CN105112845A - Stain-proof self-cleaning thermal barrier coating and preparation method thereof - Google Patents
Stain-proof self-cleaning thermal barrier coating and preparation method thereof Download PDFInfo
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- CN105112845A CN105112845A CN201510495241.2A CN201510495241A CN105112845A CN 105112845 A CN105112845 A CN 105112845A CN 201510495241 A CN201510495241 A CN 201510495241A CN 105112845 A CN105112845 A CN 105112845A
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Abstract
The invention discloses a stain-proof self-cleaning thermal barrier coating. Oxidation resistance of a ceramic phase and permeability of base metal can be improved after aluminum powder is added and modified through high-temperature calcination. Besides, part of particles are not sufficiently melted in plasma jet in the spray coating process, the deformation degree of the particles is low when the particles collide with a base, porous structures in lap joint are formed easily, and the heat isolation performance of the coating is improved. Through the modification method, Y3+ and Ce4+ in a zirconium dioxide crystal lattice replace Zr4+, oxygen vacancy and a local stress field are generated, phonon scattering in the crystal lattice is improved, and heat conductivity is obviously lowered. Besides, the atomic weight of solid solution atoms Ce is far larger than that of Y, phonon scattering intensity in the coating can be obviously increased, and accordingly heat conductivity is lowered. The prepared coating is high in surface hardness, good in toughness and not prone to cracking or layering, has stain-proof and self-cleaning functions, and has oxidization resistance, high thermal stability and good thermal shock resistance.
Description
Technical field
The present invention relates to Machining of Ceramics technical field, be specifically related to self-cleaning thermal barrier coating of a kind of anti-contamination and preparation method thereof.
Background technology
Along with aero-gas turbine is to high flow capacity ratio, high thrust-weight ratio, high air inlet temperature future development, the working temperature in combustion chamber is considerably beyond the use temperature limit of Ni based high-temperature alloy.Prepare thermal barrier coating at superalloy matrix surface, holding warm ability to raising matrix has very directly effect, thus effectively improves the working temperature of part, increases the service life.
It is a kind ofly utilize the material that thermal conductivity is relatively low that thermal barrier coating leads to, and is coated on superalloy matrix surface thus plays the functional coating of heat-blocking action by suitable technology.Typical thermal barrier coating is made up of superalloy matrix, metal bonding coating and top heat insulating ceramic coat.Wherein, superalloy matrix mainly bears mechanical load; Tack coat mainly works to improve matrix and ceramic coating physical compatibility and antioxidant anticorrosive; Top ceramic layer Main Function is isolated heat and produces thermograde, and its heterogeneous microstructure plays a crucial role to the heat-proof quality of thermal barrier coating and work-ing life.But when thermal barrier coating is applied to the working temperature day by day increased, harsher Working environment will be faced, the obtained thermal barrier coating of prior art exist easily undergo phase transition, oxidation-resistance is low, intensity is little, poor high temperature stability, easily produce the defects such as high temperature corrosion, is difficult to meet the needs that turbine intake temperature improves further.Therefore, the focus that better heat-proof quality and good stability, elevated temperature corrosion resistant are excellent under the high temperature conditions novel heat barrier coat material become thermal barrier coating area research is in recent years found.
Summary of the invention
Object of the present invention is just to provide self-cleaning thermal barrier coating of a kind of anti-contamination and preparation method thereof, to overcome the deficiencies in the prior art.
The object of the present invention is achieved like this:
The self-cleaning thermal barrier coating of a kind of anti-contamination, it is characterized in that, be made up of the raw material of following weight part: cerium oxide 23-25, zirconium dioxide 27-29, yttrium oxide 35-37, nano titanium oxide 1.4-1.6, aluminium powder 8.1-9.5, epoxy soybean oil 4-6, NiCoCrAlYTa alloy powder 65-75, steel fiber 3-5, mica powder 10-13, terpine resin 5-7, cationic starch 4-6.
The preparation method of the described self-cleaning thermal barrier coating of a kind of anti-contamination, is characterized in that comprising the following steps:
(1) by nano titanium oxide, NiCoCrAlYTa alloy powder in 750-850 DEG C of pyroprocessing 30-50 minute, be cooled to room temperature rapidly, add cationic starch ultrasonic grinding 20-40 minute, be heated to melting, stir 5-8h, under vacuum atmosphere, condensation is shaping, obtained modified metal tack coat of pulverizing;
(2) aluminium powder, steel fiber are joined grinding in ball grinder 10-30 minute, the terpine resin spraying into molten state is mixed thoroughly, adds epoxy soybean oil, carries out ball milling, mixes, breaks up, dries obtained modified aluminium powder;
(3) by modified aluminium powder, cerium oxide, zirconium dioxide, yttrium oxide through 1490-1540 DEG C of high-temperature calcination 2-4 hour, cooling adds other remaining component and is ground to 200-300 order, obtained modified ceramic powder;
(4) by superalloy matrix after ultrasonic oil removing, sandblasting pre-treatment, by electron thermal explosion method by step (1) material even application on superalloy matrix;
(5) finally by air plasma spraying method, the spraying current of 500A is adopted to be deposited on metal bonding coating by obtained for step (3) modified ceramic powder.
The present invention has following beneficial effect: the thermal barrier coating that the present invention obtains is compared with traditional thermal barrier coating, add aluminium powder and improve the antioxidant property of ceramic phase and the perviousness with matrix metal through high-temperature calcination is modified, and some particles melts insufficient in plasma jet in spraying process, when clashing into matrix, deformation extent is slightly weak, the vesicular structure that easy formation overlaps, improve the thermal insulation of coating, secondly the present invention is by method of modifying, Y in zirconium dioxide lattice
3+, Ce
4+replace Zr
4+create the stress field of Lacking oxygen and local, add the phon scattering in lattice, thermal conductivity obviously reduces, and the nucleidic mass of solid solution atom Ce is far longer than the nucleidic mass of Y, can significantly improve the scattering strength of the phonon in product of the present invention, thus reduce thermal conductivity, coatingsurface hardness prepared by the present invention is high, good toughness is not easy to crack, layering, has anti-contamination automatically cleaning, anti-oxidant and high thermostability and good thermal shock performance.
Embodiment
The self-cleaning thermal barrier coating of the anti-contamination of described one, it is characterized in that, be made up of the raw material of following weight part: cerium oxide 23, zirconium dioxide 27, yttrium oxide 37, nano titanium oxide 1.6, aluminium powder 9.5, epoxy soybean oil 4, NiCoCrAlYTa alloy powder 75, steel fiber 5, mica powder 10, terpine resin 5, cationic starch 6.
Making method comprises the following steps:
(1) by nano titanium oxide, NiCoCrAlYTa alloy powder in 750-850 DEG C of pyroprocessing 30-50 minute, be cooled to room temperature rapidly, add cationic starch ultrasonic grinding 20-40 minute, be heated to melting, stir 5-8h, under vacuum atmosphere, condensation is shaping, obtained modified metal tack coat of pulverizing;
(2) aluminium powder, steel fiber are joined grinding in ball grinder 10-30 minute, the terpine resin spraying into molten state is mixed thoroughly, adds epoxy soybean oil, carries out ball milling, mixes, breaks up, dries obtained modified aluminium powder;
(3) by modified aluminium powder, cerium oxide, zirconium dioxide, yttrium oxide through 1490-1540 DEG C of high-temperature calcination 2-4 hour, cooling adds other remaining component and is ground to 200-300 order, obtained modified ceramic powder;
(4) by superalloy matrix after ultrasonic oil removing, sandblasting pre-treatment, by electron thermal explosion method by step (1) material even application on superalloy matrix;
(5) finally by air plasma spraying method, the spraying current of 500A is adopted to be deposited on metal bonding coating by obtained for step (3) modified ceramic powder.
The technical parameter index of the thermal barrier coating using the present invention to produce is as follows:
(1) coating porosity: 17.7%;
(2) record coating cross sections through metaloscope and have more closed hole and vertical micro--crack;
(3) temperature head by measuring coatingsurface and the sample back side calculates the heat-proof quality of coating, and increase rate has been up to about 51.8%.
Claims (4)
1. the self-cleaning thermal barrier coating of anti-contamination, it is characterized in that, be made up of the raw material of following weight part: cerium oxide 23-25, zirconium dioxide 27-29, yttrium oxide 35-37, nano titanium oxide 1.4-1.6, aluminium powder 8.1-9.5, epoxy soybean oil 4-6, NiCoCrAlYTa alloy powder 65-75, steel fiber 3-5, mica powder 10-13, terpine resin 5-7, cationic starch 4-6.
2. the making method of the self-cleaning thermal barrier coating of a kind of anti-contamination according to claim 1, is characterized in that comprising the following steps:
(1) by nano titanium oxide, NiCoCrAlYTa alloy powder in 750-850 DEG C of pyroprocessing 30-50 minute, be cooled to room temperature rapidly, add cationic starch ultrasonic grinding 20-40 minute, be heated to melting, stir 5-8h, under vacuum atmosphere, condensation is shaping, obtained modified metal tack coat of pulverizing;
(2) aluminium powder, steel fiber are joined grinding in ball grinder 10-30 minute, the terpine resin spraying into molten state is mixed thoroughly, adds epoxy soybean oil, carries out ball milling, mixes, breaks up, dries obtained modified aluminium powder;
(3) by modified aluminium powder, cerium oxide, zirconium dioxide, yttrium oxide through 1490-1540 DEG C of high-temperature calcination 2-4 hour, cooling adds other remaining component and is ground to 200-300 order, obtained modified ceramic powder;
(4) by superalloy matrix after ultrasonic oil removing, sandblasting pre-treatment, by electron thermal explosion method by step (1) material even application on superalloy matrix;
(5) finally by air plasma spraying method, the spraying current of 500A is adopted to be deposited on metal bonding coating by obtained for step (3) modified ceramic powder.
3. the making method of the self-cleaning thermal barrier coating of a kind of anti-contamination according to claim 2, is characterized in that, described metal bonding coating coating thickness is 100 μm, and ceramic layer coats thickness is 300 μm.
4. the making method of the self-cleaning thermal barrier coating of a kind of anti-contamination according to claim 2, is characterized in that, described superalloy matrix is K4169 superalloy.
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| CN201510495241.2A CN105112845A (en) | 2015-08-13 | 2015-08-13 | Stain-proof self-cleaning thermal barrier coating and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107604299A (en) * | 2017-09-11 | 2018-01-19 | 北京工业大学 | The composite and its coating production of a kind of heat insulating coat |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102351545A (en) * | 2011-04-07 | 2012-02-15 | 世林（漯河）冶金设备有限公司 | High temperature heat barrier material, coating, molded product and application thereof |
-
2015
- 2015-08-13 CN CN201510495241.2A patent/CN105112845A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102351545A (en) * | 2011-04-07 | 2012-02-15 | 世林（漯河）冶金设备有限公司 | High temperature heat barrier material, coating, molded product and application thereof |
Non-Patent Citations (1)
| Title |
|---|
| 吴子健等: "《热喷涂技术与应用》", 31 January 2006, 机械工业出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107604299A (en) * | 2017-09-11 | 2018-01-19 | 北京工业大学 | The composite and its coating production of a kind of heat insulating coat |
| CN107604299B (en) * | 2017-09-11 | 2020-03-13 | 北京工业大学 | Composite material for heat-insulating coating and preparation method of coating |
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Application publication date: 20151202 |
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