Preparation method of high-entropy alloy coating layer on surface of casting

Abstract

The invention discloses a preparation method of a high-entropy alloy coating layer on a surface of a casting. The preparation method comprises the following steps: (S1) preparation of a prefabricated body: adhesive is added in raw material powder of the high-entropy alloy coating layer for mixing to form paste; the paste is pressed as a cylindrical prefabricated body; and the prefabricated body is dried; (S2) shaping: sand is used for manufacturing a molding cavity of a sand mold; after the sand mold is cured, a groove is formed in the specific part of a molding cavity wall part; and the prefabricated body in the step (S1) is put in the groove; and (S3) pouring: molten metal is poured in the molding cavity under normal temperature and normal pressure; and the prefabricated body is dissolved and dispersed under the heat effect of the molten metal, and is solidified to form the high-entropy alloy coating layer on the surface of the casting. After the step (S3), the high-entropy alloy coating layer is subsequently heated. The prepared high-entropy alloy coating layer is excellent in density, better in metallurgic bonding degree with a basal body, simple in needed equipment, convenient for operation and low in production cost.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for preparing a high-entropy alloy coating on the surface of a casting. Background technique [0002] Wear and tear is one of the main reasons for the failure of mechanical parts, which has a great impact on the service life and reliability of mechanical parts, which will cause a lot of economic losses and hinder the development of industry. With the rapid development of the economy, various sectors of the national economy have continuously improved the performance requirements of mechanical equipment, research and development of wear-resistant materials with better performance and reduce production costs, simplifying the process is still an important problem that material workers need to solve. [0003] The high-entropy alloy is composed of 5 to 13 alloying elements, and the content of each element is 5% to 35% atomically. The existence of ...

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Problems solved by technology

The patent application of Chinese patent document CN201310300255.5 discloses the alloy powder used to prepare the high-entropy alloy coating and its preparation method and application, but it does not pay attention to the possible burning of elements during the laser cladding process, and finally it is difficult to Forming a true high-entropy alloy coating and laser cladding requires a large laser, which increases production costs

Although the magnetron sputtering technology can better control the composition of the alloy coating, it has high requirements on the substrate and target, and it is difficult to achieve large-scale production

Plasma cladding also coats high-entropy alloy powder on the surface of the substrate, melts it with a plasma beam, and obtains a high-entropy alloy coating after rapid cooling. The high-entropy alloy coating is prone to defects such as cracks, low hardness, and uneven tissue distribution. At the same time, the plasma equipment is expensive, which greatly increases the production cost.

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