Production method for high cold-pressing formability water atomized pre-alloyed powder

A production method and technology of pre-alloyed powder, applied in the field of powder metallurgy, can solve the problems of large specific surface area, good ductility, complex structure, etc., and achieve the effects of improving cold-press formability, wide applicability and low cost

Active Publication Date: 2019-01-04
HENAN YINGCHUAN NEW MATERIAL INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 2.2 Another way of thinking is to mix copper-containing oxides or salts into the pre-alloy powder, and then decompose at high temperature to remove the non-metal, and finally a part of the remaining copper will be plated on the surface of the pre-alloy powder, so that the original It is a change on the surface of the spherical pre-alloyed powder. The structure is more complex, the specific surface area is larger, and the hardness of copper is low and the ductility is good. It is of great help to the cold formability of the pre-alloyed powder, but due to the plating The layer and the original powder are simply combined without alloying, so strictly speaking, the powder produced by this method is a mixed powder of pre-alloyed powder and elemental powder, and its performance is far inferior to that of pure Properties of Alloyed Powders

Method used

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  • Production method for high cold-pressing formability water atomized pre-alloyed powder
  • Production method for high cold-pressing formability water atomized pre-alloyed powder
  • Production method for high cold-pressing formability water atomized pre-alloyed powder

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Embodiment 1

[0027] A production method of water atomized pre-alloyed powder with high cold press formability, the process flow chart is shown in figure 1 shown, including the following steps:

[0028] 1) Weigh 50kg of raw materials required for the production of pre-alloyed powder, including 70wt% iron and 30wt% copper; prepare semi-finished pre-alloyed powder by water atomization pulverization process, the temperature of the metal solution is 1550-1600°C, the nozzle diameter is 5mm, and the water flow angle 40°, water pressure 80Mpa, water flow rate 200L / min, use high-pressure water to break the molten steel into tiny droplets in the atomizer, and screen -400 mesh semi-finished iron-copper pre-alloyed powder after cooling. In other embodiments, the metal solution is any one or a combination of two or more of iron, copper, nickel, tin, zinc, cobalt, tungsten, molybdenum, vanadium, chromium, preferably, the pre-alloyed powder contains iron copper , one of iron copper nickel, iron copper n...

Embodiment 2

[0033] A production method of water atomized pre-alloyed powder with high cold press formability, the process flow chart is shown in figure 1 shown, including the following steps:

[0034] 1) Weigh 50 kg of raw materials required for the production of iron-based pre-alloyed powder for powder metallurgy, including 82 wt % iron, 13 wt % chromium, 1 wt % molybdenum, 1 wt % tungsten, 1 wt % vanadium, and 2 wt % carbon, using water The semi-finished pre-alloy powder is prepared by the atomization pulverization process. The temperature of the metal solution is 1650-1700°C, the diameter of the nozzle is 4.5mm, the water flow angle is 40°, the water pressure is 65Mpa, and the water flow rate is 180L / min. Broken into tiny droplets, screened -400 mesh semi-finished iron-based pre-alloyed powder after cooling;

[0035]2) Control the moisture content of the semi-finished pre-alloyed powder to 1 wt %, and the oxygen content to 0.6 wt %, and then put it in a vacuum drying oven at 100 ° C f...

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Abstract

The invention discloses a production method for high cold-pressing formability water atomized pre-alloyed powder. The production method comprises the following step (1) of preparing 400-mesh semi-finished pre-alloyed powder; the step (2) of controlling the moisture content of the semi-finished pre-alloyed powder to be 1 wt%-2 wt% and the oxygen content to be 0.6 wt%-0.8 wt%, and then drying in a vacuum drying oven at 100 DEG C for 90 min-120 min, so that powder particles are bonded preliminarily; and the step (3) of crushing the powder particles bonded preliminarily after reduction and annealing, and screening the crushed particles. Through the production method, quasi-spherical power is changed into the powder of more complicated shapes, such as rice panicle, grape and satellite, and thecold-pressing formability of the pre-alloyed powder is improved greatly; according to the production method, only simple surface modification of the powder is performed, and other performances are notchanged; and the production method is extremely high in applicability.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to a production method of water atomized pre-alloyed powder with high cold press formability. Background technique [0002] Pre-alloyed powders for powder metallurgy and diamond tools are expected to have more complex particle shapes in order to obtain good formability and higher green strength. However, the most easily mass-produced high-pressure water atomization powder making technology on the market currently produces powders that are generally spherical in shape, with underdeveloped surface structures and poor cold-press formability. In recent years, the widespread use of fully automatic machinery and equipment has put forward higher requirements for the cold-formability of pre-alloyed powders, and the quality of cold-formation also restricts the development of powder-using manufacturers. The existing improvement methods are as follows: [0003] 1. Impro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/04B22F9/08B22F9/22B22F1/14B22F1/142
CPCB22F9/04B22F9/082B22F9/22B22F2998/10B22F1/142B22F1/14B22F2009/0828B22F2009/086B22F2009/088B22F9/08B22F2009/049B22F2009/0808B22F2301/35
Inventor 李晓峰樊安定豆大根芦亚楠安文文
Owner HENAN YINGCHUAN NEW MATERIAL INC
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