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Surface modification method for spark plasma sintering type amorphous alloy coating

A discharge plasma and amorphous alloy technology, which is applied in the field of environmental protection, can solve problems affecting coating performance, etc., and achieve the effects of increasing life, reducing holes, and improving performance

Active Publication Date: 2016-11-23
HOHAI UNIV CHANGZHOU
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  • Abstract
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  • Application Information

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Problems solved by technology

Each amorphous alloy preparation method has its own advantages and disadvantages: the water quenching method is simple to operate, simple equipment, and easy to control the process, but it has certain limitations. This method is not suitable for alloy melts that react strongly with quartz tubes.
The preparation of amorphous alloys by spark plasma sintering (SPS) technology can obtain amorphous alloy coatings with amorphous characteristics. However, the amorphous coatings obtained by sintering are mainly in the state of particle aggregation, the internal structure is relatively loose, and there are many holes. significantly affect the performance of the coating

Method used

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  • Surface modification method for spark plasma sintering type amorphous alloy coating
  • Surface modification method for spark plasma sintering type amorphous alloy coating
  • Surface modification method for spark plasma sintering type amorphous alloy coating

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Embodiment

[0030] S1, using commercially available Fe 48 Cr 15 Mo 14 Y 2 C 15 B 6 (purity 99.9%, particle size 10-30μm) amorphous powder is used as the experimental raw material, use spark plasma sintering equipment to prepare amorphous coating, keep the equipment under high vacuum pressure, set the pressure between 50-90MPa, and set the temperature to low The crystallization temperature of the amorphous coating is 575°C. A typical preparation cycle is divided into three parts: rapid heating to sintering temperature at a rate of 100°C / min, holding for a certain period of time, and finally using nitrogen purge to achieve rapid cooling. The cylindrical sample obtained by sintering has a height of 10 mm and a diameter of 15 mm.

[0031] S2. Use the YAG energy feedback laser welding machine (model GD-YAG-W200 / W300) produced by Everbright Laser to remelt the sintered amorphous coating by laser; before remelting, use HP-05 ceramic closed constant temperature electric furnace to The samp...

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Abstract

The invention discloses a surface modification method for a spark plasma sintering type amorphous alloy coating. The surface modification method includes the steps of S1, adopting a spark plasma sintering furnace and sintering amorphous powder through an instantaneous high-temperature field generated by the pulse energy, the discharge pulse pressure and the joule heat to obtain a sintered amorphous alloy coating sample; and S2, carrying out laser re-melting on the obtained amorphous alloy coating sample through a laser welding machine to obtain the final amorphous alloy coating. Characterization tests are carried out on the obtained sample and include the steps that XRD characterization is carried out on the sample before and after laser re-melting; the surface appearance of the re-molten sample is observed through a stereoscopic microscope; the surface hardness of the sample after re-melting is measured through a micro-hardness tester; and the microscopic structure of the cross section of the sample is observed through a scanning electron microscope. According to the method, the spark plasma sintering technology and the laser re-melting technology are combined, the amorphous alloy coating surface with higher hardness and strength and better abrasive resistance can be obtained, and therefore the service life of work-pieces can be prolonged.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for modifying the surface of a discharge plasma sintered amorphous alloy coating. Background technique [0002] Amorphous alloy is a new type of metal material with a glass structure and both physical, chemical and mechanical properties of metal materials and glass materials. Amorphous alloy atoms have the characteristics of short-range order and long-range disorder, and the structure does not have the periodic distribution characteristics of crystalline materials. It can be said that its crystal structure is defect-free. Based on this structural feature, the amorphous state has better hardness, strength, and corrosion resistance than conventional crystalline metal materials, and has attracted widespread attention in recent years. [0003] For the preparation of amorphous alloys, the key is to reduce the non-uniform nucleation during the coo...

Claims

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Application Information

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IPC IPC(8): B22F3/14B22F3/105B22F3/24B22F7/04
CPCB22F3/006B22F3/105B22F3/14B22F3/24B22F7/04B22F2007/042
Inventor 纪秀林顾鹏
Owner HOHAI UNIV CHANGZHOU
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