Multilayer nanometer composite cutting tool coating and preparation method thereof

A nano-composite and coating technology, applied in the direction of coating, metal material coating process, layered products, etc., can solve the problems that cannot meet the requirements of better performance of cutting tools, and achieve huge market potential and use value, mechanical resistance Effect of improving wear performance and high temperature oxidation resistance

Active Publication Date: 2014-11-05
GUANGDONG UNIV OF TECH
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  • Abstract
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Problems solved by technology

[0004] Although TiCrN and TiAlN coatings effectively improve the mechanical wear resistance of the tool, they still cannot meet the requirements of modern high-speed machining for better performance of the tool.

Method used

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  • Multilayer nanometer composite cutting tool coating and preparation method thereof
  • Multilayer nanometer composite cutting tool coating and preparation method thereof
  • Multilayer nanometer composite cutting tool coating and preparation method thereof

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Embodiment example

[0027]

[0028] The pretreatment process of the cemented carbide end mill substrate in this implementation is as follows: the uncoated cutter is ultrasonically cleaned with a metal cleaning solution, rinsed with deionized water, and dried with dry and clean compressed air.

[0029] The coating step of the described embodiment 3 is: the pretreated uncoated cemented carbide end milling cutter is evenly fixed on the support with a distance greater than or equal to 10mm, loaded into the coating machine, and the rotating speed of the workpiece support is adjusted to 5 rpm, pumped to a background vacuum of 2.5×10 -3 Pa, turn on the heater at the same time, raise the temperature to 500 °C; open the Ar gas flow valve, adjust the vacuum chamber to 0.6 Pa, apply a negative bias voltage of 800 V to the substrate, and perform glow sputtering cleaning for 20 min; then reduce the negative bias voltage of the substrate to 100 V, turn on the pure Ti target, adjust the target current to 100...

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Abstract

The invention discloses a multilayer nanometer composite cutting tool coating and a preparation method thereof. The surface of a cutting tool substrate is coated with a titanium nitride transition layer by using physical vapor deposition technology and is then alternately and periodically coated by multiple layers of an aluminum-titanium-silicon nitride coating and an aluminum-chromium-nitrogen coating, wherein the thickness of the titanium nitride transition layer is 0.1 to 0.5 mu m, the thickness of each layer of the aluminum-titanium-silicon nitride coating and the aluminum-chromium-nitrogen coating is 0.1 to 0.5 mu m, and the substrate is coated by 4 to 20 layers, thereby forming the AlTiSiN/AlCrN nanometer composite cutting tool coating with a multilayer structure. According to the invention, the crystal size of the coating is in a range of 5 to 15 nm, the total thickness of the coating is 1 to 6 mu m, the microscopic hardness of the coating is 25 to 40 GPa, and high temperature stability reaches more than 1050 DEG C. A cutting tool prepared by using the coating has greatly improved resistance to mechanical wear and high temperature oxidation resistance and can meet demands of high speed processing for better performance of a cutting tool material.

Description

technical field [0001] The invention relates to a multilayer nanocomposite tool coating and a preparation method thereof. Background technique [0002] Use physical or chemical vapor deposition method to coat one or more layers of high hardness, high wear resistance and high temperature resistance on the surface of cemented carbide, high speed steel or ceramic blade substrate with good strength and toughness. Metal or non-metal compound coating to reduce abrasive and chemical wear between the tool and the workpiece, protect the tool base material, and improve the cutting efficiency of the tool. [0003] The hard coating materials prepared by physical vapor deposition technology in the early days are usually simple TiN and TiC coatings, which have high resistance to mechanical wear, abrasive wear and low friction coefficient, but the high temperature oxidation resistance of the coating Low performance, not suitable for high-speed machining or dry cutting conditions. At pres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/34C23C14/54C23C14/06B32B9/00
Inventor 王成勇余东海王启民
Owner GUANGDONG UNIV OF TECH
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