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A dual-hard phase dual-bonded phase metal carbide ceramic powder with a core-shell structure and a preparation method thereof

A metal carbide and ceramic powder technology, which is applied in metal processing equipment, metal material coating technology, transportation and packaging, etc., can solve the problems of excessive wear and failure of metal parts, reduced coating performance, and short service life, etc., to achieve High content of hard phase, improved hardness and fracture toughness, good bonding effect

Active Publication Date: 2022-07-26
JIUJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the use of cermets as wear-resistant coatings is expected to solve the phenomenon of rapid wear and failure and short service life of metal parts
The thermal spraying method is one of the most commonly used methods for preparing cermet coatings in industrial production. However, the temperature during thermal spraying is as high as thousands of degrees, and the thermal spraying process is usually carried out in an oxygen-enriched environment, and cermets such as WC-Co are prone to Decomposition, oxidation, and often form multiple hard and brittle phases with the metal binder phase, thereby reducing the performance of the coating

Method used

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  • A dual-hard phase dual-bonded phase metal carbide ceramic powder with a core-shell structure and a preparation method thereof
  • A dual-hard phase dual-bonded phase metal carbide ceramic powder with a core-shell structure and a preparation method thereof
  • A dual-hard phase dual-bonded phase metal carbide ceramic powder with a core-shell structure and a preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Core-shell structure 70WC-16Cr is prepared according to the preparation method of double-hard phase double-binder phase metal carbide ceramic powder with core-shell structure of the present invention 3 C 2 -10Co(La 2 O 3 )4Ni ceramic powder, the process flow refers to the appendix figure 2 , including the following steps:

[0034] Step 1: Select WC powder with a particle size range of 5 to 45 μm, put it into a ball mill jar and use ethanol as a process control agent for wet ball milling (both the grinding ball and the ball mill jar are WC-12Co cemented carbide), and the ball-to-material ratio is 20. : 1, the rotation speed is 250 rpm, and the ball milling time is 72h. The WC powder after ball milling is sieved to obtain WC powder with a particle size range of 1.2 to 2.5 μm; then the sieved WC powder is cleaned and surface activated. The specific operation Process: Put WC powder into anhydrous ethanol solution with a concentration of about 50%, ultrasonically clean ...

Embodiment 2

[0042] The core-shell structure 55WC-30Cr is prepared according to the preparation method of the double-hard phase double-binder phase metal carbide ceramic powder with the core-shell structure of the present invention 3 C 2 -7.4Co(La 2 O 3 )7.6Ni ceramic powder, including the following steps:

[0043]Step 1: Select WC powder with a particle size range of 5 to 45 μm, put it into a ball mill jar and use ethanol as a process control agent for wet ball milling (both the grinding ball and the ball mill jar are WC-12Co cemented carbide), and the ball-to-material ratio is 20. : 1, the rotation speed is 250 rpm, and the ball milling time is 72 hours. The WC powder after ball milling is sieved to obtain WC powder with a particle size range of 1.2 to 2.5 μm; then the WC powder in the powder sieve is cleaned and surface activated. The specific operation process : Put WC powder into anhydrous ethanol solution with a concentration of about 50%, ultrasonically clean for about 10 minutes...

Embodiment 3

[0051] The 70WC-16Cr prepared in Example 1 3 C 2 -10Co(La 2 O 3 ) 4Ni ceramic powder and traditional agglomerated metal carbide ceramic powder were deposited on the Q235 steel substrate respectively by supersonic spraying to obtain a deposited coating, wherein the 70WC-16Cr prepared in Example 1 3 C 2 -10Co(La 2 O 3 ) The XRD pattern of the deposited coating structure formed by 4Ni ceramic powder is shown in the appendix. Figure 5 , SEM analysis of microstructure structure, see attached Figure 7 , the XRD diffraction pattern of the deposited coating structure formed by the traditional agglomerated metal carbide ceramic powder is shown in the appendix Image 6 , see the attached microstructure Figure 8 .

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Abstract

The invention discloses a dual-hard phase dual-bonded phase metal carbide ceramic powder with a core-shell structure and a preparation method thereof. Compared with the traditional agglomerated metal carbide ceramic powder, the metal-ceramic powder of the invention has a coating core The shell structure can reduce the oxidation of WC during the ceramic powder deposition process, thereby avoiding the decomposition of WC particles and the harmful ternary hard and brittle phase (W 6 Co 6 C, W 3 Co 3 C) formation, also by utilizing Cr 3 C 2 The melting and dispersion distribution of the particles realize the dual-phase strengthening of the matrix and the hard particles, which can greatly improve the hardness and fracture toughness of the coating at the same time; The matrix interface is tightly bonded, and the carbide particles are tightly bonded with bonding; the preparation method of the cermet powder disclosed in the invention has simple operation and high feasibility, and lays a foundation for the development and application of the cermet powder.

Description

technical field [0001] The invention relates to hard alloy coating materials in the fields of material processing, metallurgy, machinery, chemical industry, etc., in particular to a dual-hard-phase dual-bonded phase metal carbide ceramic powder with a core-shell structure and a preparation method thereof. Background technique [0002] In the total amount of scrapped parts caused by surface failure, wear accounts for about 60-80% of the total surface failure of parts, causing huge economic losses. Since wear usually starts from the surface, applying a coating with both high wear resistance and good toughness to the metal surface has become one of the main ways to prolong the life of metal parts. [0003] Among many wear-resistant materials, cermet is composed of metal (or alloy) binder phase and ceramic particles, which not only has certain strength and toughness, but also has high hardness and high wear resistance, and has been widely used in metal cutting, molds and other b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/065B22F1/12B22F1/17C23C4/06
CPCC23C4/06B22F1/065B22F1/17
Inventor 纪岗昌白小波张梦贤陈清宇姚海龙王洪涛杨超
Owner JIUJIANG UNIV