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Preparation method for superfine spherical stainless steel powder

A stainless steel and powder technology is applied in the field of preparation of fine spherical stainless steel powder, which can solve the problems of high technical difficulty, high cost, and limitation of the popularization and application of gas atomized stainless steel powder.

Inactive Publication Date: 2013-11-13
JIANGXI YUEAN SUPERFINE METAL
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Problems solved by technology

[0004] The traditional water atomization method and gas atomization method are widely used methods for preparing stainless steel powder, but there are great differences in the quality, performance and cost of the prepared stainless steel powder, which are mainly reflected in the following aspects: (1) Water atomization Milling has certain advantages in powder fineness and cost, but the resulting powder is basically irregular in shape, which greatly affects the performance of subsequent stainless steel products and the development of the metal powder injection molding industry
(2) Gas atomization powder has certain advantages in powder oxygen content and powder sphericity, but the overall particle size of the formulated powder is relatively coarse, high cost, and technically difficult, which greatly limits the use of gas atomized stainless steel powder in metal powder injection. Promotion and application in molding industry

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  • Preparation method for superfine spherical stainless steel powder
  • Preparation method for superfine spherical stainless steel powder
  • Preparation method for superfine spherical stainless steel powder

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preparation example Construction

[0019] A kind of preparation method of fine spherical stainless steel powder, flow process is as follows figure 1 shown, follow the steps below:

[0020] 1. Establish a stable argon plasma torch: input 0.5MPa, 0.6MPa or 0.8MPa continuous main working gas argon flow into the plasma reactor, auxiliary working gas hydrogen input pressure is 0.5MPa, 0.6 MPa or 0.8MPa, induction coil Load to a certain power, the power can be 20 kW, 30 kW or 50 kW, at the same time the igniter discharges, the high voltage coil is inductively coupled and the igniter corona is triggered, and the argon gas is ionized to generate an argon plasma torch. At this time, maintaining a negative pressure in the entire plasma reactor can ensure the stable operation of the plasma torch.

[0021] 2. Use nitrogen gas to inject water atomized irregular stainless steel powder (raw powder) into the high temperature zone of the core of the argon plasma torch for heating. The heating time ends with the gas powder flo...

Embodiment 1

[0025] Example 1: The average particle size of raw material water atomized irregular stainless steel powder 316L is 9.8 μm, the oxygen content of the powder before spheroidization is 2300 ppm, and the powder tap density is 3.53 g / cm 3 , The input power of the argon plasma during the spheroidization process is 30kW, and the system negative pressure is maintained at 130mm Hg. The main plasma working gas argon and the auxiliary gas hydrogen pressure are both 0.5MPa. The pressure of the carrying gas nitrogen is 0.6MPa, the flow rate of the carrying gas is 600L / h, the feeding rate of water atomized irregular stainless steel powder is 40g / min, the average particle size of the powder after spheroidization is 10.3μm, and the oxygen content of the powder is 2230ppm , the powder tap density is 4.76 g / cm 3 .

Embodiment 2

[0026] Example 2: The average particle size of raw material water atomized irregular stainless steel powder 316L is 11 μm, the oxygen content of the powder before spheroidization is 2450 ppm, and the powder tap density is 3.68 g / cm 3 , The input power of argon plasma during the spheroidization process is 35kW, and the negative pressure of the system is maintained at 180mm Hg. The main plasma working gas argon and auxiliary gas hydrogen pressure are 0.6MPa. The pressure of the carrying gas nitrogen is 0.75MPa, the flow rate of the carrying gas is 700L / h, the feeding rate of water atomized irregular stainless steel powder is 35g / min, the average particle size of the powder after spheroidization is 11.6μm, and the oxygen content of the powder is 2430ppm , the powder tap density is 4.83 g / cm 3 .

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Abstract

The invention relates to a stainless steel powder preparation method for metal powder injection molding, in particular to a method for preparing superfine spherical stainless steel powder by plasma spherifying. Stable argon plasmas are constructed, and plasma parameters are adjusted, so that a water-atomized irregular stainless steel powder raw material is heated, and is separated to obtain the superfine spherical stainless steel powder after being cooled and cured, and compared with the original water-atomized irregular stainless steel powder raw material, spherified stainless steel powder has higher flowability, tap density and purity. According to the method, the problems of poor flowability, low apparent density, low operational performance and the like caused by irregular shapes such as a flake shape, a strip shape and a branch shape in the conventional water-atomized stainless steel powder are solved, the quality of the stainless steel powder and the performance of a stainless steel product are improved, the added value and the market competitiveness of the water-atomized stainless steel powder are improved, and the method is low in cost.

Description

technical field [0001] The invention belongs to a method for preparing stainless steel powder for metal powder injection molding, in particular to a method for preparing fine spherical stainless steel powder. Background technique [0002] The new powder metallurgy near-net shape technology with the fastest development and the most application potential in the international powder metallurgy field is known as the most popular component preparation technology today. With the development of modern powder metallurgy technology, powder metallurgy products are developing in the direction of high strength, high density, high precision and complex shape, and there are more and more stainless steel products, accounting for an increasing proportion. [0003] In metal powder injection molding, the greater the tap density of the metal powder, the lower the content of the binder used in the production process, the smaller the size change during sintering, the better the performance, and ...

Claims

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Application Information

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IPC IPC(8): B22F9/08
Inventor 邹海平李显信李上奎王兵
Owner JIANGXI YUEAN SUPERFINE METAL
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