Atomization spray disc and method for preparing narrow particle size alloy powder for additive manufacturing by gas atomization

A technology of alloy powder and atomization spraying, which is applied in the fields of additive processing, metal processing equipment, transportation and packaging, etc., can solve the problem of low yield of alloy powder, etc., and achieve high practicability, cost reduction, simple and convenient sealing. Effect

Active Publication Date: 2020-10-02
BEIJING MINING & METALLURGICAL TECH GRP CO LTD +1
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  • Claims
  • Application Information

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Problems solved by technology

[0005] However, this method only discusses the influence of process parameters in the gas atomization process on the preparation results in the preparation of alloy powders, but there are many factors that affect the yield of alloy powders within the target particle size range; and there are no such factors in the prior art. Propose relevant methods and guidance for the preparation of high yields of alloy powders with different median particle sizes, so that the yield of alloy powders within the particle size range of the target median particle size is not high

Method used

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  • Atomization spray disc and method for preparing narrow particle size alloy powder for additive manufacturing by gas atomization
  • Atomization spray disc and method for preparing narrow particle size alloy powder for additive manufacturing by gas atomization
  • Atomization spray disc and method for preparing narrow particle size alloy powder for additive manufacturing by gas atomization

Examples

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Embodiment 1

[0055] A method for preparing alloy powder with narrow particle size for additive manufacturing based on entropy reduction control, comprising the following steps:

[0056] (1) Alloy smelting: Put the GH4169 nickel-based alloy bar in the melting chamber for vacuum electrode induction melting. The melting temperature is 1520°C. By controlling the heating of the induction coil, the lower end of the bar is gradually melted to form a continuous and stable metal melt. The superheat of the melt is 200°C, and the flow rate of the alloy melt is 6kg / min.

[0057] (2) Atomized pulverization: According to the target particle size requirements of the alloy powder with a median particle size of 30 μm and a particle size distribution range of 15-53 μm for the selective laser melting technology, the annular seam atomization spray plate is selected, and the annular seam width is d 1 0.8mm, jet angle α 1 is 30°, and the center-to-center distance L at the lower end of the circular seam 1 14mm...

Embodiment 2-19

[0060] The difference between Examples 2-19 and Example 1 lies in the selection of alloy raw materials, different spray pans, different spray pan structural parameters and different atomization process parameters when preparing alloy powders. See Table 1 for details.

[0061] Equipment and process conditions for preparing alloy powders of table 1 embodiment 1-19

[0062]

[0063] Among them, the alloys used in Examples 1-2 and Examples 4-15 are commercially available; the superalloy melts are obtained by melting master alloy rods. The specific composition and ratio of the NiCrAlY alloy in embodiment 3 and embodiment 17 are: Ni is the balance, Cr: 23%, Al: 8%, Y: 0.8%; The FeNiCr alloy of embodiment 16 is the metal iron, nickel Raw materials such as chromium, niobium and the like are added into the melting crucible according to the alloy ratio and smelted to obtain the FeNiCr stainless steel alloy melt, the alloy composition ratio is: Ni: 3%, Cr: 16%, and Fe is the balance; ...

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Abstract

The invention discloses an atomization spray disc and a method for preparing narrow particle size alloy powder for additive manufacturing by gas atomization, and belongs to the field of powder preparation. The technical problem of low yield of preparation of narrow particle size alloy powder is solved. The atomization spray disc comprises a spray disc main body, a spray disc upper connecting bodyand a spray disc lower connecting body, wherein an annular seam is formed between the spray disc lower connecting body and the spray disc upper connecting body or an annular hole is formed in the spray disc upper connecting body. A method for preparing the narrow particle size alloy powder for additive manufacturing by gas atomization comprises the following steps that S1, fine particle size alloypowder with the median particle size of 60 micrometers or less is prepared by adopting an annular seam spray disc; coarse particle size alloy powder with the median particle size of 60 micrometers orabove is prepared by adopting an annular hole spray disc; S2, the parameters of the spray disc are determined; and S3, atomization technological parameters are determined. The method uses the atomization spray disc and has the advantages that the cost is low and the high-yield narrow particle size alloy powder is efficiently prepared.

Description

technical field [0001] The invention relates to the technical field of powder preparation, more specifically, it relates to an atomizing spray pan and a method for gas atomizing and preparing narrow-diameter alloy powder for additive manufacturing. Background technique [0002] With the continuous application of laser engineering net shaping, selective laser melting, cold spraying, laser cladding and other additive manufacturing processes in coal mines, automobiles, ships, aerospace and other fields, the demand for high-quality alloy powder materials is increasing. As the mainstream process of alloy powder preparation, the powder preparation volume of gas atomization process has reached 80% of the world's total powder production, and the proportion of some developed countries and regions is even larger. Gas atomization pulverization technology is a non-equilibrium and rapid process that uses high-pressure and high-speed gas to impact the molten metal flow, breaking the molte...

Claims

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Application Information

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IPC IPC(8): B22F9/08C22C19/05C22C38/40B22F1/00B33Y70/00
CPCB22F9/082C22C19/058C22C38/40B33Y70/00B22F2009/0824B22F2009/0888B22F1/05
Inventor 于月光杜开平沈婕皮自强郑兆然马尧胡宇陆在平
Owner BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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