CN108178637A - A kind of yttrium oxide single crystal casting ceramic core and preparation method - Google Patents

A kind of yttrium oxide single crystal casting ceramic core and preparation method Download PDF

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Publication number
CN108178637A
CN108178637A CN201611120139.5A CN201611120139A CN108178637A CN 108178637 A CN108178637 A CN 108178637A CN 201611120139 A CN201611120139 A CN 201611120139A CN 108178637 A CN108178637 A CN 108178637A
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ceramic core
yttrium oxide
single crystal
oxide
crystal casting
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吴学坤
许壮志
薛健
张明
初小葵
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LIAONING FAKU COUNTY CERAMIC ENGINEERING TECHNOLOGY RESEARCH CENTER
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LIAONING FAKU COUNTY CERAMIC ENGINEERING TECHNOLOGY RESEARCH CENTER
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Priority to CN201611120139.5A priority Critical patent/CN108178637A/en
Publication of CN108178637A publication Critical patent/CN108178637A/en
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    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores
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    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/50—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on rare-earth compounds
    • C04B35/505—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on rare-earth compounds based on yttrium oxide
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    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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    • 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
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    • 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
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    • 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
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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
    • C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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    • C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
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    • C04B2235/5208—Fibers
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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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)
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  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

A kind of yttrium oxide single crystal casting ceramic core and preparation method, by following raw materials by weight through dispensing, sieving, mixing, heating, stirring, cooling, molding, fired again form.Wherein, the raw material consists of the following compositions, yttrium oxide 70 80%, aluminium oxide 7.5 11.5%, Zirconium oxide fibre 1 3%, paraffin 9.5 14.5%, beeswax 0.1 0.2%, polyethylene 0.25 0.35%, oleic acid 0.4 0.7%, stearic acid 0.5 0.7%.The present invention is suitble to be reached as high as 1700 DEG C with the ceramic core of injection molding technique continuous production complicated shape, the operating temperature of manufactured ceramic core, fully met requirement of the single crystal casting to ceramic core, expands the use scope of ceramic core.

Description

A kind of yttrium oxide single crystal casting ceramic core and preparation method
Technical field
The present invention relates to a kind of ceramic cores available for single crystal casting, are mainly used in precision casting technology field.
Background technology
As the adapter for forming precision castings hollow lumen structure, act on is ceramic core：Form the inner cavity of precision castings Shape, and with the dimensional accuracy of epimorph and formwork common guarantee precision castings wall thickness.After the completion of casting casting, by machinery or change Corrosion is learned to remove ceramic core from casting.As melted module precise casting technology is from equiax crystal is cast, directional casting develops to Single crystal casting, pouring temperature are continuously improved, and higher requirement is proposed to core performance.The casting of prior art equiax crystal, orientation The temperature in use of castable ceramic core is only 1500 DEG C -1550 DEG C, far from the requirement for meeting 1600-1650 DEG C of single crystal casting.
Invention content
The present invention mainly solves the relatively low skill of the temperature in use of existing castable ceramic core for the purpose of solving the above problems Art problem, and can be reached by providing a kind of temperature in use by 1600-1650 DEG C, meet the ceramic core of single crystal casting requirement.
To achieve the above object, the technical solution adopted by the present invention is：Single crystal casting ceramic core is pressed by following raw materials Weight percent forms, wherein yttrium oxide 70-80%, aluminium oxide 7.5-11.5%, Zirconium oxide fibre 1-3%, paraffin 9.5- 14.5%, beeswax 0.1-0.2%, polyethylene 0.25-0.35%, oleic acid 0.4-0.7%, stearic acid 0.5-0.7%.
The preparation method of the ceramic core is as follows：Yttrium oxide, aluminium oxide cross 325 mesh standard sieves respectively, take lower part of screen point.So It is mixed afterwards in following ratios：Yttrium oxide 70-80%, aluminium oxide 7.5-11.5%, Zirconium oxide fibre 1-3%, oleic acid 0.4- It is spare in 105 DEG C of heating powder to be made within 2 hours after 0.7%, stearic acid 0.5-0.7% mixing；Paraffin 9.5-14.5%, beeswax 0.1-0.2%, polyethylene 0.25-0.35% are uniformly mixed at 120 DEG C, and it is spare that plasticizer is made in 325 mesh standard sieves excessively. Batch mixer is warming up to 130 DEG C, and addition prepares plasticizer, then adds in the above-mentioned powder mixed while stirring, and powder is whole Continue stirring 12 hours after adding, pour out cooling and material ingot is made.If above-mentioned material ingot is made with ceramic core molding machine according to mold The ceramic core green compact of form shape.Ceramic core is made through 1210-1400 DEG C of roasting in green compact.
The features of the present invention and advantageous effect
The present invention is suitble to the ceramic core with injection molding technique continuous production complicated shape, the work of manufactured ceramic core 1700 DEG C are reached as high as temperature, requirement of the single crystal casting to ceramic core has been fully met, has expanded ceramic core Use scope.
Specific embodiment
Embodiment one
Yttrium oxide 80%, aluminium oxide 7.75% are taken, Zirconium oxide fibre 1% crosses 325 mesh standard sieves respectively, takes lower part of screen point It is mixed with stearic acid 0.6%, oleic acid 0.7%, it is spare in 105 DEG C of heating 2 hours after mixing, take paraffin 9.5%, beeswax 0.2%, Polyethylene 0.25% is uniformly mixed at 120 DEG C, and it is spare that plasticizer is made in 325 mesh standard sieves excessively.Batch mixer is warming up to 130 DEG C, addition prepares plasticizer, then adds in the above-mentioned powder mixed while stirring, powder continues stirring 12 after all adding Hour, it pours out cooling and material ingot is made.
Embodiment two
Yttrium oxide 70.05%, aluminium oxide 11.5% are taken, Zirconium oxide fibre 2% crosses 325 mesh standard sieves, takes lower part of screen respectively Point mixed with stearic acid 0.7%, oleic acid 0.7%, heated after mixing at 105 DEG C 2 hours it is spare, take paraffin 14.5%, beeswax 0.2%, polyethylene 0.35% is uniformly mixed at 120 DEG C, and it is spare that plasticizer is made in 325 mesh standard sieves excessively.Batch mixer is heated up To 130 DEG C, addition prepares plasticizer, then adds in the above-mentioned powder mixed while stirring, powder continues after all adding Stirring 12 hours, pours out cooling and material ingot is made.
Embodiment three
Yttrium oxide 75.9%, aluminium oxide 10% are taken, Zirconium oxide fibre 3% crosses 325 mesh standard sieves respectively, takes lower part of screen point It is mixed with stearic acid 0.3%, oleic acid 0.5%, it is spare in 105 DEG C of heating 2 hours after mixing, take paraffin 10%, beeswax 0.25%, Polyethylene 0.05% is uniformly mixed at 120 DEG C, and it is spare that plasticizer is made in 325 mesh standard sieves excessively.Batch mixer is warming up to 130 DEG C, addition prepares plasticizer, then adds in the above-mentioned powder mixed while stirring, powder continues stirring 12 after all adding Hour, it pours out cooling and material ingot is made.
Above-mentioned material ingot is made with ceramic core molding machine according to mold the ceramic core green compact of several shapes.Green compact pass through 1210-1400 DEG C of roasting, is made ceramic core.
Ceramic core prepared by the present invention：Bending strength>35MPa, 1700 DEG C of maximum operation (service) temperature, shrinking percentage<0.5%.

Claims (5)

1. a kind of yttrium oxide single crystal casting ceramic core, it is characterised in that：It is made of following raw materials by weight, wherein Yttrium oxide 70-80%, aluminium oxide 7.5-11.5%, Zirconium oxide fibre 1-3%, paraffin 9.5-14.5%, beeswax 0.1-0.2%, Polyethylene 0.25-0.35%, oleic acid 0.4-0.7%, stearic acid 0.5-0.7%.
2. yttrium oxide single crystal casting ceramic core as described in claim 1, it is characterised in that：By following raw materials by weight hundred Divide than composition, yttrium oxide 80%, aluminium oxide 7.75%, Zirconium oxide fibre 1%, stearic acid 0.6%, oleic acid 0.7%, paraffin 9.5%, beeswax 0.2%, polyethylene 0.25%.
3. yttrium oxide single crystal casting ceramic core as described in claim 1, it is characterised in that：By following raw materials by weight hundred Divide than composition, yttrium oxide 70.05%, aluminium oxide 11.5%, Zirconium oxide fibre 2%, stearic acid 0.7%, oleic acid 0.7%, paraffin 14.5%, beeswax 0.2%, polyethylene 0.35%.
4. yttrium oxide single crystal casting ceramic core as described in claim 1, it is characterised in that：By following raw materials by weight hundred Divide than composition, yttrium oxide 75.9%, aluminium oxide 10%, Zirconium oxide fibre 3%, stearic acid 0.3%, oleic acid 0.5%, paraffin 10%, beeswax 0.25%, polyethylene 0.05%.
5. the preparation method of the yttrium oxide single crystal casting ceramic core as described in claim 1 to 5 any one is prepared, it is special Sign is:Yttrium oxide, aluminium oxide cross 325 mesh standard sieves respectively, take lower part of screen point, are then mixed in following ratios：Yttrium oxide 70- 80%, aluminium oxide 7.5-11.5%, Zirconium oxide fibre 1-3%, oleic acid 0.4-0.7%, stearic acid 0.5-0.7% mixing after It is spare that powder is made in 2 hours in 105 DEG C of heating；Paraffin 9.5-14.5%, beeswax 0.1-0.2%, polyethylene 0.25-0.35%, It is uniformly mixed at 120 DEG C, crossing 325 mesh standard sieves, to be made plasticizer spare, batch mixer is warming up to 130 DEG C, addition prepares increasing Agent is moulded, then adds in the above-mentioned powder mixed while stirring, powder continues stirring 12 hours after all adding, pour out cooling system Into material ingot, above-mentioned material ingot is made with ceramic core molding machine according to mold the ceramic core green compact of several shapes, green compact are through 1210- 1400 DEG C of roastings, are made ceramic core.
CN201611120139.5A 2016-12-08 2016-12-08 A kind of yttrium oxide single crystal casting ceramic core and preparation method Withdrawn CN108178637A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109053194A (en) * 2018-07-18 2018-12-21 上海交通大学 Directional solidification niobium silicon-base alloy hollow turbine vane ceramic core preparation method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5394933A (en) * 1992-06-19 1995-03-07 Agency Of Industrial Science & Technology Core for casting titanium and titanium alloy
US5580837A (en) * 1993-11-02 1996-12-03 Pcc Airfoils, Inc. Ceramic material for use in casting reactive metals
CN101372421A (en) * 2008-09-27 2009-02-25 辽宁省轻工科学研究院特铸材料有限公司 Yttria ceramic core material for casting single crystal and moulding preparation thereof
CN101429023A (en) * 2008-12-05 2009-05-13 辽宁省轻工科学研究院特铸材料有限公司 Compound zirconia ceramics core material employing inorfil
CN103242036A (en) * 2012-02-14 2013-08-14 中国科学院金属研究所 Method for preparing composite ceramic core
CN104446475A (en) * 2013-09-18 2015-03-25 辽宁省轻工科学研究院 Ceramic core for single-crystal casting

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5394933A (en) * 1992-06-19 1995-03-07 Agency Of Industrial Science & Technology Core for casting titanium and titanium alloy
US5580837A (en) * 1993-11-02 1996-12-03 Pcc Airfoils, Inc. Ceramic material for use in casting reactive metals
CN101372421A (en) * 2008-09-27 2009-02-25 辽宁省轻工科学研究院特铸材料有限公司 Yttria ceramic core material for casting single crystal and moulding preparation thereof
CN101429023A (en) * 2008-12-05 2009-05-13 辽宁省轻工科学研究院特铸材料有限公司 Compound zirconia ceramics core material employing inorfil
CN103242036A (en) * 2012-02-14 2013-08-14 中国科学院金属研究所 Method for preparing composite ceramic core
CN104446475A (en) * 2013-09-18 2015-03-25 辽宁省轻工科学研究院 Ceramic core for single-crystal casting

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109053194A (en) * 2018-07-18 2018-12-21 上海交通大学 Directional solidification niobium silicon-base alloy hollow turbine vane ceramic core preparation method

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Application publication date: 20180619