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Aluminum-based amorphous coating with low porosity and high amorphous degree, and preparation device and preparation method thereof

A technology of amorphous coating and preparation device, applied in coating, metal material coating process, melt spraying and other directions, can solve problems such as low porosity and wear resistance, achieve improved heat dissipation, improved utilization rate, strong local resistance Effect of Corrosive Ability

Active Publication Date: 2018-03-06
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, iron-based amorphous coatings prepared by HVAF have the advantages of low porosity, high hardness, high bonding strength between coating and substrate, and good wear resistance. However, for the preparation of aluminum-based amorphous coatings with extremely low forming ability, How to ensure that the cooling rate of the liquid flow exceeds the critical value, obtain an aluminum-based amorphous coating with high amorphousness, and at the same time ensure that the aluminum-based amorphous coating has low porosity and high wear resistance, etc., has always been an important issue for aluminum-based amorphous alloys. Difficulties in coating preparation

Method used

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  • Aluminum-based amorphous coating with low porosity and high amorphous degree, and preparation device and preparation method thereof
  • Aluminum-based amorphous coating with low porosity and high amorphous degree, and preparation device and preparation method thereof
  • Aluminum-based amorphous coating with low porosity and high amorphous degree, and preparation device and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] In this embodiment, the aluminum-based amorphous coating with low porosity and high amorphousness is prepared by using the above-mentioned spraying equipment. In this embodiment, the spraying parameters in the traditional spraying process are used when spraying, for example, the spraying distance is 175mm, and the powder feeding rate is 3r / min, surface roughness 11Ra, air 102.5PSI, propane 95PSI. Specific steps are as follows:

[0041] (1) Turn on the rotating rod lifting device, and adjust the height of the connecting shaft between the rotating rod and the substrate to be flush with the center of the spray gun;

[0042] (2) Turn on the rotation device, set the rotation speed of the substrate, and adjust the rotation linear speed (the linear speed at the connection between the connecting rod and the substrate) to 800mm / s;

[0043] (3) Set the spraying temperature, powder feeding rate, spraying distance and gas pressure, etc., and adjust the best spraying process;

[0...

Embodiment 2

[0049] The difference from Example 1 is that when the rotational angular velocity of the rotating rod is 14rad / s, that is, when the linear velocity is 700mm / s, the Al-based amorphous coating prepared has more pores and the finally obtained sample has low amorphousness. Such as Figure 4 shown.

Embodiment 3

[0051] The difference from Example 1 is that when the rotational angular velocity of the rotating rod is 12rad / s, that is, when the linear velocity is 600mm / s, the prepared Al-based amorphous coating has more defects, and a large number of crystal phases appear in the finally obtained coating. , the specific analysis is as Figure 5 shown.

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Abstract

The invention discloses an aluminum-based amorphous coating with low porosity and high amorphous degree, and a preparation device and a preparation method thereof, and belongs to the technical field of amorphous alloy coatings. The aluminum-based amorphous-nanometer crystal alloy coating is prepared from powder with the particle size of 5-25 [mu]m by an aluminum-based amorphous alloy component system (Al-TM-RE) according to the preparation technology, the cooling speed after high-speed liquid flow collides with base plates in the spray-coating process is increased, the obtained coating has thecharacteristics of high wear resistance and corrosion resistance, the amorphous degree exceeds 85 percent, the coating thickness is 100 to 250 [mu]m, the porosity is less than or equal to 0.5 percent, the bonding strength is more than or equal to 40 MPa, the abrasion loss is less than or equal to 0.25 mm<3> within 5000 s, the coating hardness is more than or equal to 350 HV, the pitting corrosionpotential in a NaCl solution of 3.5 percent by weight is more than or equal to -0.3 VSCE, and high local corrosion resistance is achieved.

Description

technical field [0001] The invention relates to the technical field of amorphous coatings, in particular to an aluminum-based amorphous coating with low porosity and high amorphousness, a preparation device and a preparation method thereof. Background technique [0002] As the leader among lightweight metal materials, aluminum alloy materials are widely used in aerospace and military fields. Aluminum alloy materials can greatly reduce the weight of equipment and improve the maneuverability and overall combat performance of equipment. Inexpensive, it is an engineering component material with great market potential, and is deeply loved by scientists from all over the world. [0003] Compared with traditional aluminum alloy materials, aluminum-based amorphous alloys have properties far superior to those of traditional aluminum alloys, such as a series of advantages such as low density, high strength, high toughness, superplasticity and excellent corrosion resistance, and are an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/129C23C4/08C22C45/08
CPCC22C45/08C23C4/08C23C4/129
Inventor 吕威闫杨伯俊高明浩孙文海张锁德王建强
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI