A kind of high-performance metal-ceramic composite powder used as thermal spraying structure feeding material and its preparation method

A metal-ceramic composite, high-performance technology, applied in metal processing equipment, metal material coating technology, coating and other directions, can solve the problem of nano powder with large specific surface area, easy adsorption on the wall of the powder feeding tube, small particle size of nano powder, etc. problems, to achieve the effect of low powder utilization, wide particle size distribution and high compactness

Inactive Publication Date: 2020-02-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nano-powders cannot be directly used for thermal spraying, mainly because: 1) The particle size of nano-powders is too small, and it is easy to be burned during thermal spraying; 2) Nano-powders have large specific surface area, high chemical activity, and are easy to adsorb on the powder feeding tube wall, causing difficulty in feeding powder or even blocking the gun

Method used

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  • A kind of high-performance metal-ceramic composite powder used as thermal spraying structure feeding material and its preparation method
  • A kind of high-performance metal-ceramic composite powder used as thermal spraying structure feeding material and its preparation method
  • A kind of high-performance metal-ceramic composite powder used as thermal spraying structure feeding material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] A method for preparing a high-performance cermet nanocomposite powder used as a thermal spraying structure feed, i.e. a nanocomposite structure feed, comprising the following steps:

[0057] 1) 40wt.%TiB 2 Powder (median particle diameter D50=3~5 μ m, purity 99.5%) and 60wt.% NiCrCoAlY powder (NiCrCoAlY nickel-based commercial spray powder (-320 / +500 mesh fine powder) produced by Chengdu Daguang Thermal Spray Material Co., Ltd.) Put into the mixer and pre-mix for 12h, the speed of the mixer is 80r / min, to obtain NiCrCoAlY-TiB 2 mixed powder;

[0058] 2) NiCrCoAlY-TiB obtained in step 1) 2 Put the mixed powder and GCr15 balls into the ball mill, GCr15 balls and NiCrCoAlY-TiB 2 The mass ratio of mixed powder is 1:10, and add dehydrated alcohol as process control agent, wherein, dehydrated alcohol and NiCrCoAlY-TiB 2 The mass ratio of the mixed powder is 0.6:1. In the atmosphere of high-purity argon as the protective gas, the KEQ-2L omnidirectional planetary ball mill ...

Embodiment 2

[0065] A method for preparing a high-performance cermet nanocomposite powder used as a thermal spraying structure feed, i.e. a nanocomposite structure feed, comprising the following steps:

[0066] 1) 40wt.%TiB 2 The powder and 60wt.% NiCrCoAlY powder are put into the blender and pre-mixed for 12h, and the speed of the blender is 80r / min to obtain NiCrCoAlY-TiB 2 mixed powder;

[0067] 2) NiCrCoAlY-TiB obtained in step 1) 2 Put the mixed powder and GCr15 balls into the ball mill, GCr15 balls and NiCrCoAlY-TiB 2 The mass ratio of mixed powder is 1:10, and add dehydrated alcohol as process control agent, wherein, dehydrated alcohol and NiCrCoAlY-TiB 2 The mass ratio of the mixed powder is 0.3:1. In the atmosphere of high-purity argon as the protective gas, use KEQ-2L omni-directional planetary ball mill to carry out wet milling for 12 hours, and the speed of the ball mill is 350r / min to obtain composite powder A;

[0068] 3) Put the composite powder A obtained in step 2) int...

Embodiment 3

[0074] A method for preparing a high-performance cermet nanocomposite powder used as a thermal spraying structure feed, i.e. a nanocomposite structure feed, comprising the following steps:

[0075] 1) 40wt.%TiB 2 The powder and 60wt.% NiCrCoAlY powder are put into the blender and pre-mixed for 12h, and the speed of the blender is 80r / min to obtain NiCrCoAlY-TiB 2 mixed powder;

[0076] 2) NiCrCoAlY-TiB obtained in step 1) 2 Put the mixed powder and GCr15 balls into the ball mill, GCr15 balls and NiCrCoAlY-TiB 2 The mass ratio of mixed powder is 1:10, and add dehydrated alcohol as process control agent, wherein, dehydrated alcohol and NiCrCoAlY-TiB 2 The mass ratio of the mixed powder is 0.3:1. In the atmosphere of high-purity argon as the protective gas, use KEQ-2L omni-directional planetary ball mill to carry out wet milling for 12 hours, and the speed of the ball mill is 350r / min to obtain composite powder A;

[0077] 3) Put the composite powder A obtained in step 2) int...

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Abstract

The invention belongs to the technical field of nanocomposite materials, and discloses a high-performance cermet composite powder used as a feed material for thermal spraying structures and a preparation method thereof. Described method is: (1) with 20~40wt.%TiB 2 Mix the powder with 60-80wt.% NiCrCoAlY powder evenly to get NiCrCoAlY‑TiB 2 Mixed powder; (2) NiCrCoAlY‑TiB 2 The mixed powder and process control agent are placed in a ball mill, wet-milled in an inert gas atmosphere, dried, and cooled to obtain a composite powder; (3) in an inert gas atmosphere, the composite powder is ball-milled and plasma spheroidized to obtain High-performance cermet nanocomposite powder. The composite powder has the properties of high temperature wear resistance, thermal fatigue resistance, corrosion resistance and high temperature oxidation resistance, good fluidity and density, and the particle size is still mainly concentrated in 5-50 μm; the preparation method is simple and easy to operate, and is environmentally friendly.

Description

technical field [0001] The invention belongs to the field of nanocomposite materials, in particular to a high-performance cermet composite powder (NiCrCoAlY-TiB 2 Composite powder) and its preparation method. Background technique [0002] In my country's natural energy, coal accounts for a considerable proportion, about 77%, which to a certain extent determines its attribute of the main force of energy consumption, accounting for about 70% of natural energy consumption, while the coal consumed for power generation The amount can reach half of its total consumption, among which thermal power generation is the main form of power generation in my country, accounting for more than 80% of the total power generation in the country. Therefore, the safe operation of thermal power generating units is very important. The primary task to ensure the safe and economical operation of thermal power generating units is to reduce the forced shutdown accidents of the units. The superheater ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/04B22F1/00C23C4/06C23C4/129
CPCC23C4/06C23C4/129B22F9/04B22F2009/043B22F1/14
Inventor 车晓舟王记中曾德长
Owner SOUTH CHINA UNIV OF TECH
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