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Nanometer composite structure feed and preparing method thereof

A nano-composite and feeding technology, applied in metal material coating process, melt spraying, coating and other directions, can solve the problems of large specific surface area of ​​nano powder, easy adsorption on the wall of powder feeding tube, small particle size of nano powder, etc. , to achieve the effect of simple preparation method, easy operation of preparation method and excellent performance

Active Publication Date: 2016-09-28
GUANGDONG ZHENGDE MATERIAL SURFACE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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  • Nanometer composite structure feed and preparing method thereof
  • Nanometer composite structure feed and preparing method thereof
  • Nanometer composite structure feed and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A nanocomposite structure feed, made of TiB 2 and NiCrCoAlY by high-energy ball milling reaction, where TiB 2 The mass ratio to NiCrCoAlY is 1:1.5.

[0043] A method for preparing a nanocomposite structure feed, comprising the following steps:

[0044] 1) Convert TiB 2 The powder and the NiCrCoAlY powder are put into the mixer for pre-mixing for 12h according to the mass ratio of 1:1.5, and the speed of the mixer is 80r / min to obtain NiCrCoAlY-TiB 2 mixed powder;

[0045] 2) The 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 the mixed powder is 1:10, and absolute ethanol is added as a process control agent, wherein, the mass ratio of absolute ethanol to the mixed powder is 0.6:1, in the atmosphere of high-purity argon as the protective gas, KEQ - 2L omni-directional planetary ball mill for wet milling for 20 hours, the speed of the ball mill is 350r / min, to obtain compo...

Embodiment 2

[0054] The operation of Example 2 is different from that of Example 1 in that: the wet milling time in step 2) is 18 hours, and the mass ratio of the process control agent absolute ethanol to the mixed powder is 0.3:1.

[0055] The as-prepared NiCrCoAlY-TiB was observed by SEM 2 The microscopic morphology of the nanocomposite structure feeding material, the obtained results are as follows Image 6 shown.

[0056] The prepared nano-NiCrCoAlY-TiB 2 The feed material of the composite structure is approximately spherical, has excellent fluidity, and can be directly used for supersonic flame (HVOF) spraying.

Embodiment 3

[0058] The operation of Example 3 is different from that of Example 1 in that: the wet grinding time in step 2) is 16 hours.

[0059] The as-prepared NiCrCoAlY-TiB was observed by SEM 2 The microscopic morphology of the nanocomposite structure feeding material, the obtained results are as follows Figure 7 shown.

[0060] The prepared nano-NiCrCoAlY-TiB 2 The feed material of the composite structure is approximately spherical, has excellent fluidity, and can be directly used for supersonic flame (HVOF) spraying.

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Abstract

The invention discloses nanometer composite structure feed. The nanometer composite structure feed is prepared through the reaction of TiB2 and NiCrCoAlY via a high energy ball milling method. The mass ratio of the TiB2 to the NiCrCoAlY is 1:1.2-2. A preparing method comprises the following steps that firstly, TiB2 powder and NiCrCoAlY powder are premixed, and mixed powder is obtained; secondly, the mixed powder is subjected to wet milling, and composite powder A is obtained; thirdly, the composite powder A is dried, and dried composite powder A is obtained; fourthly, the dried composite powder A is subjected to dry grinding, and dried composite powder B is obtained; and fifthly, the dried composite powder B is filtered, and the nanometer composite structure feed is obtained. The prepared nanometer NiCrCoAlY-TiB2 composite structure feed is good in composite effect, excellent in mobility and capable of being directly used for high velocity oxygen fuel (HVOF) coating. The preparing method is simple and easy to operate and friendly to the environment. The various properties of the prepared NiCrCoAlY-TiB2 composite structure feed are excellent.

Description

technical field [0001] The invention belongs to the field of nanocomposite materials, in particular to a nanometer NiCrCoAlY-TiB 2 Composite structure feed and its preparation method. Background technique [0002] WC is easy to decompose under high temperature oxidation conditions, and WC coating is difficult to apply to wear-resistant occasions above 450 °C; Cr 3 C 2 The service temperature of the coating can reach 900°C, but Cr 3 C 2 The intrinsic hardness is low, and the wear resistance is not ideal. TiB 2 Due to its ultra-high hardness (microhardness 34GPa), high melting point (2980°C), excellent resistance to high temperature oxidation (1000°C in air), it has excellent wear resistance, corrosion resistance and high temperature resistance. TiB 2 -M Metal-ceramic composite coatings have been considered as one of the best candidate coating materials to replace traditional coatings in high temperature and wear-resistant applications at 450°C-1000°C. [0003] TiB 2 I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/06C23C4/129B22F9/04
CPCB22F9/04B22F2009/043C23C4/06
Inventor 曾德长吴姚莎王记中
Owner GUANGDONG ZHENGDE MATERIAL SURFACE TECH
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