CN105272181A - Preparation technology of composite ceramic core - Google Patents
Preparation technology of composite ceramic core Download PDFInfo
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- CN105272181A CN105272181A CN201510665557.1A CN201510665557A CN105272181A CN 105272181 A CN105272181 A CN 105272181A CN 201510665557 A CN201510665557 A CN 201510665557A CN 105272181 A CN105272181 A CN 105272181A
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Abstract
A preparation technology of a composite ceramic core comprises specific technological steps as follows: step one, preparing a hollow silicon dioxide based ceramic core; step two, preparing the composite ceramic core. The ceramic core adopts a composite structure, that is, the inner layer part, namely, the core part, of the ceramic core is made of an aluminum oxide based material, the outer layer part is made of a silicon dioxide based material, the high-performance composite ceramic core is prepared on the basis of good high-temperature performance of the aluminum oxide based material at the core part and the easy removal feature of the silicon dioxide based ceramic core on the outer layer, and comprehensive requirements of the efficient and air cooling polycrystal, directional and single-crystal blade casting processes for the ceramic core are met.
Description
Technical field
The invention belongs to technical field of high temperature alloy, particularly precision casting hollow turbine vane ceramic core technology of preparing.
Background technology
Along with the development of modern technical aeronautics, also more and more higher to the requirement of holding warm ability of blade.Adapting to the use temperature improved constantly in order to make turbine part, must hollow blade be adopted.Generally, the cavity of hollow blade adopts ceramic core to be formed.In castingprocesses, ceramic core need will have higher intensity, preferably creep resisting ability and good chemical stability in high temperature environments; Ceramic core also must be able to adopt chemical process to be easier to remove after blade casting simultaneously.At present, conventional ceramic core has two large classes, silicon-dioxide base ceramic core and alumina based ceramic core.Silica-based high-temperature performance is slightly poor, and core use temperature is low but easily remove; High-temperature performance of alumina-base ceramic core is good, and use temperature is high but remove difficulty.Therefore, how to prepare aborning and there is higher high-temperature behavior and the ceramic core easily removed is problem anxious to be resolved.
Summary of the invention
Goal of the invention: the preparation technology that the invention provides a kind of composite ceramic core, its objective is and the problem that solution is in the past existing meet needs prepared by hollow blade, for the preparation of polycrystalline, orientation and single crystal blade.
Technical scheme:
The preparation technology of composite ceramic core, is characterized in that:
Concrete technology: one, prepare hollow silicon dioxide base ceramic core, concrete: (1) prepares paraffinic base softening agent; (2) softening agent is melted, add the hot powder of silicon-dioxide gradually, stir while add powder limit, prepare slip; (3) injection molding is adopted to carry out ceramic core shaping, obtained ceramic core biscuit; (4) ceramic core is inserted sinter in aluminum oxide powder filler, obtained hollow silicon dioxide base ceramic core.Two, composite ceramic core is prepared, concrete: (1) adopts aluminum oxide powder and silicon sol to prepare aluminum oxide powder slip; (2) slip note (squeezing) is entered in the hollow silicon dioxide base ceramic core after sintering; (3) the silicon-dioxide base ceramic core noting (squeezing) and enter aluminum oxide powder slip is carried out drying, finally obtain composite ceramic core.
In present invention process, in paraffinic base softening agent, paraffin is 80-95%, and linear low density polyethylene mass percent is 1-5%, and all the other are beeswax or stearic acid;
Core ceramic powder is silicon dioxide base ceramic powder; Powder consists of thick silica powder and fine quartz powder, and the quality proportioning of the two is between 70:30-80:20;
In ceramic slurry, the quality of softening agent is 16-18% than content.
In present invention process, the injection molding mode of the shaping employing of ceramic size is shaping, and forming pressure is 0.4-0.8MPa, and inject time is 20-120 second, and the dwell time is 20-120 second;
The filler of ceramic core dewaxing and sintering is aluminium sesquioxide powder, and granularity is the industrial aluminum oxide powder of 100-300 object;
Ceramic core dewaxing stage adopts low temperature slowly to heat up sintering, temperature 500 DEG C-600 DEG C, soaking time 1-2 hour; The whole sintering stage adopts high temperature sintering, and sintering temperature is at 1190 DEG C-1250 DEG C, and soaking time 3-6 hour, then stove is chilled to room temperature.
In present invention process, aluminum oxide powder slip adopts high purity emergy and silicon sol to prepare, and its quality proportioning is between 4-8:1, and the granularity of emergy is 24-200 order.
In present invention process, alumina slurry adopts the mode injected or clamp-on to fill up the cavity of silicon-dioxide base ceramic core.
Composite ceramic core is dry 4-12 hour under temperature 22-25 DEG C of relative humidity 50%-70% condition.
Advantage and effect: the preparation technology that the invention provides a kind of composite ceramic core, ceramic core of the present invention adopts composite structure, both in ceramic core, layer segment (heart portion) was alumina-based material, and outer section is silica-based materials, by utilizing the feature that easily removes of the good high-temperature behavior of heart portion alumina-based material and outer silicon-dioxide base ceramic core to prepare high-performance composite ceramic core, meet the composite request to ceramic core in efficient air cooling polycrystalline, orientation and single crystal blade castingprocesses.
Accompanying drawing explanation
Fig. 1 is the composite ceramic core of preparation.
embodiment:
The present invention will be further described below:
embodiment one:
Prepare paraffinic base softening agent, wherein, Quality of Paraffin Waxes per-cent is 80%, and linear low density polyethylene is 1%, and all the other are beeswax; Core ceramic powder is silicon dioxide base ceramic powder; Powder consists of thick silica powder and fine quartz powder, and the quality proportioning of the two is 70:30; In ceramic slurry, the content of softening agent is 16%(mass ratio); Hollow ceramic core moulding adopts injection molding mode shaping, and forming pressure is 0.4MPa, and inject time is 20 seconds, and the dwell time is 120 seconds; The filler of the dewaxing of hollow ceramic core and sintering is aluminium sesquioxide powder, and granularity is the industrial aluminum oxide powder of 100 object; Ceramic core dewaxing stage adopts low temperature slowly to heat up sintering, temperature 500 DEG C, soaking time 1 hour; The whole sintering stage adopts high temperature sintering, sintering temperature at 1190 DEG C, soaking time 6 hours, then stove is chilled to room temperature; Aluminum oxide powder slip adopts high purity emergy and silicon sol to prepare, and its quality proportioning is between 8:1, and the granularity of emergy is 24 orders.Alumina slurry adopts the mode injected to fill up the cavity of silicon-dioxide base ceramic core.Composite ceramic core under temperature 22 DEG C of relative humidity 50% conditions dry 12 hours, the composite ceramic core of preparation is shown in Fig. 1.At the composite ceramic core 1500 DEG C of preparation, the deflection deformation amount of insulation after 30 minutes is less than 1 millimeter.The blade adopting this ceramic core to cast can remove ceramic core in 24 hours completely.
embodiment two
Prepare paraffinic base softening agent, wherein, Quality of Paraffin Waxes per-cent is 95%, and Low Density Polyethylene is 2%, and all the other are beeswax; Core ceramic powder is silicon dioxide base ceramic powder; Powder consists of thick silica powder and fine quartz powder, and the quality proportioning of the two is 80:20; In ceramic slurry, the content of softening agent is 18%(mass ratio); Hollow ceramic core moulding adopts injection molding mode shaping, and forming pressure is 0.8MPa, and inject time is 20 seconds, and the dwell time is 20 seconds; The filler of the dewaxing of hollow ceramic core and sintering is aluminium sesquioxide powder, and granularity is the industrial aluminum oxide powder of 200 object; Ceramic core dewaxing stage adopts low temperature slowly to heat up sintering, temperature 500 DEG C, soaking time 2 hours; The whole sintering stage adopts high temperature sintering, sintering temperature at 1200 DEG C, soaking time 6 hours, then stove is chilled to room temperature; Aluminum oxide powder slip adopts high purity emergy and silicon sol to prepare, and its quality proportioning is between 5:1, and the granularity of emergy is 100 orders.Alumina slurry adopts the mode clamp-oned to fill up in the cavity of silicon-dioxide base ceramic core.Composite ceramic core under temperature 25 DEG C of relative humidity 70% conditions dry 10 hours, finally obtains composite ceramic mould.At the composite ceramic core 1500 DEG C of preparation, the deflection deformation amount of insulation after 30 minutes is less than 0.5 millimeter.The blade adopting this ceramic core to cast can remove ceramic core in 24 hours completely.
embodiment three
Prepare paraffinic base softening agent, wherein, Quality of Paraffin Waxes per-cent is 95%, and Low Density Polyethylene is 2%, and all the other are stearic acid; Core ceramic powder is silicon dioxide base ceramic powder; Powder consists of thick silica powder and fine quartz powder, and the quality proportioning of the two is 75:25; In ceramic slurry, the content of softening agent is 16%(mass ratio); Hollow ceramic core moulding adopts injection molding mode shaping, and forming pressure is 0.6MPa, and inject time is 50 seconds, and the dwell time is 50 seconds; The filler of the dewaxing of hollow ceramic core and sintering is aluminium sesquioxide powder, and granularity is the industrial aluminum oxide powder of 150 object; Ceramic core dewaxing stage adopts low temperature slowly to heat up sintering, temperature 600 DEG C, soaking time 1 hour; The whole sintering stage adopts high temperature sintering, sintering temperature at 1210 DEG C, soaking time 4 hours, then stove is chilled to room temperature; Aluminum oxide powder slip adopts high purity emergy and silicon sol to prepare, and its quality proportioning is between 6:1, and the granularity of emergy is 60 orders.Alumina slurry adopts the mode injected to fill up the cavity of silicon-dioxide base ceramic core.Composite ceramic core under temperature 23 DEG C of relative humidity 60% conditions dry 8 hours, finally obtains composite ceramic mould.At the composite ceramic core 1500 DEG C of preparation, the deflection deformation amount of insulation after 30 minutes is less than 0.8 millimeter.The blade adopting this ceramic core to cast can remove ceramic core in 24 hours completely.
embodiment four
Prepare paraffinic base softening agent, wherein, Quality of Paraffin Waxes per-cent is 90%, and Low Density Polyethylene is 4%, and all the other are beeswax or stearic acid; Core ceramic powder is silicon dioxide base ceramic powder; Powder consists of thick silica powder and fine quartz powder, and the quality proportioning of the two is 70:30; In ceramic slurry, the content of softening agent is 18%(mass ratio); Hollow ceramic core moulding adopts injection molding mode shaping, and forming pressure is 0.8MPa, and inject time is 20 seconds, and the dwell time is 30 seconds; The filler of the dewaxing of hollow ceramic core and sintering is aluminium sesquioxide powder, and granularity is the industrial aluminum oxide powder of 200 object; Ceramic core dewaxing stage adopts low temperature slowly to heat up sintering, temperature 500 DEG C, soaking time 2 hours; The whole sintering stage adopts high temperature sintering, sintering temperature at 1190 DEG C, soaking time 6 hours, then stove is chilled to room temperature; Aluminum oxide powder slip adopts high purity emergy and silicon sol to prepare, and its quality proportioning is between 6:1, and the granularity of emergy is 80 orders.Alumina slurry adopts the mode injected to fill up the cavity of silicon-dioxide base ceramic core.Composite ceramic core under temperature 25 DEG C of relative humidity 70% conditions dry 8 hours, finally obtains composite ceramic mould.At the composite ceramic core 1500 DEG C of preparation, the deflection deformation amount of insulation after 30 minutes is less than 1 millimeter.The blade adopting this ceramic core to cast can remove ceramic core in 24 hours completely.
embodiment five
Prepare paraffinic base softening agent, wherein, Quality of Paraffin Waxes per-cent is 90%, and Low Density Polyethylene is 5%, and all the other are stearic acid; Core ceramic powder is silicon dioxide base ceramic powder; Powder consists of thick silica powder and fine quartz powder, and the quality proportioning of the two is 70:30; In ceramic slurry, the content of softening agent is 17%(mass ratio); Hollow ceramic core moulding adopts injection molding mode shaping, and forming pressure is 0.8MPa, and inject time is 120 seconds, and the dwell time is 30 seconds; The filler of the dewaxing of hollow ceramic core and sintering is aluminium sesquioxide powder, and granularity is the industrial aluminum oxide powder of 300 object; Ceramic core dewaxing stage adopts low temperature slowly to heat up sintering, temperature 500 DEG C, soaking time 2 hours; The whole sintering stage adopts high temperature sintering, sintering temperature at 1250 DEG C, soaking time 3 hours, then stove is chilled to room temperature; Aluminum oxide powder slip adopts high purity emergy and silicon sol to prepare, and its quality proportioning is between 4:1, and the granularity of emergy is 200 orders.Alumina slurry adopts the mode injected to fill up the cavity of silicon-dioxide base ceramic core.Composite ceramic core under temperature 25 DEG C of relative humidity 70% conditions dry 4 hours, finally obtains composite ceramic mould.At the composite ceramic core 1500 DEG C of preparation, the deflection deformation amount of insulation after 30 minutes is less than 1 millimeter.The blade adopting this ceramic core to cast can remove ceramic core in 24 hours completely.
Claims (5)
1. the preparation technology of composite ceramic core, is characterized in that:
Concrete technology: one, prepare hollow silicon dioxide base ceramic core, concrete: (1) prepares paraffinic base softening agent; (2) softening agent is melted, add the hot powder of silicon-dioxide gradually, stir while add powder limit, prepare slip; (3) injection molding is adopted to carry out ceramic core shaping, obtained ceramic core biscuit; (4) ceramic core is inserted sinter in aluminum oxide powder filler, obtained hollow silicon dioxide base ceramic core;
Two, composite ceramic core is prepared, concrete: (1) adopts aluminum oxide powder and silicon sol to prepare aluminum oxide powder slip; (2) slip note (squeezing) is entered in the hollow silicon dioxide base ceramic core after sintering; (3) the silicon-dioxide base ceramic core noting (squeezing) and enter aluminum oxide powder slip is carried out drying, finally obtain composite ceramic core.
2. the preparation technology of composite ceramic core according to claim 1, is characterized in that:
In present invention process, in paraffinic base softening agent, paraffin is 80-95%, and linear low density polyethylene mass percent is 1-5%, and all the other are beeswax or stearic acid;
Core ceramic powder is silicon dioxide base ceramic powder; Powder consists of thick silica powder and fine quartz powder, and the quality proportioning of the two is between 70:30-80:20;
In ceramic slurry, the quality of softening agent is 16-18% than content.
3. the preparation technology of composite ceramic core according to claim 1, is characterized in that:
In present invention process, the injection molding mode of the shaping employing of ceramic size is shaping, and forming pressure is 0.4-0.8MPa, and inject time is 20-120 second, and the dwell time is 20-120 second;
The filler of ceramic core dewaxing and sintering is aluminium sesquioxide powder, and granularity is the industrial aluminum oxide powder of 100-300 object;
Ceramic core dewaxing stage adopts low temperature slowly to heat up sintering, temperature 500 DEG C-600 DEG C, soaking time 1-2 hour; The whole sintering stage adopts high temperature sintering, and sintering temperature is at 1190 DEG C-1250 DEG C, and soaking time 3-6 hour, then stove is chilled to room temperature.
4. the preparation technology of composite ceramic core according to claim 1, is characterized in that:
In present invention process, aluminum oxide powder slip adopts high purity emergy and silicon sol to prepare, and its quality proportioning is between 4-8:1, and the granularity of emergy is 24-200 order.
5. the preparation technology of composite ceramic core according to claim 1, is characterized in that:
In present invention process, alumina slurry adopts the mode injected or clamp-on to fill up the cavity of silicon-dioxide base ceramic core;
Composite ceramic core is dry 4-12 hour under temperature 22-25 DEG C of relative humidity 50%-70% condition.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108275988A (en) * | 2018-03-01 | 2018-07-13 | 辽宁航安特铸材料有限公司 | A kind of improved silicon-base ceramic core preparation method |
| CN109622894A (en) * | 2018-12-28 | 2019-04-16 | 东方电气集团东方汽轮机有限公司 | A kind of manufacturing method of the ceramic core with quartz glass bar |
| CN109632455A (en) * | 2018-11-29 | 2019-04-16 | 中国科学院金属研究所 | A kind of detection method of ceramic core sintering warpage amount |
| CN113149688A (en) * | 2020-01-23 | 2021-07-23 | 上海交通大学 | Composite ceramic with honeycomb fiber structure and preparation method thereof |
| CN114178510A (en) * | 2020-09-14 | 2022-03-15 | 通用电气公司 | Method for casting a component having an easily removable casting core |
| CN114505450A (en) * | 2022-02-24 | 2022-05-17 | 安徽应流航源动力科技有限公司 | Composite ceramic rod for casting and molding top cover hole of hollow single crystal blade, manufacturing method and application |
| CN114804842A (en) * | 2022-05-11 | 2022-07-29 | 西安交通大学 | Preparation method of ceramic core with controllable pore distribution and atmosphere |
| CN114988852A (en) * | 2022-05-13 | 2022-09-02 | 潍坊科技学院 | Preparation method of ceramic core with multilayer sandwich structure |
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| CN102815940A (en) * | 2012-08-29 | 2012-12-12 | 天津大学 | Calcium oxide and zirconium oxide composite ceramic core for niobium-silicon based alloy investment casting |
| CN103242036A (en) * | 2012-02-14 | 2013-08-14 | 中国科学院金属研究所 | Method for preparing composite ceramic core |
| CN104086161A (en) * | 2014-04-29 | 2014-10-08 | 中国科学院金属研究所 | Making method of silicon-based ceramic core with adjustable thermal expansion coefficient |
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| CN103242036A (en) * | 2012-02-14 | 2013-08-14 | 中国科学院金属研究所 | Method for preparing composite ceramic core |
| CN102815940A (en) * | 2012-08-29 | 2012-12-12 | 天津大学 | Calcium oxide and zirconium oxide composite ceramic core for niobium-silicon based alloy investment casting |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108275988A (en) * | 2018-03-01 | 2018-07-13 | 辽宁航安特铸材料有限公司 | A kind of improved silicon-base ceramic core preparation method |
| CN108275988B (en) * | 2018-03-01 | 2021-01-15 | 辽宁航安特铸材料有限公司 | Improved preparation method of silicon-based ceramic core |
| CN109632455A (en) * | 2018-11-29 | 2019-04-16 | 中国科学院金属研究所 | A kind of detection method of ceramic core sintering warpage amount |
| CN109622894A (en) * | 2018-12-28 | 2019-04-16 | 东方电气集团东方汽轮机有限公司 | A kind of manufacturing method of the ceramic core with quartz glass bar |
| CN109622894B (en) * | 2018-12-28 | 2020-05-19 | 东方电气集团东方汽轮机有限公司 | Manufacturing method of ceramic core with quartz glass rod |
| CN113149688A (en) * | 2020-01-23 | 2021-07-23 | 上海交通大学 | Composite ceramic with honeycomb fiber structure and preparation method thereof |
| CN114178510A (en) * | 2020-09-14 | 2022-03-15 | 通用电气公司 | Method for casting a component having an easily removable casting core |
| CN114178510B (en) * | 2020-09-14 | 2023-11-14 | 通用电气公司 | Method for casting a component having a casting core that is easy to remove |
| CN114505450A (en) * | 2022-02-24 | 2022-05-17 | 安徽应流航源动力科技有限公司 | Composite ceramic rod for casting and molding top cover hole of hollow single crystal blade, manufacturing method and application |
| CN114505450B (en) * | 2022-02-24 | 2023-04-18 | 安徽应流航源动力科技有限公司 | Composite ceramic rod for casting and molding top cover hole of hollow single crystal blade, manufacturing method and application |
| CN114804842A (en) * | 2022-05-11 | 2022-07-29 | 西安交通大学 | Preparation method of ceramic core with controllable pore distribution and atmosphere |
| CN114804842B (en) * | 2022-05-11 | 2022-12-09 | 西安交通大学 | Preparation method of ceramic core with controllable pore distribution and atmosphere |
| CN114988852A (en) * | 2022-05-13 | 2022-09-02 | 潍坊科技学院 | Preparation method of ceramic core with multilayer sandwich structure |
| CN114988852B (en) * | 2022-05-13 | 2023-09-05 | 潍坊科技学院 | Preparation method of ceramic core with multilayer sandwich structure |
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