CN104018111A - Ferrite electric-conduction ceramic coating and preparation method - Google Patents
Ferrite electric-conduction ceramic coating and preparation method Download PDFInfo
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- CN104018111A CN104018111A CN201410209068.0A CN201410209068A CN104018111A CN 104018111 A CN104018111 A CN 104018111A CN 201410209068 A CN201410209068 A CN 201410209068A CN 104018111 A CN104018111 A CN 104018111A
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Abstract
The invention discloses a ferrite electric-conduction ceramic coating and a preparation method, and belongs to the field of surface engineering. The ferrite electric-conduction ceramic coating is a composite coating and composed of an adhesive layer and a ceramic layer. The adhesive layer is a metal material or an alloy material, and the ceramic layer is a ferrite ceramic material with the molecular formula of MeFe2O4. The preparation method comprises: employing a plasma spraying technology to spray an adhesive-layer powder to the surface of a to-be sprayed metal substrate, so as to form the adhesive layer; and then spraying a ferrite ceramic powder to the surface of the adhesive layer, so as to form the ceramic layer. The ferrite electric-conduction ceramic coating has god corrosion resistance, electric conduction performance and hot spraying adaptability. The preparation method is simple in technology, low in cost and strong in repeatability, is applicable to metal-substrate surfaces with different shapes and different sizes, exhibits superiority especially when applied to corrosion-resistant electric-conduction ceramic coatings for large-area practical application, and is suitable for industrial popularization.
Description
Technical field
The present invention relates to a kind of ferrite conductivity ceramics coating and preparation method, belong to Surface Engineering field.
Background technology
Ground net is in power station, substation, communication station, to guarantee the necessary facility of working grounding, grounding for lightening, protective ground.Because soil has certain corrosive nature, earthing pole material is often because protecting improper being corroded.Fast development along with extreme high voltage HVDC Transmission Technology, there is certain defect as carbon steel, rich chromium cast iron etc. in conventional earthing pole material, corrosion of carbon steel is too fast, the deficiencies such as erosion rate sharply increases will be more outstanding under high overflow density for rich chromium cast iron, directly threaten operating safety and the reliability of DC transmission engineering.Direct current grounding pole excavation repair and maintenance difficulty, expense is high, and this has higher requirement to the conductivity of earthing pole material and Corrosion Protection.
Ferrite Material has spinel structure, and its erosion resistance is better than rich chromium cast iron class electrode, and part Ferrite Material has higher specific conductivity, and main component is Fe
2o
3, in preparation and use procedure, can not produce secondary pollution harm environment, be the anticorrosive electrode materials of environmental protection of new generation.The method of preparing at present ferrite earthing pole product is mainly sintering process and casting.Sintering process technique is simple, but the production cycle is long, easily has the problems such as reaction is incomplete, when preparation large size product, easily produces blank cracking or distortion, therefore be difficult to realize the preparation of large size product in dry and sintering process; Casting has advantages of that production cost is low, the cycle is short, be suitable for preparing simple shape, electrode product that volume is larger, but because metal oxide and simple metal-powder have very large difference in nature, the Castability of Ferrite Material is poor simultaneously, need to adopt special foundry engieering and strict atmosphere to control technique, reduced this preparation method's practicality and operability.Hot-spraying techniques provides new thinking for ferritic preparation.At conventional carbon steel earthing pole surface-coated ferrite coating, by coating protection technology, guaranteeing, under the prerequisite of excellent conductive performance, to improve the corrosion resistance nature of earthing pole body, there is good development prospect.The US Patent No. 3850701 of people's applications such as Yi Tai points out only there is 0.02mm with the maximum ga(u)ge of the ferrite coating of chemical method deposition, can not meet the requirement of earthing pole body to work-ing life, does not prepare available ferrite conductivity ceramics coating conscientiously.
Summary of the invention
One of object of the present invention is to provide a kind of ferrite conductivity ceramics coating, and described ferrite conductivity ceramics coated material has good corrosion resistance nature and conductivity.Two of object is to provide a kind of preparation method of ferrite conductivity ceramics coating, it is a kind of air plasma spraying method, by powder spraying on metallic matrix, form a kind ofly there is low porosity, compared with high bond strength, good corrosion resistance nature and the ferrite conductivity ceramics coating of conductivity.
Object of the present invention is realized by following technical scheme:
A kind of ferrite conductivity ceramics coating, described ferrite conductivity ceramics coating is compound coating, the tack coat being coated on metallic matrix, consist of with the ceramic layer being coated on tack coat, described tack coat is metallic substance or alloy material, and described ceramic layer is that molecular formula is MeFe
2o
4ferrite ceramics material;
Wherein, the preferred Al of bonding layer material of the present invention, Zn, a kind of or Al base alloy in Co and Cu, Zn base alloy, Co base alloy, a kind of in Cu base alloy and Ni base alloy; Described MeFe
2o
4the preferred Mn of middle Me
2+, Zn
2+, Cu
2+, Ni
2+, Mg
2+, Co
2+or Li
+ 0.5fe
3+ 0.5;
A preparation method for ferrite conductivity ceramics coating, described method steps is as follows:
(1) treat that metallize matrix surface cleans, sandblasting;
(2) respectively tack coat powder and ferrite ceramics powder are carried out to drying and processing, and two kinds of powder after drying are respectively charged in powder feeder, wherein, drying and processing temperature is 80～200 ℃;
(3) metallic matrix to be sprayed is fixed on the worktable of plasma spraying equipment, and adopts further cleaning metal base surface to be sprayed of pressurized air;
(4) treat metallize matrix surface and carry out, after preheating, with plasma gun, first tack coat powder being evenly sprayed into metal base surface to be sprayed, form tack coat, the thickness of tack coat is 0.1～0.2mm; Again ferrite ceramics powder is evenly sprayed into tie layer surface, forms ceramic layer, ceramic layer thickness is 0.1～0.3mm;
Wherein, adopt internal powder conveying mode to carry out powder feeding in spraying process, plasma spray coating process parameter, in Table 1, adopts pressure-air cooling metallic matrix to be sprayed in Plasma Spraying Process Using;
Table 1
Tack coat and ceramic layer have formed ferrite conductivity ceramics coating of the present invention jointly;
Wherein, step (1) preferably adopts analytically pure acetone to treat metallize matrix surface and cleans, to remove the impurity such as dust that metal base surface to be sprayed adheres to and greasy dirt; Adopt 30～80 object white fused alumina sand to carry out sandblast;
The described tack coat powder of step (2) and ferrite ceramics powder preferable particle size scope are the powdered material of 20～100 μ m, particle good sphericity, good fluidity; The preferred scraper-type powder feeder of powder feeder;
Main gas and the carrier gas of the described plasma spraying of step (4) are Ar gas, and auxiliary gas is He gas.
Beneficial effect
(1) ferrite conductivity ceramics coating of the present invention is a kind of compound coating, comprising being coated in the tack coat of metal base surface and being coated in the ceramic layer on tack coat, tack coat has improved the bonding strength of ceramic layer and metallic matrix, has kept the conductivity of metallic matrix simultaneously; Ferrite ceramics layer has good corrosion resistance nature and conductivity.
(2) ceramic layer of the present invention has been selected a kind of low melting point, corrosion-resistant, good electrical conductivity and the adaptable ferrite ceramics material of spraying, make described ferrite conductivity ceramics coating can be used for existing in the facilities such as power station, substation, communication station the metal construction of corrosion phenomenon, Application Areas is extensive.
(3) preparation method of a kind of ferrite conductivity ceramics coating of the present invention, by optimizing air plasma spraying processing parameter, make ferrite ceramics coating keep the phase structure of powder Spinel, and to have prepared porosity ranges be 1%～5%, the bonding strength of coating and metallic matrix is 30～40MPa, and resistivity is less than 8 * 10
-3the ferrite conductivity ceramics coating of Ω cm.
(4) described preparation method's technique is simple, with low cost, repeatability is strong, can be applied to the metal base surface of different shapes or different sizes, particularly when the anti-corrosion electric conducting ceramic coating of preparation big area practical application, highlight its superiority, and repair and maintenance is simple in workpiece military service process, suitable industry is promoted.
Accompanying drawing explanation
Fig. 1 is that in embodiment 1, ferrite conductivity ceramics is coated with layer cross section scanning electron microscope (SEM) photograph;
Fig. 2 is that in embodiment 2, ferrite conductivity ceramics is coated with layer cross section scanning electron microscope (SEM) photograph;
Fig. 3 is that in embodiment 3, ferrite conductivity ceramics is coated with layer cross section scanning electron microscope (SEM) photograph;
Fig. 4 is that two hold-carryings are measured ferrite conductivity ceramics coating resistance schematic diagram.
Embodiment
Below by embodiment, the invention will be further described, but embodiment does not limit the scope of the invention.
In following examples, plasma spraying equipment used is the 5500 type plasma spray systems that U.S. Praxair company produces, and spray gun is SG100; The manufacturer of CO-211 Co-based alloy powder and CO-210 Co-based alloy powder is U.S. Praxair company.
The ferrite conductivity ceramics coating that following examples are prepared is tested as follows:
(1) ferrite conductivity ceramics coating morphology observation and porosity measurement:
Utilize ferrite conductivity ceramics coating pattern described in light microscopic and the Japanese new and high technology S-4800 of Co., Ltd. type awkward silence at a meeting emission scan electron microscope observation; Adopt IA32 image analysis software to calculate the mean value of the porosity of ferrite conductivity ceramics coating;
(2) ferrite conductivity ceramics anchoring strength of coating is measured
Utilize bonding stretching method on universal testing machine, to measure the bonding strength of ferrite conductivity ceramics coating and metallic matrix, draw speed is 1mm/min;
(3) ferrite conductivity ceramics conductivity is measured
The resistance the calculated resistance rate that adopt two hold-carrying test ferrite conductivity ceramics coatings, in order to reduce the contact resistance of ferrite conductivity ceramics coating and ohmmeter, reduce measuring error, adopts the conductive resin of certain area to attach sample, as shown in Figure 4.The positive and negative test pencil of use ohmmeter contacts respectively the not spray-coating surface of conductive resin and metallic matrix, and the resistance value surveyed is approximately the resistance of conductive resin coverage rate below ferrite conductivity ceramics coating.
According to the calculation formula of resistivity (formula 1), can calculate the resistivity under ferrite conductivity ceramics coating normal temperature.
In formula: ρ is the resistivity of ferrite conductivity ceramics coating;
S is the area of conductive resin;
H is the thickness of ferrite conductivity ceramics coating;
R is the resistance of conductive resin coverage rate below ferrite conductivity ceramics coating.
Embodiment 1
(1) to LY12 hard steel plate to be sprayed surface, adopt analytically pure acetone to clean, and adopt 30～80 object white fused alumina sand to carry out sandblasting;
(2) selecting particle size range is that the CO-211 Co-based alloy powder of 20～100 μ m is as tack coat powder and Li
0.5fe
2.5o
4powder, as ferrite ceramics powder, carries out drying and processing by two kinds of powder at 100 ℃ respectively, and two kinds of powder after drying are respectively charged in powder feeder;
(3) LY12 hard steel plate to be sprayed is fixed on the worktable of plasma spraying equipment, and adopts further cleaning LY12 hard steel plate to be sprayed surface of pressurized air;
(4) for being installed, the mechanical manipulator of spray gun sets spraying track route program;
(5) set plasma spray coating process parameter, LY12 hard steel plate to be sprayed surface is carried out after preheating with plasma gun tack coat powder spraying to LY12 hard steel plate to be sprayed surface, form tack coat, the thickness of tack coat is 0.1mm, and wherein spray parameters is electric current 600A, main gas 3m
3h
-1, auxiliary gas 1m
3h
-1, powder sending quantity 25gmin
-1, carrier gas 0.2m
3h
-1, spray distance 100mm; Again by ferrite ceramics powder spraying to tie layer surface, form ceramic layer, ceramic layer thickness is 0.2mm, wherein spray parameters is electric current 800A, main gas 2.2m
3h
-1, auxiliary gas 1.5m
3h
-1, powder sending quantity 30gmin
-1, carrier gas 1m
3h
-1, spray distance 120mm; Main gas and carrier gas are Ar gas, and auxiliary gas is He gas.
The ferrite conductivity ceramics coating that the present embodiment is prepared is tested as follows, and result is as follows:
(1) ferrite conductivity ceramics coating morphology observation and porosity measurement:
As shown in Figure 1, as shown in Figure 1, ferrite conductivity ceramics coating structure is even and fine and close for the Cross Section Morphology of described ferrite conductivity ceramics coating, and the porosity mean value that calculates this coating by IA32 image analysis software is 1.8%.
(2) ferrite conductivity ceramics anchoring strength of coating is measured:
The ferrite conductivity ceramics coating that described ferrite conductivity ceramics coating records by bonding stretching method and the bonding strength of LY12 hard steel plate are 30.6MPa.
(3) ferrite conductivity ceramics conductivity is measured
The resistance that described ferrite conductivity ceramics coating records is 2.22 Ω, by correlation parameter S=6.4 * 10
-1cm
2, h=1.8 * 10
-2cm substitution formula (1), the resistivity at room temperature that calculates this ferrite conductivity ceramics coating is 7.9 * 10
-3Ω cm.
Embodiment 2
(1) to LY12 hard steel plate to be sprayed surface, adopt analytically pure acetone to clean, and adopt 30～80 object white fused alumina sand to carry out sandblasting;
(2) selecting particle size range is that the CO-210 Co-based alloy powder of 20～100 μ m is as tack coat powder and NiFe
2o
4powder, as ferrite ceramics powder, carries out drying and processing by two kinds of powder at 80 ℃ respectively, and two kinds of powder after drying are respectively charged in powder feeder;
(3) LY12 hard steel plate to be sprayed is fixed on the worktable of plasma spraying equipment, and adopts further cleaning LY12 hard steel plate to be sprayed surface of pressurized air;
(4) for being installed, the mechanical manipulator of spray gun sets spraying track route program;
(5) set plasma spray coating process parameter, LY12 hard steel plate to be sprayed surface is carried out after preheating with plasma gun tack coat powder spraying, to LY12 hard steel plate to be sprayed surface, forming tack coat, wherein spray parameters is electric current 550A, main gas 1m
3h
-1, auxiliary gas 2m
3h
-1, powder sending quantity 10gmin
-1, carrier gas 0.6m
3h
-1, spray distance 70mm, the thickness of tack coat is 0.15mm; Again by ferrite ceramics powder spraying to tie layer surface, form ceramic layer, wherein spray parameters is electric current 700A, main gas 3m
3h
-1, auxiliary gas 1m
3h
-1, powder sending quantity 6gmin
-1, carrier gas 0.2m
3h
-1, spray distance 70mm, ceramic layer thickness is 0.1mm; Main gas and carrier gas are Ar gas, and auxiliary gas is He gas.
The ferrite conductivity ceramics coating that the present embodiment is prepared is tested as follows, and result is as follows:
(1) ferrite conductivity ceramics coating morphology observation and porosity measurement:
As shown in Figure 2, as shown in Figure 2, ferrite conductivity ceramics coating structure is even and fine and close for the Cross Section Morphology of described ferrite conductivity ceramics coating, and the porosity mean value that calculates this coating by IA32 image analysis software is 1.5%.
(2) ferrite conductivity ceramics anchoring strength of coating is measured:
Ferrite conductivity ceramics coating and LY12 hard steel plate bonding strength that described ferrite conductivity ceramics coating records by bonding stretching method are 36.3MPa.
(3) ferrite conductivity ceramics conductivity is measured
The resistance that described ferrite conductivity ceramics coating records is 2.0 Ω, by correlation parameter S=6.4 * 10
-1cm
2, h=1.9 * 10
-2cm substitution formula (1), the resistivity at room temperature that calculates this ferrite conductivity ceramics coating is 6.7 * 10
-3Ω cm.
Embodiment 3
(1) to LY12 hard steel plate to be sprayed surface, adopt analytically pure acetone to clean, and adopt 30～80 object white fused alumina sand to carry out sandblasting;
(2) selecting particle size range is that the CO-211 Co-based alloy powder powdered alloy of 20～100 μ m is as tack coat powder and ZnFe
2o
4powder, as ferrite ceramics powder, carries out drying and processing by two kinds of powder at 200 ℃ respectively, and two kinds of powder after drying are respectively charged in powder feeder;
(3) LY12 hard steel plate to be sprayed is fixed on the worktable of plasma spraying equipment, and adopts further cleaning LY12 hard steel plate to be sprayed surface of pressurized air;
(4) for being installed, the mechanical manipulator of spray gun sets spraying track route program;
(5) set plasma spray coating process parameter, LY12 hard steel plate to be sprayed surface is carried out after preheating with plasma gun tack coat powder spraying to LY12 hard steel plate to be sprayed surface, form tack coat, the thickness of tack coat is 0.2mm, and wherein spray parameters is electric current 650A, main gas 2m
3h
-1, auxiliary gas 1.5m
3h
-1, powder sending quantity 40gmin
-1, carrier gas 1m
3h
-1, spray distance 120mm; Again by ferrite ceramics powder spraying to tie layer surface, form ceramic layer, ceramic layer thickness is 0.3mm, wherein spray parameters is electric current 750A, main gas 1m
3h
-1, auxiliary gas 2m
3h
-1, powder sending quantity 15gmin
-1, carrier gas 0.4m
3h
-1, spray distance 95mm; Main gas and carrier gas are Ar gas, and auxiliary gas is He gas.
The ferrite conductivity ceramics coating that the present embodiment is prepared is tested as follows, and result is as follows:
(1) ferrite conductivity ceramics coating morphology observation and porosity measurement:
As shown in Figure 3, as shown in Figure 3, ferrite conductivity ceramics coating structure is even and fine and close for the Cross Section Morphology of described ferrite conductivity ceramics coating, and the porosity mean value that calculates this coating by IA32 image analysis software is 1.6%.
(2) ferrite conductivity ceramics anchoring strength of coating is measured:
The ferrite conductivity ceramics coating that described ferrite conductivity ceramics coating records by bonding stretching method and the bonding strength of LY12 hard steel plate are 32.4MPa.
(3) ferrite conductivity ceramics conductivity is measured
The resistance that described ferrite conductivity ceramics coating records is 2.15 Ω, by correlation parameter S=6.4 * 10
-1cm
2, h=1.8 * 10
-2cm substitution formula (1), the resistivity at room temperature that calculates this ferrite conductivity ceramics coating is 7.6 * 10
-3Ω cm.
The present invention includes but be not limited to above embodiment, every any being equal to of carrying out under the principle of spirit of the present invention, replaces or local improvement, all will be considered as within protection scope of the present invention.
Claims (6)
1. a ferrite conductivity ceramics coating, it is characterized in that: described ferrite conductivity ceramics coating is compound coating, by the tack coat being coated on metallic matrix, formed with the ceramic layer being coated on tack coat, described tack coat is metallic substance or alloy material, and described ceramic layer is that molecular formula is MeFe
2o
4ferrite ceramics material, wherein, Me is Mn
2+, Zn
2+, Cu
2+, Ni
2+, Mg
2+, Co
2+and Li
+ 0.5fe
3+ 0.5in a kind of.
2. a kind of ferrite conductivity ceramics coating according to claim 1, is characterized in that: described bonding layer material is Al, Zn, a kind of or Al base alloy in Co and Cu, Zn base alloy, Co base alloy, a kind of in Cu base alloy and Ni base alloy.
3. a preparation method for ferrite conductivity ceramics coating as claimed in claim 1 or 2, is characterized in that: described method steps is as follows:
(1) treat that metallize matrix surface cleans, sandblasting;
(2) respectively tack coat powder and ferrite ceramics powder are carried out to drying and processing, and two kinds of powder after drying are respectively charged in powder feeder, wherein, drying and processing temperature is 80～200 ℃;
(3) metallic matrix to be sprayed is fixed on the worktable of plasma spraying equipment, and adopts further cleaning metal base surface to be sprayed of pressurized air;
(4) treat metallize matrix surface and carry out, after preheating, with plasma gun, first tack coat powder being evenly sprayed into metal base surface to be sprayed, form tack coat, the thickness of tack coat is 0.1～0.2mm; Again ferrite ceramics powder is evenly sprayed into tie layer surface, forms ceramic layer, ceramic layer thickness is 0.1～0.3mm; Tack coat and ceramic layer have formed described ferrite conductivity ceramics coating jointly;
Wherein, adopt internal powder conveying mode to carry out powder feeding in spraying process, plasma spray coating process parameter, in Table 1, adopts pressure-air cooling metallic matrix to be sprayed in Plasma Spraying Process Using.
Table 1
4. the preparation method of a kind of ferrite conductivity ceramics coating according to claim 3, is characterized in that: step (1) adopts analytically pure acetone to treat metallize matrix surface and cleans; Adopt 30～80 object white fused alumina sand to carry out sandblast.
5. the preparation method of a kind of ferrite conductivity ceramics coating according to claim 3, is characterized in that: the described tack coat powder of step (2) and ferrite ceramics powder diameter scope are 20～100 μ m; Powder feeder is scraper-type powder feeder.
6. the preparation method of a kind of ferrite conductivity ceramics coating according to claim 3, is characterized in that: main gas and the carrier gas of the described plasma spraying of step (4) are Ar gas, and auxiliary gas is He gas.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108893737A (en) * | 2018-08-01 | 2018-11-27 | 苏州涵轩信息科技有限公司 | A kind of preparation method of conductivity ceramics coating |
| CN109988989A (en) * | 2019-03-20 | 2019-07-09 | 武汉大学 | A kind of iron oxide basic corrosion-inhibiting coating and preparation method thereof |
| CN113549860A (en) * | 2021-06-22 | 2021-10-26 | 河南科技大学 | Composite ceramic coating for motor insulating bearing and preparation method thereof |
| CN114774828A (en) * | 2022-04-19 | 2022-07-22 | 国网黑龙江省电力有限公司大兴安岭供电公司 | Hot-sprayed long-acting corrosion-resistant protective coating on surface of grounding electrode and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103602941A (en) * | 2013-11-28 | 2014-02-26 | 国家电网公司 | Ferrite conductive coating and preparation method thereof |
-
2014
- 2014-05-16 CN CN201410209068.0A patent/CN104018111A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103602941A (en) * | 2013-11-28 | 2014-02-26 | 国家电网公司 | Ferrite conductive coating and preparation method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108893737A (en) * | 2018-08-01 | 2018-11-27 | 苏州涵轩信息科技有限公司 | A kind of preparation method of conductivity ceramics coating |
| CN109988989A (en) * | 2019-03-20 | 2019-07-09 | 武汉大学 | A kind of iron oxide basic corrosion-inhibiting coating and preparation method thereof |
| CN113549860A (en) * | 2021-06-22 | 2021-10-26 | 河南科技大学 | Composite ceramic coating for motor insulating bearing and preparation method thereof |
| CN114774828A (en) * | 2022-04-19 | 2022-07-22 | 国网黑龙江省电力有限公司大兴安岭供电公司 | Hot-sprayed long-acting corrosion-resistant protective coating on surface of grounding electrode and preparation method thereof |
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Application publication date: 20140903 |