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Preparation method of superhard boron carbide ceramic reinforced iron-based alloy composite wear-resistant coating

A technology of boron carbide ceramics and iron-based alloys, applied in the field of materials, can solve the problems of large residual stress and low bonding strength

Active Publication Date: 2021-04-27
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing a superhard boron carbide ceramic reinforced iron-based alloy composite wear-resistant coating. The vacuum cladding method is used to prepare the composite wear-resistant coating, which overcomes methods such as thermal spraying and laser cladding. The composite coating has defects such as low bonding strength and large residual stress. At the same time, the boron carbide superhard ceramic phase is introduced as a reinforcing phase. Composite coatings composed of eutectic compounds (chromium-rich and iron-rich carborides), in which the formed iron-nickel solid solution is used as the coating matrix, for undecomposed boron carbide, newly formed chromium-rich and iron-rich carborides The hard phase has a certain bonding and supporting effect, so that the hard phase is not easy to fall off during the wear process, protects the grinding surface, and greatly improves the wear resistance of the coating

Method used

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  • Preparation method of superhard boron carbide ceramic reinforced iron-based alloy composite wear-resistant coating
  • Preparation method of superhard boron carbide ceramic reinforced iron-based alloy composite wear-resistant coating
  • Preparation method of superhard boron carbide ceramic reinforced iron-based alloy composite wear-resistant coating

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Process such as figure 1 shown;

[0045] Prepare boron carbide ceramic particles and iron-based self-fluxing alloy powder as raw materials; the particle size of boron carbide ceramic particles is 10-40 μm, and the particle size of iron-based alloy powder is 40-100 μm; the iron-based self-fluxing alloy is FeCrBSi (Fe60) molten alloy;

[0046] Prepare the 45# steel matrix that has been surface treated to form the surface to be clad, with a size of 60mm×60mm×10mm;

[0047] Put boron carbide ceramic particles and iron-based alloy powder into a ball mill for dry ball milling and mixing. The ball-to-material ratio during ball milling and mixing is 2, the ball milling mixing time is 6 hours, and the ball milling speed is 300rpm to obtain a mixed powder; the boron carbide ceramic particles are mixed during ball milling. The mass accounts for 10% of the total mass of boron carbide ceramic particles and iron-based alloy powder;

[0048] Add a binder to the mixed powder and sti...

Embodiment 2

[0054] Method is with embodiment 1, and difference is:

[0055] (1) The iron-based self-fluxing alloy is a Fe-Cr-C alloy;

[0056] (2) The substrate is 304 stainless steel substrate, the size

[0057] (3) The ball-to-material ratio during ball milling is 3, the time is 3h, and the rotating speed is 500rpm; the quality of boron carbide ceramic particles accounts for 20% of the total mass of boron carbide ceramic particles and iron-based alloy powder;

[0058] (4) The thickness of the prefabricated coating is 2 mm; the binder is absolute ethanol;

[0059] (5) During vacuum cladding, first raise the temperature to 400°C and keep it warm for 30 minutes; then raise the temperature to the melting point of iron-based alloy powder and keep it warm for 50 minutes;

[0060] The microhardness of the iron-based alloy composite wear-resistant coating reinforced by boron carbide ceramic particles is 500-1300HV.

Embodiment 3

[0062] Method is with embodiment 1, and difference is:

[0063] (1) The ball-to-material ratio during ball milling is 2.5, the time is 4h, and the rotating speed is 400rpm; the quality of boron carbide ceramic particles accounts for 5% of the total mass of boron carbide ceramic particles and iron-based alloy powder;

[0064] (2) The thickness of the prefabricated coating is 3mm; the binder is water glass;

[0065] (3) During vacuum cladding, first raise the temperature to 350°C and keep it warm for 40 minutes; then raise the temperature to the melting point of iron-based alloy powder and keep it warm for 40 minutes;

[0066] The microhardness of the iron-based alloy composite wear-resistant coating reinforced by boron carbide ceramic particles is 500-1300HV.

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Abstract

The invention relates to a preparation method of a superhard boron carbide ceramic reinforced iron-based alloy composite wear-resistant coating. The preparation method comprises the following steps: (1) preparing boron carbide ceramic particles and iron-based self-fluxing alloy powder as raw materials; (2) preparing a steel substrate of which the surface is treated to form a surface to be cladded; (3) putting the boron carbide ceramic particles and the iron-based alloy powder into a ball mill for dry ball milling and mixing; (4) adding a binder into the mixed powder, uniformly stirring to form viscous paste, and coating the surface of the steel substrate with the viscous paste; (5) drying after air drying; and (6) carrying out vacuum cladding and then carrying out furnace cooling. The coating prepared by the method provided by the invention has no cracks and micropores penetrating through the whole thickness, is a continuous closed coating, and can significantly improve the wear resistance of mechanical parts, prolong the service life and improve the safety performance.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method of a superhard boron carbide ceramic reinforced iron-based alloy composite wear-resistant coating. Background technique [0002] More than 50% of the annual consumption of steel materials in the world is due to wear and corrosion, and 1 / 3 of the total energy is consumed in friction. Friction leads to the conversion of mechanical energy into internal energy and wear, which leads to failure of parts and causes Huge economic loss; therefore, improving the wear resistance of the material surface has significant social and economic benefits. Surface modification technology has become the focus of research in recent years, including surface heat treatment technology, surface alloying technology and surface coating technology; however, the degree of surface strengthening of surface heat treatment and surface alloying technology is limited. The surface...

Claims

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Application Information

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IPC IPC(8): C23C24/10B22F7/04
CPCC23C24/103B22F7/04B22F2007/047
Inventor 余焕骆宗安冯莹莹谢广明王明坤沈威
Owner NORTHEASTERN UNIV
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