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A multi-layer composite coating suitable for milling and its preparation method

A multi-layer composite and milling technology, applied in coating, metal material coating process, vacuum evaporation coating and other directions, can solve the problems of insufficient deposition energy, high brittleness, difficult α structure of the coating, and avoid stress. Oversized, high strength and toughness, strong bonding effect

Active Publication Date: 2021-04-30
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the nitride coating also has shortcomings: high brittleness, insufficient bonding strength with the substrate, and insufficient thermal stability under high-temperature milling conditions
However, the disadvantage of this method is that the deposition energy is insufficient, which limits its preparation of oxide coatings. The Al deposited by this method 2 o 3 It is difficult for the coating to obtain an α structure with excellent performance, which also greatly restricts the development of multilayer composite coatings.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Put the clean cemented carbide substrate into the vacuum chamber of the plasma-enhanced composite ion coating system, and when the vacuum of the back is evacuated to 0.05Pa, turn on the auxiliary heating device on the furnace wall to heat the substrate, and at the same time turn on the rotating power to make the substrate Rotate continuously, heat until the substrate temperature reaches 380°C; then pass argon gas into the vacuum chamber, adjust the flow rate of argon gas to ensure the pressure is 0.2Pa, and then apply a DC bias voltage of -200V and a pulse bias voltage of -400V to the substrate , using the ionized Ar + Etch the surface of the substrate for 80 minutes; turn off the bias voltage of the substrate in turn, adjust the flow of argon to ensure that the working pressure is 0.15Pa, turn on the main arc power supply of the evaporation plating for evaporation coating, the main arc current on the crucible is 190A, and evaporate the raw material for Co 0.15 Ni 0.1...

Embodiment 2

[0027] Put the clean cemented carbide substrate into the vacuum chamber of the plasma-enhanced composite ion coating system, and when the vacuum of the back is evacuated to 0.05Pa, turn on the auxiliary heating device on the furnace wall to heat the substrate, and at the same time turn on the rotating power to make the substrate Rotate continuously, heat until the substrate temperature reaches 380°C; then pass argon gas into the vacuum chamber, adjust the flow rate of argon gas to ensure the pressure is 0.15Pa, and then apply a DC bias voltage of -200V and a pulse bias voltage of -300V to the substrate , using the ionized Ar + Etch the surface of the substrate for 30 minutes; turn off the bias voltage of the substrate in turn, adjust the flow of argon to ensure that the working pressure is 0.2Pa, turn on the main arc power supply of the evaporation plating for evaporation coating, the main arc current on the crucible is 210A, and evaporate the raw material for Co 0.2 Ni 0.2 ...

Embodiment 3

[0029] Put the clean cemented carbide substrate into the vacuum chamber of the plasma-enhanced composite ion coating system, and when the vacuum of the back is evacuated to 0.04Pa, turn on the auxiliary heating device on the furnace wall to heat the substrate, and at the same time turn on the rotating power to make the substrate Rotate continuously, heat until the substrate temperature reaches 380°C; then pass argon gas into the vacuum chamber, adjust the flow rate of argon gas to ensure the pressure is 0.25Pa, and then apply a DC bias of -100V and a pulse bias of -300V to the substrate , using the ionized Ar + Etch the surface of the substrate for 90 minutes; turn off the bias voltage of the substrate in turn, adjust the flow of argon to ensure that the working pressure is 0.15Pa, turn on the main arc power supply of evaporation plating for evaporation coating, the main arc current on the crucible is 220A, and evaporate the raw material for Co 0.2 Ni 0.2 Cr 0.2 Al 0.2 Y ...

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Abstract

The multi-layer composite coating suitable for milling disclosed in the present invention is composed of CoNiCrAlY high-entropy alloy bonding layer, α-Cr 2 O 3 Oxide Template Layer, α‑Al 2 O 3 Oxide support layer, TiAlCrON oxynitride connection layer, TiAlCrN nitride wear-resistant layer is composed of five sub-layers. The preparation method is as follows: after the substrate is heated and ion-etched, a CoNiCrAlY layer is first deposited on the substrate by an arc evaporation plating process; then a cathodic arc ion plating process is used, and then α-Cr is successively deposited 2 O 3 Layer, α‑Al 2 O 3 layer, TiAlCrON layer and TiAlCrN layer. The multi-layer composite coating organically combined with different functional sub-layers has high toughness and good impact resistance, is very suitable for intermittent cutting mode milling, and has a simple preparation process and is convenient for industrial production.

Description

technical field [0001] The invention belongs to the technical field of cutting tool surface coatings, and in particular relates to a multilayer composite coating suitable for milling and a preparation method thereof. Background technique [0002] Milling is an important processing method of cutting. The characteristic of milling is intermittent cutting, and the tool bears impact load during the processing. Milling requires milling cutters and their surface coating materials to have good toughness and impact resistance. Nitride coating is a widely used coating material for cutting tools such as milling cutters and turning tools, such as TiAlN, TiAlCrN, TiAlSiN, etc. The nitride coating has high hardness and good wear resistance. However, the nitride coating also has shortcomings: high brittleness, insufficient bonding strength with the substrate, and insufficient thermal stability under high-temperature milling conditions. Oxide coatings (such as Al 2 o 3 ) Compared with ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/02C23C14/32C23C14/14C23C14/08C23C14/06
CPCC23C14/0021C23C14/022C23C14/0641C23C14/0676C23C14/081C23C14/083C23C14/14C23C14/325
Inventor 鲜广鲜丽君赵海波
Owner SICHUAN UNIV