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A powder core wire material for preparing coatings with high amorphous content and its preparation method and application

A powder core wire material and a powder core technology are applied to the powder core wire material for preparing high amorphous content coating and its preparation, and the field of arc spraying materials, which can solve the problem that the coating is difficult to obtain an amorphous structure and the like, and achieves the Dense structure, excellent wear and corrosion resistance, and uniform composition

Active Publication Date: 2019-10-15
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the above-mentioned iron-based amorphous coatings broaden the application range of amorphous alloys to a certain extent, it is difficult to obtain a complete amorphous structure for the prepared coatings due to the limited types of materials and the limitations of many process conditions in thermal spraying technology. It is accompanied by the production of chromium and boride, and some inherent defects (such as pores, oxides, etc.) in the coating also limit the maximum mechanical properties of the iron-based amorphous coating. How to prepare a high amorphous content ( ≥90%) and arc sprayed iron-based amorphous coatings with low defects are still challenging and innovative

Method used

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  • A powder core wire material for preparing coatings with high amorphous content and its preparation method and application
  • A powder core wire material for preparing coatings with high amorphous content and its preparation method and application
  • A powder core wire material for preparing coatings with high amorphous content and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Select a 430 stainless steel strip of 10×0.4mm (10mm in width and 0.4mm in thickness), and tie it into a U shape first. Take the powder core powder containing seven elements by mass percentage: 6wt.% Cr, 5wt.% B, 4wt.% Si, 4wt.% Nb, 12wt.% Mo, 1wt.% C, the balance is Fe, weigh ingredients. Put the obtained core powder into the powder mixer and mix for 4 hours, then put the mixed core powder into the U-shaped stainless steel belt groove, and the filling rate is 37%. Then close the U-shaped groove so that the powder core powder is coated in it, and then gradually reduce the diameter to Φ2mm through the wire drawing die. The arc spray coating was prepared on the steel substrate roughened by sandblasting, the spraying voltage was 34V, the spraying current was 130A, the spraying distance was 200mm, and the spraying air pressure was 0.7MPa.

[0030] Example 1 prepares the cross-sectional morphology of the amorphous coating as figure 1 shown. It can be seen that the coatin...

Embodiment 2

[0032] Select a 430 stainless steel strip of 10×0.4mm (10mm in width and 0.4mm in thickness), and tie it into a U shape first. Get the powder core powder that contains seven kinds of elements by mass percentage: 9wt.%Cr, 5wt.%B, 4wt.%Si, 5wt.%Nb, 10wt.%Mo, 1.5wt.%C, the balance is Fe, carry out Weigh the ingredients. Put the obtained core powder into the powder mixer and mix for 4 hours, then put the mixed core powder into the U-shaped stainless steel belt tank, and the filling rate is 38%. Then close the U-shaped groove, so that the powder core powder is coated in it, and then gradually reduce the diameter to Φ2mm finished wire through the wire drawing die. The arc spray coating was prepared on the steel substrate roughened by sandblasting, the spraying voltage was 35V, the spraying current was 150A, the spraying distance was 200mm, and the spraying air pressure was 0.7MPa.

[0033] The X-ray diffraction pattern of the iron-based amorphous coating prepared in embodiment 2 i...

Embodiment 3

[0035] Select a 430 stainless steel strip of 10×0.4mm (10mm in width and 0.4mm in thickness), and tie it into a U shape first. Get the powder core powder containing seven kinds of elements by mass percentage: 12wt.%Cr, 6wt.%B, 3wt.%Si, 6wt.%Nb, 9wt.%Mo, 2.5wt.%C, the balance is Fe, carry out Weigh the ingredients. Put the obtained powder core powder into the powder mixer and mix for 60 minutes, then put the mixed powder core powder into the U-shaped stainless steel belt groove, and the filling rate is 38%. Then close the U-shaped groove, so that the powder core powder is coated in it, and then gradually reduce the diameter to Φ2mm finished wire through the wire drawing die. The arc spray coating was prepared on the steel substrate roughened by sand blasting, the spraying voltage was 36V, the spraying current was 120A, the spraying distance was 200mm, and the spraying air pressure was 0.7MPa.

[0036] The average bond strength of the amorphous coating prepared in Example 3 is...

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Abstract

The invention discloses a powder core wire material used for preparing a coating with the high amorphous content and a preparation method and application for the powder core wire material. The powdercore wire material is made by wrapping a power core with a 430 stainless steel outer skin, and the powder core is formed by mixing alloy powder of seven elements; and the filling rate of the powder core is 37-39%, and the diameter of the powder core wire material is 2 mm. The powder core wire material has the strong amorphous forming ability, and the high speed arc spraying technology is adopted to form the low-oxide-content, compact, continuous amorphous coating with a certain shape on a cooled steel base body; and the coating has the compact structure, the amorphous content is greater than or equal to 90%, the porosity is less than 2%, the bonding strength of the coating is greater than or equal to 50 MPa, the hardness of the coating is in the range of 1000-1300 HV100, and the coating has excellent abrasion resistance and corrosion resistance comprehensive performance. The powder core wire material can be widely applied to preparation of the large area anticorrosion and abrasion-resistant coating of a steel structure piece and can remarkably prolong the long lasting anticorrosion and abrasion service life of mechanical engineering equipment.

Description

technical field [0001] The invention belongs to the field of professional thermal spraying of material processing engineering, and relates to a powder core wire material and its preparation method and application, specifically an arc spraying material mainly used for preparing large-area protective coatings, that is, a coating material with high amorphous content. Powder core wire material for layer and its preparation method and application. Background technique [0002] Iron-based amorphous alloys are metal materials with long-range disordered atomic structures. Compared with crystalline materials, the unique atomic structure of amorphous alloys endows them with a more uniform structure, no crystal defects such as grain boundaries and segregation, and has high strength and high Hardness, excellent anti-corrosion and wear-resistant properties, it is the metal material with the highest strength and the best corrosion resistance found so far. However, due to the limitation o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/131C23C4/06C22C45/02B22F1/00
Inventor 程江波冯源张秦梁秀兵张保森陈永雄
Owner HOHAI UNIV
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