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Preparation method of multi-scale double-interface metal ceramic powder

A cermet and ceramic powder technology, which is applied in the field of multi-scale double-interface cermet powder preparation, can solve the problems of material wear performance restriction, increased wear, decreased toughness, etc., and achieves the effects of good strength and toughness and good wear resistance.

Inactive Publication Date: 2011-03-16
JIUJIANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research on WC-Co cermet materials shows that the size of ceramic particles has different influence trends on its hardness and toughness. When the size of WC particles is reduced from micron to nanometer, the hardness of WC-12Co cermet increases greatly, but the toughness of the material decreases. Under the condition of particle wear, the nano-carbides in the matrix phase are easy to fall off, resulting in aggravated wear. Under different loads and abrasive conditions, the wear performance of the material is restricted by the size of the carbide particles.

Method used

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  • Preparation method of multi-scale double-interface metal ceramic powder
  • Preparation method of multi-scale double-interface metal ceramic powder

Examples

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example 1

[0030] like figure 1 As shown, for the specific multi-scale dual-interface WC-Co cermet powder

[0031] Ball milling: Select conventional micron-sized WC powder (15-45 microns), put the powder into a ball mill tank and use ethanol as a process control agent for wet ball milling, the ball-to-material ratio is 20:1, the speed is 250 rpm, and the ball milling time is 72 hour, 36 hours, 12 hours;

[0032] Sieving: Sieve the above powders milled for different times to obtain nanoscale WC powder (25-50nm), submicron WC powder (300-500nm) and micron WC powder (1-5 microns);

[0033] Coating: Co-coated WC particles were then prepared by electroless plating on the above-mentioned WC powders with different particle sizes. The specific process is as follows: put WC in an anhydrous ethanol solution with a concentration of about 30-60%, ultrasonically clean it for about 15 minutes to obtain WC particles with a clean surface, and soak the purified WC particles in saturated NaCl solu...

example 2

[0038] like figure 1 As shown, for the specific multi-scale dual-interface WC-Ni cermet powder

[0039] Ball milling: Select conventional micron-sized WC powder (15-45 microns), put the powder into a ball mill tank and use argon as a protective gas for dry and wet ball milling. 48 hours, 24 hours, 6 hours;

[0040] Sieving: Sieve the above powders milled for different times to obtain nanoscale nanoscale WC powder (50-80nm), submicron scale WC powder (600-800nm) and micron scale WC powder (5-8μm);

[0041] Coating: Ni-coated WC particles were prepared by electroless plating on the above-mentioned WC powders with different particle sizes. The specific process is as follows: Purify and activate the above-mentioned WC powders with different particle sizes, then take cobalt sulfate with a concentration of 20 g / L, tartaric acid with a concentration of 20 g / L and EDTA with a concentration of 10 g / L and dissolve them in distilled water respectively. Then mix the three solutio...

example 3

[0046] like figure 1 As shown, for the specific multi-scale double-interface TiC-Fe cermet powder

[0047] Ball milling: Select conventional micron-sized TiC powder (15-45 microns), put the powder into a ball mill tank and use ethanol as the process control agent for wet ball milling, the ball-to-material ratio is 20:1, the speed is 200 rpm, and the ball milling time is 72 hour, 36 hours, 12 hours;

[0048] Sieving: Sieve the above powders milled for different times to obtain nanoscale TiC powder (25-50nm), submicron WC powder (300-500nm) and micron WC powder (1-5 microns);

[0049] Coating: Fe-coated TiC particles were prepared by electroless plating on the above-mentioned ball-milled TiC powders with different particle sizes. First, purify and activate the above-mentioned TiC powders with different particle sizes, and then take ferrous sulfate with a concentration of 8g / L, sodium hypophosphite with a concentration of 30~40g / L, potassium sodium tartrate with a concent...

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Abstract

The invention discloses a preparation method of multi-scale double-interface metal ceramic powder. The preparation method comprises the following steps of: preparing multi-scale ceramic particles by a mechanical alloying and screening process; preparing metal or alloy-coated multi-scale metal ceramic particles by a coating process; controlling the bonding state of a coated interface by a materialcomposition and thermal treatment process; performing glomeration granulation by matching coated metal ceramic particles with different scales so as to obtain double-interface metal ceramic particles; and performing densification and scale and density double grading so as to obtain metal ceramic powder with a multi-scale double-interface structure. The multi-scale double-interface metal ceramic powder prepared by the method has a double-interface structure in which a ceramic phase is combined with a coated phase and the interface binding between coated particles is controlled and the multi-scale characteristic of controllable scale and density distributions of ceramic particles and powder particles. The powder structure provided by the invention has novel design and high controllability. A metal ceramic material prepared from the powder has high intensity, high toughness and good market application prospect.

Description

technical field [0001] The invention belongs to the field of material processing, and relates to a preparation method of multi-scale double-interface cermet powder. Background technique [0002] Surface wear is the main form of part failure, accounting for about 60-80% of part surface failure. Improving the surface strength and wear resistance of parts is one of the main ways to prolong the life of parts, and improving the hardness and toughness can enhance the surface strength of parts, thus Improve its wear resistance. The ideal material structure is that hard phase particles with high melting point and high hardness are distributed on a tough and continuous matrix. Cermet, which is composed of metal or alloy as the binder phase and ceramic particles, is one of the widely used overall wear-resistant materials and part surface strengthening coating materials. The metal or alloy binder phase ensures the strength and toughness of the cermet, and the hard ceramic particles m...

Claims

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Application Information

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IPC IPC(8): C22C29/00C22C1/04
Inventor 纪岗昌王洪涛宋杰光陈清宇
Owner JIUJIANG UNIVERSITY
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