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A method for preparing nanocrystalline tivn coating by reactive plasma spraying

A plasma and nanocrystalline technology, applied in the coating, metal material coating process, molten spraying, etc., can solve the problems of low bonding strength, high porosity, and difficult densification of the phase interface, and achieve superior high temperature stability. Improved usability and increased bonding strength

Active Publication Date: 2021-02-02
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The current preparation methods and research reports of TiVN coatings are mostly synthesized by thin film deposition and growth methods, such as reactive magnetic injection co-sputtering, PVD, CVD, etc., but there are still many defects in the obtained TiVN coatings, such as high porosity, phase The interface bonding strength is not high, it is difficult to be dense, etc.
And there is currently no research on high-performance TiVN coatings prepared by reactive plasma spraying

Method used

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  • A method for preparing nanocrystalline tivn coating by reactive plasma spraying
  • A method for preparing nanocrystalline tivn coating by reactive plasma spraying
  • A method for preparing nanocrystalline tivn coating by reactive plasma spraying

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh the original Ti powder and V powder with a mass ratio of 8:2 as raw materials for the preparation of the initial Ti-V mixed powder, wherein the particle size of Ti powder and V powder are both 200-500 mesh. And use stainless steel balls with diameters of 4mm, 6mm and 10mm respectively, and the mass ratio of 1:4:1 as the grinding balls, in which the mass ratio of the mixed powder to the total grinding balls is 1:8; the ball milling tank is the bottom A cylindrical mold with a diameter of 6cm and a height of 10cm.

[0033] The obtained simply mixed raw material powder and balls are mixed into the ball mill tank, vacuumed and sealed, filled with argon as an inert protective gas, and the sealed spherical tank is placed in a planetary ball mill with the speed set at 500r / min. The duration is set to 12h. After the ball milling is finished, sieving treatment is carried out to obtain Ti-V mechanical alloying powder with a particle size of 1-50 microns, which is used as a...

Embodiment 2

[0041] Weigh the original Ti powder and V powder with a mass ratio of 7.5:2.5 as the raw materials for the preparation of the initial Ti-V mixed powder. Except for the different proportions of the original powder, the methods and control parameters are the same example 1.

[0042] The mechanical alloy powder and TiVN coating prepared by the above method are similar to those in Example 1, and the composition and morphology analysis are relatively uniform and stable. Compared with Example 1, the surface composition will have a slightly increased white area, and its microhardness The average value of the test analysis is 1836Hv (Vickers hardness), and it can be seen that the hardness of the proportional feed powder is not much different from that of Example 1 after use.

Embodiment 3

[0044] Weigh the original Ti powder and V powder with a mass ratio of 7:3 as the raw materials for the preparation of the initial Ti-V mixed powder. Except for the different proportions of the original powder, the methods and control parameters are the same. example 1.

[0045] The mechanical alloy powder and TiVN coating prepared by the above method are similar to those in Example 1. Compared with Example 1 and Example 2, the white area distribution in its surface composition is more and uniform, and its microhardness test analyzes the average value It is 1904Hv (Vickers hardness), it can be seen that the hardness of this kind of ratio feeding powder is slightly improved compared with Examples 1 and 2 after use, which is a more reasonable proportion of ingredients.

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Abstract

The invention relates to a method for preparing a nanocrystalline TiVN coating by reactive plasma spraying. The method comprises the following steps: sand blasting is carried out on the surface of the required coating base material, followed by spraying a bonding primer on the surface of the metal base material after the sand blasting treatment; the Ti-V alloy powder obtained by mechanical ball milling is sprayed on the previous step The surface of the bonded base layer is formed to prepare a nanocrystalline TiVN coating with a thickness of 200-500 microns. The invention can effectively overcome the brittleness of nitride ceramics, improve the toughness, wear resistance and high temperature stability of the coating, and realize the TiN and VN solid solution composite nitride coating efficiently formed in reactive plasma spraying.

Description

Technical field: [0001] The invention adopts a method of mechanical alloying powder as a raw material for reactive plasma spraying, specifically a method for preparing a nanocrystalline TiVN coating by reactive plasma spraying, which belongs to the field of material surface treatment and ceramic processing technology. Background technique: [0002] With the development of high-speed and continuous machining, people's demand for tools and dies used in extreme environments is increasing, and higher requirements are put forward for the performance of tools and dies. Due to the problem that the performance of the traditional cermet substrate is greatly limited in the application, the cermet coating can be prepared on the metal substrate with good toughness, so that the high toughness, plasticity and thermal conductivity of the metal are comparable to the wear resistance of the ceramic. , heat resistance and corrosion resistance are organically combined. The surface hardness of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/134C23C4/02C23C4/06C23C4/10
CPCC23C4/02C23C4/06C23C4/10C23C4/134
Inventor 董艳春吕宜林薛明明李润豪邓先强张辰峰
Owner HEBEI UNIV OF TECH
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