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A high-speed electric arc sprayed nickel-based amorphous nanocrystalline anti-friction coating powder core wire

An amorphous nanocrystalline and arc spraying technology, applied in coating, metal material coating process, melt spraying and other directions, can solve the problems of poor oxidation resistance and corrosion resistance, and achieve low porosity and high bonding strength. Effect

Active Publication Date: 2014-10-22
ACADEMY OF ARMORED FORCES ENG PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem of poor anti-oxidation and anti-corrosion properties of traditional high-speed arc spraying wear-resistant coatings, the present invention provides a powder core wire material for preparing Ni-based amorphous nanocrystalline composite coatings by high-speed arc spraying, which is characterized in that , the powder core wire material adopts pure Ni sheath to wrap the powder core, wherein the powder core accounts for 27-40% by mass of the wire material, and the content ranges of each component of the powder core account for the mass percentage of the wire material are as follows: metal Cr: 3-5%; B-Cr alloy: 10-12%; Si-Fe alloy: 2-5%; Mo: 10-15%; BaF 2 ·CaF 2 Eutectic powder: 0-10%

Method used

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  • A high-speed electric arc sprayed nickel-based amorphous nanocrystalline anti-friction coating powder core wire
  • A high-speed electric arc sprayed nickel-based amorphous nanocrystalline anti-friction coating powder core wire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Choose Ni tape with a width of 10mm and a thickness of 0.3mm, and tie it into a U shape first. Take the composition of the mixed powder of -80~+100 mesh: Cr: 3%, B-Cr: 12%, Mo: 15%, Si-Fe alloy: 5.0%; after weighing according to mass percentage, use a powder mixer to mechanically mix 0.5 h. Put it into the U-shaped groove at a filling rate of 35%, then close the U-shaped groove, and then draw and reduce the diameter to make a Φ2.0 powder core wire. High velocity arc spraying is used to prepare a 0.8mm thick coating on the 20G mild steel substrate. The cross-sectional SEM appearance is as follows figure 1 Shown. The spraying parameters are voltage 34V, current 160A, distance 160mm, atomizing air pressure 0.7MPa, and the coating bond strength is >45MPa, and the porosity of the coating is HV750, the content of amorphous phase is about 50% (the coating XRD analysis results are as figure 2 As shown), the Scherrer formula (where the constant is 0.89 and λ is 0.15406 nm) cal...

Embodiment 2

[0015] Choose a Ni tape with a width of 10mm and a thickness of 0.3mm, and tie it into a U shape first. Take the composition of the mixed powder of -80~+100 mesh: Cr: 5%, B-Cr: 10%, Mo: 10%, Si-Fe alloy: 2.0%; after weighing according to mass percentage, use a powder mixer to mechanically mix 0.5 h. Put it into the U-shaped groove at a filling rate of 27%, then close the U-shaped groove, and then draw and reduce the diameter to make a Φ2.0 powder core wire. A coating with a thickness of 1mm is prepared on a 20G mild steel substrate by high-speed arc spraying. The spraying parameters are voltage 34V, current 160A, distance 160mm, atomizing airflow pressure 0.7MPa, and the coating bonding strength>40MPa and coating porosity are obtained. HV700, the amorphous phase content is about 20%. The oxidation resistance of the coating at 750℃ is 15 times that of 20G steel, and its high temperature corrosion resistance is 12 times that of 20G steel. The friction coefficient of the coating ...

Embodiment 3

[0017] Choose Ni tape with a width of 10mm and a thickness of 0.3mm, and tie it into a U shape first. Take the composition of the mixed powder of -80~+100 mesh: metallic Cr: 5%; B-Cr alloy: 10%; Si-Fe alloy: 5%; Mo: 10%; BaF 2 ·CaF 2 Eutectic powder: 10%. After weighing according to the mass percentage, use a powder mixer to mechanically mix for 1 hour, add it to the U-shaped groove at a filling rate of 40%, then close the U-shaped groove, and then draw and reduce the diameter to make a Φ2.0 powder core Wire. High velocity arc spraying is used to prepare a 0.5mm thick coating on a 20G low carbon steel substrate. The spraying parameters are voltage 36V, current 180A, distance 180mm, atomizing airflow pressure 0.7MPa, and the coating bonding strength>40MPa, coating porosity HV600, 30% amorphous phase content. The oxidation resistance of the coating at 750℃ is 10 times that of 20G steel, and the high temperature corrosion resistance is 8 times that of 20G steel. The friction co...

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Abstract

A cored wire of a high-speed electric arc spraying nickel-base amorphous nanocrystalline antifriction coating is characterized in that a core of the cored wire is wrapped by a pure-Ni cover, the mass percent of the core accounting for the wire ranges from 27% to 40%, the core consists of components including, in mass percent, from 3 to 5% of metal Cr, from 10 to 12% of B-Cr alloy, from 2 to 5% of Si-Fe alloy, from 10 to 15% of Mo and from 0 to 10% of BaF2 and CaF2 eutectic powder. In order to resolve the problem that a traditional high-speed electric arc spraying wear-resistant coating is poor in antioxidation and corrosion prevention, the cored wire is reasonable in ingredient design, the nickel-base amorphous nanocrystalline composite antifriction coating with the thickness of 0.5-1mm, low porosity and high bonding strength is prepared on a 20G low-carbon steel matrix by means of high-speed electric arc spraying, the hardness of the coating is larger than HV600, amorphous phase content is 20-50%, antioxidation and wear-resisting antifriction effects of the coating are remarkable, and the cored wire can be used for preparing antioxidative, anti-corrosion, wear-resistant and antifriction coatings with the work environment temperature within 750 DEG C.

Description

Technical field [0001] The invention relates to a powder-cored wire used for preparing Ni-based amorphous nanocrystalline composite anti-friction coatings by high-speed arc spraying, which is mainly used for anti-oxidation, corrosion resistance, wear-resistant anti-friction protective coatings whose working temperature is within 750°C Layer preparation belongs to the field of thermal spraying technology in the discipline of material processing engineering. Background technique [0002] Arc spraying technology has the characteristics of wide range of spraying materials and high efficiency, and is widely used in large-area anti-corrosion and wear-resistant fields. Compared with traditional arc spraying, high-velocity arc spraying greatly increases the speed of atomizing airflow, so that the atomization quality and flying speed of sprayed particles are improved, the coating is denser, and the bonding strength with the substrate is higher. The arc temperature of high-velocity arc sp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/06C23C4/12C22C19/05C22C45/04C23C4/131
Inventor 梁秀兵徐滨士郭永明陈永雄张志彬商俊超
Owner ACADEMY OF ARMORED FORCES ENG PLA