CN114260999A - Method for increasing strength of weak part of large-scale oriented single crystal ceramic by embedding platinum wire - Google Patents
Method for increasing strength of weak part of large-scale oriented single crystal ceramic by embedding platinum wire Download PDFInfo
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- CN114260999A CN114260999A CN202111654312.0A CN202111654312A CN114260999A CN 114260999 A CN114260999 A CN 114260999A CN 202111654312 A CN202111654312 A CN 202111654312A CN 114260999 A CN114260999 A CN 114260999A
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- ceramic
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- ceramic core
- platinum wire
- core
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- 239000000919 ceramic Substances 0.000 title claims abstract description 95
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 239000013078 crystal Substances 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000003825 pressing Methods 0.000 claims abstract description 26
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 238000007493 shaping process Methods 0.000 claims abstract description 6
- 239000002002 slurry Substances 0.000 claims abstract description 6
- 238000009966 trimming Methods 0.000 claims abstract description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000005245 sintering Methods 0.000 claims description 5
- 238000012797 qualification Methods 0.000 abstract description 5
- 238000002360 preparation method Methods 0.000 abstract description 3
- 230000007547 defect Effects 0.000 description 3
- 241001391944 Commicarpus scandens Species 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 239000010431 corundum Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
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- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The invention relates to a method for increasing the strength of a weak part of large-scale oriented single crystal ceramic by inlaying a platinum wire, which comprises the following steps: arranging a placing groove on a ceramic core mould corresponding to the weak part of the large-scale oriented single crystal ceramic; placing a mould on a core pressing machine, installing the mould, opening the mould through the core pressing machine, placing a platinum wire into a placing groove, closing the mould through the core pressing machine, filling ceramic slurry into an inner cavity of the mould through the core pressing machine, shaping, opening the mould, and taking out a ceramic core; placing the ceramic core into a roasting furnace for roasting, and cooling along with the furnace after roasting is finished; and removing the redundant flash and the platinum wire on the surface of the ceramic core by using a trimming tool. The method can meet the preparation requirement of the directional monocrystalline hollow turbine blade, and can improve the qualification rate of the directional monocrystalline hollow turbine blade to 50-70%.
Description
Technical Field
The invention belongs to the technical field of production methods of large-scale oriented single crystal ceramic cores, and particularly relates to a method for increasing the strength of a weak part of large-scale oriented single crystal ceramic by embedding a platinum wire.
Background
Thin walls and thin columns of large-scale oriented single crystal ceramic cores are the weak positions which are most easy to break or crack, and the process enhancement is urgently needed, and the existing method for improving the strength mainly comprises the step of adding a glass rod or a corundum rod. However, the glass rod and the corundum rod have the defect of high brittleness, and basically do not work for the problem of breakage of the ceramic core of the large-sized oriented single crystal hollow turbine blade, so that the qualification rate of the oriented single crystal hollow turbine blade is greatly reduced and is only 20-35%.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a method for increasing the strength of a weak part of large-scale oriented monocrystalline ceramic by adopting a platinum wire embedded, which has simple process steps and can greatly improve the qualification rate of the oriented monocrystalline hollow turbine blade after use.
According to the technical scheme provided by the invention, the method for increasing the strength of the weak part of the large-scale oriented single crystal ceramic by adopting the inlaid platinum wire comprises the following steps:
s1, arranging 1-3 parallel placing grooves on the ceramic core mould corresponding to the weak part of the large-scale oriented single crystal ceramic, wherein the depth of the placing grooves is controlled to be 3-5mm, and the groove width is controlled to be 0.6-1.2 mm;
s2, placing the ceramic core mould on a core pressing machine, installing the ceramic core mould, opening the ceramic core mould through the core pressing machine, placing a cylindrical platinum wire with the diameter of 0.6-1.2mm into a ceramic core mould placing groove, closing the ceramic core mould through the core pressing machine, filling ceramic slurry into an inner cavity of the ceramic core mould through the core pressing machine, shaping for 3-5 minutes, opening the mould, taking out the ceramic core, and placing for 12-16 hours;
s3, placing the ceramic core into a roasting furnace for roasting, controlling the roasting temperature at 1100-1250 ℃, controlling the roasting time at 1-5 hours, and cooling the ceramic core along with the furnace after roasting and sintering;
and S4, removing the excessive flash and the platinum wire on the surface of the ceramic core by using a trimming tool, thereby finishing the manufacture of the ceramic core.
Preferably, in step S2, the platinum wire has a diameter of 0.7-0.9 mm.
More preferably, in step S2, the diameter of the platinum wire is 0.8 mm.
The method can ensure that the ceramic core is not broken in the wax pressing and pouring processes of the directional monocrystalline hollow turbine blade, thereby meeting the preparation requirement of the directional monocrystalline hollow turbine blade and improving the qualification rate of the directional monocrystalline hollow turbine blade to 50-70%.
Detailed Description
The present invention will be further described with reference to the following specific examples.
Example 1
A method for increasing the strength of a weak part of large-scale directional single crystal ceramic by inlaying a platinum wire comprises the following steps:
s1, arranging 3 parallel placing grooves on the ceramic core mould corresponding to the weak part of the large-scale oriented single crystal ceramic, wherein the depth of the placing grooves is controlled to be 4mm, and the groove width is controlled to be 1.0 mm;
s2, placing the ceramic core mould on a core pressing machine, installing the ceramic core mould, opening the ceramic core mould through the core pressing machine, placing a cylindrical platinum wire with the diameter of 0.9mm into a ceramic core mould placing groove, closing the ceramic core mould through the core pressing machine, filling ceramic slurry into an inner cavity of the ceramic core mould through the core pressing machine, shaping for 3 minutes, opening the mould, taking out the ceramic core, and placing for 12 hours;
s3, placing the ceramic core into a roasting furnace for roasting, controlling the roasting temperature at 1100 ℃ and the roasting time at 3 hours, and cooling the ceramic core along with the furnace after roasting and sintering;
and S4, removing the excessive flash and the platinum wire on the surface of the ceramic core by using a trimming tool, thereby finishing the manufacture of the ceramic core.
Example 2
A method for increasing the strength of a weak part of large-scale directional single crystal ceramic by inlaying a platinum wire comprises the following steps:
s1, arranging 2 parallel placing grooves on the ceramic core mould corresponding to the weak part of the large-scale oriented single crystal ceramic, wherein the depth of the placing grooves is controlled to be 3mm, and the groove width is controlled to be 0.8 mm;
s2, placing the ceramic core mould on a core pressing machine, installing the ceramic core mould, opening the ceramic core mould through the core pressing machine, placing a cylindrical platinum wire with the diameter of 0.7mm into a ceramic core mould placing groove, closing the ceramic core mould through the core pressing machine, filling ceramic slurry into an inner cavity of the ceramic core mould through the core pressing machine, shaping for 4 minutes, opening the mould, taking out the ceramic core, and placing for 14 hours;
s3, placing the ceramic core into a roasting furnace for roasting, controlling the roasting temperature at 1200 ℃, controlling the roasting time at 4 hours, and cooling the ceramic core along with the furnace after the roasting and sintering are finished;
and S4, removing the excessive flash and the platinum wire on the surface of the ceramic core by using a trimming tool, thereby finishing the manufacture of the ceramic core.
Example 3
A method for increasing the strength of a weak part of large-scale directional single crystal ceramic by inlaying a platinum wire comprises the following steps:
s1, arranging 1 placing groove on the ceramic core mould corresponding to the weak part of the large-scale oriented single crystal ceramic, wherein the depth of the placing groove is controlled to be 3mm, and the groove width is controlled to be 0.9 mm;
s2, placing the ceramic core mould on a core pressing machine, installing the ceramic core mould, opening the ceramic core mould through the core pressing machine, placing a cylindrical platinum wire with the diameter of 0.8mm into a ceramic core mould placing groove, closing the ceramic core mould through the core pressing machine, filling ceramic slurry into an inner cavity of the ceramic core mould through the core pressing machine, shaping for 5 minutes, opening the mould, taking out the ceramic core, and placing for 12 hours;
s3, placing the ceramic core into a roasting furnace for roasting, controlling the roasting temperature at 1250 ℃, controlling the roasting time at 3 hours, and cooling the ceramic core along with the furnace after roasting and sintering;
and S4, removing the excessive flash and the platinum wire on the surface of the ceramic core by using a trimming tool, thereby finishing the manufacture of the ceramic core.
According to the invention, the platinum wire which is high in strength, good in toughness and not easy to break is embedded to increase the weak part of the large-scale directional monocrystalline ceramic, the platinum wire has super toughness, the defect of large brittleness of the ceramic core is overcome, the ceramic core cannot be broken in the wax pressing and pouring processes of the directional monocrystalline hollow turbine blade, the platinum wire is high in strength and high in melting point, and cannot be broken or melted in the processes, so that the preparation requirement of the directional monocrystalline hollow turbine blade can be met, and the qualification rate of the directional monocrystalline hollow turbine blade can be improved to 50% -70%.
Claims (3)
1. A method for increasing the strength of a weak part of large-scale directional monocrystalline ceramic by embedding a platinum wire is characterized by comprising the following steps:
s1, arranging 1-3 parallel placing grooves on the ceramic core mould corresponding to the weak part of the large-scale oriented single crystal ceramic, wherein the depth of the placing grooves is controlled to be 3-5mm, and the groove width is controlled to be 0.6-1.2 mm;
s2, placing the ceramic core mould on a core pressing machine, installing the ceramic core mould, opening the ceramic core mould through the core pressing machine, placing a cylindrical platinum wire with the diameter of 0.6-1.2mm into a ceramic core mould placing groove, closing the ceramic core mould through the core pressing machine, filling ceramic slurry into an inner cavity of the ceramic core mould through the core pressing machine, shaping for 3-5 minutes, opening the mould, taking out the ceramic core, and placing for 12-16 hours;
s3, placing the ceramic core into a roasting furnace for roasting, controlling the roasting temperature at 1100-1250 ℃, controlling the roasting time at 1-5 hours, and cooling the ceramic core along with the furnace after roasting and sintering;
and S4, removing the excessive flash and the platinum wire on the surface of the ceramic core by using a trimming tool, thereby finishing the manufacture of the ceramic core.
2. The method for increasing the strength of the weak part of the large oriented single crystal ceramic by adopting the inlaid platinum wire as claimed in claim 1, which is characterized in that: in step S2, the diameter of the platinum wire is 0.7-0.9 mm.
3. The method for increasing the strength of the weak part of the large oriented single crystal ceramic by adopting the inlaid platinum wire as claimed in claim 2, which is characterized in that: in step S2, the diameter of the platinum wire is 0.8 mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111654312.0A CN114260999A (en) | 2021-12-31 | 2021-12-31 | Method for increasing strength of weak part of large-scale oriented single crystal ceramic by embedding platinum wire |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111654312.0A CN114260999A (en) | 2021-12-31 | 2021-12-31 | Method for increasing strength of weak part of large-scale oriented single crystal ceramic by embedding platinum wire |
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| CN114260999A true CN114260999A (en) | 2022-04-01 |
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| CN202111654312.0A Pending CN114260999A (en) | 2021-12-31 | 2021-12-31 | Method for increasing strength of weak part of large-scale oriented single crystal ceramic by embedding platinum wire |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9902285D0 (en) * | 1999-02-03 | 1999-03-24 | Rolls Royce Plc | A ceramic core,a disposable pattern,a method of making a disposable pattern,a method of making a ceramic shell mould and a method of casting |
| US20050199365A1 (en) * | 2003-07-21 | 2005-09-15 | Rolf Pfeifer | Reinforced casting cores for metal casting, manufacture and use |
| CN1827256A (en) * | 2006-04-14 | 2006-09-06 | 清华大学 | Method for direct production of core in narrow groove and blind hole of wax mould |
| CN103386703A (en) * | 2013-07-24 | 2013-11-13 | 中国南方航空工业(集团)有限公司 | Forming method for ceramic die core |
| CN104647586A (en) * | 2013-11-19 | 2015-05-27 | 中国科学院金属研究所 | Production method of composite ceramic core for single crystal hollow blade of complex structure |
| CN110723966A (en) * | 2019-11-13 | 2020-01-24 | 中国航发南方工业有限公司 | Preparation method of fan-shaped flaky ceramic core |
| CN111036847A (en) * | 2019-12-27 | 2020-04-21 | 安徽应流航源动力科技有限公司 | Method for preventing core deviation of directional blade of heavy gas turbine |
-
2021
- 2021-12-31 CN CN202111654312.0A patent/CN114260999A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9902285D0 (en) * | 1999-02-03 | 1999-03-24 | Rolls Royce Plc | A ceramic core,a disposable pattern,a method of making a disposable pattern,a method of making a ceramic shell mould and a method of casting |
| US20050199365A1 (en) * | 2003-07-21 | 2005-09-15 | Rolf Pfeifer | Reinforced casting cores for metal casting, manufacture and use |
| CN1827256A (en) * | 2006-04-14 | 2006-09-06 | 清华大学 | Method for direct production of core in narrow groove and blind hole of wax mould |
| CN103386703A (en) * | 2013-07-24 | 2013-11-13 | 中国南方航空工业(集团)有限公司 | Forming method for ceramic die core |
| CN104647586A (en) * | 2013-11-19 | 2015-05-27 | 中国科学院金属研究所 | Production method of composite ceramic core for single crystal hollow blade of complex structure |
| CN110723966A (en) * | 2019-11-13 | 2020-01-24 | 中国航发南方工业有限公司 | Preparation method of fan-shaped flaky ceramic core |
| CN111036847A (en) * | 2019-12-27 | 2020-04-21 | 安徽应流航源动力科技有限公司 | Method for preventing core deviation of directional blade of heavy gas turbine |
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Application publication date: 20220401 |