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Laser-cladding MoB/CoCr metal ceramic coating and preparation method thereof

A metal-ceramic coating, laser cladding technology, applied in the direction of metal material coating process, coating, etc., to achieve the effect of high wear resistance, high hardness, high corrosion resistance

Inactive Publication Date: 2012-03-21
JIUJIANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Its purpose of the present invention is just to overcome above defect and provide a kind of laser cladding MoB / CoCr cermet coating and preparation method thereof, coating thickness will have bigger improvement, can reach wear-resisting, corrosion-resistant object; It has been greatly improved, there can be no defects such as porosity and cracks in the coating, the coating structure is dense, and the bonding strength is greatly improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Present embodiment adopts 5kW on the No. 45 steel surface of Φ 60 * 35mm, and CO2 laser device carries out laser cladding cermet coating, and its preparation is carried out according to the following steps:

[0021] 1.45 steel surface activation treatment

[0022] Sand blast the surface of No. 45 steel or use 60# sandpaper to roughen the No. 45 steel to remove surface rust to enhance the bonding strength between the surface of No. 45 steel and the cladding layer, then clean with acetone to remove oil stains, and finally Dry at low temperature (<100°C).

[0023] 2. Prepare coating materials and pre-coat

[0024] First, the MoB / CoCr cermet powder with a particle size of 15-45 μm and a chemical composition (by mass percentage) of Co22.5%, Cr19.7%, B9.5%, 1.6%W, and the balance of Mo is placed in a drying oven After drying at about 150°C, stir and mix MoB / CoCr cermet powder and binder evenly to form a paste or paste mixture with a ratio of 3:1 (mass ratio), and evenly coa...

Embodiment 2

[0028] Present embodiment adopts 5kW on the No. 45 steel surface of Φ 60 * 35mm, and CO2 laser device carries out laser cladding cermet coating, and its preparation is carried out according to the following steps:

[0029] 1.45 steel surface activation treatment

[0030] Use 60# sandpaper to roughen the surface of No. 45 steel to remove surface oxides and rust, then wash with acetone to remove oil stains, and air dry naturally.

[0031] 2. Prepare coating materials and pre-coat

[0032] First, the MoB / CoCr cermet powder with a particle size of 15-45 μm and a chemical composition (by mass percentage) of Co22.5%, Cr19.7%, B9.5%, 1.6%W, and the balance of Mo is placed in a drying oven After drying at about 150°C, stir and mix MoB / CoCr cermet powder and binder evenly to form a paste or paste mixture with a ratio of 3:1 (mass ratio), and evenly coat it on the 45 On the steel surface, compaction and surface physical leveling are carried out, the thickness of the pre-coated pow...

Embodiment 3

[0036] Present embodiment adopts 5kW on the No. 45 steel surface of Φ 60 * 35mm, and CO2 laser device carries out laser cladding cermet coating, and its preparation is carried out according to the following steps:

[0037] 1.45 steel surface activation treatment

[0038] Use 60# sandpaper to roughen the surface of No. 45 steel to remove surface oxides and rust, then wash with acetone to remove oil stains, and air dry naturally.

[0039] 2. Prepare coating materials and pre-coat

[0040] First, the MoB / CoCr cermet powder with a particle size of 15-45 μm and a chemical composition (by mass percentage) of Co22.5%, Cr19.7%, B9.5%, 1.6%W, and the balance of Mo is placed in a drying oven After drying at about 150°C, stir and mix MoB / CoCr cermet powder and binder evenly to form a paste or paste mixture with a ratio of 3:1 (mass ratio), and evenly coat it on the 45 On the steel surface, compaction and surface physical leveling are carried out, the thickness of the pre-coated pow...

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Abstract

The invention provides a preparation method for a laser-cladding MoB / CoCr metal ceramic coating. MoB / CoCr metal ceramic is used as a coating material, wherein the MoB / CoCr metal ceramic comprises the following components in percentage by weight: 22.5 percent of Co, 19.7 percent of Cr, 9.5 percent of B, 1.6 percent of W and the balance of Mo. The preparation method has the advantages that: the inner part of the prepared laser-cladding MoB / CoCr metal ceramic coating is compact and free of air voids, cracks and the like; and the coating is hundreds of microns thick. During laser cladding, argon is adopted, so the coating material cannot be damaged by burning; therefore, the original high hardness, high abrasion resistance and high corrosion resistance of the coating material can be retained.

Description

technical field [0001] The invention belongs to the technical field of cermet composite coatings, and in particular provides a laser cladding MoB / CoCr cermet coating and a preparation method thereof. Background technique [0002] The process methods for preparing cermet coatings on metal surfaces mainly include thermal spraying, spray welding, self-propagating sintering synthesis, and vapor deposition (including physical vapor deposition PVD and chemical deposition CVD). The main problems of vapor deposition are that the equipment is expensive and the deposition speed is slow. Generally, only a coating with a thickness of several to tens of microns can be obtained, and the prepared cermet coating will produce cracks during thermal cycles. Self-propagating sintering has the problem of poor compactness of the coating if no pressure is applied. Spray welding method is difficult to prepare cermet coating with high volume fraction of hard particles, and it is difficult to enhanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C22C32/00
Inventor 陈枭李丹白小波林厚勤
Owner JIUJIANG UNIVERSITY
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