CN103128421B - Preparation method for iron-based amorphous/nanocrystalline composite coatings - Google Patents
Preparation method for iron-based amorphous/nanocrystalline composite coatings Download PDFInfo
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- CN103128421B CN103128421B CN201310081917.4A CN201310081917A CN103128421B CN 103128421 B CN103128421 B CN 103128421B CN 201310081917 A CN201310081917 A CN 201310081917A CN 103128421 B CN103128421 B CN 103128421B
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Abstract
The invention relates to a preparation method for iron-based amorphous/nanocrystalline composite coatings. The method includes: (1) preparing iron-based amorphous surfacing electrodes: core wires are made of Fe41Co7Cr15Mo14C15B6Y2 (by atomic percentage) iron-based amorphous alloy with the diameter of 2-5mm, the coverings are low-hydrogen-and-sodium, and the quality factor K<b> of the coverings is 0.6; (2) carrying out surfacing on the surface of Q235 steel with a manual arc surfacing method, wherein the technological parameters of the surfacing are as follows: direct current reverse polarity is used, the welding voltage U is 20-30V, the welding current is 40-100A, the welding speed is 5-12.0mm/s, the argon flow is 16-25L/min, and then the iron-based amorphous/nanocrystalline composite coatings are obtained. The method is reliable in principle and convenient to operate. The optimal technological parameters are obtained through exploration, and the iron-based amorphous/nanocrystalline composite coatings prepared with the manual arc surfacing method have good heat stability.
Description
Technical field
The present invention relates to a kind of Fe-based amorphous/preparation method of nanocrystalline composite coating, there is excellent heat endurance, belong to the preparation method field of material.
Background technology
Due to shortrange order, the longrange disorder of its atomic arrangement, there is not the defects such as the crystal boundary of crystalline material, segregation and precipitate, show isotropism in amorphous alloy.This structures shape it there is excellent properties not available for many amorphous metal, as wear-resisting, the decay resistance etc. of high rigidity, high strength and excellence.But non-crystaline amorphous metal because of the metastable state on its structure and thermodynamics and use in thermal stability problems limit its scope of application.Fe-based amorphous alloy not only has higher amorphous formation ability and cost performance, can also obtain amorphous/nanocrystalline composite coating under rational bead-welding technology, and then keeps excellent wear and corrosion behavior, is more suitable for as surface protection coating materials'use.From the performance advantage of Fe-based amorphous alloy, non-crystaline amorphous metal is combined with Modern Surface Engineering-technique for overlaying, preparation has the amorphous/nanocrystalline composite coating of good wear decay resistance, and to the manufacturing reparations again, improve surface of the work performance of parts, the reliability of raising part, increasing the service life has important practical value.But non-equilibrium on the metastable structure of non-crystaline amorphous metal and its thermodynamics, when causing built-up welding can there is crystallization in overlay cladding.How to control the amorphous/nanocrystalline composite coating of bead-welding technology gain of parameter optimum performance, become the problem being badly in need of solving.
At present, heat spraying method is used widely preparing in amorphous/nanocrystalline composite coating, but also there is hot-spraying coating and substrate combinating strength is low, and coating is thin, the deficiencies such as hole.The amorphous formation ability that Fe-based amorphous alloy is stronger, heat endurance and solderability, make to utilize overlaying method to prepare amorphous/nanocrystalline composite coating and become a reality.Built-up welding has easy and simple to handle, the advantage such as deposition area is large, efficiency is high, excellent surface quality, is more suitable for the preparation method as Fe-based amorphous/nanocrystalline composite coating.
Summary of the invention
The object of the present invention is to provide a kind of Fe-based amorphous/preparation method of nanocrystalline composite coating, the method principle is reliable, easy and simple to handle, best bead-welding technology parameter is obtained by exploring, adopt manual electric arc pile up welding method to prepare Fe-based amorphous/nanocrystalline composite coating, there is excellent heat endurance.
For reaching above technical purpose, the invention provides following technical scheme.
A preparation method for Fe-based amorphous/nanocrystalline composite coating, successively following steps:
1) Fe-based amorphous surfacing welding is prepared: its core wire is the Fe of diameter 2 ~ 5mm
41co
7cr
15mo
14c
15b
6y
2(atomic percentage) Fe-based amorphous alloy, its coating adopts low hydorgew sodium type, coating quality coefficient K
b=0.6, described coating is made up of in mass ratio following component: marble 40 ~ 48%, fluorite 20 ~ 30%, titanium dioxide 2 ~ 5%, soda ash 0 ~ 2%, mid-carbon fe-mn 3 ~ 8%, ferrotianium 8 ~ 15%, 45 ferrosilicon 2 ~ 5%, quartz 3 ~ 10%;
2) manual electric arc pile up welding method is adopted to carry out built-up welding on Q235 steel surface, adopt following bead-welding technology parameter: DC reverse connection, weldingvoltage U=20 ~ 30V, welding current I=40 ~ 100A, speed of welding 5 ~ 12.0mm/s, argon flow amount 16 ~ 25L/min, obtains Fe-based amorphous/nanocrystalline composite coating.
Described 1st) preparation of the Fe-based amorphous surfacing welding of step, detailed process is as follows: by Fe
41co
7cr
15mo
14c
15b
6y
2(atomic percentage) Fe-based amorphous alloy as core wire, polishing alignment; Each for described coating component powder is sieved and is dry mixed evenly, the binding agent adding medicinal powder quality 16 ~ 20% mixes, the Baume degrees of described binding agent sodium silicate is 42.5, send into and in extrusion press, coating is wrapped on core wire, then 60 ~ 150 DEG C of low temperature dryings are carried out, 350 ~ 380 DEG C of hyperthermia dryings.
X-ray diffraction peak width method and Scherrer formula is utilized to calculate the content of amorphous of Fe-based amorphous/nanocrystalline composite coating and nanocrystalline size respectively.By differential scanning calorimetry (DSC), THERMAL STABILITY is carried out to Fe-based amorphous/nanocrystalline composite coating.
Compared with prior art, the invention has the advantages that: with the method prepare Fe-based amorphous/nanocrystalline composite coating in maintain most content of amorphous, Heat stability is good; The preparation technology of coating is simple and easy to do.
Accompanying drawing explanation
Fig. 1 is the scanning electron microscope (SEM) photograph of Fe-based amorphous/nanocrystalline composite coating
Fig. 2 is the XRD figure of Fe-based amorphous/nanocrystalline composite coating
Fig. 3 is the DSC test curve of Fe-based amorphous/nanocrystalline composite coating
Detailed description of the invention
Embodiment 1
One, the preparation of the brilliant composite coating of Fe-based amorphous/sodium rice
Prepare Fe-based amorphous surfacing welding: with Fe-based amorphous alloy Fe
41co
7cr
15mo
14c
15b
6y
2(atomic percentage), as core wire, diameter is 2.0mm; Require to carry out Composition Design to coating of build-up welding bar, coating quality coefficient K according to coating performance
b=0.6, the component (mass percent) of coating is as follows: marble 45%, fluorite 26%, titanium dioxide 3%, soda ash 1.5%, mid-carbon fe-mn 3.5%, ferrotianium 12%, 45 ferrosilicon 2%, quartz 7%.
Formulate rational bead-welding technology parameter, carry out built-up welding on the surface at Q235 steel, the brilliant composite coating of obtained Fe-based amorphous/sodium rice.Bead-welding technology parameter is in table 1:
Table 1 is Fe-based amorphous/the bead-welding technology parameter of the brilliant composite coating of sodium rice
Two, the performance test of the brilliant composite coating of Fe-based amorphous/sodium rice
Analyze microstructure phase composition and the heat endurance of the brilliant composite coating of Fe-based amorphous/sodium rice.Fig. 1, Fig. 2 are tissue topography and the XRD analysis result of Fe-based amorphous/nanocrystalline composite coating, and its degree of crystallinity is 20.86%, and the content of amorphous phase is 79.14%, and nanocrystalline crystallite dimension is 40 ~ 60nm.Fig. 3 is the DSC test curve of Fe-based amorphous/nanocrystalline composite coating, records the crystallization temperature T of coating
xit is 747.2 DEG C.
1, the Micro-Structure Analysis of coating:
Utilize Quanta450 type environmental scanning electron microscope and X ' PertProX x ray diffractometer x to carry out contextual analysis of organization to overlay cladding to show, overlay cladding is well shaping, the defect such as pore-free, crackle; The X ray diffracting spectrum of overlay cladding is typical amorphous state diffuse scattering peak, and calculating overlay cladding content of amorphous respectively with X-ray diffraction peak width method and Scherrer formula is 79.14%, is nanocrystallinely of a size of 40 ~ 60nm.
2, the dsc analysis of coating:
Fe-based amorphous/nanocrystalline composite coating is cut into the thin slice of 5mm × 1mm × 1mm, adopt NetzschSTA409PC synchronous solving to carry out dsc analysis to it, heating rate 15K/min; Gained DSC curve as shown in Figure 3.As seen from Figure 3, there is obvious crystallization peak in the DSC curve of overlay cladding, initial crystallization temperature T
x=747.2 DEG C, illustrate that overlay cladding has good heat endurance.
Embodiment 2
Adopt the Fe-based amorphous surfacing welding in embodiment 1, adjustment arc surfacing technological parameter, carry out overlay welding experiment on the surface at Q235 steel, bead-welding technology parameter is in table 2:
Table 2 is Fe-based amorphous/the bead-welding technology parameter of the brilliant composite coating of sodium rice
Obtain shaping good amorphous/nanocrystalline composite coating, its degree of crystallinity is 40.61%, and amorphous content is 59.39%, and nanocrystalline grain size is at about 80nm.
Claims (2)
1. a preparation method for Fe-based amorphous/nanocrystalline composite coating, successively following steps:
1) Fe-based amorphous surfacing welding is prepared: its core wire is the Fe of diameter 2 ~ 5mm
41co
7cr
15mo
14c
15b
6y
2fe-based amorphous alloy, its coating adopts low hydorgew sodium type, coating quality coefficient K
b=0.6, described coating is made up of in mass ratio following component: marble 45 ~ 48%, fluorite 26 ~ 30%, titanium dioxide 3 ~ 5%, soda ash 1.5 ~ 2%, mid-carbon fe-mn 3.5 ~ 8%, ferrotianium 12 ~ 15%, 45 ferrosilicon 2 ~ 5%, quartz 7 ~ 10%;
2) manual electric arc pile up welding method is adopted to carry out built-up welding on Q235 steel surface, adopt following bead-welding technology parameter: DC reverse connection, weldingvoltage U=22 ~ 30V, welding current I=50 ~ 100A, speed of welding 8 ~ 12.0mm/s, argon flow amount 20 ~ 25L/min, obtains Fe-based amorphous/nanocrystalline composite coating.
2. the preparation method of composite coating as claimed in claim 1, it is characterized in that, the preparation process of described Fe-based amorphous surfacing welding is as follows: by Fe
41co
7cr
15mo
14c
15b
6y
2fe-based amorphous alloy as core wire, polishing alignment; Each for described coating component powder is sieved and is dry mixed evenly, the binding agent adding medicinal powder quality 16 ~ 20% mixes, the Baume degrees of described binding agent sodium silicate is 42.5, send into and in extrusion press, coating is wrapped on core wire, then 60 ~ 150 DEG C of low temperature dryings are carried out, 350 ~ 380 DEG C of hyperthermia dryings.
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| CN105220084B (en) * | 2015-11-10 | 2017-05-10 | 中国石油集团渤海钻探工程有限公司 | Iron-based amorphous nanocrystalline composite coating and preparation method thereof |
| CN107009048B (en) * | 2017-04-24 | 2019-01-25 | 南昌航空大学 | A kind of Fe-based amorphous welding material of Twin wire arc built-up welding |
| CN109023356B (en) * | 2018-09-30 | 2020-01-03 | 山东大学 | Research on Q235 steel argon arc cladding FeCoCrMoCBY alloy coating |
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| JPS6224916A (en) * | 1985-07-22 | 1987-02-02 | Masahiko Suzuki | Formation of outer surface layer by electric discharge machining with use of melalloid electrode |
| WO2011035193A1 (en) * | 2009-09-17 | 2011-03-24 | Scoperta, Inc. | Compositions and methods for determining alloys for thermal spray, weld overlay, thermal spray post processing applications, and castings |
| CN102275049A (en) * | 2011-08-01 | 2011-12-14 | 江西恒大高新技术股份有限公司 | Amorphously structured overlaying flux cored welding wire |
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