CN100535190C - A preparation method of composite coating (FeAl+Cr7C3)/γ-(Fe, ni) - Google Patents
A preparation method of composite coating (FeAl+Cr7C3)/γ-(Fe, ni) Download PDFInfo
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- CN100535190C CN100535190C CNB2008101022515A CN200810102251A CN100535190C CN 100535190 C CN100535190 C CN 100535190C CN B2008101022515 A CNB2008101022515 A CN B2008101022515A CN 200810102251 A CN200810102251 A CN 200810102251A CN 100535190 C CN100535190 C CN 100535190C
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Abstract
The invention provides a preparation method of composite coating of (FeAl+Cr7C3)/Gamma-(Fe, Ni). Low carbon steel is taken as base material and put on a working table for plasma cladding and the distance between the low carbon steel and plasma moment is 27-30mm; on the basis of Fe-based alloy powder system, Al2O3 powder with a weight percentage of 10-15 percent is ball-milled for 30-60 min to lead the powder to be fully mixed and produce coating material which is then put in a powder feeder of a plasma cladding device, so as to prepare plasma cladding coating. The technological parameters of the plasma cladding are: 250-300A of working current, 350-400mm/min of scanning speed, 0.4-0.8m<3>/h of powder blower gas (Ar), 0.4-0.8m<3>/h of plasma gas (Ar) and 0.4-0.8m<3>/h of protection gas (Ar). The coating prepared by the method of the invention has the advantages of small grain size, uneven composition and high coating hardness with good wear-resisting and anti-high temperature performances.
Description
Technical field
The invention belongs to technical field of surface coating, relate to a kind of intermetallic compound compound coating and preparation method thereof.
Background technology
The FeAl intermetallic compound has the performance of many excellences, comprises the fusing point height, and density is low, and the antioxidant property that heat-conductive characteristic is good and excellent is the potential high-temperature structural material.But its extensive industrialized is used and is also had following problem.The one, room temperature fragility and low yield strength have limited FeAl intermetallic compound processing characteristics at room temperature.Numerous investigators has carried out research work in this respect, according to the report of material heat treatment journal (2007, Vol.28, No.4, P16～21), adopts pressing methods to improve the room-temperature mechanical property of FeAl intermetallic compound; Tsing-Hua University's journal (natural science edition) (2004, Vol.44, No.5, P 585-588) report, at the pure Al powder of the surperficial precoating of 45 steel, synthesized Fe/Al compound coat with the method for light beam alloying, existed and organize the gradient transition characteristics, thereby improved its comprehensive mechanical property with layered characteristic.Kunming science and engineering Liu An strong (heat processing technique, 2006, Vol.35, No.20 P26-42) adopts the method for mechanical alloying and vacuum sintering to prepare the FeAl alloy, has obtained good room-temperature mechanical property.The research of relevant this respect also has a lot, but fruitful fewer, and the common ground of the method that adopts is exactly relatively harshness of preparation condition, the equipment complexity, and the energy consumption height, the production cycle is long.These higher cost can not satisfy the industrialization demand of FeAl material.In addition, great majority research at present all is at preparation FeAl integral material, preparation research to the FeAl intermetallic compound coating is less, and this integral material often can not satisfy service requirements, this is because under a lot of working conditions, needs the surperficial high rigidity of material and the cooperation of internal toughness.This has accelerated the development of coating technology to a certain extent.The coating technology of preparation FeAl intermetallic compound mainly contains thermospray and laser melting coating at present, and the hot spray coating associativity is bad, and coating porosity is bigger; And the large-scale laser cost costliness of laser melting coating is unfavorable for industrial applications.
The plasma melting coating technique is a kind of top coat technology that grew up in recent years, high energy beam-plasma stream energy height, good stability, can in atmosphere, operate, adopt the synchronous powder feeding system mode, and in the plasma cladding process, be not subjected to the intermiscibility of constituent, fusing point, the restriction of character such as density, utilize any proportioning of any powder, obtain the alloy layer that common metallurgical method can not obtain, be that material is A → B before and after metallurgical reaction, or A+B → C, or A+B → C+D etc. (also comprise A → A certainly, or A+B → A+B), for generating intermetallic compound, original position provides competent condition, and under the high energy beam current effect, melt simultaneously on powder and matrix top layer, and metallurgy layer and matrix reach the metallurgical binding state.The plasma melting coating equipment does not need vacuum system, and cost only is with 1/5～1/10 of power laser cladding equipment, production efficiency height, simple and convenient operation and maintenance.But at present also not enough far away aspect the manufacturing of plasma cladding coating, the plasma melting coating technique is difficult to expand its Application Areas only limiting to conventional coatings such as Fe base, Ni base aspect the preparation of coating.
Summary of the invention
The object of the present invention is to provide a kind of (FeAl+Cr
7C
3(Fe, the Ni) preparation method of compound coating is with FeAl intermetallic compound and Cr for)/y-
7C
3Hard is introduced in the coating mutually, and with toughness mutually y-(Fe, Ni) compound, effectively improve the mechanical property of intermetallic compound composite material, widen the Application Areas of intermetallic compound.The plasma melting coating technique that is adopted can overcome deficiencies such as original preparation intermetallic compound coating technology coating thermal stresses is big, relatively poor with basal body binding force, cost costliness.
The present invention (FeAl+Cr
7C
3)/γ-(Fe, Ni) preparation technology of compound coating is: body material is positioned on the plasma cladding worktable, with the distance of plasma square be 27～30mm; On the basis of iron(-)base powder system, the interpolation weight percent is 10～15% Al
2O
3Powder with powder ball milling 30～60min, makes the powder thorough mixing be mixed with coated material; Coated material is packed in the powder feeder of plasma melting coating equipment, set the plasma cladding processing parameter and be: working current 250～300A, sweep velocity 350～400mm/min, powder feeding gas (Ar): 0.4～0.8m
3/ h, plasma (orifice) gas (Ar): 0.4～0.8m
3/ h, protection gas (Ar): 0.4～0.8m
3/ h.Starting switch carries out the preparation of plasma cladding coating.After treating the coating cooling, emery wheel grinds off impurity such as surface scale, obtains (the FeAl+Cr of pore-free, flawless, light, densification
7C
3)/γ-(Fe, compound coating Ni).
Described body material is a soft steel, and thickness is 5～10mm.
The alloying element weight percent of described iron(-)base powder is: Cr 30.0～35.0%, Ni 4.5～5.5%, Mo3.0～4.5%, B 2.0～3.5%, Si 3.5～5.0%, Fe surplus.
Described powder size scope is 106～180 microns.
The present invention is from coated material, when preparation FeAl intermetallic compound, adds a certain amount of Al on the basis of iron(-)base powder system
2O
3Powder, uniform mixing is as coated material.In the plasma cladding process, Al
2O
3With alloying element generation chemical reaction, original position generates FeAl intermetallic compound, hard phase Cr
7C
3The γ good with ductility-(Fe Ni), as shown in Figure 1, obtains thus that crystal grain is tiny, the uniform rapid solidification tissue of composition; The coating hardness height, wear resisting property and high temperature oxidation resistance are good.
Contextual analysis of organization to coating finds that coating structure is that crystal grain is tiny, and composition is even, FeAl and Cr
7C
3The rapid solidification tissue that disperse distributes, wherein FeAl intermetallic compound and carbide Cr
7C
3Interdependent growth.Microhardness of coating is about HV
0.2900～1100, on SRV high temperature friction and wear trier, carry out the wearing test of normal temperature and 500 ℃ respectively, be respectively about 0.35 and 0.3 at normal temperature and pyritous frictional coefficient, still all have good abrasion resistance properties at normal temperature at high temperature.Carry out 700 ℃ of high temperature circulation oxidations in high temperature resistance furnace, take out weighing once every 10h, test shows that at 10 hours of beginning, oxidation weight gain was than very fast, and rate of body weight gain is 0.0152～0.0203mgcm
-2H
-1, coatingsurface forms fine and close oxide film, the further oxidation of hinder coating, and oxidation weight gain is slower afterwards, and rate of body weight gain is 0.0040～0.0086mgcm
-2H
-1The high temperature oxidation resistance excellence.
Description of drawings
Fig. 1 (FeAl+Cr
7C
3)/γ-(Fe, Ni) compound coating XRD figure spectrum;
Fig. 2 example 1 (FeAl+Cr
7C
3)/γ-(Fe, Ni) compound coating tissue topography;
Fig. 3 example 2 (FeAl+Cr
7C
3)/γ-(Fe, Ni) compound coating tissue topography;
Fig. 4 example 3 (FeAl+Cr
7C
3)/γ-(Fe, Ni) compound coating tissue topography.
Embodiment
Example 1. takes by weighing the 200g coated material, and wherein each component content is Cr 60g, Ni 10g, Mo 8g, B 6g, Si 8g, Fe88g and Al
2O
320g.Powdered alloy is put into low temperature ball milling instrument ball milling 30min, and the powder size scope is 106～180 microns, makes its thorough mixing, the preparation coated material.Coated material is packed in the powder feeder of plasma melting coating equipment, set the plasma cladding processing parameter and be: working current 280A, sweep velocity 380mm/min, powder feeding gas (Ar): 0.6m
3/ h, plasma (orifice) gas (Ar): 0.6m
3/ h, protection gas (Ar): 0.6m
3/ h; With mild steel plate cut into 150mm * 100mm size, thickness be the test block of 6mm as matrix, be put on the worktable at 30mm place under the plasmatorch; After ready, start the plasma melting coating equipment, the preparation compound coating.Cladding finishes, and after coating cooling, grinds off oxide skin, the slag of coatingsurface with emery wheel, obtains smooth, bright, flawless coating.Crystal grain is tiny in the coating, and composition is even, is FeAl and Cr
7C
3The rapid solidification tissue that disperse distributes, as shown in Figure 2; The composition of energy spectrum analysis compound coating (weight percent) is: Cr 31.5%-Fe 44.2%-Ni 5.2%-Mo 3.4%-Si 3.5%-Al 12.2%.
Microhardness of coating is about HV
0.21000, its normal temperature and pyritous frictional coefficient are about 0.35 and 0.3 respectively, have good abrasion resistance properties.700 ℃ of high temperature circulation oxidation tests show that at the initial 10h of oxidation, the oxidation weight gain rate is 0.018mgcm
-2H
-1, coatingsurface forms fine and close oxide film, and when high temperature oxidation proceeded to 100h, its rate of body weight gain was 0.005mgcm
-2H
-1The high temperature oxidation resistance excellence.
Example 2. takes by weighing the 200g coated material, and wherein each component content is Cr 65g, Ni 10g, Mo 8g, B 6g, Si 8g, Fe73g and Al
2O
330g.Powdered alloy is put into low temperature ball milling instrument ball milling 40min, make its thorough mixing, be mixed with coated material.The coated material that mixes is packed in the powder feeder of plasma melting coating equipment, set the plasma cladding processing parameter and be: working current 300A, sweep velocity 400mm/min, powder feeding gas (Ar): 0.5m
3/ h, plasma (orifice) gas (Ar): 0.5m
3/ h, protection gas (Ar): 0.5m
3/ h; With the Q235 steel plate cut into 150mm * 100mm size, thickness is the test block of 8mm, as matrix, be put on the worktable at 30mm place under the plasmatorch; After ready, start the plasma melting coating equipment, the preparation compound coating.Cladding finishes, and after coating cooling, grinds off oxide skin, the slag of coatingsurface with emery wheel, obtains the coating of light.Coating structure is that crystal grain is tiny, and composition is even, FeAl and Cr
7C
3The rapid solidification tissue that disperse distributes, as shown in Figure 3; The composition of energy spectrum analysis compound coating (weight percent) is: Cr 32.5%-Fe 41.2%-Ni 4.5%-Mo3.2%-Si 3.4%-Al 15.2% microhardness of coating can reach HV
0.21100, its normal temperature and pyritous frictional coefficient are about 0.35 and 0.3 respectively, have good abrasion resistance properties.700 ℃ of high temperature circulation oxidation tests show, at the initial 10h of oxidation, and oxidation weight gain rate 0.015mgcm
-2H
-1, coatingsurface forms fine and close oxide film, and when high temperature oxidation proceeded to 100h, its rate of body weight gain was 0.004mgcm
-2H
-1The high temperature oxidation resistance excellence.
Example 3. takes by weighing the 200g coated material, and wherein each component content is Cr 65g, Ni 10g, Mo 8g, B 6g, Si 8g, Fe79g and Al
2O
324g.Powdered alloy is put into low temperature ball milling instrument ball milling 60min, make its thorough mixing.Coated material is packed in the powder feeder of plasma melting coating equipment, set the plasma cladding processing parameter and be: working current 300A, sweep velocity 400mm/min, powder feeding gas (Ar): 0.6m
3/ h, plasma (orifice) gas (Ar): 0.6m
3/ h, protection gas (Ar): 0.6m
3/ h; With the Q235 steel plate cut into 150mm * 100mm size, thickness is the test block of 9mm, as the body material of intermetallic compound compound coating, be put on the worktable at 30mm place under the plasmatorch; After ready, start the plasma melting coating equipment, the preparation compound coating.Cladding finishes, and after coating cooling, grinds off oxide skin, the slag of coatingsurface with emery wheel, obtains the coating of light.Coating structure is that crystal grain is tiny, and composition is even, FeAl and Cr
7C
3The rapid solidification tissue that disperse distributes, as shown in Figure 4; The composition of energy spectrum analysis compound coating (weight percent) is: Cr 31.5%-Fe 43.2%-Ni 4.8%-Mo 3.4%-Si 3.5%-Al 13.5%.Microhardness of coating is about HV
0.2980, its normal temperature and pyritous frictional coefficient are about 0.35 and 0.3 respectively, have good abrasion resistance properties.700 ℃ of high temperature circulation oxidation tests show, at the initial 10h of oxidation, and oxidation weight gain rate 0.020mgcm
-2H
-1, and coatingsurface forms fine and close oxide film, when high temperature oxidation proceeds to 100h, its rate of body weight gain is 0.007mgcm
-2H
-1The high temperature oxidation resistance excellence.
Claims (3)
1, a kind of (FeAl+Cr
7C
3)/γ-(Fe, the Ni) preparation method of compound coating is characterized in that: mild steel plate is positioned on the plasma cladding worktable, with the distance of plasma square be 27～30mm; At the alloying element weight percent be: on the basis of the iron(-)base powder of Cr 30.0～35.0%, Ni 4.5～5.5%, Mo 3.0～4.5%, B 2.0～3.5%, Si 3.5～5.0%, Fe surplus, the interpolation weight percent is 10～15% Al
2O
3Powder with powder ball milling 30～60min, makes the powder thorough mixing be mixed with coated material; Coated material is packed in the powder feeder of plasma melting coating equipment into plasma cladding working current 250～300A, sweep velocity 350～400mm/min, powder feeding gas 0.4～0.8m
3/ h, plasma (orifice) gas 0.4～0.8m
3/ h, protection gas 0.4～0.8m
3/ h.
2, preparation method as claimed in claim 1 is characterized in that, described mild steel plate thickness is 5～10mm.
3, preparation method as claimed in claim 1 is characterized in that, powder feeding gas, plasma (orifice) gas, protection gas all use argon gas.
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Cited By (1)
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| CN106367706A (en) * | 2016-09-12 | 2017-02-01 | 山东科技大学 | Plasma spray gradient wear-resistant plate and preparation method and application thereof |
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| CN102191496B (en) * | 2011-04-21 | 2013-08-21 | 中国矿业大学 | Material of guide sliding shoe of coal-winning machine and preparation method of material |
| CN102230176B (en) * | 2011-07-27 | 2012-09-26 | 王建升 | Surface plasma cladding method of metal turbine runner |
| CN107574298B (en) * | 2017-08-30 | 2019-05-28 | 南京百田机械制造有限公司 | A kind of solid waste crusher cutter steel |
| CN107988595B (en) * | 2017-11-30 | 2020-12-11 | 钢铁研究总院 | Preparation of Fe by laser cladding3Al/Cr3C2Method for composite coating |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101033543A (en) * | 2007-04-10 | 2007-09-12 | 北京科技大学 | Plasma melting coating iron-base amorphous nano-crystalline coat and preparing method thereof |
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|---|---|---|---|---|
| CN101033543A (en) * | 2007-04-10 | 2007-09-12 | 北京科技大学 | Plasma melting coating iron-base amorphous nano-crystalline coat and preparing method thereof |
Non-Patent Citations (2)
| Title |
|---|
| Characteristics of Fe-based alloy coating produced byplasmacladding process. Limin Zhang, et al.Material science and engineering A,Vol.457 . 2007 * |
| 高速电弧喷涂Fe-Al/Cr3C2复合涂层的组织与性能. 徐维普等.金属热处理，第29卷第5期. 2004 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106367706A (en) * | 2016-09-12 | 2017-02-01 | 山东科技大学 | Plasma spray gradient wear-resistant plate and preparation method and application thereof |
| CN106367706B (en) * | 2016-09-12 | 2018-09-21 | 山东科技大学 | A kind of plasma spray gradient wearing plate and its preparation method and application |
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