A kind of preparation method of ticn gradient coating

A gradient coating and coating technology, which is applied in the direction of coating, metal material coating process, solid diffusion coating, etc., can solve the problems of unstable arc current, affecting coating performance, large internal stress, etc., and achieve the elimination of interface Effects of reducing stress, reducing coefficient of friction, and improving adhesion

Active Publication Date: 2019-04-26
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the patented technology can be adjusted by N 2 and C 2 h 2 The gas flow rate is used to control the content distribution of C and N elements in the TiCN coating, but there is an increase in C 2 h 2 The flow rate can easily cause the technical problem that the arc current of the coating is unstable during the PVD deposition process, which leads to the occurrence of large particles, pores and other structural defects in the microstructure of the coating, which affects the performance of the coating.
In addition, the deposited coating has not been annealed, the internal stress between the coating and the substrate is relatively large, and the improvement of the bonding strength of the coating is limited.

Method used

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  • A kind of preparation method of ticn gradient coating
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  • A kind of preparation method of ticn gradient coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A. Preparation of TiN-coated bulk

[0027] TiN was deposited on the surface of YT15 cemented carbide substrate using a multi-arc ion coating machine under the process conditions of nitrogen flow rate 360sccm, argon flow rate 40sccm, arc current 100A, pulse bias voltage 200V, duty cycle 50%, and substrate temperature 250°C. Coating, TiN coating blocks were prepared, and the coating adhesion and average friction coefficient were 48.5 N and 0.65, respectively.

[0028] B. Preparation of solid carburizing agent

[0029] According to the proportion of activated carbon: 20%, KBF4: 20%, Al: 10%, SiC: 50% (by weight percentage), the solid carburizing agent is weighed and prepared, and it is dry mixed in an ordinary ball mill for 24 hours. The speed of the ball mill is 45 r / min.

[0030] C, preparation has TiCN gradient coating

[0031] S1: Fill the graphite crucible with the mixed solid carburizing agent, and at the same time bury the TiN-coated block in the middle of the ca...

Embodiment 2

[0035] A. Preparation of TiN-coated bulk

[0036] TiN was deposited on the surface of YT15 cemented carbide substrate using a multi-arc ion coating machine under the process conditions of nitrogen flow rate 360sccm, argon flow rate 40sccm, arc current 100A, pulse bias voltage 200V, duty cycle 50%, and substrate temperature 250°C. coating, its coating adhesion and average coefficient of friction were 48.5 N and 0.65, respectively.

[0037] B. Preparation of solid carburizing agent

[0038] According to the proportion of activated carbon: 30%, KBF4: 10%, Al: 5%, SiC: 50% (in terms of weight percentage), the solid carburizing agent is weighed and prepared, and dry-mixed in an ordinary ball mill for 24 hours. The speed of the ball mill is 45 r / min.

[0039] C, preparation has TiCN gradient coating

[0040] S1: Fill the graphite crucible with the mixed solid carburizing agent, and at the same time bury the TiN-coated block in the middle of the carburizing agent powder, and then ...

Embodiment 3

[0043] A. Preparation of TiN-coated bulk

[0044] TiN was deposited on the surface of YT15 cemented carbide substrate using a multi-arc ion coating machine under the process conditions of nitrogen flow rate 360sccm, argon flow rate 40sccm, arc current 100A, pulse bias voltage 200V, duty cycle 50%, and substrate temperature 250°C. coating, its coating adhesion and average coefficient of friction were 48.5 N and 0.65, respectively.

[0045] B. Preparation of solid carburizing agent

[0046] According to the ratio of activated carbon: 25%, KBF4: 15%, Al: 7.5%, SiC: 52.5% (by weight percentage), the solid carburizing agent is weighed and prepared, and it is dry mixed in an ordinary ball mill for 24 hours. The speed of the ball mill is 45 r / min.

[0047] C, preparation has TiCN gradient coating

[0048] S1: Fill the graphite crucible with the mixed solid carburizing agent, and at the same time bury the TiN-coated block in the middle of the carburizing agent powder, and then tigh...

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Abstract

The invention discloses a preparation method of a TiCN gradient coating. The preparation method comprises the following steps: S1:, filling a graphite crucible with a solid carburizing agent, then, backfilling a TiN coating block into the carburizing agent, and then, sealing the graphite crucible by using a graphite cover; S2: placing the graphite crucible sealed by using the graphite cover in the step S1 into a vacuum carbon tube furnace; and then, heating from the room temperature to 800-850 DEG C under an Ar or vacuum condition, next, keeping the temperature for 4-8h to carry out carburization reaction to obtain the TiCN gradient coating. The TiCN gradient coating not only has the characteristic of gradient component distribution that the core layer is rich in nitrogen and the surface layer is rich in carbon, and the friction coefficient of the coating can be remarkably reduced; and meanwhile, solid carburization simultaneously has an annealing treatment effect, so that the interfacial stress between a matrix and the coating in a coating deposition process can be further eliminated, and the adhesive force between the coating and the matrix can be increased.

Description

technical field [0001] The invention belongs to the technical field of cutting tool coating preparation, and in particular relates to a preparation method of a TiCN gradient coating. Background technique [0002] With the development of modern machining industry towards high-precision, high-speed cutting and dry cutting technology, it is difficult for traditional carbide cutting tools to adapt to the new requirements of difficult-to-machine materials. Studies have shown that coating such as TiN, Al on the surface of cemented carbide substrate 2 o 3 And other hard coatings can significantly improve the comprehensive mechanical properties and service life of the tool. Therefore, compared with traditional carbide cutting tools, coated carbide cutting tools are more competitive in the market as high value-added products. , [0003] TiCN coating is a ternary coating developed on the basis of TiN binary coating. The traditional TiCN coating is a coating obtained by co-deposit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/64C23C14/32C23C14/58C23C14/06
CPCC23C8/64C23C14/0641C23C14/325C23C14/5846
Inventor 金永中王璐林修洲崔学军何刚
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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