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A nanocomposite tool coating with gradient composition design and its preparation method

A component design, nanocomposite technology, applied in coatings, nanotechnology, layered products, etc., can solve problems such as the inability to meet the requirements of better performance of tools, and achieve huge market potential and use value, mechanical wear resistance and The effect of improving the high temperature oxidation resistance

Active Publication Date: 2016-06-29
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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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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  • A nanocomposite tool coating with gradient composition design and its preparation method
  • A nanocomposite tool coating with gradient composition design and its preparation method
  • A nanocomposite tool coating with gradient composition design and its preparation method

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Embodiment example

[0026]

[0027] The cutting tool substrate pretreatment process in Example 3 is as follows: the uncoated carbide end mill is ultrasonically cleaned with a metal cleaning solution, rinsed with deionized water, and dried with dry and clean compressed air.

[0028] The coating steps are as follows: fix the pretreated uncoated carbide end milling cutter evenly on the bracket with a distance greater than or equal to 10mm, put it into the ion coating machine, adjust the rotation speed of the workpiece bracket to 5rpm, and pump it to the background Vacuum 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 about 0.6Pa, apply a negative bias voltage of 1000V to the substrate, and perform glow sputtering cleaning for 20min; then reduce the negative bias voltage of the substrate to 100V, Turn on the pure Ti target, adjust the target current to 100A, and bombard the substrate with high-energy Ti io...

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Abstract

The invention discloses a nanometer composite cutting tool coating with gradient composition design and a preparation method thereof. The surface of a cutting tool substrate is coated by a titanium nitride transition layer by using physical vapor deposition technology; then through gradient adjustment of arc target current, the surface of the substrate is coated by a titanium-aluminum-silicon nitride coating with gradiently increasing silicon content; finally, the surface of the substrate is coated by a silicon-enriched titanium-silicon-nitrogen coating; wherein the thickness of the titanium nitride transition layer is 0.1 to 0.3 mu m, the thickness of the gradiently changing titanium-aluminum-silicon nitride coating is 1 to 4 mu m, and the thickness of the surface silicon-enriched titanium-silicon-nitrogen coating is 0.2 to 0.5 mu m. According to the invention, the crystal sizes of the coating is in a range of 5 to 15 nm, the total thickness of the coating is 1.3 to 4.8 mu m, the microscopic hardness of the coating is 25 to 40 GPa, and high temperature stability reaches more than 1100 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 nanocomposite tool coating with gradient composition design 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 cuttin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/06C23C14/34B32B9/04B82Y40/00
Inventor 王成勇余东海王启民
Owner GUANGDONG UNIV OF TECH
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