Preparation method of Cr-containing TiCN-based composite coating

A composite coating and composite powder technology, applied in the direction of coating, metal material coating process, melt spraying, etc., to achieve the effect of reducing the amount of wear, enhancing hardness and wear resistance, and improving wear resistance

Active Publication Date: 2017-02-22
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method adds Cr components to the titanium-carbon composite spraying powder, which further improves the hardness of the TiCN ceramic coating, overcomes the disadvantage of insufficient wear resistance of the TiCN ceramic coating, and significantly enhances the bonding strength between the TiCN ceramic coating and the substrate.

Method used

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  • Preparation method of Cr-containing TiCN-based composite coating
  • Preparation method of Cr-containing TiCN-based composite coating
  • Preparation method of Cr-containing TiCN-based composite coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In this example, a reactive plasma spraying process was used to prepare a micro-nano-scale multi-scale TiCN-Cr metal-based ceramic composite coating on the surface of the 45# steel substrate sample, and the main phase of the prepared coating was TiC 0.7 N 0.3 , Cr mainly exists in the form of Cr element in the coating, and a small amount dissolves into the TiCN lattice to form Cr-Ti-N ternary phase Cr 0.5 Ti 0.5 N.

[0036] The preparation method of this coating is as follows:

[0037] (1) Put the 45# steel substrate sample into the TPS-1 air pressure sandblasting machine, and perform sandblasting and roughening treatment on the surface. The abrasive particles are sucked into the nozzle, accelerated in the high-pressure airflow, and sprayed onto the surface of the substrate. , to obtain a clean and rough surface, thereby increasing the bonding force between the substrate and the coating;

[0038] (2) Using graphite as the carbon source, according to the mass ratio o...

Embodiment 2

[0047] In this example, a reactive plasma spraying process was used to prepare a micro-nano-scale multi-scale TiCN-Cr metal-based ceramic composite coating on the surface of the 45# steel substrate sample, and the main phase of the prepared coating was TiC 0.7 N 0.3 , Cr mainly exists in the form of Cr element in the coating, and a small amount dissolves into the TiCN lattice to form Cr-Ti-N ternary phase Cr 0.5 Ti 0.5 N.

[0048] The preparation method of the coating is as follows:

[0049] Graphite is used as the carbon source, and the mass ratio of Ti and C powder is 5:1. Before spraying the coating, Ni-10%wtAl self-fluxing alloy powder with a thickness of 110 μm is pre-sprayed on the surface of the steel substrate as the bottom layer (or bonding bottom layer), the quality of Cr powder is 30% of the quality of composite powder to obtain the original feeding composite powder for spraying, adjust working current 500A, arc voltage 70V, spray, other steps are identical with ...

Embodiment 3

[0056] In this example, a reactive plasma spraying process was used to prepare a micro-nano-scale multi-scale TiCN-Cr metal-based ceramic composite coating on the surface of a 304 stainless steel substrate sample, and the main phase of the prepared coating was TiC 0.7 N 0.3 , Cr mainly exists in the form of Cr element in the coating, and a small amount dissolves into the TiCN lattice to form Cr-Ti-N ternary phase Cr 0.5 Ti 0.5 N.

[0057] The preparation method of the coating is as follows:

[0058] Graphite is used as the carbon source, and the mass ratio of Ti and C powder is 5:1. Before spraying the coating, Ni-10%wtAl self-fluxing alloy powder with a thickness of 110 μm is pre-sprayed on the surface of the steel substrate as the bottom layer (or bonding bottom layer), the quality of Cr powder is 25% of the quality of composite powder to obtain the original feeding composite powder for spraying, adjust working current 500A, arc voltage 70V, spray, other steps are identic...

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Abstract

The invention discloses a preparation method of a Cr-containing TiCN-based composite coating. The method comprises the steps of step 1, carrying out roughening treatment on the surface of a matrix sample; step 2, mechanically mixing Ti/C composite powder with Cr powder to obtain original feeding composite powder; step 3, spraying Ni-Al self-fluxing alloy powder on the surface of a matrix in advance to obtain a bottom layer of which the thickness is 90 to 120 <mu>m, wherein the weight percent of Al in the Ni-Al self-fluxing alloy powder is 10 wt%; and step 4, spraying the original feeding composite powder on the surface of the bottom layer to obtain a TiCN-Cr metal-based ceramic composite coating of which the thickness is 300 to 500 <mu>m. The plasma spraying TiCN-Cr metal-based ceramic composite coating provided by the invention has relatively high hardness and good abrasion resistance and corrosion resistance, is suitable for working under abrasive and corrosive environment conditions like the fields of machinery manufacturing of cutting tools, drills and molds, automobile manufacturing and aerospace, and has quite wide application prospect.

Description

technical field [0001] The invention relates to a preparation method of a sprayed coating, in particular to a plasma sprayed coating with high hardness and high wear resistance and a preparation method thereof. Background technique [0002] TiCN is a ternary superhard ceramic material, which is a solid solution of TiN and TiC. It has high hardness of ceramic material (HV=2472kg / mm 2 ) High chemical stability and wear resistance, good high temperature resistance, has been widely used in many fields such as mechanical chemical industry, automobile manufacturing and aerospace. [0003] At present, surface treatment methods such as plasma-assisted vapor deposition (PACVD), chemical vapor deposition (CVD) and ion implantation are commonly used to prepare TiCN. Although these methods have made outstanding progress in preparing TiCN coatings, due to the existence of these methods The deposition efficiency is low (2~10μm / h), the thickness of the film is too thin (10~50μm), the com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/06
CPCC23C4/06
Inventor 何继宁陈凯张迪秦艳芳张建新章凡勇
Owner HEBEI UNIV OF TECH
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