CN101182196A - Method for preparing magnesium-based lanthanum aluminate thermal barrier coating - Google Patents
Method for preparing magnesium-based lanthanum aluminate thermal barrier coating Download PDFInfo
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- CN101182196A CN101182196A CNA2007101868717A CN200710186871A CN101182196A CN 101182196 A CN101182196 A CN 101182196A CN A2007101868717 A CNA2007101868717 A CN A2007101868717A CN 200710186871 A CN200710186871 A CN 200710186871A CN 101182196 A CN101182196 A CN 101182196A
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- thermal barrier
- barrier coating
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Abstract
The invention relates to a preparation method of a magnesium based lanthanum aluminates thermal barrier coating material, which belongs to the material field and is characterized in that materials are prepared according to the LaMgAl11O19 stoichiometry The preparation method is: firstly, alumina pellets are used as grinding media to wetly mill materials in a polyurethane ball milling tank, and the materials are dried and molded through being pressed by a mold; secondly a molded body is pre-fired in a high temperature furnace to obtain a pre-fired block body; thirdly, the pre-fired block body is grinded and the grinded pre-fired raw materials are added with MgO fine powders; the grinded pre-fired raw materials and the MgO fine powders are put in the polyurethane ball milling tank for the wet ball milling through the alumina pellets to obtain ceramic slurry; fourthly, the ceramic slurry is dried in a dry oven and granulated, and the granulated raw materials are formed through isostatic pressing; the formed green body is sintered for 6-24h at 1550-1700 DEG C to obtain high pure magnesium based lanthanum aluminates ceramic material which can be used as target material for making the thermal barrier coating through the EB-PVD method.
Description
One, technical field
The present invention relates to a kind of preparation method of magnesium-based lanthanum aluminate thermal barrier coating, belong to the material field.
Two, background technology
Along with the development of aerospace industry, engine develops with big impellent direction to having high thrust-weight ratio, and the major measure of employing is to improve the turbine inlet temperature.This makes the high temperature alloy of original manufacturing aircraft engine can not meet the demands.For improving the use temperature of engine, the practice that generally adopts is the transition alloy layer of turbine rotor blade, turning vane, the turbine disk, combustion chamber heat end pieces surface elder generation's coating one deck such as NiCrAlY etc. at aircraft engine and all kinds of internal combustion turbine at present, is coated with thereon and carries out one deck 6～8% yttrium oxide (Y
2O
3) partially stabilized zirconium white (ZrO
2) (Y-PSZ) heat barrier coat material, to reduce the temperature of engine body material, prevent oxidation, the corrosion of engine body material, improve the working temperature of engine, prolong the life-span of engine.Yet Y-PSZ base heat barrier coat material has following shortcoming: 1) when use temperature is higher than 1100 ℃, the coating easy-sintering, tiny crack and micropore in the coating can heal, and cause the ceramic coating densification, cause the variation of coated material volume, not matching of the stress of aggravation coating and matrix further causes the generation of holiday.2) surpass 700 ℃ when use temperature, a large amount of oxygen rooms can be quickened the oxonium ion transmission and be caused the quick oxidation of metal bonding coating in the Y-PSZ thermal barrier coating, and its volume is increased, and stress increases, and final thermal barrier coating lost efficacy.3) along with the rising of working temperature, crystal conversion takes place in this class material about 1170 ℃, change cubic phase mutually into by monocline.3%～6% the thermal stresses that causes thus also can promotes oxidn zirconium base thermal barrier coating at high temperature failure.Above-mentioned shortcoming is that the present aircraft engine working temperature of restriction improves, hinders " bottleneck " place that aerospace industry further develops.
Magnesium base six lanthanum aluminate (LaMgAl
11O
19) base ceramic material at high temperature, especially when temperature＞1100 ℃, have thermal conductivity and the shrinking percentage lower than Y-PSZ, do not having transformation temperature below 2000 ℃, have good thermostability; In its structure, measure seldom in the oxygen room, and high temperature can suppress the diffusion of Sauerstoffatom down effectively, therefore is expected to be used to prepare thermal barrier coating.
At present, magnesium base lanthanum aluminate adopts conventional oxide ceramic production technology preparation more: by behind the both required oxide raw materials of certainty ratio weighing, make through ball milling, drying and sinter process subsequently, and simple for process.Yet, when adopting above-mentioned technology, because the fluctuation of raw material composition in the roasting process is difficult to prepare high-purity magnesium base lanthanum aluminate stupalith.
Three, summary of the invention
The object of the present invention is to provide a kind of method for preparing high-purity magnesium-based lanthanum aluminate thermal barrier coating.
The present invention proposes the method for the synthetic high-purity magnesium base lanthanum aluminate of a kind of two-step approach.
Raw material is pressed LaMgAl
11O
19Stoichiometric ratio is prepared burden.Wherein: raw materials of magnesium oxide is: magnesium oxide or magnesium hydroxide or magnesiumcarbonate; Alumina raw material is: Y-aluminum oxide or aluminium hydroxide; Lanthanum oxide material is: lanthanum trioxide or Phosbloc or lanthanum hydroxide.With alumina balls is grinding element wet ball grinding 12～24h in the urethane ball grinder.(bake out temperature: 60～100 ℃) carries out compression molding after the slurry drying.In High Temperature Furnaces Heating Apparatus, under 1450～1600 ℃ temperature, carry out pre-burning 5～12h, obtain the pre-burning block.After the pulverizing of pre-burning block, the adding massfraction is 0.002～0.015 MgO fine powder.Then, put into the urethane ball grinder and carry out wet ball grinding, obtain ceramic size with alumina balls.With this ceramic size in loft drier after 60～100 ℃ of following dryings, carry out granulation, utilize isostatic pressing.Base substrate obtains high-purity magnesium base lanthanum aluminate stupalith at 1550～1700 ℃ of sintering 6～24h.This material can be used as the target that the EB-PVD legal system is equipped with thermal barrier coating.
Characteristics of the present invention are:
1) adopt two step method to be prepared;
2) after the pre-burning, in raw material, add 0.002～0.015 MgO with the volatilization at high temperature of supplemental magnesium;
Four, description of drawings
Fig. 1 is the X-ray diffraction result of synthetic magnesium base lanthanum aluminate stupalith of the present invention;
Fig. 2 is a synthetic magnesium base lanthanum aluminate stupalith thermal diffusivity of the present invention.
Five, embodiment
Embodiment 1:
Press LaMgAl
11O
19Stoichiometric ratio is prepared burden.Raw materials used being respectively of preparation 1kg magnesium base lanthanum aluminate: lanthanum trioxide La
2O
3213.34 gram, magnesium oxide MgO52.75 gram, aluminium hydroxide Al (OH)
31123.09 gram.The various raw materials of weighing being put into the urethane ball grinder, add an amount of distilled water (or dehydrated alcohol), is grinding element ball milling 18h with alumina balls.Slurry is put into loft drier, dry 14h under 90 ℃ temperature.Under 20MPa pressure, carry out compression molding.Formed body obtains the pre-burning body in 1550 ℃ of following pre-burning 10h in air.The pre-burning body adds the MgO fine powder of massfraction 0.005 after crushed, puts into the urethane ball grinder, is medium wet-milling 24h with distilled water (or dehydrated alcohol), obtains ceramic size.Ceramic size is dry 24h under 80 ℃, adds an amount of PVA aqueous solution afterwards and carries out granulation.Mold pressing premolding under 20MPa utilizes cold isostatic press at the 200MPa compacted under then.In air,, obtain high-purity LaMgAl in 1600 ℃ of following sintering 20h
11O
19Heat barrier coat material.
Embodiment 2:
Press LaMgAl
11O
19Stoichiometric ratio is prepared burden, raw materials used being respectively of preparation 1kg magnesium base lanthanum aluminate: lanthanum trioxide La (OH)
3248.60 gram, magnesium hydroxide Mg (OH)
276.34 gram, aluminium hydroxide Al (OH)
31123.09 gram.The various raw materials of weighing being put into the urethane ball grinder, add an amount of distilled water (or dehydrated alcohol), is grinding element ball milling 14h with alumina balls.Slurry is put into baking oven, dry 20h under 80 ℃ temperature.Under 20MPa pressure, carry out compression molding.Formed body obtains the pre-burning body in 1570 ℃ of following pre-burning 8h in air.The pre-burning body adds massfraction and is 0.008 MgO fine powder after crushed, puts into the urethane ball grinder, is medium wet-milling 24h with the dehydrated alcohol, obtains ceramic size.Ceramic size is dry 24h under 70 ℃, adds an amount of PVA aqueous solution afterwards and carries out granulation.Mold pressing premolding under 20MPa utilizes cold isostatic press at the 200MPa compacted under then.In air,, obtain high-purity LaMgAl in 1650 ℃ of following sintering 12h
11O
19Heat barrier coat material.
Embodiment 3:
Press LaMgAl
11O
19Stoichiometric ratio is prepared burden, raw materials used being respectively of preparation 1kg magnesium base lanthanum aluminate: Phosbloc La
2(CO
3)
3.8H
2The O393.96 gram, magnesium oxide MgO52.75 gram, gama-alumina γ-Al
2O
3734.02 gram.The various raw materials of weighing being put into the urethane ball grinder, add an amount of distilled water (or dehydrated alcohol), is grinding element ball milling 22h with alumina balls.Slurry is put into baking oven, dry 20h under 90 ℃ temperature.Under 20MPa pressure, carry out compression molding.Formed body is at 1550 ℃ of following pre-burning 8h, and sintering atmosphere is an oxidizing atmosphere.The pre-burning body adds the MgO fine powder of massfraction 0.012 after crushed, puts into the urethane ball grinder, is medium wet-milling 24h with the dehydrated alcohol, obtains ceramic size.Ceramic size is dry 20h under 80 ℃, adds an amount of PVA aqueous solution afterwards and carries out granulation.Mold pressing premolding under 20MPa utilizes cold isostatic press at the 200MPa compacted under then.In air,, obtain high-purity LaMgAl in 1680 ℃ of following sintering 6h
11O
19Heat barrier coat material.
Claims (1)
1. the preparation method of magnesium-based lanthanum aluminate thermal barrier coating is characterized in that: press LaMgAl
11O
19Stoichiometric ratio is prepared burden:
Wherein: raw materials of magnesium oxide is: magnesium oxide or magnesium hydroxide or magnesiumcarbonate;
Alumina raw material is: Y-aluminum oxide or aluminium hydroxide;
Lanthanum oxide material is: lanthanum trioxide or Phosbloc or lanthanum hydroxide;
The preparation method is as follows:
1) with alumina balls be grinding element wet ball grinding 12～24h in the urethane ball grinder, the oven dry slurry, bake out temperature: 60～100 ℃, compression molding;
2) formed body carries out pre-burning 5～12h under 1450～1600 ℃ temperature in High Temperature Furnaces Heating Apparatus, obtains the pre-burning block;
3) above-mentioned pre-burning block is pulverized, the adding massfraction is 0.002～0.015 MgO fine powder in the pre-burning raw material after pulverizing; Then, put into the urethane ball grinder and carry out wet ball grinding, obtain ceramic size with alumina balls;
4) above-mentioned ceramic size is dry in loft drier, temperature: 60～100 ℃, carry out granulation then, the prepared using isostatic pressing after the granulation; The base substrate of moulding obtains high-purity magnesium base lanthanum aluminate stupalith at 1550～1700 ℃ of sintering 6～24h; This stupalith can be used as the target that the EB-PVD legal system is equipped with thermal barrier coating.
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|---|---|---|---|
| CNB2007101868717A CN100551870C (en) | 2007-11-21 | 2007-11-21 | The preparation method of magnesium-based lanthanum aluminate thermal barrier coating |
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|---|---|---|---|
| CNB2007101868717A CN100551870C (en) | 2007-11-21 | 2007-11-21 | The preparation method of magnesium-based lanthanum aluminate thermal barrier coating |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102295455A (en) * | 2011-06-09 | 2011-12-28 | 上海大学 | Preparation method of LaAlO3 ceramic substrate material |
| CN102086504B (en) * | 2009-12-08 | 2012-07-11 | 沈阳临德陶瓷研发有限公司 | Method for manufacturing high-density magnesium oxide target |
| CN102815927A (en) * | 2012-08-27 | 2012-12-12 | 哈尔滨工业大学 | Hexaaluminate high-emissivity thermal protection coating layer and preparation method thereof |
| CN102826837A (en) * | 2012-09-12 | 2012-12-19 | 中国地质大学（北京） | LaMgAl11O19-ZrO2-Al2O3 complex-phase wear-resistant ceramic material |
| CN106243905A (en) * | 2016-08-25 | 2016-12-21 | 代长华 | A kind of high-temperature-resistant insulating paint and preparation method thereof |
| CN108203844A (en) * | 2018-01-09 | 2018-06-26 | 上海应用技术大学 | Tantalic acid magnesium serial crystal and preparation method thereof |
| CN112661510A (en) * | 2021-01-11 | 2021-04-16 | 内蒙古科技大学 | Lanthanum aluminate green ceramic and preparation method and application thereof |
| CN116003156A (en) * | 2022-11-24 | 2023-04-25 | 浙江锦诚新材料股份有限公司 | MgAlON ceramic filter with multiple pore structures for magnesium alloy and preparation method thereof |
-
2007
- 2007-11-21 CN CNB2007101868717A patent/CN100551870C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102086504B (en) * | 2009-12-08 | 2012-07-11 | 沈阳临德陶瓷研发有限公司 | Method for manufacturing high-density magnesium oxide target |
| CN102295455A (en) * | 2011-06-09 | 2011-12-28 | 上海大学 | Preparation method of LaAlO3 ceramic substrate material |
| CN102815927A (en) * | 2012-08-27 | 2012-12-12 | 哈尔滨工业大学 | Hexaaluminate high-emissivity thermal protection coating layer and preparation method thereof |
| CN102815927B (en) * | 2012-08-27 | 2013-09-25 | 哈尔滨工业大学 | Preparation method of hexaaluminate high-emissivity thermal protection coating layer |
| CN102826837A (en) * | 2012-09-12 | 2012-12-19 | 中国地质大学（北京） | LaMgAl11O19-ZrO2-Al2O3 complex-phase wear-resistant ceramic material |
| CN106243905A (en) * | 2016-08-25 | 2016-12-21 | 代长华 | A kind of high-temperature-resistant insulating paint and preparation method thereof |
| CN108203844A (en) * | 2018-01-09 | 2018-06-26 | 上海应用技术大学 | Tantalic acid magnesium serial crystal and preparation method thereof |
| CN108203844B (en) * | 2018-01-09 | 2021-03-19 | 上海应用技术大学 | Magnesium tantalate series crystal and its preparing process |
| CN112661510A (en) * | 2021-01-11 | 2021-04-16 | 内蒙古科技大学 | Lanthanum aluminate green ceramic and preparation method and application thereof |
| CN116003156A (en) * | 2022-11-24 | 2023-04-25 | 浙江锦诚新材料股份有限公司 | MgAlON ceramic filter with multiple pore structures for magnesium alloy and preparation method thereof |
| CN116003156B (en) * | 2022-11-24 | 2023-11-28 | 浙江锦诚新材料股份有限公司 | MgAlON ceramic filter with multiple pore structures for magnesium alloy and preparation method thereof |
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|---|---|
| CN100551870C (en) | 2009-10-21 |
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Assignee: Maanshan Dingtai Rare Earth& New Materials Co., Ltd. Assignor: University of Science and Technology of Inner Mongolia Contract record no.: 2011340000083 Denomination of invention: Method for preparing magnesium-based lanthanum aluminate thermal barrier coating Granted publication date: 20091021 License type: Exclusive License Open date: 20080521 Record date: 20110704 |
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Granted publication date: 20091021 Termination date: 20131121 |