt to o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/08C22C38/02C22C38/06
CPCB22F9/082C22C38/02C22C38/06
Inventor 江权刘维荣黄文杰银瑰许定胜吴秀玲赵凯
Owner HUNAN SPECIAL METAL MATERIALS CO LTD