Cored wire of high-speed electric arc spraying nickel-base amorphous nanocrystalline antifriction coating

An amorphous nanocrystalline and arc spraying technology, used in coatings, metal material coating processes, 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: 2012-08-22
ACADEMY OF ARMORED FORCES ENG PLA
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 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 , t...

Method used

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  • Cored wire of high-speed electric arc spraying nickel-base amorphous nanocrystalline antifriction coating
  • Cored wire of high-speed electric arc spraying nickel-base amorphous nanocrystalline antifriction coating
  • Cored wire of high-speed electric arc spraying nickel-base amorphous nanocrystalline antifriction coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Choose a Ni strip with a width of 10mm and a thickness of 0.3mm, and tie it into a U shape first. The composition of the mixed powder from -80 to +100 mesh: Cr: 3%, B-Cr: 12%, Mo: 15%, Si-Fe alloy: 5.0%; after weighing according to the mass percentage, use a powder mixer to mix 0.5% h, according to the filling rate of 35%, put it into the U-shaped groove, then close the U-shaped groove, and then draw it through a wire drawing die and reduce the diameter to make a powder core wire material of Φ2.0. A coating with a thickness of 0.8 mm was prepared on a 20G low-carbon steel substrate by high-speed arc spraying. The SEM morphology of the cross-section is as follows figure 1 shown. Spraying parameters are voltage 34V, current 160A, distance 160mm, atomizing airflow pressure 0.7MPa, the obtained coating bonding strength>45MPa, coating porosityHV750, amorphous phase content about 50% (Coating XRD analysis results such as figure 2 Shown), using the Scherrer formula (where ...

Embodiment 2

[0016] Choose a Ni strip with a width of 10mm and a thickness of 0.3mm, and tie it into a U shape first. The composition of the mixed powder from -80 to +100 mesh: Cr: 5%, B-Cr: 10%, Mo: 10%, Si-Fe alloy: 2.0%; after weighing according to the mass percentage, use a powder mixer to mix 0.5% h, according to the filling rate of 27%, put it into the U-shaped groove, then close the U-shaped groove, and then draw it through a wire drawing die and reduce the diameter to make a powder core wire material of Φ2.0. A coating with a thickness of 1mm was prepared on a 20G low-carbon steel substrate by high-speed arc spraying. The spraying parameters were voltage 34V, current 160A, distance 160mm, and atomizing airflow pressure 0.7MPa. The bonding strength of the coating was >40MPa, and the porosity of the coating was HV700, and the amorphous phase content is about 20%. The oxidation resistance of the coating at 750°C is 15 times that of 20G steel, the high temperature corrosion resistance ...

Embodiment 3

[0018] Choose a Ni strip with a width of 10mm and a thickness of 0.3mm, and tie it into a U shape first. The composition of the mixed powder from -80 to +100 mesh: metal 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 mix it mechanically for 1 hour, put it into the U-shaped groove at a filling rate of 40%, then close the U-shaped groove, and then draw it through a wire drawing die and reduce the diameter to make a powder core of Φ2.0 silk. A coating with a thickness of 0.5 mm was prepared on a 20G low-carbon steel substrate by high-speed arc spraying. Spraying parameters are voltage 36V, current 180A, distance 180mm, atomizing airflow pressure 0.7MPa, and obtain coating bonding strength > 40MPa, coating porosity HV600, and amorphous phase content 30%. The oxidation resistance of the coating at 750°C is 10 times that of 20G steel, the high temperature corrosion resi...

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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 core wire material used for high-speed electric arc spraying to prepare Ni-based amorphous nanocrystalline composite anti-friction coating, which is mainly used for anti-oxidation, corrosion resistance, wear-resistant anti-friction protective coating with working temperature 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, wear-resistant and other fields. Compared with traditional arc spraying, high-speed arc spraying greatly increases the speed of atomizing airflow, so that the atomization quality and flight speed of sprayed particles are improved, the coating is denser, and the bonding strength with the substrate is higher. The arc temperature of hi...

Claims

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Application Information

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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
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