Preparation method of GNCD-CBN nanocomposite multi-layer coating tool with toughening mechanism

A nano-composite, multi-layer coating technology, applied in the direction of coating, metal material coating process, superimposed layer plating, etc., can solve the problems of poor bonding performance between coating and cemented carbide substrate, and low coating toughness. , to achieve the effect of improving wear resistance, improving coating toughness and extending tool life

Active Publication Date: 2019-08-27
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Description
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to invent a method for preparing a GNCD / cBN nanocomposite multi-layer coating tool with a toughening mechanism for the existing problems of poor bonding between the coating and the cemented carbide substrate and low toughness of the coating

Method used

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  • Preparation method of GNCD-CBN nanocomposite multi-layer coating tool with toughening mechanism
  • Preparation method of GNCD-CBN nanocomposite multi-layer coating tool with toughening mechanism
  • Preparation method of GNCD-CBN nanocomposite multi-layer coating tool with toughening mechanism

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Embodiment 1

[0033] Such as Figure 1-4 shown.

[0034] A preparation method of a GNCD-cBN nanocomposite multi-layer coating cutter with a toughening mechanism, comprising the following steps:

[0035] 1) Substrate pretreatment: use WC-Co cemented carbide blades as the substrate material, now place the WC-Co cemented carbide blades in acetone solution for ultrasonic cleaning for 15 minutes, and then put them in K 3 Fe(CN) 6 :KOH:H 2 O was ultrasonically cleaned for 20 minutes in a solution mixed with a mass ratio of 1:1:10, then soaked in a mixed solution with a concentration of 65% nitric acid and 36% hydrochloric acid at a volume ratio of 1:3 for 5 minutes, and finally Ultrasonic grinding with diamond micropowder suspension for 25 min, washing with deionized water, and drying to obtain the substrate.

[0036] 2) Microwave chemical vapor deposition gradient nano-diamond: put the pretreated substrate in the microwave chemical vapor deposition chamber, turn on the chiller, use a mechani...

Embodiment 2

[0042] Such as Figure 1-4 shown.

[0043] A preparation method of a GNCD-cBN nanocomposite multi-layer coating cutter with a toughening mechanism, comprising the following steps:

[0044] 1) Substrate pretreatment: use WC-Co cemented carbide blades as the substrate material, now place the WC-Co cemented carbide blades in acetone solution for ultrasonic cleaning for 15 minutes, and then put them in K 3 Fe(CN) 6 :KOH:H 2 O was ultrasonically cleaned for 20 minutes in a solution mixed with a mass ratio of 1:1:10, then soaked in a mixed solution with a concentration of 65% nitric acid and 36% hydrochloric acid at a volume ratio of 1:3 for 5 minutes, and finally Ultrasonic grinding with diamond micropowder suspension for 25 min, washing with deionized water, and drying to obtain the substrate.

[0045] 2) Hot wire chemical vapor deposition gradient nano-diamond: place the pretreated substrate in the hot wire chemical vapor deposition chamber, place the substrate about 4-6mm be...

Embodiment 3

[0050] The difference between this embodiment and Embodiments 1 and 2 is that the parameters used during substrate pretreatment meet the following conditions: use WC-Co cemented carbide blades as the substrate material, and place the WC-Co cemented carbide blades in an acetone solution Ultrasonic cleaning for 10 to 15 minutes, and then put in the K 3 Fe(CN) 6 :KOH:H 2 O in a solution mixed with a mass ratio of 1: 0.8 to 1.2: 8 to 12 and ultrasonically cleaned for 15 to 30 minutes, and then mixed with 65% nitric acid and 36% hydrochloric acid at a volume ratio of 1: 2 to 4 Soak the resulting mixed solution for not less than 5 minutes, and finally use the diamond nano powder suspension to ultrasonically clean for 15 to 30 minutes, and after cleaning with deionized water, dry it in a nitrogen environment for later use to obtain a substrate. All the other embodiments one and two are the same, and the performance of the deposited coating is as follows: Figure 2-4 shown.

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Abstract

The invention provides a preparation method of a nano composite GNCD-cBN multilayer coated cutter having toughening mechanism, wherein the composite coating is formed through alternate growth of gradient nano-crystalline diamond (GNCD) and cubic boron nitride (cBN). The GNCD coating is a gradually-varying coating layer, wherein the internal structure of the GNCD coating is in a gradient arrangement of high-content sp3 carbon + high-content sp2 carbon + high-content sp3 carbon. The coating has the hardness of the cBN and can be used for cutting ferrous metal material such as high-temperature alloy and high-strength steel; by means of the GNCD, thickness of the coating layer can be increased, and toughness of the coating during cutting process can be improved and strength and anti-impact performance of the coating are totally improved. The method significantly improves wear resistance of the coating cutter and prolongs the service of the cutter.

Description

technical field [0001] The present invention relates to a kind of superhard material film preparation technology, especially a kind of preparation method of GNCD / cBN nanometer multi-layer composite coating tool, specifically a kind of using microwave chemical vapor deposition or hot wire chemical vapor deposition combined with radio frequency magnetic A method for alternately depositing gradient nano-diamond coatings and cubic boron nitride nano-coatings on cemented carbide tool substrates by controlled sputtering deposition. Background technique [0002] With the rapid development of my country's aerospace and other modern manufacturing technologies, more and more high-strength and ultra-high-strength steels are used in aerospace vehicles. However, with the wide application of difficult-to-machine materials such as titanium alloys, high-temperature alloys, and high-strength ultra-high-strength steels; advanced high-speed ultra-high-speed cutting, high-speed hard cutting, gr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C16/27C23C14/06C23C14/02C23C16/02C23C28/04
Inventor 徐锋田帅许晨辉吴金鑫涂禄强王雪高继业左敦稳
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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