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Manufacturing method of high entropy alloy coating layer

a manufacturing method and alloy technology, applied in the direction of molten spray coating, coating, metal material coating process, etc., can solve the problems of difficult control of the properties likely to form defects in the hea, etc., and achieve the effect of effective control of the hea coating layer properties

Inactive Publication Date: 2020-05-14
NAT TAIWAN UNIV OF SCI & TECH
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Benefits of technology

The present invention provides a manufacturing method for a HEA coating layer that can effectively control the properties of the coating. The method involves forming HEA powders using a gas atomization process, heating them to a semi-molten state, and spraying them onto a target substrate using a plasma spray process. This method results in the formation of HEA powders with a homogeneous crystalline phase, low impurity content, consistent shape, and great flowability. The rapid cooling of the molten HEA material during the gas atomization process maintains the low temperature crystalline phase, reducing likelihood of high temperature crystalline phase formation during the plasma spray process. The resulting coating layer is homogeneous and consists of low temperature crystalline phase, which can be further ensured through sieving of the HEA powders, controlling power and gas flow rate for generating the plasma, and cooling of the target substrate. The manufacturing method of the present invention can effectively control the crystalline phase of the coating layer, resulting in more precise adjustment of physical properties.

Problems solved by technology

However, defects are likely to form in HEA during the crushing process, and the heat generated by the crushing process may have an influence on material characteristics of HEA.
As such, properties of the HEA coating layer are difficult to be controlled.

Method used

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  • Manufacturing method of high entropy alloy coating layer
  • Manufacturing method of high entropy alloy coating layer
  • Manufacturing method of high entropy alloy coating layer

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Embodiment Construction

[0029]FIG. 1 is a schematic diagram illustrating a HEA coating layer manufacturing apparatus 10 according to some embodiments of the present invention. In some embodiments, a HEA coating layer CL may be formed on a target substrate TS by using the HEA coating layer manufacturing apparatus 10.

[0030]Referring to FIG. 1, the HEA coating layer manufacturing apparatus 10 may include a gas atomization apparatus 100. In some embodiments, the gas atomization apparatus 100 includes a melting part MP. A solid HEA material is fused in the melting part MP to form a molten HEA material. In some embodiments, a crucible C is disposed in the melting part MP. The solid HEA material may be placed in the crucible C, and is heated to form the molten HEA material by, for example, a manner of induction heating. At this time, a temperature of the molten HEA material may range from 1150° C. to 1500° C. In some embodiments, the melting part MP may be kept in a vacuum state while heating the HEA material. In...

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Abstract

A manufacturing method of a high entropy alloy (HEA) coating is provided. The manufacturing method of the HEA coating includes: melting a HEA material, wherein the HEA material comprises at least four metal elements, and the at least four elements are contained in the HEA material with substantially the same content; performing a gas atomization process on the molten HEA material to form HEA powders; and performing a plasma spray process to heat the HEA powders, and spray the heated HEA powders onto a target substrate.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the priority benefit of Taiwan application serial no. 107140163, filed on Nov. 13, 2018. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.BACKGROUNDTechnical Field[0002]The present invention is related to a manufacturing method of a coating layer, and more particularly, to a manufacturing method of a high entropy alloy (HEA) coating layer.Description of Related Art[0003]High entropy alloy (HEA) is an alloy material that contains four or more major elements. Each major element is contained in HEA with a high atomic percentage, but the atomic percentage of each major element in HEA is not greater than 35 at %. Accordingly, a high entropy effect resulted from the composition of HEA can be effectively generated. As a result of random distribution of different major elements, formation of brittle compound can be avoided. Therefore, HEA...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C23C4/073C23C4/134C23C4/123
CPCC23C4/134C23C4/073C23C4/123C23C4/04
Inventor CHEN, SHIH-HSUNCHENG, KUEI-CHUNG
Owner NAT TAIWAN UNIV OF SCI & TECH
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