CN105314987B - A kind of sintering process of ceramic core - Google Patents
A kind of sintering process of ceramic core Download PDFInfo
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- CN105314987B CN105314987B CN201410226578.9A CN201410226578A CN105314987B CN 105314987 B CN105314987 B CN 105314987B CN 201410226578 A CN201410226578 A CN 201410226578A CN 105314987 B CN105314987 B CN 105314987B
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Abstract
It is an object of the invention on the basis of ceramic core structure is not changed, there is provided a kind of new sintering process, so as to improve the qualification rate of ceramic core sintering, it is characterised in that：When carrying out ceramic core sintering, with the increasing or decreasing of core section thickness size, the corresponding increasing or decreasing of sintering temperature in the same level of ceramic core different parts, so that the different parts of ceramic core keep synchronous sintering shrinkage substantially, reduce caused stress in ceramic core sintering process and then avoid the generation of phenomenon of rupture, improve the qualification rate of ceramic core.
Description
Technical field
The invention belongs to precision casting technology field, especially provides a kind of technology of preparing of ceramic core.
Background technology
Turbo blade is the hot-end component of aero-engine most critical.In order to improve the thermal efficiency, turbo blade advance temperature
Spend more and more higher.Improving the operating temperature of turbo blade mainly has two kinds of approach, that is, improves the thermostrength of alloy and using leaf
Piece cooling technology.Although the temperature capability of high-temperature alloy material has had large increase, at present close to the limit, it is necessary to tie
The requirement of modern Aviation industry can just be fully met by closing gas cooling technology.The height of gas cooling effect and the internal junction of blade
Structure has substantial connection, and in order to pursue higher gas cooling effect, the hollow-core construction of blade also becomes increasingly complex.
Prepared by turbo blade generally use casting method, hollow-core construction generally use ceramic core is formed.Blade is empty
Core structure is more complicated, then forms that the structure of the ceramic core of the structure is also more complicated, and size difference is also bigger.Typically, blade
Leading edge portion is thick big, usually ten a few to tens of millimeters, and trailing edge part is very thin, and thickness is typically less than 1 millimeter.Therefore, it is ceramic
Core general structure has size gradient characteristic.Complexity and larger-size otherness due to structure, ceramic core are burning
It is very easy to be broken at very thin place during knot, this causes the production qualification rate of ceramic core to be greatly lowered, and production cost is also big
It is big to improve.Therefore, how to solve to be broken at microsize in ceramic core so as to improve blade yield rate is to be badly in need of solution in production
Certainly the problem of.
The content of the invention
It is an object of the invention on the basis of ceramic core structure is not changed, there is provided a kind of new sintering process, from
And improve the qualification rate of ceramic core sintering.
The present invention specifically provides a kind of sintering process of ceramic core, it is characterised in that：Carrying out ceramic core sintering
When, with the increasing or decreasing of core section thickness size, the sintering temperature in the same level of ceramic core different parts
Corresponding increasing or decreasing.
The present invention inventive principle be：Using with the corresponding thermograde of ceramic core sectional dimension increasing or decreasing change
The sintering process sintering ceramic mold core of increasing or decreasing change, in the case where not changing sintering process, makes ceramic core not
Keep synchronous sintering shrinkage substantially with position, reduce caused stress in ceramic core sintering process and then avoid phenomenon of rupture
Generation, improve the qualification rate of ceramic core.
In sintering process of the present invention, putting position of the ceramic core in saggar is：By thickness gradient change and temperature
Put in the consistent direction of degree graded.
In sintering process of the present invention, ceramic core section thickness change in size scope is 0.3-3mm/cm, sintering temperature
Degree gradient scope is that (in sintering process of the present invention, the thermograde in sintering furnace is longitudinal temperature gradient to 0.3-1 DEG C/cm
Or Transverse Temperature Gradient).
In sintering process of the present invention, core section thickness change in size numerical value is corresponding with thermograde change numerical value
Relation is：Thickness changing value：Thermograde changing value=1-10mm/ DEG C.
In sintering process of the present invention, ceramic core is molded using injection molding mode, briquetting pressure 4-8MPa,
Injection time is the 20-120 seconds, and the dwell time is the 20-120 seconds.
In sintering process of the present invention, the ceramic core is silica base ceramic core or alumina-based ceramic type
Core.
In sintering process of the present invention, the filler powder of ceramic core is one in alumina powder, zirconium English powder or silica flour
Kind, mesh number is 100-300 mesh.
In sintering process of the present invention, the sintering schedule of ceramic core is：Silica base ceramic core be 1150 DEG C-
1250 DEG C/4-10h, alumina based ceramic core is 1250 DEG C -1450 DEG C/4-10h, cools to room temperature with the furnace.
In sintering process of the present invention, the ceramic core after sintering need to carry out room temperature reinforcing, ceramic core be immersed low
In medium-temperature reinforced dose (being preferably thermosetting phenolic resin or urea), 30-60 minutes are soaked, are dried in atmosphere after taking-up.
Embodiment
Embodiment 1
Ceramic core material is silica base material matter, and core section thickness size gradient is 0.3mm/cm；Ceramic core
It is molded using injection molding, briquetting pressure 4MPa, injection time is 20 seconds, and the dwell time is 20 seconds；Ceramic core exists
Putting position in saggar is：Change consistent direction with thermograde by thickness gradient change longitudinally to put (i.e. as core is cut
Face thickness is incremented by, and sintering temperature is gradually incremented by)；The filler powder of ceramic core is alumina powder, the mesh of powder particles 150；Sintering
Thermograde in stove is longitudinal temperature gradient, and temperature gradient is 0.3 DEG C/cm；The sintering schedule of ceramic core is：1180
DEG C/4h (temperature at sintering temperature finger-type core section thickness minimum, following examples use identical expression way),
Cool to room temperature with the furnace, the sintering finished rate of core is more than 85%；Ceramic core after sintering need to carry out room temperature reinforcing, will make pottery
Porcelain core is immersed in low-temperature reinforcement agent thermosetting phenolic resin, soak time 30 minutes, is then taken out and is dried in atmosphere, is made
Ceramic core.
Embodiment 2
Ceramic core material is silica base material matter, and core section thickness size gradient is 0.4mm/cm；Ceramic core
It is molded using injection molding, briquetting pressure 6MPa, injection time is 30 seconds, and the dwell time is 20 seconds；Ceramic core exists
Putting position in saggar is：Change consistent direction with thermograde by thickness gradient change longitudinally to put；Ceramic core is filled out
Feed powder is alumina powder, the mesh of powder particles 150；Thermograde in sintering furnace is longitudinal temperature gradient, and temperature gradient is
0.4℃/cm；The sintering schedule of ceramic core is：1200 DEG C/6h, cool to room temperature with the furnace, the sintering finished rate of core is 90%
More than；Ceramic core after sintering need to carry out room temperature reinforcing, ceramic core be immersed in low-temperature reinforcement agent urea, soak time 30
Minute, then take out and dry in atmosphere, ceramic core is made.
Embodiment 3
Ceramic core material is oxidation aluminium material, and core section thickness size gradient is 0.8mm/cm；Ceramic core uses
Injection molding is molded, briquetting pressure 6MPa, and injection time is 30 seconds, and the dwell time is 20 seconds；Ceramic core is in saggar
In putting position be：Change consistent direction with thermograde by thickness gradient change longitudinally to put；The filler powder of ceramic core
For alumina powder, the mesh of powder particles 150；Thermograde in sintering furnace is longitudinal temperature gradient, temperature gradient 0.5
℃/cm；The sintering schedule of ceramic core is：1350 DEG C/6h, cool to room temperature with the furnace, the sintering finished rate of core 85% with
On；Ceramic core after sintering need to carry out room temperature reinforcing, and ceramic core is immersed in low-temperature reinforcement agent thermosetting phenolic resin, leaching
30 minutes time is steeped, then takes out and dries in atmosphere.
Embodiment 4
Ceramic core material is oxidation aluminium material, and core section thickness size gradient is 2mm/cm；Ceramic core is using note
Molding mode shaping, briquetting pressure 6MPa are penetrated, injection time is 30 seconds, and the dwell time is 20 seconds；Ceramic core is in saggar
Putting position be：Change consistent direction with thermograde by thickness gradient change longitudinally to put；The filler powder of ceramic core is
Alumina powder, the mesh of powder particles 150；Thermograde in sintering furnace is longitudinal temperature gradient, and temperature gradient is 1 DEG C/cm；
The sintering schedule of ceramic core is：1400 DEG C/6h, cool to room temperature with the furnace, the sintering finished rate of core is more than 90%；Sintering
Ceramic core afterwards need to carry out room temperature reinforcing, ceramic core be immersed in low-temperature reinforcement agent thermosetting phenolic resin, soak time
30 minutes, then take out and dry in atmosphere.
Embodiment 5
Ceramic core material is silica base material matter, and core section thickness graded is 3mm/cm；Ceramic core is adopted
It is molded with injection molding, briquetting pressure 6MPa, injection time is 60 seconds, and the dwell time is 30 seconds；Ceramic core is in casket
Putting position in alms bowl is：Change consistent direction with thermograde by thickness gradient change longitudinally to put；The filler of ceramic core
Powder is alumina powder, the mesh of powder particles 100；Thermograde in sintering furnace is longitudinal temperature gradient, temperature gradient 1
℃/cm；The sintering schedule of ceramic core is：1250 DEG C/4h, cool to room temperature with the furnace, the sintering finished rate of core 90% with
On；Ceramic core after sintering need to carry out room temperature reinforcing, ceramic core be immersed in low-temperature reinforcement agent urea, soak time 30 is divided
Clock, then take out and dry in atmosphere.
Embodiment 6
Ceramic core material is silica base material matter, and core section thickness graded is 2mm/cm；Ceramic core is adopted
It is molded with injection molding, briquetting pressure 6MPa, injection time is 60 seconds, and the dwell time is 30 seconds；Ceramic core is in casket
Putting position in alms bowl is：Change consistent direction with thermograde by thickness gradient change longitudinally to put；The filler of ceramic core
Powder is alumina powder, the mesh of powder particles 100；Thermograde in sintering furnace is longitudinal temperature gradient, temperature gradient 0.5
℃/cm；The sintering schedule of ceramic core is：1250 DEG C/4h, cool to room temperature with the furnace, the sintering finished rate of core 90% with
On；Ceramic core after sintering need to carry out room temperature reinforcing, ceramic core be immersed in low-temperature reinforcement agent urea, soak time 30 is divided
Clock, then take out and dry in atmosphere.
Embodiment 7
Ceramic core material is oxidation aluminium material, and core section thickness size gradient is 3mm/cm；Ceramic core is using note
Molding mode shaping, briquetting pressure 6MPa are penetrated, injection time is 30 seconds, and the dwell time is 20 seconds；Ceramic core is in saggar
Putting position be：Change consistent direction with thermograde by thickness gradient change longitudinally to put；The filler powder of ceramic core is
Alumina powder, the mesh of powder particles 150；Thermograde in sintering furnace is longitudinal temperature gradient, temperature gradient is 0.3 DEG C/
cm；The sintering schedule of ceramic core is：1400 DEG C/6h, cool to room temperature with the furnace, the sintering finished rate of core is more than 90%；
Ceramic core after sintering need to carry out room temperature reinforcing, and ceramic core is immersed in low-temperature reinforcement agent thermosetting phenolic resin, immersion
30 minutes time, then take out and dry in atmosphere.
Comparative example
It is not to be sintered using thermograde with the difference of embodiment 1, the sintering finished rate of core exists
60% or so.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar can understand present disclosure and implement according to this, and it is not intended to limit the scope of the present invention.It is all according to the present invention
The equivalent change or modification that Spirit Essence is made, it should all be included within the scope of the present invention.
Claims (9)
- A kind of 1. sintering process of ceramic core, it is characterised in that：When carrying out ceramic core sintering, with core section thickness The increasing or decreasing of size, the corresponding increasing or decreasing of sintering temperature in the same level of ceramic core different parts；Ceramics Core section thickness change in size scope is 0.3-3mm/cm, and sintering temperature gradient scope is 0.3-1 DEG C/cm.
- 2. according to the sintering process of ceramic core described in claim 1, it is characterised in that ceramic core puts position in saggar It is set to：Change consistent direction with thermograde by thickness gradient change to put.
- 3. according to the sintering process of any ceramic core of claim 1~2, it is characterised in that core section thickness size The corresponding relation that change numerical value and thermograde change numerical value is：Thickness changing value：Thermograde changing value=1-10mm/ ℃。
- 4. according to the sintering process of ceramic core described in claim 3, it is characterised in that：Ceramic core uses injection molding side Formula is molded, and briquetting pressure 4-8MPa, injection time is the 20-120 seconds, and the dwell time is the 20-120 seconds.
- 5. according to the sintering process of ceramic core described in claim 3, it is characterised in that：Ceramic core is titanium dioxide silicon based ceramic Core or alumina based ceramic core.
- 6. according to the sintering process of ceramic core described in claim 5, it is characterised in that：The filler powder of ceramic core is aluminum oxide One kind in powder, zirconium English powder or silica flour, mesh number are 100-300 mesh.
- 7. according to the sintering process of ceramic core described in claim 5, it is characterised in that the sintering schedule of ceramic core is：Two Oxidation silicon-base ceramic core is 1150 DEG C -1250 DEG C/4-10h, and alumina based ceramic core is 1250 DEG C -1450 DEG C/4-10h, Cool to room temperature with the furnace.
- 8. according to claim 1~2, the sintering process of 4~7 any ceramic cores, it is characterised in that：Ceramics after sintering Core need to carry out room temperature reinforcing, and ceramic core is immersed in low-temperature reinforcement agent, soak 30-60 minutes, done in atmosphere after taking-up It is dry.
- 9. according to the sintering process of ceramic core described in claim 8, it is characterised in that：The low-temperature reinforcement agent is thermosetting phenol Urea formaldehyde or urea.
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| CN105314987B true CN105314987B (en) | 2018-02-23 |
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| CN107473751B (en) * | 2017-07-27 | 2019-10-25 | 佛山市非特新材料有限公司 | A kind of production method of two-part sintering ceramic mold core |
| CN107824741B (en) * | 2017-11-10 | 2019-07-02 | 沈阳明禾石英制品有限责任公司 | A kind of ceramic core sintering composite filling and its application method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101403423A (en) * | 2008-11-11 | 2009-04-08 | 信义集团公司 | Method for producing metal brake block by segmented ablation and secondary grinding |
| CN102632200A (en) * | 2012-04-28 | 2012-08-15 | 沈阳工业大学 | Ceramic mold core cracking prevention process method for combustion engine blades |
| CN103468919A (en) * | 2013-08-12 | 2013-12-25 | 舞阳钢铁有限责任公司 | Method for reducing roll marks on surface of steel plate in quenching furnace |
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- 2014-05-26 CN CN201410226578.9A patent/CN105314987B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101403423A (en) * | 2008-11-11 | 2009-04-08 | 信义集团公司 | Method for producing metal brake block by segmented ablation and secondary grinding |
| CN102632200A (en) * | 2012-04-28 | 2012-08-15 | 沈阳工业大学 | Ceramic mold core cracking prevention process method for combustion engine blades |
| CN103468919A (en) * | 2013-08-12 | 2013-12-25 | 舞阳钢铁有限责任公司 | Method for reducing roll marks on surface of steel plate in quenching furnace |
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