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Coating layer on blade base body

A coating and coating technology, applied in the direction of coating, metal material coating process, layered products, etc., can solve the problems of easy cracking of the coating, increased internal stress of the coating, insufficient toughness of the coating, etc. The effect of reducing internal stress, preventing crack propagation, and reducing blade chipping

Active Publication Date: 2014-10-08
XIAMEN GOLDEN EGRET SPECIAL ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the traditional CVD aluminum oxide coating, the crystal growth direction is random, which will cause the coating to be prone to cracks, the internal stress of the coating will increase, and the toughness of the coating will be insufficient.

Method used

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  • Coating layer on blade base body
  • Coating layer on blade base body
  • Coating layer on blade base body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0030] A coating coating on a blade substrate of the present invention has a total thickness of 5-40 μm, preferably 5-25 μm. A layer of aluminum oxide; the thickness of the aluminum oxide layer is 1 μm to 15 μm, with a very obvious fine columnar crystal structure, each grain in the aluminum oxide layer is arranged in the same direction, and the orientation is uniformly grown, and the columns of columnar crystals With the same column width of 0.2 μm to 4 μm.

[0031] The crystal grains of the aluminum oxide layer are very uniform, and the columns of columnar crystals have the same column width of 0.7 μm to 1.5 μm.

[0032] The alumina layer includes an alumina nucleation layer, and the alumina nucleation layer is deposited on a transition layer, and the transition layer includes a TiAlCNO layer and a TiCO layer; the thickness of the TiAlCNO layer is 0.1-3 μm, and the TiCO The thickness of the layer is 0.1 to 0.5 μm.

[0033] The percentage content of each element in the TiAlC...

specific example

[0045] Specific example: the composition is 8% (mass percentage) Co, 4% (Ta, Nb) C, 1% TiCN, the balance is the cemented carbide cutting blade of WC, its surface is coated with TiN layer, MT-TiCN layer , α-Al 2 o 3 layer, the thicknesses are 0.5-1 μm, 7-9 μm, 6-8 μm, respectively. The detailed process parameters of transition layer and aluminum oxide layer, that is, coating a, are shown in Table 1.

[0046] Table 1

[0047] steps

1

2

3

4

AlTiCNO

TiCO

al 2 o 3 Nucleation

Al 2 o 3

TiCl 4 (%)

4.0～2

2.1

N 2 (％)

4.0

CO 2 (%)

0.2～1.5

0.2～2.5

2

3.0

CO(%)

0.3～2

0.2～2.5

6.0

CH 4 (%)

1.0

1.0

AlCl 3 (%)

0.5～3.0

2.8

4

h 2 S

0.3

HCl

1.6

1.3

H 2

margin

margin

margin

margin

pressure (m...

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Abstract

The invention discloses a coating layer on a blade base body. The total thickness of the coating layer is 5-40 mu m. The coating layer at least comprises an aluminium oxide layer deposited by employing a chemical vapor deposition manner. The aluminium layer has the thickness of 1 mu m to 15 mu m, has extremely obvious fine-columnar crystal structure. Each crystal grain in the aluminium layer is arranged at a same direction and grows directionally uniformly. The columns of the columnar crystal have same width of 0.2 mu m to 4 mu m. On the one hand, the coating layer is capable of effectively reducing the internal stress of the coating, improving the toughness of the coating, preventing expansion of cracks and reducing tipping of a blade; and on the other hand, the coating layer is capable of improving the wear resistance of the blade. The coating layer of the cutting tool has excellent toughness and good wear resistance, and has excellent cutting performance in fields of cutting of materials such as steel, cast iron, stainless steel and the like.

Description

technical field [0001] The present invention relates to a coating comprising fine columnar crystalline α-Al 2 o 3 Coated-body cutting tools, in particular relate to a coated coating on an insert substrate. Background technique [0002] Al 2 o 3 The coating has high chemical stability and excellent thermal barrier properties, and is an ideal coating material for high-speed cutting tools. In addition, it needs to be emphasized that CVD is still economically capable of producing high-quality Al 2 o 3 The only technical means of coating. Deposit Al by CVD process 2 o 3 The coating can obtain three different phases, which are α-Al 2 o 3 ,κ-Al 2 o 3 and γ-Al 2 o 3 , where α-Al 2 o 3 is the only stable Al 2 o 3 Mutually. Metastable κ and γ phases will be transformed into stable α phases by heat treatment such as during deposition, heat treatment after deposition, and heat generated during cutting. The volume shrinkage that occurs at the phase transition will red...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B9/04C23C16/44C23C16/40C23C16/30
Inventor 陈艺聪郑清平刘洋卢志红张守全
Owner XIAMEN GOLDEN EGRET SPECIAL ALLOY
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