CO3W3C Fishbone-Like Hard Phase-Reinforced Fe-Based Wear-Resistant Coating and Preparation Thereof

a technology of hard phase reinforcement and wear-resistant coating, which is applied in the field of material surface wear-resistant coating and preparation thereof, can solve the problems of particularly severe wear failure of mechanical parts, and achieve the effect of simple and convenient operation process

Inactive Publication Date: 2017-02-16
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0003]The present invention is aimed to provide an Co3W3C fish-bone-shape hard-phase reinforced Fe-based wear-resistant coating and preparation thereof, which has a simple and convenient operation process and a cladding layer that is uneasy to break off.

Problems solved by technology

During use of a mechanical part, most of the wear occurs on the surface part of a workpiece, and especially in a severe working environment, e.g., high corrosion, high friction, high temperature and high pressure and the like, the wear failure of the mechanical part is particularly severe.

Method used

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  • CO3W3C Fishbone-Like Hard Phase-Reinforced Fe-Based Wear-Resistant Coating and Preparation Thereof
  • CO3W3C Fishbone-Like Hard Phase-Reinforced Fe-Based Wear-Resistant Coating and Preparation Thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0026]The surface of the matrix is polished to remove oxide layer, the treated matrix is placed on a plasma cladding working table, and its position is adjusted.

[0027]The WC powder with granularity of 280-320 meshes and the Fe-based alloy powder of 100-200 meshes are screened to prepare the Fe-based WC mixed alloy powder including the following components in weight percentage: C: 3.24%, Cr: 7.2%, Ni: 4.4%, W: 49.56%, Co: 7.2%, Si: 0.04%, and the remaining is Fe. The powder is subjected to pre-treatment, put in a stirrer to stir for 50-60 min, put in a drying oven to heat at 150° C., and put in a powder feeder. The cladding process includes: A working current of 140 A, a working voltage of 11 V, powder feeding gas and protecting gas are argon gas, a powder feeding gas pressure of 300 MPa, a protecting gas pressure of 800 MPa, distance from a nozzle to the surface of the matrix is 10 mm, and a scanning speed of 80 mm / min. The plasma cladding machine is turned off after finishing the c...

example 2

[0030]The pre-treatment process of the matrix is kept the same as that of Example 1, and the prepared Fe-based WC mixed alloy powder includes the following components in weight percentage: C: 3.77%, Cr: 5.4%, Ni: 3.3%, W: 57.83%, Co: 8.4%, Si: 0.03%, and the remaining is Fe. The process parameters of the plasma cladding are the same as those of Example 1, and a cladding layer with a superior performance can be obtained.

[0031]Mutual-rubbing test is performed on the M-200 wear testing machine for the prepared Co3W3C fish-bone-shape hard-phase reinforced Fe-based wear-resistant coating with a wear time of 40 min, a wear amount of 0.0032 g and a very superior wear resistance. FIG. 1 is an XRD graph of the plasma cladding layer of Example 2, the Co3W3C in the cladding layer plays a big role in improving the performance thereof. In FIG. 4, it can be seen that a large amount of fish-bone-shape hard phase Co3W3C on a wear surface is embossed on the surface of the matrix.

example 3

[0032]The pre-treatment process of the matrix is kept the same as that of Example 1, and the prepared Fe-based WC mixed alloy powder includes the following components in weight percentage: C: 1.89%, Cr: 11.7%, Ni: 7.15%, W: 28.81%, Co: 4.2%, Si: 0.065%, and the remaining is Fe. The process parameters of the plasma cladding are the same as those of Example 1, and a cladding layer with a superior performance can be obtained.

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Abstract

A Co3W3C fishbone-like hard phase-reinforced Fe-based wear-resistant coating and the preparation thereof, which belongs to the field of a wear-resistant coating on the surface of a material and a preparation method thereof. The wear-resistant coating comprises: 1.89-3.77% of C, 5.4-11.7% of Cr, 3.3-7.15% of Ni, 28.81-57.83% of W, 4.2-8.4% of Co, 0.03-0.065% of Si and the balance of Fe. The preparation process of the wear-resistant coating comprises: (1) before plasma cladding, pretreating a matrix; (2) pretreating an iron-based alloy powder; and (3) adjusting the process parameters of plasma cladding, preparing a cladding layer with a predetermined width and a predetermined thickness, and naturally cooling same down in air. The wear-resistant coating is simple in process; the prepared cladding layer has a strong metallurgical bonding property with the matrix structure, so that the best performance matching between the ceramic phase of the cladding layer and the matrix can be achieved; a fishbone-like hard phase Co3W3C has a very high hardness value and plays the role of a framework in the frictional process to reduce the wear of the matrix structure, thereby achieving an excellent wear resistance; plasma cladding is convenient to operate, and can be automatized; and the prepared wear-resistant layer is high in size precision and can be widely applied to surface modification of mechanical parts.

Description

TECHNICAL FIELD[0001]The present invention relates to a material surface wear-resistant coating and preparation thereof, and particularly to a Co3W3C fish-bone-shape hard-phase reinforced Fe-based wear-resistant coating and method for preparing the same.BACKGROUND ART[0002]During use of a mechanical part, most of the wear occurs on the surface part of a workpiece, and especially in a severe working environment, e.g., high corrosion, high friction, high temperature and high pressure and the like, the wear failure of the mechanical part is particularly severe. Therefore, the surface of the mechanical part that has a friction pair is required to have high hardness and wear resistance during use. The surface engineering technology can make a wear-resistant coating with superior performance. The coating material is usually a composite material, and the reinforced phase mainly is carbide, boride and nitride with high hardness and wear resistance. Co3W3C fish-bone-shape hard phase does not...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C23C24/10C22C38/44B22F1/00C22C30/00C22C27/04C22C38/52C22C38/02
CPCC23C24/103C22C38/52C22C38/44C22C38/02B22F2302/45C22C27/04B22F1/0003B22F2302/10C22C30/00C22C37/08C22C37/10C22C38/105C22C38/12C22C38/56B22F1/00B23K10/027B32B15/013C22C1/1084C22C29/067C22C29/08B23K2103/04B23K2103/26C23C24/10B23K35/00
Inventor TAO, QINGWANG, JIANWANG, CONGLAI, WEILIU, JIANYANGGU, FANJUN
Owner CHINA UNIV OF MINING & TECH
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