CN105063537A - Inflaming retarding and corrosion resisting thermal barrier coating and manufacturing method thereof - Google Patents
Inflaming retarding and corrosion resisting thermal barrier coating and manufacturing method thereof Download PDFInfo
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- CN105063537A CN105063537A CN201510495368.4A CN201510495368A CN105063537A CN 105063537 A CN105063537 A CN 105063537A CN 201510495368 A CN201510495368 A CN 201510495368A CN 105063537 A CN105063537 A CN 105063537A
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Abstract
The invention discloses an inflaming retarding and corrosion resisting thermal barrier coating. Aluminum powder is added and modified through high-temperature calcination, and therefore oxidation resistance performance and permeability of base metal of a ceramic phase can be improved. In the spraying process, part of particles are not molten sufficiently in the plasma jet flow, the transformation degree is slightly weak in the base body collision process, porous structures in lap joint together are easily formed, and the thermal insulation performance of the coating is improved. In addition, by means of a modification method, Zr4+ is replaced by Y3+ and Ce4+ in a zirconium dioxide crystal lattice, and the oxygen vacancy and the local stress field are produced. The phonon scattering in the crystal lattice is increased, and the thermal conductivity is obviously reduced. The atomic weight of the solid solution atom Ce is far larger than that of Y, the scattering strength of phonons in a product can be obviously improved, and therefore the thermal conductivity is reduced. The prepared coating is low in water absorbing rate, good in tenacity and not prone to cracking or layering and has the inflaming retarding corrosion resistance, abrasion resistance and good thermal shock performance.
Description
Technical field
The present invention relates to Machining of Ceramics technical field, be specifically related to a kind of fire-retardant corrosion-resistant thermal barrier coating 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 a kind of fire-retardant corrosion-resistant thermal barrier coating and preparation method thereof, to overcome the deficiencies in the prior art.
The object of the present invention is achieved like this:
A kind of fire-retardant corrosion-resistant thermal barrier coating, it is characterized in that, be made up of the raw material of following weight part: cerium oxide 24-27, zirconium dioxide 28-30, yttrium oxide 31-33, nanometer silicon carbide 1.1-1.4, aluminium powder 7.5-9.3, aluminium hydroxide 2-3, NiCoCrAlYTa alloy powder 67-78, organo montmorillonite 20-21, silica gel 5-7, magnesium sulfate 1-2.
The preparation method of described a kind of fire-retardant corrosion-resistant thermal barrier coating, is characterized in that comprising the following steps:
(1) by nanometer silicon carbide, NiCoCrAlYTa alloy powder in 740-810 DEG C of pyroprocessing 30-50 minute, be cooled to room temperature rapidly, add magnesium sulfate 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 is joined in ball mill, spray into silica gel and mix thoroughly, add aluminium hydroxide, carry out ball milling under normal temperature, mix, break up, dry obtained modified aluminium powder;
(3) by modified aluminium powder, cerium oxide, zirconium dioxide, yttrium oxide through 1450-1500 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, coating water-intake rate prepared by the present invention is low, good toughness is not easy to crack, layering, has fire-retardant corrosion-resistant, wear-resisting and good thermal shock performance.
Embodiment
The fire-retardant corrosion-resistant thermal barrier coating of described one, it is characterized in that, be made up of the raw material of following weight part: cerium oxide 26, zirconium dioxide 29, yttrium oxide 32, nanometer silicon carbide 1.1, aluminium powder 7.5, aluminium hydroxide 2, NiCoCrAlYTa alloy powder 69, organo montmorillonite 20, silica gel 7, magnesium sulfate 2.
Making method comprises the following steps:
(1) by nanometer silicon carbide, NiCoCrAlYTa alloy powder in 740-810 DEG C of pyroprocessing 30-50 minute, be cooled to room temperature rapidly, add magnesium sulfate 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 is joined in ball mill, spray into silica gel and mix thoroughly, add aluminium hydroxide, carry out ball milling under normal temperature, mix, break up, dry obtained modified aluminium powder;
(3) by modified aluminium powder, cerium oxide, zirconium dioxide, yttrium oxide through 1450-1500 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: 19.3%;
(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 52.1%.
Claims (4)
1. a fire-retardant corrosion-resistant thermal barrier coating, it is characterized in that, be made up of the raw material of following weight part: cerium oxide 24-27, zirconium dioxide 28-30, yttrium oxide 31-33, nanometer silicon carbide 1.1-1.4, aluminium powder 7.5-9.3, aluminium hydroxide 2-3, NiCoCrAlYTa alloy powder 67-78, organo montmorillonite 20-21, silica gel 5-7, magnesium sulfate 1-2.
2. the making method of a kind of fire-retardant corrosion-resistant thermal barrier coating according to claim 1, is characterized in that comprising the following steps:
(1) by nanometer silicon carbide, NiCoCrAlYTa alloy powder in 740-810 DEG C of pyroprocessing 30-50 minute, be cooled to room temperature rapidly, add magnesium sulfate 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 is joined in ball mill, spray into silica gel and mix thoroughly, add aluminium hydroxide, carry out ball milling under normal temperature, mix, break up, dry obtained modified aluminium powder;
(3) by modified aluminium powder, cerium oxide, zirconium dioxide, yttrium oxide through 1450-1500 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 a kind of fire-retardant corrosion-resistant thermal barrier coating according to claim 2, it 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 a kind of fire-retardant corrosion-resistant thermal barrier coating according to claim 2, it is characterized in that, described superalloy matrix is K4169 superalloy.
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN111441010A (en) * | 2020-04-26 | 2020-07-24 | 广东省新材料研究所 | Nano composite thermal barrier coating, preparation method and application thereof, and pulling and straightening roller |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
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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 |
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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 |
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吴子健等: "《热喷涂技术与应用》", 31 January 2006 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111441010A (en) * | 2020-04-26 | 2020-07-24 | 广东省新材料研究所 | Nano composite thermal barrier coating, preparation method and application thereof, and pulling and straightening roller |
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