High-entropy alloy composite large-particle tungsten carbide composite coating as well as preparation method and application thereof

A high-entropy alloy and composite coating technology, which is applied in the coating process and coating of metal materials, can solve the problems of reduced self-corrosion potential, reduced comprehensive mechanical properties, and high cost of cobalt, and achieves increased coating hardness, The effect of shortening the contact time and controlling the alloy composition

A high-entropy alloy and composite coating technology, which is applied in the coating process and coating of metal materials, can solve the problems of reduced self-corrosion potential, reduced comprehensive mechanical properties, and high cost of cobalt, and achieves increased coating hardness, The effect of shortening the contact time and controlling the alloy composition

CN110331398AActive Publication Date: 2019-10-15CENT SOUTH UNIV
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  • High-entropy alloy composite large-particle tungsten carbide composite coating as well as preparation method and application thereof
  • High-entropy alloy composite large-particle tungsten carbide composite coating as well as preparation method and application thereof
  • High-entropy alloy composite large-particle tungsten carbide composite coating as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 2

[0069] This embodiment includes the following steps:

[0070] (1) Select a commercially available elemental metal with a purity higher than 99.5% (mass percentage), weigh it with a molar ratio of Fe:Co:Cr:Ni=1:1:1:1, and use the smelting-gas atomization process Prepared into multi-principal alloy powder;

[0071] (2) According to the mass ratio of multi-principal alloy powder: WC particle = 4:1, weigh WC particles with a particle size between 75 and 125 μm and mix them with the ball-milled multi-principal alloy powder and preheat them. In the silo of the laser cladding equipment, the rust-removed and polished 42CrMo stainless steel surface is clad. The process parameters of laser cladding are: laser power P=1000w, v=4~15mm / s, spot diameter D is 4.5mm, protective gas flow rate is 10L / min. Finally, a multi-principal alloy / tungsten carbide composite coating (thickness is about 2 mm) is obtained.

[0072] In this example, the large-grain tungsten carbide is evenly distributed i...

Embodiment 3

[0074] The steps of this example are basically the same as those of Example 1, the only difference is that in step (1), the atomized powder is crushed to obtain irregular WC particles, which are used as tungsten carbide raw materials for cladding.

[0075] In this embodiment series, the tungsten carbide with large particles and irregular morphology is retained in the FeCoCrNi binder, and is closely combined with the binder; when the multi-principal alloy powder: WC particle=2:3 (mass ratio), the composite The average microhardness of the coating is about 698HV 0.2 , the volume wear rate is 0.154×10 ～5 mm 3 / (N·m), indicating that the high-entropy alloy / large particle tungsten carbide coating prepared by the present invention has good hardness and wear resistance.

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Abstract

The invention belongs to the field of preparation of special composite coatings, and particularly relates to a high-entropy alloy composite large-particle tungsten carbide composite coating as well asa preparation method and application thereof. The composite coating is composed of a high-entropy alloy and tungsten carbide, wherein the tungsten carbide contains large-particle tungsten carbide, and the particle size of the large-particle tungsten carbide is 75-150 microns. The preparation method comprises the steps that high-entropy alloy powder and the large-particle tungsten carbide are prepared according to a set proportion; and the high-entropy alloy / the large-particle tungsten carbide is prepared through a laser cladding and rapid cooling method. The preparation process of the high-entropy alloy composite large-particle tungsten carbide composite coating is adopted, the high-entropy alloy / the large-particle tungsten carbide composite coating is prepared while protection matrices and the large-particle tungsten carbide are not damaged, so that the uniform distribution of the large-particle tungsten carbide particles in the composite coating is achieved, and various types of large-particle tungsten carbide particles and various types of laser cladding equipment are suitable.

Description

technical field [0001] The invention belongs to the field of preparation of special composite coatings, and relates to a high-entropy alloy / large-particle tungsten carbide composite coating with evenly distributed large-particle WC and a preparation method and application thereof. Background technique [0002] Cast iron brake discs are the most commonly used materials in motor vehicle and rail transit braking systems. Cast iron brake discs have good friction performance, strong wear resistance and heat resistance, can resist heat cracks, resist deformation, and have good castability. However, the cast iron brake disc has low strength and generally can only withstand the braking capacity below 350 °C. And because the brake disc is exposed to the outside for a long time during use, the working environment is relatively harsh, and the temperature difference of the brake disc is relatively large. If the vehicle is parked for a long time or in a humid environment, some rust wil...

Claims

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Application Information

Patent Timeline
15 Oct 2019
Publication
CN110331398A
IPC
C23C24/10; C22C29/08; C22C32/00; C22C30/00
CPC
C23C24/103; C22C29/08; C22C29/067; C22C29/005; C22C32/0052; C22C30/00
Inventors
张伟; 张明阳