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High-compressibility water atomization iron powder and preparation method thereof

A water-atomized iron powder and high-compression technology, applied in the field of powder metallurgy, can solve the problems of high quality of raw molten iron and low impurity content, and achieve the effect of increasing added value and expanding the scope of application

Inactive Publication Date: 2012-02-15
CENT SOUTH UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The raw material used by Canada's Quebec Metal Powder Company is high-carbon pure molten iron, a by-product of ilmenite smelting. The raw material molten iron has high quality and low impurity content. Quebec Metal Powder Company's strict requirements for raw materials limit its production process. Large-scale production is carried out in my country, and the density of the green compact under the pressure of 600MPa is currently greater than 7.20g cm at home and abroad -3 There is no public report on the high compressibility iron powder production process and key process quality control technology

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  • High-compressibility water atomization iron powder and preparation method thereof
  • High-compressibility water atomization iron powder and preparation method thereof
  • High-compressibility water atomization iron powder and preparation method thereof

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Embodiment Construction

[0038] Select molten steel whose molten steel composition after smelting meets the raw material composition requirements of the present invention, and prepare raw material iron powder through water atomization, and obtain raw powder after primary reduction, primary magnetic separation, dehydration, drying, and secondary magnetic separation of raw material iron powder , then, evenly fill the raw powder in the iron boat, the material layer thickness is 30mm, push it into the high temperature zone of the molybdenum wire furnace for secondary reduction, and the reduction atmosphere is H as the furnace heats up. 2 atmosphere, h 2 The flow rate is 6~8L·min -1 , Furnace pressure: 0.02-0.03MPa, the other end of the furnace tube is always in a burning state. The holding time is 1 to 3 hours, and it is taken out after cooling to room temperature with the furnace. After the secondary reduction, the obtained powder is disintegrated, sieved, and batched to obtain high compressibility iro...

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Abstract

The invention relates to a method for preparing high-compressibility iron powder with a water atomization process. In the method, scrap steel is used as a raw material; and through the control on the content of alloy element impurities during the selection of the raw material, control on the components of smelting molten steel and control on the factors of atmosphere, time, temperature and the like in the secondary reduction process, the purity of the iron powder is improved to more than 99.5%, the micro-hardness of the powder is reduced, and the powder feature is changed, thus the compressibility of the iron powder is improved, i.e. the compressibility of the processed iron powder reaches more than 7.20g / cm<3> (by single-axial pressing under 600MPa). According to the invention, the scrapsteel or unqualified water atomization iron powder is used as the raw material, thus the produced high-compressibility iron powder can be widely used for producing high-density and high-strength powder metallurgy members.

Description

technical field [0001] The invention discloses a high-compressibility water-atomized iron powder and a preparation method thereof, which belong to the technical field of powder metallurgy (metal materials), and are suitable for producing high-performance parts with complex shapes, such as high-performance structural parts in automobiles: engine parts, transmissions Box transmission gear, sprocket, etc. Background technique [0002] Compressibility is one of the most important process properties of iron and steel powder products. Under the condition of constant pressing pressure and mold tooling, powder compressibility directly determines the density and mechanical properties of parts. With the rapid development of industries such as automobiles, motorcycles, home appliances, and machinery manufacturing, the demand for steel powder has increased sharply. Modern powder metallurgy products are developing in the direction of high density, high strength, and complex shapes, whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/08B22F9/22C22C38/42
Inventor 李松林崔建民袁勇张德金徐从京于永亮
Owner CENT SOUTH UNIV
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