CN103639403A - Special cobalt-based alloy powder for continuous wave fiber laser cladding - Google Patents

Special cobalt-based alloy powder for continuous wave fiber laser cladding Download PDF

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CN103639403A
CN103639403A CN201310589796.4A CN201310589796A CN103639403A CN 103639403 A CN103639403 A CN 103639403A CN 201310589796 A CN201310589796 A CN 201310589796A CN 103639403 A CN103639403 A CN 103639403A
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alloy powder
continuous wave
cobalt
fiber laser
based alloy
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CN103639403B (en
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徐立云
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Changzhou Tianzheng Industrial Development Co ltd
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Abstract

The invention discloses a special cobalt-based alloy powder for continuous wave fiber laser cladding. The special cobalt-based alloy powder for continuous wave fiber laser cladding contains, by weight, 8-12% of silicon nitride, 2-5% of antimony, 4-5% of boron, 3-5% of silicon, 5-8% of aluminum oxide, 1-2% of carbon and the balance of cobalt and inevitable impurities. The cobalt-based alloy powder is specially used for the cladding process of a continuous wave fiber laser, and a metal cladding layer which is compact in texture and high in hardness, toughness and corrosion resistance and does not have the defects of air holes, cracks, hole shrinking and the like can be formed on the surface of a tool and mold of base materials. Moreover, the technology is simple and environmentally friendly, and pre-heat treatment and post-heat treatment are not needed.

Description

Be exclusively used in the Co-based alloy powder of continuous wave optical-fiber laser cladding
Technical field
The present invention relates to a kind of alloy powder, be especially exclusively used in the Co-based alloy powder of continuous wave optical-fiber laser cladding.
Background technology
The principle of laser melting coating utilizes high energy laser beam to irradiate metal material exactly, makes its surface form laser molten pool, fills in new interpolation material simultaneously, treats that laser is cooling in the lump after inswept, forms thus the new cladding layer of one deck in metal surface.
Yet, on domestic market, almost there is no the metal dust of continuous wave optical-fiber laser cladding special use, common used alloy powder is mostly the metal alloy powders that is exclusively used in carbon dioxide laser.Because two kinds of sharp light wavelengths are different, carbon dioxide laser alloy powder used is directly used in after the cladding of continuous wave optical-fiber laser, laser absorption rate is lower, and easily there is the defects such as crackle, shrinkage porosite, shrinkage cavity, pore in cladding layer, for example in most self-fluxing alloy powders, the content of boron and silicon is higher, make some in laser cladding process be mingled with as borosilicate cannot be smoothly from emersion in the molten bath of rapid solidification, cause laser cladding layer cracking sensitivity large, when laser cladding layer hardness is high, cracking phenomena is particularly evident.Therefore, be necessary to develop a kind of metal alloy powders that is specifically designed to the cladding of continuous wave optical-fiber laser.
Summary of the invention
Technical problem to be solved by this invention is: the Co-based alloy powder that is exclusively used in the cladding of continuous wave optical-fiber laser is provided, this Co-based alloy powder is exclusively used in the cladding process of continuous wave optical fiber laser, can form one deck dense structure on the tool and mould surface of base material, the defects such as pore-free, crackle, shrinkage cavity, have the Metal Melting coating of high rigidity, high tenacity, highly corrosion resistant.And technique is simple, environmental protection, without heat treatment in advance and heat treatment afterwards.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is: be exclusively used in the Co-based alloy powder of continuous wave optical-fiber laser cladding, by its weight percent meter, contain 8-12% silicon nitride, 2-5% antimony, 4-5% boron, 3-5% silicon, 5-8% aluminium oxide, 1-2% carbon, surplus is cobalt.
The optimum ratio that is exclusively used in the Co-based alloy powder of continuous wave optical-fiber laser cladding is, comprises 9% silicon nitride, 4% antimony, and 5% boron, 3% silicon, 5% aluminium oxide, 1% carbon, surplus is cobalt.
The effect of the various compositions in metal alloy powders of the present invention:
Cobalt (Co) element: as the aggregate of alloy powder, thorough melting when cladding, together forms laser molten pool with the metal base of molten condition is uniformly distributed after coagulation for other elements or compound and becomes cladding layer in molten bath.
Silicon nitride (SiN 4): as adding material, silicon nitride has higher hardness and wearability, can improve hardness and the wearability of cladding layer metal; In addition, silicon nitride also plays deoxidation voluntarily and slag making, and silicon nitride can also be controlled dilution factor, improves the utilization rate of powder.
Antimony (Sb): fusing point is low, can be used for reducing the fusing point of alloy powder, thereby can reduce energy output.
Boron (B): play deoxidation voluntarily and slag making in alloy powder, can preferentially form borate with the oxygen element that enters molten bath, be covered in weld pool surface, prevent liquid metal over oxidation, low-alloyed fusing point can also fall, improve the wettability of melt to parent metal, the mobility of alloy and surface tension produce favorable influence.
Aluminium oxide (Al 2o 3): linear expansion coefficient is lower, can reduce the coefficient of thermal expansion of powder, reduces cracking sensitivity, improves the absorptivity of laser.
Carbon (C): for improving hardness and the wearability of material.
Beneficial effect of the present invention is: cobalt-based metal alloy powder of the present invention, in the cladding of continuous wave optical-fiber laser, has good thermal absorptivity to wavelength (960 nanometer~1.06 micron) for laser; In laser molten pool, although middle body temperature is higher, thermal conductivity is good, can be rapidly to molten bath four limits conduct heat; Liquid metal is stronger to the wettability of base material, the cladding layer compact structure finally forming, and the defects such as flawless, shrinkage cavity and porosity, pore, have the excellent metallography performance such as high rigidity, high-plasticity, highly corrosion resistant; Technique is simple, without heat treatment in advance and heat treatment afterwards.
Specific embodiment is described specific embodiments of the present invention in detail below by embodiment.
Embodiment mono-:
To be 8% silicon nitride by weight percentage, 2% antimony, 4% boron, 3% silicon, 5% aluminium oxide, 1% carbon, surplus is cobalt, nominal is got 500g sample, obtains 200-300 object cobalt-based metal alloy powder after sample preparation.
Embodiment 2
To be 12% silicon nitride by weight percentage, 5% antimony, 5% boron, 5% silicon, 8% aluminium oxide, 2% carbon, the ratio that surplus is cobalt takes 500g sample, obtains 200-300 object cobalt-based metal alloy powder after sample preparation.
Embodiment 3
To be 9% silicon nitride by weight percentage, 4% antimony, 5% boron, 3% silicon, 5% aluminium oxide, 1% carbon, surplus is cobalt, nominal is got 500g sample, obtains 200-300 object cobalt-based metal alloy powder after sample preparation.
The cobalt-based metal alloy powder being obtained by embodiment 3 preparations, at 2000W continuous wave optical-fiber laser power, spot size 10mm 2, sweep speed 15mm/s, under the process conditions such as powder feeding rate 20g/min, the surface of the work that is No. 45 steel to base material carries out Laser Cladding Treatment, and under room temperature, testing result is as shown in the table:
Figure BDA0000418595490000041

Claims (2)

1. be exclusively used in the Co-based alloy powder of continuous wave optical-fiber laser cladding, by its weight percent meter, contain 8-12% silicon nitride, 2-5% antimony, 4-5% boron, 3-5% silicon, 5-8% aluminium oxide, 1-2% carbon, surplus is cobalt.
2. the Co-based alloy powder that is exclusively used in the cladding of continuous wave optical-fiber laser as described in claim 1, is characterized in that: comprise 9% silicon nitride, and 4% antimony, 5% boron, 3% silicon, 5% aluminium oxide, 1% carbon, surplus is cobalt.
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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5902498A (en) * 1994-08-25 1999-05-11 Qqc, Inc. Methods of joining metal components and resulting articles particularly automotive torque converter assemblies
JP2008141011A (en) * 2006-12-01 2008-06-19 Hitachi Powdered Metals Co Ltd Amorphous dust core
CN101486136A (en) * 2009-02-27 2009-07-22 浙江省钎焊材料与技术重点实验室 Cu-Sn-Sb silver-free middle-temperature solder and preparation method thereof
CN102650012A (en) * 2012-05-05 2012-08-29 张家港市和昊激光科技有限公司 Special cobalt-based metal ceramic alloy powder for optical fiber laser cladding
CN102990059A (en) * 2012-12-19 2013-03-27 江苏新亚特钢锻造有限公司 Silicide particle reinforced laser-clad high abrasion resistance cobalt-base alloy powder and preparation method thereof
CN102990058A (en) * 2012-12-18 2013-03-27 江苏新亚特钢锻造有限公司 Oxide particle reinforced laser-clad high abrasion resistance cobalt-base alloy powder and preparation method thereof
CN103305833A (en) * 2013-06-18 2013-09-18 江苏和昊激光科技有限公司 Special cobalt-based cermet alloy powder for laser cladding of surface of reamer
CN103302286A (en) * 2013-06-18 2013-09-18 江苏和昊激光科技有限公司 Cobalt-based metal ceramic alloy powder exclusively used in laser cladding of turning tool

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5902498A (en) * 1994-08-25 1999-05-11 Qqc, Inc. Methods of joining metal components and resulting articles particularly automotive torque converter assemblies
JP2008141011A (en) * 2006-12-01 2008-06-19 Hitachi Powdered Metals Co Ltd Amorphous dust core
CN101486136A (en) * 2009-02-27 2009-07-22 浙江省钎焊材料与技术重点实验室 Cu-Sn-Sb silver-free middle-temperature solder and preparation method thereof
CN102650012A (en) * 2012-05-05 2012-08-29 张家港市和昊激光科技有限公司 Special cobalt-based metal ceramic alloy powder for optical fiber laser cladding
CN102990058A (en) * 2012-12-18 2013-03-27 江苏新亚特钢锻造有限公司 Oxide particle reinforced laser-clad high abrasion resistance cobalt-base alloy powder and preparation method thereof
CN102990059A (en) * 2012-12-19 2013-03-27 江苏新亚特钢锻造有限公司 Silicide particle reinforced laser-clad high abrasion resistance cobalt-base alloy powder and preparation method thereof
CN103305833A (en) * 2013-06-18 2013-09-18 江苏和昊激光科技有限公司 Special cobalt-based cermet alloy powder for laser cladding of surface of reamer
CN103302286A (en) * 2013-06-18 2013-09-18 江苏和昊激光科技有限公司 Cobalt-based metal ceramic alloy powder exclusively used in laser cladding of turning tool

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