CN106045507A - Thermal-barrier-coating ceramics Ca3Sn4Ta4O21 and preparation method therefor - Google Patents

Thermal-barrier-coating ceramics Ca3Sn4Ta4O21 and preparation method therefor Download PDF

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CN106045507A
CN106045507A CN201610352286.9A CN201610352286A CN106045507A CN 106045507 A CN106045507 A CN 106045507A CN 201610352286 A CN201610352286 A CN 201610352286A CN 106045507 A CN106045507 A CN 106045507A
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carrying
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thermal
preparation
ceramics
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方亮
方维双
李纯纯
邓酩
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Guilin University of Technology
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Guilin University of Technology
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    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/495—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on vanadium, niobium, tantalum, molybdenum or tungsten oxides or solid solutions thereof with other oxides, e.g. vanadates, niobates, tantalates, molybdates or tungstates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
    • C04B35/632—Organic additives
    • C04B35/634—Polymers
    • C04B35/63404—Polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B35/63416—Polyvinylalcohols [PVA]; Polyvinylacetates
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
    • C04B2235/3208—Calcium oxide or oxide-forming salts thereof, e.g. lime
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3293—Tin oxides, stannates or oxide forming salts thereof, e.g. indium tin oxide [ITO]
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
    • C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Chemical Kinetics & Catalysis (AREA)

Abstract

The invention discloses a thermal-barrier-coating ceramic material Ca3Sn4Ta4O21 with low thermal conductivity and relatively high thermal expansion coefficient and a preparation method therefor. The preparation method comprises the steps: (1) weighing and proportioning original powder of CaCO3, SnO2 and Ta2O5 with the purity higher than 99.9% (weight percent) according to the composition of Ca3Sn4Ta4O21; (2) carrying out wet-type ball-milling mixing on the raw materials obtained in the step (1) for 12 hours, carrying out baking, and then, carrying out pre-burning for 6 hours in an atmospheric atmosphere at the temperature of 1,450 DEG C, wherein a ball-milling medium is distilled water; and (3) adding a binder into powder prepared in the step (2), carrying out granulating, then, carrying out compression molding, and finally, carrying out dead burning for 8 hours in an atmospheric atmosphere at the temperature of 1,500 DEG C to 1,600 DEG C, wherein the binder is a polyvinyl alcohol solution with the mass concentration of 5%, and the addition level of polyvinyl alcohol accounts for 3% the total mass of the powder. The ceramics prepared by the preparation method are good in sintering property and stable in structure, the thermal conductivity of the ceramics is far lower than that of YSZ, and the thermal expansion coefficient of the ceramics is far greater than that of the YSZ, so that the ceramics have an important application value in an advanced aeroengine thermal barrier coating system.

Description

A kind of thermal barrier coating pottery Ca3Sn4Ta4O21And preparation method thereof
Technical field
The present invention relates to lower thermal conductivity ceramic material, particularly relate to for protecting advanced turbogenerator high-temperature metal portion Thermal barrier coating ceramic material of part and preparation method thereof.
Background technology
Use thermal barrier coating system (Thermal prepared by plasma spraying method or electro beam physics vapour deposition technology Barrier Coatings, is called for short TBCs), owing to advanced turbogenerator high-temperature metal parts can be protected and improve fuel-economy Property, very important in the evolution of advanced aero engine.At present, traditional yittrium oxide energy PSZ (letter Claim YSZ) thermal barrier coating, at high temperature during long service, T-Tetragonal is converted into pros and Emission in Cubic, and cooled Cheng Zhong, T-phase will further be changed into monoclinic phase.This kind of phase transformation, by the sintering shrinkage of accelerometer finishing coat, reduces heat-proof quality.This Outward, low for YSZ thermal coefficient of expansion (about 10 × 10-6 K-1) (such as nickel-based superalloy, heat is swollen with metallic matrix for the coating that causes Swollen coefficient is about 16 × 10-6 K-1One of thermal expansion mismatch between), the strongest factor being acknowledged as coating failure.
In order to overcome the shortcoming of YSZ and improve efficiency of operation further, in the urgent need to developing a kind of thermal conductivity less than YSZ's Novel hot barrier coating pottery.The selection of novel heat barrier coat material is limited by some basic demands, such as high-melting-point, under arms temperature Spend in operating temperature range without phase transformation, relatively low thermal conductivity, higher thermal coefficient of expansion, good decay resistance, resist Thermal shock performance and relatively low caking power.But, find that a kind of to meet the ceramic material required extremely difficult simultaneously.Mesh Before, many research worker using relatively low thermal conductivity, higher thermal coefficient of expansion as selecting novel thermal barrier coating ceramic material The most important condition.
Summary of the invention
It is an object of the invention to provide a kind of thermal barrier coating ceramic material with lower thermal conductivity and higher thermal expansion coefficient And preparation method thereof.
The chemical composition of the thermal barrier coating pottery of the present invention is Ca3Sn4Ta4O21。
The preparation method step of this thermal barrier coating ceramic material is:
(1) be 99.9%(percentage by weight by purity) more than CaCO3、SnO2And Ta2O5Starting powder press Ca3Sn4Ta4O21 Composition weigh dispensing.
(2) being mixed 12 hours by step (1) raw material wet ball-milling, ball-milling medium is distilled water, big at 1450 DEG C after drying Pre-burning 6 hours in gas atmosphere.
(3), after adding binding agent pelletize in the powder that step (2) prepares, re-compacted molding, finally 1500 ~ 1600 DEG C air atmosphere sinters 8 hours；Described binding agent uses mass concentration to be the poly-vinyl alcohol solution of 5%, and polyvinyl alcohol adds Amount accounts for the 3% of powder gross mass.
Advantages of the present invention: Ca3Sn4Ta4O21Ceramic post sintering is good, Stability Analysis of Structures；When 1200 DEG C, its thermal conductivity is low arrives 1.21W.m-1.k-1, its thermal coefficient of expansion reaches 13.9 × 10-6 K-1。Ca3Sn4Ta4O21Pottery thermal conductivity far below YSZ, and its Thermal coefficient of expansion then much larger than YSZ, has important using value in heat barrier coat material field.
Detailed description of the invention
Embodiment:
Table 1 shows and constitutes 3 specific embodiments of different sintering temperatures of the present invention and thermal conductivity when 1200 DEG C thereof and heat The coefficient of expansion.Its preparation method is as it has been described above, test its thermal conductivity and thermal coefficient of expansion respectively by laser pulse method and push rod method. Result shows, the Ca of synthesis3Sn4Ta4O21Thermal conductivity during 1200 DEG C of pottery is far below YSZ (3.0W.m-1.k-1), and its heat is swollen Swollen coefficient then much larger than YSZ, is expected to become novel heat barrier coat material, can meet advanced aero engine thermal barrier coating system skill Art needs.
Table 1:

Claims (1)

1. a thermal barrier coating pottery, it is characterised in that the chemical composition of described thermal barrier coating pottery is: Ca3Sn4Ta4O21；
The preparation method of described thermal barrier coating pottery concretely comprises the following steps:
(1) be 99.9%(percentage by weight by purity) more than CaCO3、SnO2And Ta2O5Starting powder press Ca3Sn4Ta4O21 Composition weigh dispensing；
(2) being mixed 12 hours by step (1) raw material wet ball-milling, ball-milling medium is distilled water, at 1450 DEG C of air gas after drying Pre-burning 6 hours in atmosphere；
(3) after adding binding agent pelletize in the powder that step (2) prepares, re-compacted molding is finally big at 1500 ~ 1600 DEG C Gas atmosphere sinters 8 hours；Described binding agent uses mass concentration to be the poly-vinyl alcohol solution of 5%, and polyvinyl alcohol addition accounts for The 3% of powder gross mass.
CN201610352286.9A 2016-05-25 2016-05-25 Thermal-barrier-coating ceramics Ca3Sn4Ta4O21 and preparation method therefor Pending CN106045507A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108467265A (en) * 2018-03-19 2018-08-31 广东省新材料研究所 A kind of thermal barrier coating nucleocapsid powder and the preparation method and application thereof, engine components
CN112250440A (en) * 2020-10-23 2021-01-22 陕西天璇涂层科技有限公司 Method for preparing low-thermal-conductivity high-temperature thermal barrier ceramic CaWTa2O9 by solid phase method
CN113105237A (en) * 2021-04-30 2021-07-13 昆明理工大学 AB2O6 type tantalate ceramic and preparation method thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6258467B1 (en) * 2000-08-17 2001-07-10 Siemens Westinghouse Power Corporation Thermal barrier coating having high phase stability
CN1764613A (en) * 2003-03-26 2006-04-26 三菱重工业株式会社 Material for thermal barrier coating
CN1966462A (en) * 2006-11-24 2007-05-23 北京航空航天大学 Laminated perovskite structure heat-barrier coating ceramic layer material

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6258467B1 (en) * 2000-08-17 2001-07-10 Siemens Westinghouse Power Corporation Thermal barrier coating having high phase stability
CN1764613A (en) * 2003-03-26 2006-04-26 三菱重工业株式会社 Material for thermal barrier coating
CN1966462A (en) * 2006-11-24 2007-05-23 北京航空航天大学 Laminated perovskite structure heat-barrier coating ceramic layer material

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108467265A (en) * 2018-03-19 2018-08-31 广东省新材料研究所 A kind of thermal barrier coating nucleocapsid powder and the preparation method and application thereof, engine components
CN108467265B (en) * 2018-03-19 2020-04-28 广东省新材料研究所 Core-shell structure powder for thermal barrier coating, preparation method and application thereof, and engine component
CN112250440A (en) * 2020-10-23 2021-01-22 陕西天璇涂层科技有限公司 Method for preparing low-thermal-conductivity high-temperature thermal barrier ceramic CaWTa2O9 by solid phase method
CN113105237A (en) * 2021-04-30 2021-07-13 昆明理工大学 AB2O6 type tantalate ceramic and preparation method thereof
CN113105237B (en) * 2021-04-30 2023-02-17 昆明理工大学 AB2O6 type tantalate ceramic and preparation method thereof

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