CN103242036B - Method for preparing composite ceramic core - Google Patents
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- CN103242036B CN103242036B CN201210032969.8A CN201210032969A CN103242036B CN 103242036 B CN103242036 B CN 103242036B CN 201210032969 A CN201210032969 A CN 201210032969A CN 103242036 B CN103242036 B CN 103242036B
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- 239000000919 ceramic Substances 0.000 title claims abstract description 88
- 239000002131 composite material Substances 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 21
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 16
- 238000005245 sintering Methods 0.000 claims abstract description 13
- 239000002002 slurry Substances 0.000 claims abstract description 11
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 7
- 238000000465 moulding Methods 0.000 claims abstract description 7
- 239000000843 powder Substances 0.000 claims description 56
- 238000002360 preparation method Methods 0.000 claims description 30
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 25
- 238000003756 stirring Methods 0.000 claims description 17
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 claims description 16
- 239000004902 Softening Agent Substances 0.000 claims description 15
- -1 polyethylene Polymers 0.000 claims description 14
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 13
- 239000004698 Polyethylene Substances 0.000 claims description 12
- 239000012188 paraffin wax Substances 0.000 claims description 12
- 229920000573 polyethylene Polymers 0.000 claims description 12
- 239000013543 active substance Substances 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 10
- 235000012239 silicon dioxide Nutrition 0.000 claims description 10
- 229910052782 aluminium Inorganic materials 0.000 claims description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 9
- 239000004411 aluminium Substances 0.000 claims description 9
- 239000000945 filler Substances 0.000 claims description 9
- 229960001866 silicon dioxide Drugs 0.000 claims description 7
- 235000019809 paraffin wax Nutrition 0.000 claims description 6
- 235000019271 petrolatum Nutrition 0.000 claims description 6
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 claims description 5
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 claims description 5
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 claims description 5
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 claims description 5
- 239000005642 Oleic acid Substances 0.000 claims description 5
- 238000007605 air drying Methods 0.000 claims description 5
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid group Chemical group C(CCCCCCC\C=C/CCCCCCCC)(=O)O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 claims description 5
- 230000003647 oxidation Effects 0.000 claims description 5
- 238000007254 oxidation reaction Methods 0.000 claims description 5
- 238000010792 warming Methods 0.000 claims description 5
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 4
- 238000001746 injection moulding Methods 0.000 claims description 4
- 229910052726 zirconium Inorganic materials 0.000 claims description 4
- 235000021355 Stearic acid Nutrition 0.000 claims description 2
- 235000013871 bee wax Nutrition 0.000 claims description 2
- 239000012166 beeswax Substances 0.000 claims description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 2
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 2
- 239000008117 stearic acid Substances 0.000 claims description 2
- 238000001816 cooling Methods 0.000 abstract description 12
- 229910010293 ceramic material Inorganic materials 0.000 abstract description 2
- 238000002791 soaking Methods 0.000 abstract description 2
- 238000001035 drying Methods 0.000 abstract 1
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 7
- 238000005452 bending Methods 0.000 description 6
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 4
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 4
- 239000004202 carbamide Substances 0.000 description 4
- 238000009766 low-temperature sintering Methods 0.000 description 4
- 239000005011 phenolic resin Substances 0.000 description 4
- 229920001568 phenolic resin Polymers 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000010453 quartz Substances 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000001311 chemical methods and process Methods 0.000 description 2
- 238000005495 investment casting Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention provides a method for preparing a composite ceramic core. An inner layer of the composite ceramic core is made from a silica-based material, and an outer layer of the composite ceramic core is made from an alumina-based or yttria-based ceramic material. The method provided by the invention mainly comprises the steps of preparing slurry, molding, baking, soaking, drying, sintering and the like. By adopting the method for preparing the composite ceramic core, provided by the invention, the composite ceramic core which has high strength and is easy to remove is prepared, and the need that airplane engine turbine blades are prepared in an efficient cooling manner is met.
Description
Technical field
The invention belongs to field of ceramic material preparation, particularly precision casting aircraft engine turbine blade 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 aircraft engine turbine blade, in general, before turbine, the every raising of inlet temperature is 100 ℃, and motor power can increase by 10% left and right; For inlet temperature before the turbine that turbine part is adapted to improve constantly, must improve from following two aspects the working temperature of turbine blade, the one, improve the warm ability of holding of blade material itself, the 2nd, by improving blade cooling structure, improve the cooling performance of blade.Up to the present, the high temperature capabilities of bearing of blade material has had large increase, but compares with blade actual demand, also far can not reach requirement, therefore, need to constantly update blade cooling structure, improves blade cooling performance, meets the requirement of advanced engine.
The typical feature of efficient air cooling blade is that blade has cavity structure, and this cavity structure is very complicated, traditional technology Leaf adopts the method preparation of precision casting, the cavity of blade need adopt ceramic core to form, ceramic core will have higher intensity under hot environment, higher creep resisting ability, after blade casting, also must be able to adopt chemical process easily to remove simultaneously, therefore, ceramic core will have suitable density, if density is too low, hot strength and creep resisting ability obviously decline, if density is too high, be unfavorable for removing of ceramic core, therefore, the preparation ceramic core that has higher high-temperature behavior and easily adopt chemical process to remove, also will keep certain porosity when needing to keep the intensity of ceramic core, and this contradiction has been brought sizable difficulty to the preparation of ceramic core.
Summary of the invention
Object of the present invention: in order addressing the above problem, to the invention provides a kind of method of preparing the ceramic core that there is high strength and easily remove, to have met the needs that high efficiency cooling is prepared aircraft engine turbine blade.
Concrete technology of the present invention:
1, prepare softening agent: by paraffin or its mixture melt, under this state, add gradually polyethylene, constantly stir, be warming up to 120 ℃-160 ℃, until polyethylene is dissolved in paraffin completely, after stirring, filter, standby;
2, prepare silica slurry: by softening agent fusing, add gradually the hot powder of silicon-dioxide, limit adds powder limit to stir, and stirs and also will add the tensio-active agent of 0.5%-1.0%, churning time 2-8 hour simultaneously;
3, internal layer ceramic core moulding: silica slurry temperature is controlled to 100-140 ℃, adopts injection molding to carry out the moulding of internal layer ceramic core;
4, roasting: internal layer ceramic core is packed in aluminum oxide powder filler and carries out roasting, and burning temperature is eventually 1150-1190 ℃, time 3-5 hour;
5, preparation aluminum oxide or yttrium oxide or Zirconia Slurry: slip be combined as aluminum oxide powder and aluminium colloidal sol or yttrium oxide powder and yttrium oxide colloidal sol or zirconium white and zirconium colloidal sol composition;
6, soak, be dried: ceramic core is immersed in to 2-6 hour in aluminum oxide or yttrium oxide or Zirconia Slurry under condition of negative pressure, then in air, is dried;
7, sintering: dried ceramic core is carried out to sintering again, and burning temperature is eventually 1350-1550 ℃, and time 20-60 minute, finally makes composite ceramic core.
In technique of the present invention, in softening agent, Quality of Paraffin Waxes per-cent is 80-95%, and polyethylene is 2-5%, and all the other are beeswax or stearic acid;
In technique of the present invention, internal layer core ceramic powder is silicon dioxide base ceramic powder;
In technique of the present invention, the tensio-active agent adding in silicon dioxide base ceramic powder is oleic acid or other aliphatic alcohols materials;
In technique of the present invention, the moulding of silicon dioxide base ceramic size adopts injection molding mode moulding, and forming pressure is 0.4-0.8MPa, and be 20-120 second inject time, and the dwell time is 20-120 second;
In technique of the present invention, the softening agent in silicon-dioxide base ceramic core adopts stuffing means to remove, and filler adopts aluminium sesquioxide powder, and granularity is the industrial oxidation aluminium powder of 100-300 order;
In technique of the present invention, the silicon-dioxide base ceramic core dewaxing stage adopts the low temperature sintering that slowly heats up, and temperature is lower than 500 ℃; The whole sintering stage adopts high temperature sintering, and silica-based sintering is at 1150 ℃-1190 ℃, soaking time 3-5 hour, and then stove is chilled to room temperature;
In technique of the present invention, aluminum oxide or yttrium oxide or the Zirconia Slurry of preparation, be combined as aluminum oxide powder and aluminium colloidal sol or yttrium oxide and the yttrium oxide colloidal sol or zirconium white and zirconium colloidal sol of slip form, powder liquid mass ratio is (1-2): 1, the particle diameter of powder is 100nm-1000nm, and in colloidal sol, size of particles is 5-20nm;
In technique of the present invention, internal layer ceramic core carries out aluminum oxide or yttrium oxide or Zirconia Slurry and soaks under condition of negative pressure, and pressure is 0.01-0.05MPa;
In technique of the present invention, internal layer ceramic core soaks after aluminum oxide or yttrium oxide or Zirconia Slurry, need under 22-24 ℃ of relative humidity 50%-70% condition, be dried 4-12 hour, then ceramic core is soaked again and is dried, repeat this process 2-5 time, outer layer thickness is controlled at 0.05-2mm; Finally by this ceramic core at 1300 ℃ of-1550 ℃ of sintering 20-120 minute, furnace cooling;
In technique of the present invention, after ceramic core sintering, ceramic core is immersed in heat-reactive phenolic resin or in urea, take out at air drying.
Beneficial effect of the present invention is: the composite ceramic core that adopts preparation method of the present invention to prepare, the higher-strength under the hot environment of 1500-1580 ℃ with 12-25MPa, higher non-deformability (amount of deflection is 0.5-1.8mm), ceramic core has the density that 34-37% is suitable simultaneously, is beneficial to removing of ceramic core.
Accompanying drawing explanation
Fig. 1 is the outside drawing of the composite ceramic core of the preferred embodiment of the present invention one preparation.
Fig. 2 is the outside drawing of the composite ceramic core of the preferred embodiment of the present invention two preparations.
Embodiment
Embodiment mono-
By melted paraffin wax and add 1% polyethylene, constantly stir, be warming up to 130 ℃, until polyethylene is dissolved in paraffin completely, add gradually hot powder, the mass ratio of powder and softening agent is 85: 15, powder is thick silica powder and fine quartz powder, and the quality proportioning of the two is 30: 70, and limit adds ceramic powder limit to stir, stir the tensio-active agent oleic acid that simultaneously also will add total mass 1.0%, churning time 6 hours; After softening agent, powder, tensio-active agent mix, temperature remains between 120 ℃.Adopt injection press ceramic core, forming pressure is 0.4MPa, and be 20 seconds inject time, and the dwell time is 60 seconds; Ceramic core is packed in filler, and filler adopts aluminium sesquioxide powder, and granularity is the industrial oxidation aluminium powder of 200 order; The ceramic core dewaxing stage adopts the low temperature sintering that slowly heats up, and heat-up rate is 5 ℃/min, while rising to 500 ℃, is incubated 1 hour; Burn 1150 ℃ of temperature, 4 hours time eventually.Preparation alumina slurry, slip consist of aluminum oxide powder and aluminium sol solution composition, powder liquid mass ratio is 1: 1, the particle diameter of aluminum oxide powder is 200nm, in colloidal sol, size of particles is 10nm; Internal layer ceramic core is soaked in alumina slurry 20 minutes under 0.01MPa condition, then take out ceramic core and be dried 4 hours under 24 ℃ of relative humidity 70% conditions, repeat this technological process 4 times, then by this ceramic core at 1450 ℃ of sintering 20 minutes, furnace cooling; Finally, ceramic core is immersed in heat-reactive phenolic resin or in urea, take out at air drying.
Fig. 1 is shown in by the ceramic core of preparation, and the composite ceramic core of the embodiment of the present invention one preparation has typical ectonexine structure as can be seen from Figure 1; Have good over-all properties, 1500 ℃ of high-temperature bending strengths can reach 15MPa after testing simultaneously, and deflection value can reach 0.8mm; And its 1500 ℃ of high-temperature bending strengths of ceramic core that adopt silica-based preparation in traditional preparation technology only reach 7MPa, deflection value has reached 1.8mm.
Embodiment bis-
By melted paraffin wax and add 1% polyethylene, constantly stir, be warming up to 130 ℃, until polyethylene is dissolved in paraffin completely, add gradually hot powder, the mass ratio of powder and softening agent is 85: 15, powder is thick silica powder and fine quartz powder, and the quality proportioning of the two is 30: 70, and limit adds ceramic powder limit to stir, stir the tensio-active agent oleic acid that simultaneously also will add total mass 1.0%, churning time 6 hours; After softening agent, powder, tensio-active agent mix, temperature remains between 120 ℃.Adopt injection press ceramic core, forming pressure is 0.4MPa, and be 20 seconds inject time, and the dwell time is 60 seconds; Ceramic core is packed in filler, and filler adopts aluminium sesquioxide powder, and granularity is the industrial oxidation aluminium powder of 200 order; The ceramic core dewaxing stage adopts the low temperature sintering that slowly heats up, and heat-up rate is 5 ℃/min, while rising to 500 ℃, is incubated 1 hour; Burn 1150 ℃ of temperature, 4 hours time eventually.Preparation Zirconia Slurry, slip consist of zirconia powder and zirconium sol solution composition, powder liquid mass ratio is 1: 1, the particle diameter of zirconia powder is 200nm, in colloidal sol, size of particles is 10nm; Internal layer ceramic core is soaked in Zirconia Slurry 20 minutes under 0.01MPa condition, then take out ceramic core and be dried 4 hours under 24 ℃ of relative humidity 70% conditions, repeat this technological process 4 times, then by this ceramic core at 1390 ℃ of sintering 40 minutes, furnace cooling; Finally, ceramic core is immersed in heat-reactive phenolic resin or in urea, take out at air drying.
Fig. 2 is the outside drawing of the composite ceramic core of the preferred embodiment of the present invention two preparations, as can be seen from the figure composite ceramic core has typical ectonexine structure, have good over-all properties, 1550 ℃ of high-temperature bending strengths can reach 12MPa, and deflection value can reach 1.2mm; And its 1550 ℃ of high-temperature bending strengths of ceramic core that adopt silica-based preparation in traditional preparation technology only reach 3MPa, deflection value has reached 3.2mm.
Embodiment tri-
By melted paraffin wax and add 1% polyethylene, constantly stir, be warming up to 130 ℃, until polyethylene is dissolved in paraffin completely, add gradually hot powder, the mass ratio of powder and softening agent is 85: 15, powder is thick silica powder and fine quartz powder, and the quality proportioning of the two is 30: 70, and limit adds ceramic powder limit to stir, stir the tensio-active agent oleic acid that simultaneously also will add total mass 1.0%, churning time 6 hours; After softening agent, powder, tensio-active agent mix, temperature remains between 120 ℃.Adopt injection press ceramic core, forming pressure is 0.4MPa, and be 20 seconds inject time, and the dwell time is 60 seconds; Ceramic core is packed in filler, and filler adopts aluminium sesquioxide powder, and granularity is the industrial oxidation aluminium powder of 200 order; The ceramic core dewaxing stage adopts the low temperature sintering that slowly heats up, and heat-up rate is 5 ℃/min, while rising to 500 ℃, is incubated 1 hour; Burn 1150 ℃ of temperature, 4 hours time eventually.Preparation yttrium oxide slip, slip consist of yttrium oxide powder and yttrium sol solution composition, powder liquid mass ratio is 1: 1, the particle diameter of yttrium oxide powder is 200nm, in colloidal sol, size of particles is 10nm; Internal layer ceramic core is soaked in yttrium oxide slip 20 minutes under 0.01MPa condition, then take out ceramic core and be dried 4 hours under 24 ℃ of relative humidity 70% conditions, repeat this technological process 5 times, then by this ceramic core at 1400 ℃ of sintering 30 minutes, furnace cooling; Finally, ceramic core is immersed in heat-reactive phenolic resin or in urea, take out at air drying.
The composite ceramic core of embodiment tri-preparations has typical ectonexine structure, has good over-all properties, and 1500 ℃ of high-temperature bending strengths can reach 18MPa, and deflection value can reach 0.9mm.And its 1500 ℃ of high-temperature bending strengths of ceramic core that adopt silica-based preparation only reach 7MPa, deflection value has reached 1.8mm.
In sum, the composite ceramic core that adopts preparation method of the present invention to prepare, the higher-strength under the hot environment of 1500-1580 ℃ with 12-25MPa, higher non-deformability (amount of deflection is 0.5-1.8mm), ceramic core has the density that 34-37% is suitable simultaneously, be beneficial to removing of ceramic core, met the needs that high efficiency cooling is prepared aircraft engine turbine blade.
The foregoing is only preferred embodiment of the present invention, not in order to limit application range of the present invention; All other do not depart from the equivalence completing under disclosed essence and change or modify, and all should be included within the scope of following claims.
Claims (4)
1. a composite ceramic core preparation method, the internal layer of described composite ceramic core is silica-based materials, skin is alumina base or yttria-base or zirconia-based material; It is characterized in that: described composite ceramic core preparation method comprises the steps:
(1) prepare softening agent: polyethylene will be added after melted paraffin wax, constantly stir, be warming up to 120 ℃-160 ℃, until polyethylene is dissolved in paraffin completely, after stirring, filter;
(2) prepare silica slurry: by described softening agent fusing, add gradually the hot powder of silicon-dioxide, stir while adding, stir the tensio-active agent that simultaneously adds 0.5%-1.0%, churning time 2-8 hour, described tensio-active agent is oleic acid or other aliphatic alcohols materials;
(3) internal layer ceramic core moulding: described silica slurry temperature is controlled to 100-140 ℃, adopts injection molding to carry out moulding;
(4) roasting (removing softening agent): internal layer ceramic core is packed in aluminum oxide powder filler and carries out roasting, and burning temperature is eventually 1150-1190 ℃, time 3-5 hour;
(5) the outer slip of preparation ceramic core: be preparation aluminum oxide or yttrium oxide or Zirconia Slurry, be combined as aluminum oxide powder and aluminium colloidal sol or yttrium oxide and the yttrium oxide colloidal sol or zirconium white and zirconium colloidal sol of slip form, powder liquid mass ratio is (1-2): 1, the particle diameter of powder is 100nm-1000nm, and in colloidal sol, size of particles is 5-20nm;
(6) soak, be dried: under 0.01-0.05MPa condition of negative pressure, internal layer ceramic core is immersed in to 2-6 hour in outer slip, then at air drying, need under 22-24 ℃ of relative humidity 50%-70% condition, be dried 4-12 hour, then ceramic core soaked again and be dried again, repeat this process 2-5 time, outer layer thickness is controlled at 0.05-2mm;
(7) sintering: dried ceramic core is carried out to sintering again, and burning temperature is eventually 1350-1550 ℃, and time 20-60 minute, finally makes composite ceramic core.
2. composite ceramic core preparation method according to claim 1, is characterized in that: the Quality of Paraffin Waxes per-cent in described step 1 softening agent is 80-95%, and polyethylene mass percent is 2-5%, and all the other are beeswax or stearic acid.
3. composite ceramic core preparation method according to claim 1 and 2, is characterized in that: described injection molding forming pressure is 0.4-0.8MPa, and be 20-120 second inject time, and the dwell time is 20-120 second.
4. composite ceramic core preparation method according to claim 1, it is characterized in that: in described roasting (removing softening agent) step, pack described internal layer ceramic core into aluminium sesquioxide powder, granularity is to carry out roasting in the industrial oxidation aluminium powder of 100-300 order, burning temperature is eventually 1150-1190 ℃, time 3-5 hour.
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| CN103693976A (en) * | 2013-12-09 | 2014-04-02 | 中国航空工业集团公司北京航空材料研究院 | Method for preparing silicon oxide-based ceramic core for titanium and titanium alloy casting |
| CN105272181A (en) * | 2015-10-16 | 2016-01-27 | 沈阳工业大学 | Preparation technology of composite ceramic core |
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| CN114180945A (en) * | 2021-12-29 | 2022-03-15 | 华中科技大学 | Additive manufacturing method for ceramic core-type shell integrated piece |
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| CN1807344A (en) * | 2006-02-09 | 2006-07-26 | 沈阳黎明航空发动机(集团)有限责任公司 | Hollow cast ceramic core and its preparation method |
| CN102266906A (en) * | 2010-06-02 | 2011-12-07 | 中国科学院金属研究所 | Preparation method of easy-to-remove ceramic mold core |
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