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A kind of high hardness alcrn nanocomposite coating and its preparation technology

A preparation process and high hardness technology, applied in metal material coating process, coating, vacuum evaporation plating and other directions, can solve the problems of reducing the mechanical properties such as hardness and elastic modulus of the coating, and achieve good wear resistance, The effect of wide application range and low coefficient of friction

Active Publication Date: 2019-03-15
TIANJIN UNIV OF TECH & EDUCATION TEACHER DEV CENT OF CHINA VOCATIONAL TRAINING & GUIDANCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the Al content in the coating is too high and the ratio of Al / (Al+Cr) exceeds 77 at.%, Al and N elements will form a low-hardness hexagonal AlN (12 GPa), which will reduce the hardness and elastic modulus of the coating. Isomechanical properties

Method used

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  • A kind of high hardness alcrn nanocomposite coating and its preparation technology

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Experimental program
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Effect test

Embodiment 1

[0018] In this embodiment, an AlCrN nano-composite coating is deposited on a polished high-speed steel sheet, and the sample size is 25×30×1 mm. The substrate was ultrasonically cleaned in acetone, alcohol and distilled water for 20 minutes, and then used high-purity N 2 Dry it and place it on the sample rack facing the target in the AIP-650 arc ion coating machine. The rotation speed of the rotating rack is 10 r / min and the target base distance is 150 mm. The target materials are respectively pure metal Cr and Al (purity 99.99 wt. %), and the working gas and reaction gas are respectively selected high-purity Ar and N 2 (The purity is 99.999%).

[0019] First evacuate the background vacuum of the vacuum chamber to 1.0×10 -3 Pa below; turn on the heating system, raise the temperature to 400 ℃, then pass Ar gas 60 sccm into the vacuum chamber until the pressure in the coating chamber reaches 1 Pa, add -800 V negative bias, and glow cleaning for 20 minutes. Turn on 4 pure Cr target...

Embodiment 2

[0022] In this embodiment, an AlCrN nanocomposite coating is deposited on the polished hard alloy substrate YG8, and the sample size is 19×19×2 mm. The substrate was ultrasonically cleaned in acetone, alcohol and distilled water for 20 minutes, and then used high-purity N 2 Dry it and place it on the sample rack facing the target in the domestic AIP-650 arc ion coating machine. The rotating rack speed is 20 r / min and the target base distance is 150 mm. The target materials are respectively pure metal Cr and Al (purity is wt. 99.9%), and the working gas and reaction gas are respectively selected as Ar and N 2 (The purity is 99.999%).

[0023] First evacuate the background vacuum of the vacuum chamber to 1.0×10 -3 Pa below. Turn on the heating system and increase the temperature to 450 ℃, then inject 90 sccm of Ar gas in the vacuum chamber until the pressure in the coating chamber reaches 1 Pa, add -700 V negative bias, and glow for 20 minutes. Turn on 4 pure Cr targets (the targ...

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Abstract

The invention relates to a nanocomposite coating and a preparation technology of the nanocomposite coating, in particular to a preparation process for a high-Al-content AlCrN nanocomposite coating. The AlCrN nanocomposite coating is prepared on a metal or cemented carbide substrate by the adoption of an electric arc ion plating technology. Pure metal Al and Cr are used as targets, and the content of Al and Cr in the coating is adjusted and controlled by controlling the current of the Al targets and the Cr targets. The four pure Cr targets and the four pure Al targets are evenly distributed on the inner wall of a furnace body at intervals. Ar gas is introduced firstly before film plating, the bias pressure of 600-1,000 V is adopted, glow cleaning is conducted on the substrate for 10-20 min, then the Cr targets are opened, bombardment cleaning is conducted on the substrate, the bias pressure is gradually lowered to 30-100 V, and the metal Cr layer is deposited. The preparation process of the AlCrN nanocomposite coating is simple, and industrial production is facilitated; and the prepared AlCrN coating has the high hardness and strength and good high-temperature and oxidation resistance and corrosion resistance.

Description

Technical field [0001] The invention relates to a novel coating preparation technology, in particular to a preparation process of an AlCrN nano composite coating with high hardness and high Al content. Background technique [0002] With the development of modern manufacturing industry, titanium alloys, superalloys and ultra-high-strength steels are widely used for high-speed ultra-high-speed cutting, high-speed hard cutting, green dry cutting, and precision ultra-precision. Cutting and other advanced machining processes emerge in endlessly. The use of coating technology can effectively improve the service life, cutting efficiency and surface quality of the cutting tool, so that the tool can obtain excellent comprehensive mechanical properties, thereby greatly improving the machining efficiency. Coated tools have the characteristics of high surface hardness, good wear resistance, stable chemical properties, heat resistance, oxidation resistance, and low friction coefficient. Coat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/34C23C14/02C23C14/06C23C14/16
CPCC23C14/0036C23C14/022C23C14/025C23C14/0641C23C14/165C23C14/3464
Inventor 范其香王铁钢吴正环刘艳梅张涛
Owner TIANJIN UNIV OF TECH & EDUCATION TEACHER DEV CENT OF CHINA VOCATIONAL TRAINING & GUIDANCE
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