CN103305832A - Special cobalt-based cermet alloy powder for laser cladding of surface of worm - Google Patents

Special cobalt-based cermet alloy powder for laser cladding of surface of worm Download PDF

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Publication number
CN103305832A
CN103305832A CN2013102417081A CN201310241708A CN103305832A CN 103305832 A CN103305832 A CN 103305832A CN 2013102417081 A CN2013102417081 A CN 2013102417081A CN 201310241708 A CN201310241708 A CN 201310241708A CN 103305832 A CN103305832 A CN 103305832A
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China
Prior art keywords
cobalt
worm
based cermet
worm screw
alloy powder
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CN2013102417081A
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Chinese (zh)
Inventor
柳岸敏
张翀昊
杨健
朱小虎
肖彩梅
王小红
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JIANGSU HEHAO LASER TECHNOLOGY Co Ltd
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JIANGSU HEHAO LASER TECHNOLOGY Co Ltd
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Priority to CN2013102417081A priority Critical patent/CN103305832A/en
Publication of CN103305832A publication Critical patent/CN103305832A/en
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Abstract

The invention discloses special cobalt-based cermet alloy powder for the laser cladding of the surface of a worm. The cobalt-based cermet alloy powder contains the following ingredients in percentage by weight: 12-14% of titanium carbide, 0.1-0.3% of carbon, 3-6% of calcium fluoride, 3-5% of silicon nitride, 4-5% of boron, 3-5% of silicon, 0.8-1.3% of vanadium, 6-7% of ferrum, 18-21% of molybdenum and the balance of cobalt. The cobalt-based cermet alloy powder is special for the laser cladding of the worm and is used for improving the compactness of the metal structure of the surface of the worm, so that the hardness, strength and wear resistance of the worm are improved.

Description

Be exclusively used in the cobalt-based cermet powder of worm screw surface laser cladding
Technical field
The present invention relates to a kind of powdered alloy, refer to especially a kind of cobalt-based cermet powder that is exclusively used in the worm screw surface laser cladding.
Background technology
Laser has high brightness, high directivity, high monochromaticity, high coherency's characteristics, is just used by increasing field now, and laser melting coating is exactly a kind of in the process for treating surface.That summarizes says, the principle of laser melting coating is utilized high energy laser beam irradiation metal material surface exactly, substrate surface is melted rapidly, liquid metal forms a small-scale molten bath, fill in simultaneously new powdered material, in this molten bath, metallic substance originally mixes mutually with the powder that is added, and forms the new liquid-metal layer of one deck.Treat after the laser beam process, liquid-metal layer rapidly cooling forms the solid-state cladding layer of one deck thus in the metallic surface.Worm and wheel cooperates motion and the power that is used for transmitting between the alternating axis, easily occurs the phenomenons such as distortion, wearing and tearing in the worm screw life-time service process.For wear resistance, intensity and the hardness that improves worm screw, generally adopt expensive high performance alloys to make worm screw, cause the cost of worm screw greatly to improve.The metal-powder that is exclusively used in the worm screw laser melting coating is not arranged at present, when reality is used, usually adopt other common metal-powders, this metal-powder conducts heat inhomogeneous with melting, degrees of fusion between metal-powder and the base material is poor, cause a series of defectives such as crackle, shrinkage cavity, pore, the mechanical property of the worm screw behind the laser melting coating does not really reach service requirements yet.
Summary of the invention
Technical problem to be solved by this invention is: a kind of cobalt-based cermet powder that is exclusively used in the worm screw surface laser cladding is provided, this cobalt-based cermet powder is exclusively used in the laser melting coating of worm screw, improve worm screw surface metal dense structure property, thereby improve raising hardness, intensity, the wear resistance of worm screw.
For solving the problems of the technologies described above, technical scheme of the present invention is: be exclusively used in the cobalt-based cermet powder of worm screw surface laser cladding, by weight percentage, comprise the 12-14% titanium carbide, 0.1-0.3% carbon, 3-6% Calcium Fluoride (Fluorspan), 3-5% silicon nitride, 4-5% boron, 3-5% silicon, 0.8-1.3% vanadium, 6-7% iron, 18-21% molybdenum, surplus are cobalt.
Wherein, the cobalt-based cermet powder optimum ratio that is exclusively used in the worm screw surface laser cladding is: comprise 13% titanium carbide, and 0.3% carbon, 6% Calcium Fluoride (Fluorspan), 3% silicon nitride, 5% boron, 3% silicon, 0.8% vanadium, 7% iron, 21% molybdenum, surplus is cobalt.
The effect of each composition is as follows in the cobalt-based cermet powder among the present invention:
Titanium carbide (TiC): belong to metal ceramic powder, be present in the cladding layer as strengthening particulate, can greatly improve cladding layer hardness and intensity, can reduce the susceptibility of cladding layer cracking.
Carbon (C): belong to non-metallic element, carbon content is higher, hardness is just higher, wear resisting property is just better, yield-point and tensile strength raise, but its toughness, plasticity, impact and corrosion resistance can reduce along with the increase of carbon content, so when the selection of C content guarantees that worm screw is satisfied wear resistance in this cermet powder, take into account as much as possible toughness and erosion resistance.
Calcium Fluoride (Fluorspan) (CaF 2): as adding material, the internal stress when solidifying for the minimizing cladding layer defectives such as thermal crack, shrinkage cavity and porosity occur after preventing from solidifying, and improves the compactness of metal inside tissue.
Silicon nitride (SiN 4): exist as the second ceramic particle except titanium carbide (TiC), in cladding process, do not melt, but the thermal absorptivity to laser is large, can accelerate heat dispersing, and as the mitigation of soft metallic element and ultrahigh hardness ceramic particle, strengthen creep resistance, oxidation-resistance improves erosion resistance.
Boron (B): have the grain-boundary strengthening effect, can improve the hardness of cladding layer, intensity can improve the hardening capacity of steel, the normalizing attitude tissue that impels steel by perlite to bainite transformation.
Vanadium (V): the effect that has refined crystalline strengthening and improve resistance to tempering and improve the hardening capacity of material, also can form carbide with carbon, the thermotolerance of cladding layer can be provided.
Silicon (Si): in Self-fusing powder, rise from slag making and provide protection, can preferentially form silicate with the oxygen element that enters the molten bath, be covered in weld pool surface, prevent liquid metal transition oxidation, improve the wetting ability of liquid metal.Ferrite there is larger admittedly molten strengthening effect, silicon energy refine pearlite tissue, still, too high Si is unfavorable to the weldability of steel.
Iron (Fe): identical with the material of worm screw matrix, increase the affinity of liquid metal and matrix, improve the intensity of cladding layer metallurgical binding, make this cermet powder with the surperficial full and uniform fusion of worm screw.
Molybdenum (Mo): as a kind of rare earth element additive, promote grain refining, improve the homogeneity of structure of cladding layer, thereby improve the polishing machine of cladding layer.
Cobalt (Co): as cermet substrate, thorough melting during cladding together forms laser molten pool with the base material of molten state, for other elements or compound in the molten bath evenly the distribution after coagulation become cladding layer, to increase cladding layer hardness.
After having adopted technique scheme, effect of the present invention is: this cobalt-based cermet powder is specifically designed to the laser melting coating on worm screw surface, can fully merge with the worm screw base material, each homogeneous chemical composition is distributed in the cladding layer, situation for the work under bad environment of worm screw, adopt the ultrahigh hardness ceramic particle to improve the hardness on worm screw surface, select again in addition some trace elements to improve worm screw wear resistance and intensity, thereby make worm screw can adapt to various abominable Working environments, increase the service life, when guaranteeing the worm screw mechanical property, reduced cost.
Embodiment
The present invention is described in further detail below by specific embodiment.
Embodiment 1
With the 120g titanium carbide, 1g carbon, 30g Calcium Fluoride (Fluorspan), the 50g silicon nitride, 40g boron, 50g silicon, the 13g vanadium, 60g iron, the 180g molybdenum, the 456g cobalt fully mixes, and obtains 100-200 purpose cobalt-based cermet powder.
Embodiment 2
With the 140g titanium carbide, 2g carbon, 40g Calcium Fluoride (Fluorspan), the 40g silicon nitride, 45g boron, 40g silicon, the 10g vanadium, 65g iron, the 200g molybdenum, the 418g cobalt fully mixes, and obtains 100-200 purpose cobalt-based cermet powder.
Embodiment 3
With the 130g titanium carbide, 3g carbon, 60g Calcium Fluoride (Fluorspan), the 30g silicon nitride, 50g boron, 30g silicon, the 8g vanadium, 70g iron, the 210g molybdenum, the 409g cobalt fully mixes, and obtains 100-200 purpose cobalt-based cermet powder.
The metal alloy powders that mixes among this embodiment 3 powder injection hole by laser head is evenly sprayed, powder feeding direction and the laser beams coaxial of cermet powder, the optical maser wavelength of laser are 1.06 μ m, and output rating is 4000W, travelling speed is 2m/min, and the single track width is 2mm.The worm screw that obtains through laser melting coating carries out mechanical detection and obtains following data: (distance in the following table be lowest surface take cladding layer as base plane, base plane is above for just, base plane is following for bearing)
Figure BDA00003364205200041
Any technician is equal to the technical scheme of replacing or changing according to technical scheme of the present invention and inventive concept and should be fallen within protection scope of the present invention within the technical scope that the present invention discloses.

Claims (2)

1. be exclusively used in the cobalt-based cermet powder of worm screw surface laser cladding, by weight percentage, comprise the 12-14% titanium carbide, 0.1-0.3% carbon, 3-6% Calcium Fluoride (Fluorspan), 3-5% silicon nitride, 4-5% boron, 3-5% silicon, the 0.8-1.3% vanadium, 6-7% iron, the 18-21% molybdenum, surplus is cobalt.
2. the cobalt-based cermet powder that is exclusively used in the worm screw surface laser cladding as claimed in claim 1 is characterized in that: comprise 13% titanium carbide, and 0.3% carbon, 6% Calcium Fluoride (Fluorspan), 3% silicon nitride, 5% boron, 3% silicon, 0.8% vanadium, 7% iron, 21% molybdenum, surplus is cobalt.
CN2013102417081A 2013-06-18 2013-06-18 Special cobalt-based cermet alloy powder for laser cladding of surface of worm Pending CN103305832A (en)

Priority Applications (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106757011A (en) * 2017-01-17 2017-05-31 燕山大学 A kind of laser melting coating reproducing method of worm screw

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3368178B2 (en) * 1997-07-30 2003-01-20 株式会社クボタ Manufacturing method of composite sintered alloy for non-ferrous metal melt
CN1670226A (en) * 2004-03-17 2005-09-21 浙江工业大学 Laser intensifying method on metal surface of water pump parts
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3368178B2 (en) * 1997-07-30 2003-01-20 株式会社クボタ Manufacturing method of composite sintered alloy for non-ferrous metal melt
CN1670226A (en) * 2004-03-17 2005-09-21 浙江工业大学 Laser intensifying method on metal surface of water pump parts
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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106757011A (en) * 2017-01-17 2017-05-31 燕山大学 A kind of laser melting coating reproducing method of worm screw

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Application publication date: 20130918