Gradient coating tool and its preparation method

A gradient coating and cutting tool technology, which is applied in the coating, metal material coating process, etc., can solve the problems that the toughness of the cutting tool coating needs to be further improved, the bonding strength between coatings is low, and the brittleness of ceramic cutting tools is large, and achieve good Effects of thermal stability and wear resistance, high hardness, and good toughness

Active Publication Date: 2019-08-20
SOUTHEAST UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

However, the thickness of the coating prepared by the above method is limited, and the bonding strength between the coatings is low
The Chinese invention patent with the application number 03112232.9 discloses a gradient functional ceramic cutting tool material and its preparation method. The gradient functional ceramic cutting tool material has a symmetrical bidirectional composition distribution structure, but the ceramic cutting tool itself has the disadvantage of high brittleness.
The Chinese invention patent with the application number 201710541381.8 discloses a laser cladding graphene-ceramic self-lubricating coating tool and its preparation method. The rake face of the tool is a graphene-ceramic self-lubricating coating, which can realize the self-lubricating function, but the tool coating toughness needs to be further improved

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  • Gradient coating tool and its preparation method

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Embodiment 1

[0022] Example 1: The gradient coating tool adopts a laser cladding method and is prepared on the rake face of the tool. The specific preparation steps are:

[0023] (1) Pre-treatment: Put the tool in an alcohol and acetone solution for 30 minutes ultrasonic cleaning, and then carry out degreasing treatment;

[0024] (2) Cladding hard alloy layer: MoS 2 , BN and LaF 3 The powder is added to the cemented carbide mixed powder to configure the mixed powder. The weight percentages of its main components are: 80% WC, 8% TiC, 6% Co, 1% TaC, 2% MoS 2 , 1% BN, 2% LaF 3 , The total weight percentage of each material is 100%; put the prepared cemented carbide mixed powder into the powder feeder, and adjust the powder feeder rate to 20g / cm 3 ; Using CO with a wavelength of 10.6μm 2 The laser cladding the cemented carbide mixed powder on the rake face of the tool. The laser cladding adopts the synchronous powder feeding method. Both the powder feeding gas and the shielding gas adopt argon gas; t...

Embodiment 2

[0028] Embodiment 2: The preparation method of the gradient coating tool in this embodiment adopts the laser cladding method to prepare the rake face of the tool. The difference from embodiment 1 is that the weight percentage of the material components in steps (2) and (3) , The thickness of the coating and the laser processing parameters are different from those of Example 1, and the thickness of the gradient coating in step (4) is different from that of Example 1. The specific preparation steps of the tool are as follows:

[0029] (1) Pre-treatment: Put the tool in an alcohol and acetone solution for 30 minutes ultrasonic cleaning, and then carry out degreasing treatment;

[0030] (2) Cladding hard alloy layer: MoS 2 , BN and LaF 3 The powder is added to the cemented carbide mixed powder to configure the mixed powder. The weight percentages of its main components are: 65% WC, 15% TiC, 10% Co, 2% TaC, 3% MoS 2 , 2% BN, 3% LaF 3 , The weight percentage of each material is 100%; put...

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Abstract

The invention discloses a gradient coating cutter and a preparation method thereof. A basal body material of the gradient coating cutter is high-speed steel; a multilayer coating layer is arranged onthe surface of a basal body; and the coating layer is a gradient laminated coating layer of alternating hard alloy layers, added with MoS2, BN and LaF3, and Al2O3 base ceramic layers. The cutter coating layer is prepared by adopting a laser cladding method; and the preparation steps are (1) pretreatment, (2) cladding of the hard alloy layers, (3) cladding of the Al2O3 base ceramic layers, (4) alternate cladding of the hard alloy layers and the Al2O3 base ceramic layers, and (5) aftertreatment. Compared with the prior art, the gradient coating layer on the surface of a cutter has the characteristics of Al2O3 base ceramic and hard alloys, and achieves higher hardness and excellent toughness; and through adding of MoS2, BN and LaF3, the cutter achieves excellent self-lubrication effect in wider cutting temperature range. The coating cutter can be applied to dry cutting and cutting of difficultly machined materials.

Description

Technical field [0001] The invention relates to the field of mechanical cutting tool manufacturing, in particular to a gradient coating tool and a preparation method thereof. Background technique [0002] Due to the high cost of cutting fluid and environmental pollution, dry cutting processing has become a research hotspot in green processing. However, during high-speed dry cutting, the friction between the tool and the chips on the rake face is extremely intense, which generates a lot of heat, which leads to rapid wear of the tool. Therefore, there is an urgent need to research and develop new tools that are pollution-free, efficient, and have high hardness and high wear resistance to reduce friction and increase tool life. [0003] At present, cutting tool materials widely used at home and abroad mainly include high-speed steel, cemented carbide, ceramic and diamond tools. Among them, high-speed steel has poor thermal conductivity, low hardness, and poor wear resistance, and is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10
Inventor 邢佑强王孟雅李想胡若愚黄开靓
Owner SOUTHEAST UNIV
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