High-hardness AlCrN nanocomposite coating and preparation process thereof

A preparation process and high hardness technology, applied in the direction of metal material coating process, coating, ion implantation plating, etc., can solve the problems of reducing the mechanical properties such as hardness and elastic modulus of the coating, and achieve good wear resistance, High hardness and toughness, good repeatability

Active Publication Date: 2017-06-27
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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  • High-hardness AlCrN nanocomposite coating and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In this example, an AlCrN nanocomposite coating is deposited on a polished high-speed steel sheet, and the sample size is 25×30×1 mm. The substrates were ultrasonically cleaned in acetone, alcohol, and distilled water for 20 min each, and then cleaned with high-purity N 2 Dry it, and then place it on the sample rack facing the target in the AIP-650 arc ion coating machine. The target materials are pure metal Cr and Al (99.99 wt. %) respectively, and the working gas and reaction gas are respectively high-purity Ar and N 2 (The purity is 99.999%).

[0019] First, the background vacuum of the vacuum chamber is evacuated to 1.0×10 -3 Below Pa; turn on the heating system, raise the temperature to 400 ℃, and then pass Ar gas 60 sccm in the vacuum chamber until the pressure in the coating chamber reaches 1 Pa, apply a negative bias of -800 V, and glow clean for 20 minutes. Turn on 4 pure Cr targets (the target current is selected as 80 A) to bombard and clean the surface o...

Embodiment 2

[0022] In this example, an AlCrN nanocomposite coating is deposited on a polished cemented carbide substrate YG8, and the sample size is 19×19×2 mm. The substrates were ultrasonically cleaned in acetone, alcohol, and distilled water for 20 min each, and then cleaned with high-purity N 2 Dry it, and then place it on the sample rack facing the target in the domestic AIP-650 arc ion coating machine. The target material is made of pure metal Cr and Al (both with a purity of wt. 99.9%), and the working gas and reaction gas are respectively made of Ar and N. 2 (The purity is 99.999%).

[0023] First, the background vacuum of the vacuum chamber is evacuated to 1.0×10 -3 Below Pa. Turn on the heating system, raise the temperature to 450 °C, and then pass 90 sccm of Ar gas into the vacuum chamber until the pressure in the coating chamber reaches 1 Pa, apply a negative bias voltage of -700 V, and glow clean for 20 minutes. Turn on four pure Cr targets (the target current is selecte...

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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 technology of an AlCrN nanocomposite coating with high hardness and high Al content. Background technique [0002] With the development of modern manufacturing industry, titanium alloys, high-temperature alloys and ultra-high-strength steel and other difficult-to-machine materials are widely used. High-speed ultra-high-speed cutting, high-speed hard cutting, green dry cutting and precision ultra-precision cutting for various difficult-to-machine materials 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 cutting tools, so that the tools can obtain excellent comprehensive mechanical properties, thereby greatly improving the machining efficiency. Coated tools have the characteristics of high surface hardness, good wear resistance...

Claims

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Application Information

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Patent Type & Authority Applications(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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