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Cutting tool for improving coating structure and preparation method thereof

A cutting tool and coating technology, which is applied in the field of cutting tools and its preparation process, can solve the problems of no comprehensive consideration of the influence effect, no in-depth research and description of grain size, etc., and achieve excellent anti-oxidation and crater wear resistance , Improve nucleation uniformity and density, and reduce roughness

Active Publication Date: 2013-06-26
ZHUZHOU CEMENTED CARBIDE CUTTING TOOLS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In summary, all existing technologies use transition layer technology to control α-Al 2 o 3 Nucleation to obtain α-Al with specific growth texture 2 o 3 coating, while having a direct effect on α-Al 2 o 3 The microhardness and grain size of the wear resistance of the coating have not been studied and described in depth, and α-Al has not been considered comprehensively. 2 o 3 Influence of grain size of coating on properties of coating and coated tool

Method used

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  • Cutting tool for improving coating structure and preparation method thereof
  • Cutting tool for improving coating structure and preparation method thereof
  • Cutting tool for improving coating structure and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0048] a kind of like figure 1 The cutting tool with improved coating structure of the present invention shown includes a substrate A1 and a coating 2 at least partially covered on the substrate A1. The coating 2 includes at least an inner layer B21, a transition layer C22 and an outer layer from the inside to the outside. D23.

[0049] in:

[0050] The inner layer B21 is mainly composed of MT-TiCN material with a thickness of 6 μm;

[0051] The outer layer D23 is mainly composed of α-Al 2 o 3 Material composition, thickness d=4μm, outer layer D23 is an ultra-fine-grained oxide coating, outer layer D of α-Al2 o 3 The average grain size S is 0.46μm;

[0052] Transition layer C22 includes transition layer C1 221 and transition layer C2 222 from outside to inside:

[0053] The transition layer C1 221 is mainly composed of titanium carbonitride TiC x1 N y1 o z1 Composition (specifically TiC 0.5 o 0.5 ), x1, y1, z1 represent TiC x1 N y1 o z1 The atomic percentages of ...

Embodiment 2

[0067] a kind of like figure 1 The cutting tool with improved coating structure of the present invention shown has the same coating structure, composition, microscopic composition, etc. as the cutting tool in Example 1, except that the outer layer α-Al 2 o 3 It is slightly different from Example 1. In this embodiment, the thickness d of the outer layer D is 2 μm, and the average grain size S is 0.4 μm. The preparation method of the present embodiment 2 is basically the same as that of the embodiment 1, only need to make adaptive adjustments on the process parameters.

Embodiment 3

[0069] a kind of like figure 1 The cutting tool with improved coating structure of the present invention shown includes a substrate A1 and a coating 2 at least partially covered on the substrate A1. The coating 2 includes at least an inner layer B21, a transition layer C22 and an outer layer from the inside to the outside. D23;

[0070] in:

[0071] The inner layer B21 is mainly composed of MT-TiCN material with a thickness of 4 μm;

[0072] The outer layer D23 is mainly composed of α-Al 2 o 3 Composed of materials, the thickness is d=3μm, the outer layer D23 is an ultra-fine-grained oxide coating, and the outer layer D is α-Al 2 o 3 The average grain size S is 0.49μm;

[0073] Transition layer C22 includes transition layer C1 221 and transition layer C2 222 from outside to inside:

[0074] The transition layer C1 221 is mainly composed of titanium carbonitride TiC x1 N y1 o z1 Composition (specifically TiC 0.3 o 0.7 ), namely x1=0.3, y1=0, z1=0.7, z1 / (x1+y1+z1)=0....

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Abstract

The invention discloses a cutting tool for improving a coating structure. The cutting tool comprises a matrix and a coating covering the matrix. The coating comprises an inner layer B, a transitional layer C and an outer layer D from inside to outside. The inner layer B consists of transitional elements and nonmetal compounds. The transitional layer C comprises a transitional layer C1 and / or a transitional layer C2. The transitional layer C1 and C2 are mainly formed by carbon oxynitride with titanium. The outer layer D has a single phase alpha-Al2O3 structure. The thickness d of the outer layer D is 0.5-4 mu m. The mean grain size S is greater than or equal to 0.2 mu m but less than or equal to 0.5 mu m. The preparation method comprises the following steps of: first, preparing the tool matrix; then, sequentially depositing the inner layer B, the transitional layer C2, the transitional layer C1 and the outer layer D in a same coating period; and then, performing surface treatment to manufacture the cutting tool. The cutting tool provided by the invention is high in hardness and good in wear resistance, and has excellent cutting performance in cutting materials such as steel, stainless steel and cast iron.

Description

technical field [0001] The invention belongs to the field of metal cutting, in particular to a coated cutting tool and a preparation process thereof. Background technique [0002] Aluminum oxide coatings have been deposited on machined tools by chemical vapor deposition (CVD) for more than 20 years. The excellent wear and corrosion resistance properties of alumina are widely discussed in the literature. CVD alumina coatings deposited on cutting tools are commonly α-Al 2 o 3 and κ-Al 2 o 3 Two phases, Al during CVD production 2 o 3 In addition to stable α, there are κ and θ phases, CVD κ-Al 2 o 3 The grain size is 0.5μm~1.0μm, and generally columnar crystal, κ-Al 2 o 3 There are almost no dislocations and holes in it. κ-Al in steel cutting 2 o 3 It has good cutting performance; its disadvantage is that during cutting, due to local high temperature and high pressure formed by extrusion, it will also cause κ-Al 2 o 3 to α-Al 2 o 3 transformation, because α-Al ...

Claims

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Application Information

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IPC IPC(8): C23C28/00B23B27/14
Inventor 陈响明刘王平王社权李秀萍
Owner ZHUZHOU CEMENTED CARBIDE CUTTING TOOLS CO LTD
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