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Atomizing method and device for preparing superfine near-spherical low-oxygen metal powder

A technology of metal powder and atomization equipment, which is applied in the field of atomization for preparing ultra-fine near spherical low-oxygen metal powder, can solve the problems of restricting the development of metal injection molding, inability to obtain ultra-fine powder, and increasing post-processing process, etc. Pre-crushing effect, fine particle size, increasing crushing effect

Inactive Publication Date: 2016-02-03
曾克里
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Problems solved by technology

[0009] The gas atomization method can obtain nearly spherical and low oxygen content powder suitable for injection molding, but the yield of fine powder is low, which leads to an increase in cost
The water atomization method can produce cheap metal powder in large quantities, but due to the irregular shape, the fluidity requirement of the feed can only be met by increasing the proportion of the binder
Both of these limit the development of metal injection molding
[0010] The Chinese patent No. ZL99254400.9 discloses a high-pressure water atomization powder making device, which uses 60MPa high-pressure water for atomization, and the obtained powder is polygonal and irregular, which is not conducive to feeding in injection molding. material fluidity
The Chinese patent No. ZL201320565703.X discloses a powder metallurgy high-pressure water atomization pulverization device. By adding a second atomizer, the low-pressure inert gas-neon gas injected from the second nozzle reduces the amount of metal and Oxidation of the alloy reduces the oxygen content of the powder, and the atomization water pressure used is only 10-12MPa, and the prepared powder cannot obtain sufficient ultra-fine powder
The Chinese patent No. ZL201220006798.7 discloses a high-efficiency gas-liquid double-layer flowing water atomization powder making nozzle, in which a certain pressure of gas is passed into the inner layer of the nozzle to form an annular laminar air film, which surrounds the liquid Flow column, so that it is not disturbed by the surrounding gas, the prepared -325 mesh powder is 65%, which is too thick for injection molding, which affects the use
The Chinese invention patent application with the application number 201310304846.X discloses a preparation method of fine spherical stainless steel powder. By establishing a stable argon plasma and adjusting the plasma parameters, the raw material of water atomized irregular stainless steel powder is heated and cooled to solidify After separation, fine spherical stainless steel powder is obtained, but this method increases the post-processing process, and the cost increases significantly

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  • Atomizing method and device for preparing superfine near-spherical low-oxygen metal powder
  • Atomizing method and device for preparing superfine near-spherical low-oxygen metal powder
  • Atomizing method and device for preparing superfine near-spherical low-oxygen metal powder

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Embodiment 1

[0040] Such as Figure 1-Figure 2 As shown, the present embodiment prepares the atomization equipment for ultra-fine near spherical low-oxygen metal powder, including an atomizing leak bag 1, a high-pressure gas atomizing spray plate arranged on the bottom surface of the atomizing leak bag 1, and a high-pressure gas mist The high-pressure water atomizing spray disk 3 on the bottom surface of the spraying disk 2, the atomizing tube 4 arranged on the bottom surface of the high-pressure water atomizing spray disk 3, and the powder collecting tank 5 under the atomizing tube 4, wherein the high-pressure gas atomizing spray The disc 2, the high-pressure water atomizing spray plate 3 and the atomizing cylinder 4 are provided with a mutually communicating channel 6, an atomization area is formed in the channel 6, and the channel 6 is connected with a leak hole provided at the bottom of the atomization leak bag 1. The water level in the atomization cylinder 4 is controlled by a slurry p...

Embodiment 2

[0050] This embodiment uses the same equipment and method as the embodiment 1, but specifically, the embodiment takes the preparation of ultrafine, nearly spherical, low-oxygen 17-4PH stainless steel powder as an example for specific description.

[0051] Weigh 17-4PH ingredients according to weight percentage: Fe: 75.8%, Cr: 16%, Ni: 4%, Cu: 4%, Nb: 0.2%. The total weight is 100kg. It is added to the intermediate frequency melting furnace to heat and melt. When the alloy is melted, use a special composite deoxidizer to deoxidize and remove slag. When the temperature is measured at 1650℃, pour the molten metal into the atomization leak 1. The liquid flows into the atomization area through the leak hole at the bottom of the atomization leak bag 1. The flow rate of the metal liquid is controlled to 10kg / min, the inert atomization gas is nitrogen, the pressure is 0.4MPa, the flow rate is 2m3 / mim, and the annular high-pressure gas nozzle The annular slit width L of 21 is 2mm, and the...

Embodiment 3

[0054] In this embodiment, the atomization method for preparing ultrafine near-spherical low-oxygen metal powder includes the following steps:

[0055] S1 puts the metal raw materials into an intermediate frequency induction furnace for smelting, where the superheat of the metal is 100-200℃, and uses a composite deoxidizer to remove oxygen and slag

[0056] S2 pours the molten metal into the atomization leak of the atomization equipment. The molten metal flows into the mist at a flow rate of 8-20kg / min through the leak hole at the bottom of the leak under the action of gravity, high pressure air flow and negative pressure generated by high pressure water flow. Chemical zone; wherein the high-pressure gas is an inert gas, the pressure is 0.2-0.6MPa, the flow rate is 1-3m3 / min; the pressure of the high-pressure water is 80-120MPa, the flow rate of the high-pressure water is 35-75L / mim.

[0057] The metal liquid stream described in S3 becomes metal droplets under the atomization actio...

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Abstract

The invention discloses an atomizing method and device for preparing superfine near-spherical low-oxygen metal powder. The method includes the step that molten metal liquid flow is broken into liquid drops through high-pressure gas; the liquid drops are broken multiple times through high-pressure water to form finer liquid drops and contract to be in a near-spherical shape in an atomizing cylinder in the flying process; and finally, the liquid drops are solidified to be the superfine near-spherical low-oxygen metal powder. According to the device, compared with traditional gas atomization, the breaking function of high-pressure water is added, and powder is finer in size; due to the fact that the breaking effect of gas is added, the amount of atomizing water is greatly reduced, the contracting process of powder is prolonged, and the degree of sphericility is better than that in traditional water atomization; and in addition, the whole atomization process is conducted in inert protective gas, and therefore the oxygen content of powder is reduced. Furthermore, the technology is advanced and reliable, the technology device is simple, continuity is high, production cost is low, product performance is stable, and the atomizing method and device are suitable for industrial production and can be widely applied to the metal injection molding industry.

Description

technical field [0001] The invention relates to the technical field of metal powder material preparation, in particular to an atomization method and equipment for preparing ultrafine near-spherical low-oxygen metal powder, and the prepared powder is suitable for metal injection molding. Background technique [0002] Metal powder materials are generally prepared by reduction method, mechanical crushing method, electrolysis method and atomization method. The atomization method has become the main method of powder production due to its large production capacity, uniform composition and wide application range. The atomization method is a method in which the molten metal flowing out of the leakage hole is broken into small droplets by high-speed air flow or water flow and cooled into metal powder during flight. The former is called gas atomization method, and the latter is called It is the water atomization method. [0003] The powder produced by the gas atomization method gener...

Claims

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Application Information

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IPC IPC(8): B22F9/08
Inventor 曾克里李志翁廷朱杰宗伟冷丹罗浩周晚珠屈娇王苏英李聪
Owner 曾克里
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