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A kind of preparation method of iron-based alloy powder for injection molding
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An iron-based alloy and injection molding technology, which is applied in the field of preparation of iron-based alloy powder for injection molding, can solve the problems of low compaction density, poor product formability, high oxygen content of powder, etc., achieve high bulk density and improve product forming Good effect of sex and fluidity
Active Publication Date: 2017-06-06
四川有色金源粉冶材料有限公司
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[0006] The purpose of the present invention is to overcome the problems of low compaction density, high powder oxygen content and poor product formability in the iron-based alloy powder for injection molding prepared by atomization powder making method in the prior art; provide a method to solve the above problems Preparation method of iron-based alloy powder for injection molding
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Embodiment 1
[0025] A method for preparing iron-based alloy powder for injection molding, comprising:
[0026] (1) Put the iron-based alloy powder raw materials into the melting furnace, and vacuumize; in this embodiment, the iron-based alloy powder raw materials are selected as follows: 1.5% copper powder, 0.5% graphite carbon powder, 0.4% manganese powder, and 0.5% molybdenum powder , 1.5% chromium, 0.15% sulfur, and the rest is iron powder;
[0027] (2) Carry out magnetic levitation smelting and purification in the smelting furnace to obtain molten metal;
[0028] (3) The molten metal enters the atomization chamber to be atomized into powder droplets, and the powder droplets are cooled to form solidified powder after passing through the air-spray water cooling or water-spray water-cooling process; In the cooling water, a forming agent solution is added, the forming agent is composed of a silane coupling agent, and the adding amount of the forming agent in the cooling water is 20wt% of ...
Embodiment 2
[0032] This example is a comparative example of Example 1. The difference between this example and Example 1 is that no molding agent solution is added to the cooling water in step (3) in this example, and it is prepared under the same conditions as Example 1. Iron-based alloy powder is produced.
[0033] After testing, the bulk density of the iron-based alloy powder is 2.91g / cm 3 ; Under the pressing pressure of 600MPa, the green density is 7.12g; the oxygen content is higher than 2000ppm.
Embodiment 3
[0035] The difference between this example and Example 1 is that the amount of forming agent added in the process of preparing the iron-based alloy powder in this example is different, and the amount of forming agent added in this embodiment is 5wt% of the metal powder raw material.
[0036] After testing, the bulk density of the iron-based alloy powder is 3.19g / cm 3 ; Under the pressing pressure of 600MPa, the green density is 7.47g; the oxygen content is lower than 1500ppm.
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Abstract
The invention discloses a method for preparing iron-base alloy powder used for injection molding and solves the problems that in the prior art, iron-base alloy powder which is used for injection molding and obtained through an atomization powder processing method is low in density, high in powder oxygen content and poor in product forming property. The method comprises the following steps: 1, adding iron-base alloy powder raw materials into a smelting furnace, and conducting vacuumizing; 2, conducting smelting and purification in the smelting furnace, and obtaining molten metal; 3, making the molten metal enter an atomizing chamber for being subjected to the atomization, obtaining powder molten drops, and obtaining solidified powder through a gas spray water-cooling process or a water spray water-cooling process; adding a forming agent solution into cooling water of the gas spray water-cooling process or of the water spray water-cooling process, wherein a forming agent comprises one or more ingredients selected from a silane coupling agent, a titanate coupling agent, polyethylene glycol and polyvinyl alcohol; 4, screening the powder through a vibratory screen, and obtaining the iron-base alloy powder. The method has the advantages that the compacted density is improved, the powder oxygen content is reduced, and product forming property is improved.
Description
technical field [0001] The invention relates to a preparation method of alloy powder, in particular to a preparation method of iron-based alloy powder for injection molding. Background technique [0002] At present, the iron-based alloy powders used for injection molding are all produced by atomized powder making method, which uses fast moving fluid (atomizing medium) to impact or otherwise break the metal or alloy liquid into fine liquid. Drops, followed by condensation into a solid powder powder preparation method. The atomization method is the best way to produce fully alloyed powder, and its product is called pre-alloyed powder. Each particle of this powder not only has the same uniform chemical composition as the given molten alloy, but also refines the crystal structure due to rapid solidification; eliminating the macro-segregation of the second phase. [0003] The most widely used methods are gas atomization and water atomization. When atomizing pulverization, the ...
Claims
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