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High-roughness reproducible high-friction coefficient wear-resistant coating and preparing method thereof

A high friction coefficient, wear-resistant coating technology, applied in the direction of coating, metal material coating technology, metal processing equipment, etc., can solve the problems of low surface roughness and reduced surface friction coefficient, achieve high friction coefficient, improve Long service life, high roughness effect

Active Publication Date: 2019-11-12
XI AN JIAOTONG UNIV
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Problems solved by technology

[0005] In order to overcome the shortcomings of the above-mentioned prior art, the object of the present invention is to provide a high-roughness reproducible high friction coefficient wear-resistant coating and its preparation method, which can make the wear-resistant coating not only have excellent wear resistance, Moreover, the surface roughness and surface friction coefficient do not change with time during the friction and wear process, ensuring a long service life, thus effectively solving the problem of low surface roughness and decreasing surface friction coefficient of traditional wear-resistant coatings

Method used

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  • High-roughness reproducible high-friction coefficient wear-resistant coating and preparing method thereof
  • High-roughness reproducible high-friction coefficient wear-resistant coating and preparing method thereof
  • High-roughness reproducible high-friction coefficient wear-resistant coating and preparing method thereof

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preparation example Construction

[0034] The preparation method of the high-roughness and reproducible wear-resistant coating with high friction coefficient disclosed in the present invention includes the following steps:

[0035] 1) Using a mechanical alloying method or a hydrothermal reduction method to prepare a hard core-shell structured composite powder of metal-coated cermet particles, wherein the metal in the coating layer is the same or similar to the metal in the coated cermet Thermophysical properties, the coated cermet is a hard wear-resistant cermet composed of a metal phase firmly bonding ceramic particles together;

[0036] 2) Using thermal spraying method to heat the metal-coated core-shell structure powder to a state where the metal phase of the coating layer is completely melted or nearly completely melted to form semi-molten particles with hardly melted core particles of the coated hard cermet and collide After the substrate is sprayed and deposited on the surface of the metal substrate, a wear-re...

Embodiment 1

[0046] Step 1: Use Ni with an average particle size of 0.2-0.6 μm as the raw material for the metal coating layer, and 30-100 μm WC-12Co as the coated carbide particles. The stainless steel with a diameter of 3mm was used as the ball milling medium, the ball-to-material ratio was 10:1-15:1, and Ar was used as a shielding gas. The ball milled for 3 hours to prepare Ni(WC-12Co) coated powder with a core-shell structure. The mass fraction of the coating layer is 30%-45%.

[0047] Step 2: Using 316L stainless steel as the substrate, the coating is prepared by atmospheric plasma spraying, the coating layer Ni is melted and part of the Co in the WC-12Co melts to form semi-molten particles, and the coating is deposited. Ni is used as the metal bonding phase and filling phase to bond spherical and nearly spherical WC-12Co particles together to form a dense coating, which is a wear-resistant coating with high roughness and renewable high friction coefficient.

[0048] figure 2 Shown is a ...

Embodiment 2

[0053] Step 1: Use NiCo with an average particle size of 0.4-0.7 μm as the raw material for the metal coating layer, and 30-100 μm WC-5Co as the cemented carbide particles. The 3mm diameter stainless steel was used as the ball milling medium, the ball-to-material ratio was 10:1-15:1, and Ar was used as the protective gas. The ball milled for 3 hours to prepare NiCo (WC-12Co) coated powder with a core-shell structure. The mass fraction of the coating layer is 30%-40%.

[0054] Step two, using high chromium martensitic stainless steel as a substrate, the coating is prepared by atmospheric plasma spraying, the coating layer NiCo is melted and WC-12Co is partially melted to form semi-molten particles, and the coating is deposited. NiCo is used as the metal bonding phase and filling phase to bond spherical and nearly spherical WC-12Co particles together to form a dense coating.

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Abstract

The invention discloses a high-roughness reproducible high-friction coefficient wear-resistant coating and a preparing method thereof. 1) metal is used as a coating material, metal ceramic particles are used as a coated material, and the metal ceramic particles are coated with the metal to prepare a spraying powder raw material, wherein the metal as the coating material is the same as the metal used for the metal ceramic particles as the coated material or is similar with the metal used for the metal ceramic particles as the coated material in thermophysical characteristic; and 2) a heat spraying method is adopted to heat the spraying powder raw material prepared in the step 1) until the state that the metal as the coating material is completely melted or nearly completely melted is obtained, semi-molten particles with cores of the metal ceramic particles of the coated material not melted are formed, and the semi-molten particles collide a metal substrate to be sprayed and deposited onthe surface of the metal substrate to form a metal ceramic coating, namely the high-roughness reproducible high-friction coefficient wear-resistant coating. A new method is provided for preparing thehigh-performance long-life high-roughness reproducible metal-based wear-resistant coating.

Description

Technical field [0001] The invention belongs to the technical field of material processing, and relates to a preparation method of a wear-resistant coating, in particular to a high-roughness reproducible wear-resistant coating with a high friction coefficient and a preparation method thereof. Background technique [0002] Wear-resistant coatings are widely used in modern industrial and military fields such as petrochemicals, aerospace, ships, etc., and are an important method to improve the surface wear resistance of metal material components and improve product quality and life. A cermet composite coating composed of a hard ceramic phase and a metal phase with good plasticity and toughness is currently the most widely used wear-resistant coating system. Take the most representative WC-Co cemented carbide coating as an example. This coating not only has high hardness and wear resistance, but also has a certain degree of toughness. It is an excellent commonly used wear-resistant c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F1/00C23C4/06C23C4/12C22C29/08C22C29/06
CPCB22F1/0007C23C4/06C23C4/12C22C29/067C22C29/08C22C29/06B22F1/17
Inventor 李长久张山林王雅婷雒晓涛李成新杨冠军
Owner XI AN JIAOTONG UNIV
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