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A kind of Altin composite coating with high Al content and preparation method

A technology of Al content and coating, which is applied in the field of preparation of AlTiN composite coatings, can solve the problems of reducing coating hardness, elastic modulus and other mechanical properties, and achieve good wear resistance, strong practicability and wide application range Effect

Active Publication Date: 2018-04-03
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, Ti 1- x Al x When the x value in the N coating is higher than 0.65-0.70 (the specific value depends on the deposition process parameters), 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 Altin composite coating with high Al content and preparation method
  • A kind of Altin composite coating with high Al content and preparation method
  • A kind of Altin composite coating with high Al content and preparation method

Examples

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Embodiment 1

[0022] In this embodiment, an AlTiN 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, then dried with high-purity nitrogen, and then placed on the sample rack facing the target in the vacuum chamber. The rotation speed of the turntable was selected as 10 r / min. The target base distance is 150 mm. The coating process was carried out on an AIP-650 arc ion coating machine. The target materials were pure metal Ti and Al (both with a purity of 99.9 wt.%), and the working gas and reaction gas were respectively high-purity 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 400 ℃, then pass 80 sccm of Ar gas in the vacuum chamber until the pressure in the coating chamber reaches 1 Pa, apply a negative bias of ...

Embodiment 2

[0030] In this example, an AlTiN coating is deposited on a polished cemented carbide substrate YG8, and the sample size is 25×25×2 mm. The substrate was ultrasonically cleaned in acetone, alcohol, and distilled water for 20 min, then dried with high-purity nitrogen, and then placed on the sample rack facing the target in the vacuum chamber. The base distance is 150 mm. The coating process is carried out on an AIP-650 arc ion coating machine. The target materials are pure metal Ti and Al (both with a purity of wt. 99.9%), and the working gas and reaction gas are respectively Ar and N. 2 (The purity is 99.999%).

[0031] 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 100 sccm of Ar gas into the vacuum chamber until the pressure in the coating chamber reaches 1 Pa, apply a negative bias of -800 V, and turn on 4 pure Ti targets (the target current is selected as 6...

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Abstract

The invention relates to a nano-composite coating and a preparation technique thereof, specifically to a preparation process of a high Al content AlTiN nano-composite coating. The AlTiN nano-composite coating is prepared on a metal or hard alloy matrix by adopting an arc ion plating technique. To better adjust and control the contents of Al and Ti elements in the coating, pure metal Al and Ti(with purities of 99.9wt.% and diameters of 80mm) are adopted as targets, and 4 pure Ti targets and 4 pure Al targets are alternately uniformly distributed on the inner wall of a furnace body to improve the coating uniformity. The preparation method comprises the steps of: before coating, leading in Ar gas, turning on the Ti target, carrying out bombard purging on the matrix surface for 10-30min, then depositing a metal Ti transition layer, finally leading in reactant gas N2, and carrying out build-up of luminance on the Ti and Al targets simultaneously to deposit the AlTiN coating. The AlTiN nano-composite coating provided by the invention has simple preparation process, good repeatability and easy industrial production, and the prepared AlTiN coating has the advantages of higher hardness and strength, good high-temperature oxidation resistance and corrosion resistance, compact organization structure and strong binding force between the coating and the matrix.

Description

technical field [0001] The invention relates to coating preparation technology, in particular to a preparation technology of AlTiN composite coating with high Al content. Background technique [0002] TiN coating is the first nitride coating developed. Because of its high hardness, wear resistance and low friction coefficient, it is still widely used in the application fields of cutting tools, tools and molds. However, the oxidation resistance and high temperature thermal stability of TiN coating are poor. When the working temperature exceeds 500 ºC, a layer of loose TiO with low hardness will be formed on the surface of the coating. 2 Membrane, O 2 Harmful media such as oxides can enter the coating through the pores in the oxide film, causing the coating to fail rapidly. To solve this problem, elements such as Al and Si are usually added to the TiN coating, and the solid solution strengthening or grain refinement of these elements is used to improve the high temperature o...

Claims

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Application Information

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IPC IPC(8): C23C14/06C23C14/32C23C14/16
CPCC23C14/0021C23C14/0641C23C14/16C23C14/325
Inventor 范其香吴正环王铁钢刘艳梅李彤张涛
Owner TIANJIN UNIV OF TECH & EDUCATION TEACHER DEV CENT OF CHINA VOCATIONAL TRAINING & GUIDANCE
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