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Preparation method of self-lubricating hard composite coating on surface of shield tunneling machine cutter

A shield machine tool and composite coating technology, which is applied in coating, metal material coating process, etc., can solve the problems of loose coating-substrate bonding, complicated process, unpublished self-lubricating tool hardness and friction factor, etc. parameters and other issues

Active Publication Date: 2021-11-02
CHINA UNIV OF MINING & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The patent with the publication number CN110205624A discloses a laminated hard-coated self-lubricating tool and its preparation method. The method is to sequentially prepare a hard alloy layer, an alumina ceramic layer and a cubic nitride layer on the surface of high-speed steel by laser cladding. boron layer, but in this method there is the disadvantage that the coating-substrate is not tightly bonded, and the performance parameters such as hardness and friction factor of the self-lubricating tool are not disclosed; the patent with the publication number of CN103522652A discloses a laser cladding soft-hard composite A method for preparing a coated self-lubricating tool, which uses laser cladding to clad MoS on the rake face of the tool 2 or WS 2 Self-lubricating soft coating with Nano A 2 o 3 Composite coatings of hard coatings such as ceramics or ultra-fine cemented carbide, but MoS 2 and WS 2 High temperature is easy to decompose, the tool is not suitable for high temperature environment; the patent with publication number CN105925941A discloses TiAlCrN+MoS 2 / Ti / Al / Cr combined lubricating coating tool and its preparation process, the method uses arc ion plating and unbalanced magnetron sputtering to composite deposit TiAlCrN+MoS on high speed steel 2 / Ti / Al / Cr coating, but this method has high cost and complicated process and can only reduce 20-25% of tool wear, and its wear-reducing effect is poor
The above technologies have problems such as poor coating-substrate bonding, poor high temperature resistance, and complicated processes.

Method used

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  • Preparation method of self-lubricating hard composite coating on surface of shield tunneling machine cutter
  • Preparation method of self-lubricating hard composite coating on surface of shield tunneling machine cutter
  • Preparation method of self-lubricating hard composite coating on surface of shield tunneling machine cutter

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Embodiment 1

[0024] A method for preparing a self-lubricating hard composite coating on the surface of a shield machine tool. The tool matrix material is T-4241 high-speed steel, which is composed of the following components by mass fraction: 0.9-1% C, 1.5-2.5% W, 3.8- 4.4% Cr, 0.5-1.2% Mo, 0.2-0.4% Mn, 0.5-1% Si, and the rest of Fe; specifically including the following steps:

[0025] (1) Use 80~1200 # Grind the surface of the tool base with sandpaper, clean it with alcohol, and then quench and temper it after cleaning;

[0026] (2) Preparation of NiCoCrAlY alloy powder: the alloy powder is obtained by mixing and ball milling and drying the raw materials of the following mass fractions: 23% of Co powder, 17% of Cr powder, 12% of Al powder, 0.5% of Y powder, and Ni powder of the remainder; Preparation of WC-TiC-NbC-Co-Ti 3 AlC 2 Alloy powder, which is obtained by mixing ball milling and drying the following raw materials in mass fraction: WC powder 78.5%, TiC powder 5.6%, NbC powder 3.7...

Embodiment 2

[0035] A method for preparing a self-lubricating hard composite coating on the surface of a shield machine tool. The tool matrix material is T-4241 high-speed steel, which is composed of the following components by mass fraction: 0.9-1% C, 1.5-2.5% W, 3.8- 4.4% Cr, 0.5-1.2% Mo, 0.2-0.4% Mn, 0.5-1% Si, and the rest of Fe; specifically including the following steps:

[0036] (1) Preparation of NiCoCrAlY alloy powder: the alloy powder is obtained by mixing and ball milling and drying the raw materials of the following mass fractions: 22% of Co powder, 18% of Cr powder, 11.5% of Al powder, 0.6% of Y powder, and Ni powder of the remainder; Preparation of WC-TiC-NbC-Co-Ti 3 AlC 2 Alloy powder, which is obtained by mixing ball milling and drying the following raw materials in mass fraction: WC powder 78%, TiC powder 5.1%, NbC powder 3.6%, Ti 3 AlC 2 powder 6.2%, the balance of Co powder; the particle size of the two alloy powders is 50-100 μm; the two alloy powders are mixed evenl...

Embodiment 3

[0044] A method for preparing a self-lubricating hard composite coating on the surface of a shield machine tool, wherein the tool base material is high-speed steel, specifically includes the following steps:

[0045] (1) Use 80~1200 # Grind the surface of the tool base with sandpaper, clean it with alcohol, and then quench and temper it after cleaning;

[0046] (2) Preparation of NiCoCrAlY alloy powder: the alloy powder is obtained by mixing and ball milling and drying the raw materials of the following mass fractions: 24% Co powder, 16% Cr powder, 12.5% ​​Al powder, 0.4% Y powder, and Ni powder in the remainder; Preparation of WC-TiC-NbC-Co-Ti 3 AlC 2 Alloy powder, which is obtained by mixing ball milling and drying the following raw materials in mass fraction: WC powder 79%, TiC powder 5.3%, NbC powder 3.5%, Ti 3 AlC 2 Co powder 6.3%, the balance of Co powder; the particle size of the two alloy powders are both 50 ~ 100μm;

[0047] (3) Laser cladding is carried out on a...

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Abstract

The invention discloses a preparation method of a self-lubricating hard composite coating on the surface of a shield tunneling machine cutter. According to the preparation method of the self-lubricating hard composite coating on the surface of the shield tunneling machine cutter, a cutter base body is made of high-speed steel, and a NiCoCrAlY adhesion layer and a WC-TiC-NbC-Co-Ti3AlC2 coating are sequentially prepared on the surface of the cutter base body through laser cladding. The WC-TiC-NbC-Co-Ti3AlC2 coating prepared through the method is free of cracks and forms good metallurgical bonding with the base body, and the NiCoCrAlY adhesion layer has a good adhesion effect. In a WC-TiC-NbC-Co-Ti3AlC2 system, WC, TiC and NbC are all hard phases, so that the coating has high hardness, Co plays a role in connecting the hard phases, Ti3AlC2 has good self-lubricating performance, and the friction factor of the coating is greatly reduced. The coating has high hardness and good wear resistance, the cutting capacity of the shield tunneling machine cutter is greatly improved, and the service life of the cutter is prolonged.

Description

technical field [0001] The invention belongs to the technical field of coatings, in particular to a method for preparing a self-lubricating hard composite coating on the surface of a shield machine tool. Background technique [0002] In recent years, the shield machine has been widely used in urban tunnel excavation, but the tool wear of the shield machine is serious when it works in the sand and pebble stratum. The shield machine has to open the warehouse frequently to change the tool during construction, which increases the construction cost and reduces the working efficiency of the shield machine. Therefore, it is of great significance to improve the wear resistance of the shield machine tool. [0003] Using laser cladding to prepare a hard tool coating on the surface of high-speed steel can make the tool hard on the outside and tough on the inside. It can not only improve the hardness and wear resistance of the tool, but also have high impact toughness and bending streng...

Claims

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Application Information

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IPC IPC(8): C23C24/10C22C29/08C22C19/05C22C30/00C22C38/22C22C38/04C22C38/02
CPCC23C24/106C23C24/103C22C29/08C22C19/058C22C30/00C22C38/22C22C38/04C22C38/02
Inventor 周嘉利程延海韩正铜杨金勇王情情陈浩韩忠臣
Owner CHINA UNIV OF MINING & TECH
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