A high-entropy alloy-based composite coating and its preparation method

Abstract

The invention relates to a composite coating and a preparation method thereof, in particular to a high-entropy alloy based composite coating and a preparation method thereof. A high-entropy alloy base of the high-entropy alloy based composite coating is AlCoNiCrFeCu, and the volume fraction of the high-entropy alloy base is 80-95%. The wild phase is SiC, and the volume fraction of the wild phase is 5-20%. The preparation method includes the steps that Ti powder, C powder and Cu powder are weighed and mixed; the above simple substance raw materials are subjected to ultrasonic cleaning with petroleum ether and absolute ethyl alcohol; the above simple substance raw materials are mixed and smelted, and mother alloy ingots are cooled along with a tungsten electrode magnetic control electric-arc furnace and then taken out; rodlike alloy obtained through spraying casting is a high-entropy alloy based composite electrode; and the continuous coating is obtained through connection and overlapping. The coating prepared in the invention has the characteristics of high hardness, high tenacity, high bonding strength, abrasion resistance, corrosion resistance and the like, and the raw materials are common raw materials which are wide in source and low in price.

Description

technical field [0001] The invention relates to a composite coating and a preparation method thereof, in particular to a SiC reinforced AlCoNiCrFeCu high-entropy alloy-based composite coating and a preparation method thereof. Background technique [0002] With the rapid development of modern science and technology, it is difficult for a single metal material to meet some special needs, and the rising composite materials play an important role in modern science and technology due to their many special properties and functions. At the same time, with the continuous development of surface technology, high-entropy alloy matrix composite coatings with excellent properties have gradually attracted people's attention. [0003] At present, the preparation methods that have been applied to high-entropy alloy-based composite coatings mainly include laser cladding and plasma cladding. Laser cladding requires a large laser, and the production cost is relatively high; at the same time, ...

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Problems solved by technology

Laser cladding requires a large laser, and the production cost is relatively high; at the same time, the temperature difference between the outer edge of the laser spot and the internal source of laser cladding is large, and the composite coating is formed unevenly; The choice of cladding material is relatively limited

In the process of preparing high-entropy alloy-based composite coatings by plasma cladding, the thickness distribution of alloy powder on the surface of the substrate is uneven, and the surface of the substrate will be partially exposed in a single cladding, and the substrate is not completely covered by the coating; At the same time, the spray gun is used to feed the powder, and the alloy powders of different densities will gradually separate during the process of moving to stop, resulting in uneven distribution of the components of the alloy powder on the surface of the substrate, which in turn leads to different properties of the prepared coating; The input heat of cladding is large, resulting in a large amount of thermal deformation of the substrate; the coating obtained after cladding has high porosity, poor density, and the coating is easy to fall off from the surface of the substrate; plasma cladding requires large-scale special equipment, and the preparation cost is high

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