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Gradient ceramic coating micro-texture self-lubricating tool and preparation method thereof

A technology of ceramic coating and micro-texture, applied in coating, metal material coating process, plating of superimposed layers, etc., can solve the problem of high brittleness of ceramic tools, difficulty in preparing micro-protrusion texture, coating and substrate. Bonding strength needs to be improved

Active Publication Date: 2021-05-11
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the micro-texture on the surface of the tool is mainly composed of micro-pit, micro-groove, etc., and the preparation of micro-protrusion texture is relatively difficult; at the same time, there are few studies on the preparation of micro-protrusion texture on the surface of ceramics.
[0004] The Chinese patent "Application No.: 200910014460.9" reports a silicon nitride-based nanocomposite gradient functional ceramic tool material and its preparation method. The ceramic tool material has a five-layer symmetrical gradient hierarchical structure, which makes the mechanical properties of the tool material change gradually. It can effectively relieve the residual thermal stress; but the ceramic tool itself has the disadvantage of high brittleness
Chinese patent "Application No.: 201710541381.8" reports a laser cladding graphene-ceramic self-lubricating coating tool and its preparation method. The tool has good overall toughness and self-lubricating effect, but the tool coating toughness still needs to be improved. improve
Chinese patent "Application No.: 201710223343.8" reports a preparation method of TiCN ceramic coating. The ceramic coating of the present invention is prepared by reactive plasma spraying method, and the bonding strength between the coating and the substrate still needs to be improved.

Method used

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  • Gradient ceramic coating micro-texture self-lubricating tool and preparation method thereof
  • Gradient ceramic coating micro-texture self-lubricating tool and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0035] A self-lubricating tool with a gradient ceramic coating micro-texture, the material of the tool base 1 is high-speed steel, and the surface of the base 1 is added with graphene and MoS 2 and CaF 2 Silicon nitride based ceramic layer 2 with added graphene, MoS2 and CaF 2 cermet layer 3 alternating gradient laminated coating; the surface of the coating has a micro-protrusion texture 4, and the micro-protrusion texture morphology is a grid-like micro-protrusion texture 5, an annular micro-protrusion texture 6 or Pit-shaped micro-protrusion texture 7.

[0036] Both the composite coating on the surface of the tool and the micro-protrusion texture 4 of the present invention are prepared on the rake face of the tool by electron beam cladding, and the specific preparation steps are:

[0037] (1) Pre-treatment: put the tool in alcohol and acetone solutions for 20 minutes and ultrasonically clean it for degreasing treatment.

[0038] (2) cladding silicon nitride based ceramic ...

Embodiment 2

[0053] A gradient ceramic coating micro-texture self-lubricating tool, the material of the tool substrate 1 is cemented carbide, and the surface of the substrate 1 is added with graphene and MoS 2 and CaF 2 The alumina-based ceramic layer 2 with the addition of graphene, MoS 2 and CaF 2 The cermet layer 3 alternate gradient laminated coating; the surface of the composite coating has a micro-protrusion texture 4, and the micro-protrusion texture morphology is a grid-like micro-protrusion texture 5, and an annular micro-protrusion texture 6 Or pit-like micro-protrusion texture 7 .

[0054] Both the composite coating on the surface of the tool and the micro-protrusion texture 4 of the present invention are prepared on the rake face of the tool by electron beam cladding, and the specific preparation steps are:

[0055] (1) Pretreatment: Place the tool in alcohol and acetone solutions for 30 minutes to ultrasonically clean it for degreasing treatment.

[0056] (2) Cladding alum...

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Abstract

The invention discloses a gradient ceramic coating micro-texture self-lubricating tool and a preparation method thereof. The base material of the tool is high-speed steel or hard alloy, and the surface of the base has a composite coating, and the coating is added graphene, MoS 2 and CaF 2 Silicon nitride-based or alumina-based ceramic layers with added graphene, MoS 2 and CaF 2 Alternating gradient coating of cermet layers, and the surface of the coating has a micro-protrusion texture. Both the surface coating of the tool and the micro-protrusion texture of the present invention are prepared by electron beam cladding, and the preparation steps include: (1) pretreatment; (2) cladding a silicon nitride-based or alumina-based ceramic layer; (3) ) cladding a cermet layer; (4) repeating steps (2) and (3), alternately cladding a silicon nitride-based or alumina-based ceramic layer and a cermet layer; (5) cladding a micro-raised texture; ( 6) post-processing. The tool has good overall toughness, high surface hardness and self-lubricating effect, high bonding strength between the coating and the substrate, and high coating preparation efficiency.

Description

technical field [0001] The invention relates to the field of mechanical cutting tool manufacturing, in particular to a gradient ceramic coating micro-texture self-lubricating tool and a preparation method thereof. Background technique [0002] Silicon nitride-based or alumina-based ceramic tool materials are widely used for cutting difficult-to-machine materials due to their high hardness, high wear resistance, excellent high-temperature mechanical properties and chemical stability, but the overall toughness of the tool is insufficient; Cermets have high toughness and strength, but their toughness and hardness appear in opposite forms, and ceramic knives are mainly prepared by powder metallurgy, and the preparation process is relatively complicated and the efficiency is low. Coating treatment such as Ti(C,N) and (Ti,Al)N on the surface of cemented carbide or high-speed steel tool substrate is an important way to improve the comprehensive mechanical properties and service lif...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10C23C28/00
CPCC23C24/10C23C28/324C23C28/345C23C28/347
Inventor 邢佑强高俊涛刘磊吴泽黄鹏孙东科刘晓军
Owner SOUTHEAST UNIV