CN105256270A - Preparing method for Fe-Cr-B system amorphous coating with high Cr content and high B content - Google Patents
Preparing method for Fe-Cr-B system amorphous coating with high Cr content and high B content Download PDFInfo
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- CN105256270A CN105256270A CN201510795578.5A CN201510795578A CN105256270A CN 105256270 A CN105256270 A CN 105256270A CN 201510795578 A CN201510795578 A CN 201510795578A CN 105256270 A CN105256270 A CN 105256270A
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Abstract
The invention relates to a preparing method for a Fe-Cr-B system amorphous coating with the high Cr content and the high B content. The preparing method includes the following steps: (a) raw materials are weighed according to the atomic percentage that the atomic percentage of Fe ranges from 50%-55%, the atomic percent of Cr ranges from 15% to 20%, the atomic percent of Mo ranges from 2% to 5%, the atomic percentage of Zr ranges from 5% to 10%, and the atomic percentage of B ranges from 15% to 20%; and the raw materials are added into a vacuum induction melting furnace, and a mother alloy is obtained through casting; (b) the mother alloy is contained in a gas atomization furnace to be heated and melted, the degree of superheat ranges from 300 DEG C to 400 DEG C, and the liquid mother alloy is atomized into amorphous state spherical powder; and (c) the amorphous state spherical powder with the grain size ranging from 15 micrometers to 45 micrometers is taken, the hypersonic flame spraying technology is adopted for preparing the Fe-Cr-B system amorphous coating on a substrate. The coating is a potential neutron absorption, wearing-resistance and corrosion-resistant material, and is expected to be applied to the field of nuclear waste disposal.
Description
Technical field
The present invention relates to a kind of preparation method of amorphous coating, be specifically related to the preparation method of a kind of high Cr and high B content F e-Cr-B system amorphous coating.
Background technology
In numerous non-crystaline amorphous metal system, iron-based non-crystalline alloy is with its cheap cost, and the advantages such as the soft magnetism of outstanding breaking tenacity, hardness, erosion resistance, high temperature resistance and excellence, industrially demonstrate important using value.
Supersonic gas powder by atomization technology is the metal powder preparation technology that a kind of capacity usage ratio is high, rare gas element consumption is little, size range is narrow, its obtained powder good sphericity, quality are good, are applicable to hypersonic flame spraying technology and spray body material.Simultaneously, compared with the coating productions such as chemical vapour deposition, physical vapor deposition, plating, electroless plating, Brush Plating, laser melting coating, hot-spraying techniques has the advantages such as cost is low, efficiency is high, area is large, environmental friendliness, is wear-resisting, the corrosion protection coating preparation method that are most widely used at present.And, hypersonic flame spraying has that flame stream is elongated, concentration of energy, flame velocity higher (4 ~ 5 times of velocities of sound), velocity of particle high (>600m/s), in powder painting process, degree of oxidation is low, microtexture change is little, coating densification, porosity low (<1%), hardness is high, toughness is large, with substrate combinating strength high, coatingsurface is smooth, flexible operation, can the advantage such as continuous spray, be a kind of heat spraying method being suitable for preparing iron-based amorphous coating.But above-mentioned technology has difficulties when preparing high Cr and high B content F e-Cr-B system's amorphous coating.
The U.S. and the Japanese basic research work in early stage for iron-based amorphous coating facilitate the application of iron-based amorphous coating.Within 2003, the advanced research project office (DARPA) of U.S. Department of Defense starts " the advanced amorphous coating of naval " (NavalAdvancedAmorphousCoating-NAAC) plan, for the application of iron-based amorphous coating in ocean environment and nuclear radiation environment, carried out systematic difference research work, wherein most typical two amorphous alloy components are the Fe with high amorphous formation ability respectively
48cr
15mo
14c
15b
6y
2with the Fe of high B content
49.7cr
18.1mn
1.9mo
7.4w
1.6b
15.2c
3.8si
2.4, alloy designations is named as SAM1651 and SAM2X5 respectively.Can find out, these two kinds of amorphous alloy component complexity, the former amorphous formation ability is good, but B content is low; The latter B content is high, but amorphous formation ability is poor, realize industrial application comparatively difficult, equipment of industrial product cost need be improved to prepare high-quality amorphous coating, and then realize iron-based amorphous coating as neutron-absorbing, the wear-resistant and application of corrosion resistant material in nuclear radiation environment.Therefore, need to provide a kind of can prepare high Cr and high B content F e-Cr-B system's amorphous coating and be easy to the method for industrial application.
Summary of the invention
The present invention seeks to the preparation method that a kind of high Cr and high B content F e-Cr-B system amorphous coating are provided to overcome the deficiencies in the prior art.
For achieving the above object, the technical solution adopted in the present invention is: the preparation method of a kind of high Cr and high B content F e-Cr-B system amorphous coating, and it is characterized in that, it comprises the following steps:
A () takes raw material by following atomic percent: Fe is 50 ~ 55%, Cr be 15-20%, Mo be 2-5%, Zr be 5-10%, B is 15 ~ 20%, add in vacuum induction melting furnace, pass into argon gas when vacuum tightness≤0.1Pa, melting raw material also mixes, mother alloy of casting to obtain;
B described mother alloy is placed in heat fused in aerosolization stove by (), make its superheating temperature be 300 ~ 400 DEG C, liquid mother alloy is atomized into non-crystalline state spherical powder;
C () gets the described non-crystalline state spherical powder that particle diameter is 15 ~ 45 μm, adopt hypersonic flame spraying technology in substrate, prepare Fe-Cr-B system amorphous coating, spraying parameter is: propane pressure 0.5 ~ 0.6MPa, oxygen pressure 0.7 ~ 0.8MPa, nitrogen pressure 0.5 ~ 0.7MPa, air pressure 0.6 ~ 0.8MPa, propane working flow 70 ~ 75L/h, oxygen working flow 60 ~ 65L/h, nitrogen working flow 500 ~ 800L/h, air operational flow 100 ~ 150L/h, spray distance 220 ~ 250mm.
Optimally, in step (a), the atomic percent of described raw material is: Fe is 54%, Cr is 18%, Mo is 2%, Zr is 8%, B is 18%.
Further, described monitor system is 20 ~ 40kw, smelting time 10 ~ 30 minutes.
Optimally, in step (c), propane pressure 0.55MPa, oxygen pressure 0.8MPa, nitrogen pressure 0.6MPa, air pressure 0.8MPa, propane working flow 73L/h, oxygen working flow 62L/h, nitrogen working flow 600L/h, air operational flow 120L/h, spray distance 250mm.
Optimally, in step (c), described substrate is 304 stainless steels, spray-on coating thickness 0.3 ~ 0.5mm.
Optimally, in step (b), the mother alloy temperature of described fusing is 1500-1700 DEG C, and melt flow is 100 ~ 300 Grams Per Seconds, atomizing pressure 3-7MPa.
Optimally, in step (c), screening described non-crystalline state spherical powder with 325 ~ 800 object sieves and getting particle diameter is 15 ~ 45 μm.
Because technique scheme is used, the present invention compared with prior art has following advantages: the preparation method of height Cr of the present invention and high B content F e-Cr-B system amorphous coating, by adopting the raw material of specific atoms per-cent, and in conjunction with specific melting, the technology of efflorescence and spraying, high Cr and high B content F e-Cr-B system amorphous powder is made to have high-melting-point, powder formation rate can also be had in this case high, the feature that powder particle surface is smooth, obtained coating amorphous ratio is high, density is high, porosity is lower than 0.5%, bonding strength is higher than 55MPa, hardness is up to 1150HV0.1, wear-resistant and corrosion resistance and good, the good toughness of coating, just can implement spraying without the need to carrying out preheating to substrate, reduce the difficulty and cost of implementing spraying, adopt technical purity raw material, and be easy to suitability for industrialized production, reduce cost, this coating is a kind of potential neutron-absorbing, wear-resistant, corrosion resistant material, is expected to be applied to nuclear waste disposal field.
Accompanying drawing explanation
Fig. 1 is that the non-crystalline state spherical powder SEM that the preparation method of height Cr of the present invention and high B content F e-Cr-B system amorphous coating obtains schemes;
Fig. 2 is the XRD figure spectrum of the non-crystalline state spherical powder that obtains of the preparation method of height Cr of the present invention and high B content F e-Cr-B system amorphous coating and amorphous coating;
Fig. 3 is the cross-sectional SEM image of the amorphous coating that the preparation method of height Cr of the present invention and high B content F e-Cr-B system amorphous coating obtains, and figure (b) is the enlarged view of figure (a);
Fig. 4 is the coating that obtains of the present invention and the polarization curve of 304 stainless steels in the HCl solution of constant temperature 30 DEG C, 1mol/L.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiment of the invention is described in detail.
Embodiment 1
The present embodiment provides the preparation method of a kind of high Cr and high B content F e-Cr-B system amorphous coating, and it comprises the following steps:
A () takes by following atomic percent that raw material Fe is 54%, Cr is 18%, Mo is 2%, Zr is 8%, B is 18%, add in vacuum induction melting furnace, argon gas is passed into when vacuum tightness is 0.1Pa, (monitor system is 20kw to melting raw material, smelting time 30 minutes) and mix, mother alloy of casting to obtain; Raw material is that technically pure iron, technical pure chromium, industrial molybdenum-iron, industrial ferro-boron, zirconium sponge are or/and crystal zirconium;
B mother alloy is placed in heat fused in aerosolization stove by (), argon pressure be 6MPa, atomizing pressure is 3MPa, melt flow is 100 Grams Per Seconds, liquid mother alloy is atomized into non-crystalline state spherical powder by supersonic speed argon gas stream under being the condition of 300 DEG C (temperature is 1500 DEG C) by melt overheat degree; As can be seen from Figure 1, most of powder is spherical in shape, has good mobility, is applicable to hypersonic flame spraying;
C () gets the non-crystalline state spherical powder that particle diameter is 15 ~ 45 μm, adopt hypersonic flame spraying technology on 304 stainless steels, prepare Fe-Cr-B system amorphous coating, spraying parameter is: propane pressure 0.55MPa, oxygen pressure 0.8MPa, nitrogen pressure 0.6MPa, air pressure 0.8MPa, propane working flow 73L/h, oxygen working flow 62L/h, nitrogen working flow 600L/h, air operational flow 120L/h, spray distance 250mm, spray-on coating thickness is 0.3mm.
Accompanying drawing 2 is the X ray diffracting spectrum of coating and powder, can find out, collection of illustrative plates exists the wider diffraction peak of dispersing near 2 θ=45o, does not have significantly sharp-pointed crystalline diffraction peak, illustrates that the phase structure of coating is based on amorphous phase, only has a small amount of crystal to separate out mutually.Accompanying drawing 3 is the scanning electron microscope image of coating cross sections, can find out, coating one-piece construction is comparatively fine and close, in the form of sheets or banded particle mutually overlap pile up lamellar structure, only have hole between small number of layers, without obvious crackle.Adopt micro Vickers to measure the hardness of coating, apply pressure 100g, the hold-time is 10s, and hardness is about 1150HV0.1.Adopt stretching method to measure the bonding strength of coating, test-results shows, the bonding strength of coating and matrix is greater than 55MPa.Adopt ball/planar friction wearing test to measure the wear resistance of amorphous coating and 304 stainless steel substrates, result shows, the wear resistance of coating improves 2 times compared with 304 stainless steel substrates.Accompanying drawing 4 is the polarization curve of coating in the HCl solution of 1mol/L, and contrast with 304 stainless steel substrates, result shows: coating there occurs passivation in this solution, and 304 stainless steel substrates then in reactive systems, illustrate that coating has good erosion resistance in the HCl solution of 1mol/L.
Embodiment 2
The present embodiment provides the preparation method of a kind of high Cr and high B content F e-Cr-B system amorphous coating, basically identical in it and embodiment 1, inconsistent unlike its design parameter, is specially:
A () takes by following atomic percent that raw material Fe is 55%, Cr is 15%, Mo is 5%, Zr is 10%, B is 15%, add in vacuum induction melting furnace, argon gas is passed into when vacuum tightness is 0.05Pa, (monitor system is 40kw to melting raw material, smelting time 10 minutes) and mix, mother alloy of casting to obtain;
B mother alloy is placed in heat fused in aerosolization stove by (), argon pressure be 8MPa, atomizing pressure is 7MPa, melt flow is 300 Grams Per Seconds, liquid mother alloy is atomized into non-crystalline state spherical powder by supersonic speed argon gas stream under being the condition of 500 DEG C (temperature is 1700 DEG C) by melt overheat degree;
C () gets the non-crystalline state spherical powder that particle diameter is 15 ~ 45 μm, adopt hypersonic flame spraying technology on 304 stainless steels, prepare Fe-Cr-B system amorphous coating, spraying parameter is: propane pressure 0.6MPa, oxygen pressure 0.8MPa, nitrogen pressure 0.7MPa, air pressure 0.8MPa, propane working flow 75L/h, oxygen working flow 65L/h, nitrogen working flow 800L/h, air operational flow 150L/h, spray distance 230mm, spray-on coating thickness is 0.5mm.
Embodiment 3
The present embodiment provides the preparation method of a kind of high Cr and high B content F e-Cr-B system amorphous coating, basically identical in it and embodiment 1, inconsistent unlike its design parameter, is specially:
A () takes by following atomic percent that raw material Fe is 50%, Cr is 20%, Mo is 2%, Zr is 10%, B is 18%, add in vacuum induction melting furnace, argon gas is passed into when vacuum tightness is 0.02Pa, (monitor system is 30kw to melting raw material, smelting time 15 minutes) and mix, mother alloy of casting to obtain;
B mother alloy is placed in heat fused in aerosolization stove by (), argon pressure be 10MPa, atomizing pressure is 5MPa, melt flow is 200 Grams Per Seconds, liquid mother alloy is atomized into non-crystalline state spherical powder by supersonic speed argon gas stream under being the condition of 400 DEG C (temperature is 1600 DEG C) by melt overheat degree;
C () gets the non-crystalline state spherical powder that particle diameter is 15 ~ 45 μm, adopt hypersonic flame spraying technology on 304 stainless steels, prepare Fe-Cr-B system amorphous coating, spraying parameter is: propane pressure 0.5MPa, oxygen pressure 0.7MPa, nitrogen pressure 0.5MPa, air pressure 0.6MPa, propane working flow 70L/h, oxygen working flow 60L/h, nitrogen working flow 500L/h, air operational flow 100L/h, spray distance 220mm, spray-on coating thickness is 0.4mm.
Above-described embodiment, only for technical conceive of the present invention and feature are described, its object is to person skilled in the art can be understood content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences done according to spirit of the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (7)
1. a preparation method for high Cr and high B content F e-Cr-B system amorphous coating, it is characterized in that, it comprises the following steps:
A () takes raw material by following atomic percent: Fe is 50 ~ 55%, Cr be 15-20%, Mo be 2-5%, Zr be 5-10%, B is 15 ~ 20%, add in vacuum induction melting furnace, pass into argon gas when vacuum tightness≤0.1Pa, melting raw material also mixes, mother alloy of casting to obtain;
B described mother alloy is placed in heat fused in aerosolization stove by (), make its superheating temperature be 300 ~ 400 DEG C, liquid mother alloy is atomized into non-crystalline state spherical powder;
C () gets the described non-crystalline state spherical powder that particle diameter is 15 ~ 45 μm, adopt hypersonic flame spraying technology in substrate, prepare Fe-Cr-B system amorphous coating, spraying parameter is: propane pressure 0.5 ~ 0.6MPa, oxygen pressure 0.7 ~ 0.8MPa, nitrogen pressure 0.5 ~ 0.7MPa, air pressure 0.6 ~ 0.8MPa, propane working flow 70 ~ 75L/h, oxygen working flow 60 ~ 65L/h, nitrogen working flow 500 ~ 800L/h, air operational flow 100 ~ 150L/h, spray distance 220 ~ 250mm.
2. the preparation method of high Cr according to claim 1 and high B content F e-Cr-B system amorphous coating, it is characterized in that: in step (a), the atomic percent of described raw material is: Fe is 54%, Cr is 18%, Mo is 2%, Zr is 8%, B is 18%.
3. the preparation method of high Cr according to claim 2 and high B content F e-Cr-B system amorphous coating, is characterized in that: described monitor system is 20 ~ 40kw, smelting time 10 ~ 30 minutes.
4. the preparation method of high Cr according to claim 1 and high B content F e-Cr-B system amorphous coating, it is characterized in that: in step (c), propane pressure 0.55MPa, oxygen pressure 0.8MPa, nitrogen pressure 0.6MPa, air pressure 0.8MPa, propane working flow 73L/h, oxygen working flow 62L/h, nitrogen working flow 600L/h, air operational flow 120L/h, spray distance 250mm.
5. the preparation method of high Cr according to claim 1 and high B content F e-Cr-B system amorphous coating, it is characterized in that: in step (c), described substrate is 304 stainless steels, spray-on coating thickness 0.3 ~ 0.5mm.
6. the preparation method of high Cr according to claim 1 and high B content F e-Cr-B system amorphous coating, is characterized in that: in step (b), and the mother alloy temperature of described fusing is 1500-1700 DEG C, and melt flow is 100 ~ 300 Grams Per Seconds, atomizing pressure 3-7MPa.
7. the preparation method of high Cr according to claim 1 and high B content F e-Cr-B system amorphous coating, is characterized in that: in step (c), and screening described non-crystalline state spherical powder with 325 ~ 800 object sieves and getting particle diameter is 15 ~ 45 μm.
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| CN107470641A (en) * | 2017-08-02 | 2017-12-15 | 江西省电力设备总厂 | A kind of iron-based amorphous powder and preparation method thereof |
| CN108977753A (en) * | 2018-07-11 | 2018-12-11 | 吴长龙 | A kind of preparation method of amorphous coating |
| CN109972051A (en) * | 2018-06-08 | 2019-07-05 | 中南大学 | A kind of yttrium goes bad high hardness alloy and its casting method |
| CN109972050A (en) * | 2018-06-08 | 2019-07-05 | 中南大学 | A kind of yttrium toughened antiwear alloy and its casting and heat treatment method |
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Application publication date: 20160120 |