CN109574661A - A kind of preparation method and application of barium zirconate ceramic core - Google Patents
A kind of preparation method and application of barium zirconate ceramic core Download PDFInfo
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- CN109574661A CN109574661A CN201811524988.6A CN201811524988A CN109574661A CN 109574661 A CN109574661 A CN 109574661A CN 201811524988 A CN201811524988 A CN 201811524988A CN 109574661 A CN109574661 A CN 109574661A
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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
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/48—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on zirconium or hafnium oxides, zirconates, zircon or hafnates
- C04B35/486—Fine ceramics
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
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- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
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- 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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- B22C9/00—Moulds or cores; Moulding processes
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Abstract
The present invention relates to ceramic core technical field more particularly to a kind of preparation method and application of barium zirconate ceramic core.Preparation method provided by the invention, comprising the following steps: barium zirconate, beeswax and paraffin are mixed, barium zirconate ceramic stone wax liquor material is obtained；By the barium zirconate ceramic stone wax liquor material die cast, barium zirconate ceramic core biscuit is obtained；By the barium zirconate ceramic core biscuit powder embedded sintering, barium zirconate ceramic core is obtained.The barium zirconate ceramic core room temperature intensity with higher and high-temperature stability that preparation method provided by the invention is prepared, sintering front and back dimensional stability with higher, use suitable for high-temperature casting Nb-Si based alloy turbo blade, kickback will not occur with the chemical element in Nb-Si based alloy, the inner cavity quality of Nb-Si alloy hollow blade has been effectively ensured.
Description
Technical field
The present invention relates to ceramic core technical field more particularly to a kind of preparation method of barium zirconate ceramic core and answer
With.
Background technique
In recent years, due to Nb-Si based alloy room temperature intensity with higher, at room temperature with certain toughness, Gao Rong
The characteristics such as point and low-density, are expected to as one of the important materials for researching and developing high thrust ratio aero engine turbine blades material.But
Nb-Si based alloy is limited by alloy fusing point itself, and the air cooling structure by improving turbo blade is needed to hold temperature to improve it
Ability and cooling efficiency in use.
And the key technology of turbo blade first is that preparing high performance ceramic core component.Ceramic core is mainly used to
The inner cavity of turbo blade is formed, the superiority and inferiority of performance will affect the quality of hollow blade.Therefore, how high performance by preparing
Ceramic core becomes people's urgent problem to be solved to improve the inner cavity quality of Nb-Si based alloy turbo blade.
Summary of the invention
The purpose of the present invention is to provide a kind of high-performance of inner cavity quality that Nb-Si based alloy turbo blade can be improved
Ceramic core.
In order to achieve the above-mentioned object of the invention, the present invention the following technical schemes are provided:
The present invention provides a kind of preparation methods of barium zirconate ceramic core, comprising the following steps:
Barium zirconate, beeswax and paraffin are mixed, barium zirconate ceramic stone wax liquor material is obtained；
By the barium zirconate ceramic stone wax liquor material die cast, barium zirconate ceramic core biscuit is obtained；
By the barium zirconate ceramic core biscuit powder embedded sintering, barium zirconate ceramic core is obtained.
Preferably, the mass ratio of the barium zirconate, beeswax and paraffin is (85~92): (0.5~1.5): (8~10).
Preferably, the mixed temperature is 60~90 DEG C, and the mixed time is 6~10h.
Preferably, the pressure of the die cast is 5~20MPa, and the dwell time of the die cast is 50~100s.
Preferably, used buried powder filler is the calcined zirconic acid barium dust of industry during the powder embedded sintering.
Preferably, the temperature control program of the powder embedded sintering are as follows:
90 DEG C are warming up to the heating rate of 0.2~1 DEG C/min, 5~10h is kept the temperature, with the heating rate of 1~2 DEG C/min
600 DEG C are warming up to, 5~10h is kept the temperature, is warming up to the heating rate of 2~5 DEG C/min and burns 1500~1700 DEG C of temperature eventually, heat preservation 4
~12h.
Preferably, the barium zirconate is obtained by thick barium zirconate crystal grain and thin barium zirconate crystal grain mixing and ball milling；
The partial size of the thick barium zirconate crystal grain is 325~600 mesh；The partial size of the thin barium zirconate crystal grain is 100~200
Mesh.
Preferably, the mass ratio of the thick barium zirconate crystal grain and thin barium zirconate crystal grain is 1:(1~4).
The present invention also provides the barium zirconate ceramic cores that the preparation method is prepared to prepare Nb-Si based alloy
Application in turbo blade.
The present invention provides a kind of preparation methods of barium zirconate ceramic core, comprising the following steps: by barium zirconate, beeswax and
Paraffin mixing, obtains barium zirconate ceramic stone wax liquor material；By the barium zirconate ceramic stone wax liquor material die cast, barium zirconate pottery is obtained
Porcelain type core biscuit；By the barium zirconate ceramic core biscuit powder embedded sintering, barium zirconate ceramic core is obtained.System provided by the invention
Barium zirconate ceramic core room temperature intensity with higher and high-temperature stability that Preparation Method is prepared (including amount of deflection, refractoriness
And creep resistance), sintering front and back dimensional stability with higher, suitable for high-temperature casting Nb-Si based alloy turbo blade
It uses, and stability at elevated temperature is good, kickback will not occur with the chemical element in Nb-Si based alloy, be effectively ensured
The inner cavity quality of Nb-Si alloy hollow blade, and the porosity with higher (> 30%), can be effectively ensured corrosive liquid and enter type
Core inner is removed.
Specific embodiment
The present invention provides a kind of preparation methods of barium zirconate ceramic core, comprising the following steps:
Barium zirconate, beeswax and paraffin are mixed, barium zirconate ceramic stone wax liquor material is obtained；
By the barium zirconate ceramic stone wax liquor material die cast, barium zirconate ceramic core biscuit is obtained；
By the barium zirconate ceramic core biscuit powder embedded sintering, barium zirconate ceramic core is obtained.
In the present invention, if without specified otherwise, the raw material components are commercial product well known to those skilled in the art.
The present invention mixes barium zirconate, beeswax and paraffin, obtains barium zirconate ceramic stone wax liquor material.In the present invention, described
Barium zirconate is preferably obtained by thick barium zirconate crystal grain and thin barium zirconate crystal grain mixing and ball milling；In the present invention, the thick barium zirconate is brilliant
The partial size of body is preferably 325~600 mesh, more preferably 400~550 mesh, most preferably 450~500 mesh；The thin barium zirconate is brilliant
The partial size of body is preferably 100~200 mesh, more preferably 120~180 mesh, most preferably 140~160 mesh.
In the present invention, the mass ratio of the thick barium zirconate crystal grain and thin barium zirconate crystal grain is preferably 1:(1~4), it is more excellent
It is selected as 1:(1.5~3.5), most preferably 1:(2.0~3.0).
The present invention does not have any special restriction to the ball milling, using mechanical milling process well known to those skilled in the art into
Row ball milling, rotational speed of ball-mill 300rpm, Ball-milling Time are for 24 hours.
After the completion of ball milling, the present invention is preferably dried the material obtained after ball milling.In the present invention, the drying
Temperature is preferably 110~130 DEG C, and more preferably 115~125 DEG C, most preferably
118~122 DEG C；The time of the drying is preferably 20~30h, more preferably 22~28h, most preferably 24~
26h.In the present invention, the drying is preferably dried in vacuo；The present invention does not have any spy to the vacuum drying vacuum degree
Different restriction, using vacuum degree well known to those skilled in the art.
In the present invention, the mass ratio of the barium zirconate, beeswax and paraffin is preferably (85~92): (0.5~1.5): (8
~10), more preferably (86~90): (0.8~1.2): (8.5~9.5), most preferably (87~88): (0.9~1.1): (8.8
~9.2).
In the present invention, the mixing temperature of the barium zirconate, beeswax and paraffin is preferably 60~90 DEG C, more preferably 65~
85 DEG C, most preferably 70~80 DEG C.In the present invention, the incorporation time of the barium zirconate, beeswax and paraffin is preferably 6~10h,
More preferably 7~9h, most preferably 7.5~8.5h；The incorporation time of the barium zirconate, beeswax and paraffin is added with barium zirconate
It finishes and starts to count.
In the present invention, the mixing of the barium zirconate, beeswax and paraffin preferably carries out under stirring conditions；The stirring
Rate be preferably 30~50rpm, more preferable 35~45rpm, most preferably 38~42rpm.
In the present invention, beeswax and paraffin are preferably carried out the first mixing by the mixing of the barium zirconate, beeswax and paraffin,
Obtain mixture；The mixture is heated to melting, obtained molten mixture is then carried out second with barium zirconate and is mixed.
In the present invention, barium zirconate is preferably slowly added into the molten mixture by second mixing；It is described
The addition rate of barium zirconate is preferably 6~10wt%/h, more preferably 8~10wt%/h.In the present invention, the wt% is zirconium
The additional amount of sour barium accounts for the mass percent of molten mixture；Barium zirconate is slowly added into the molten mixture by the present invention
In, it can guarantee the high dispersion of barium zirconate ceramic powders and improve its solid concentration.
After obtaining barium zirconate ceramic stone wax liquor material, the present invention obtains the barium zirconate ceramic stone wax liquor material die cast
Barium zirconate ceramic core biscuit.In the present invention, after obtaining barium zirconate ceramic stone wax liquor material, before carrying out die cast, preferably will
Barium zirconate ceramic stone wax liquor material is kept stirring state within the scope of 80~90 DEG C；The temperature of the barium zirconate ceramic stone wax liquor material is more
Preferably 82~88 DEG C, most preferably 84~86 DEG C；The rate of the stirring is preferably 10~20rpm, more preferably 12~
18rpm, most preferably 14~16rpm.
In the present invention, barium zirconate ceramic stone wax liquor material is kept stirring state within the scope of 80~90 DEG C is to guarantee
The high dispersion of zirconic acid barium dust.
In the present invention, the pressure of the die cast is preferably 5~20MPa, more preferably 8~18MPa, most preferably
10~15MPa；The dwell time of the die cast is preferably 50~100s, more preferably 60~90s, most preferably 70~
80s。
After the completion of die cast, the present invention is preferably cooled down and is demoulded to obtained product, obtains barium zirconate ceramic mould
Core biscuit component.The present invention is to the mode of the cooling and demoulding, without any special restriction, using those skilled in the art
Well known cooling and knockout course carry out.
After obtaining barium zirconate ceramic core biscuit, the present invention obtains the barium zirconate ceramic core biscuit powder embedded sintering
Barium zirconate ceramic core.In the present invention, the filler of the powder embedded sintering is preferably the calcined zirconic acid barium dust of industry, zirconic acid
Titanate ceramics type core biscuit is preferably disposed in the center of aluminium oxide ceramics saggar；The powder embedded sintering preferably under air conditions into
Row pressureless sintering.
In the present invention, type core can be guaranteed as the filler of powder embedded sintering using the calcined zirconic acid barium dust of industry
Shape and size stability.
In the present invention, the powder embedded sintering is preferably warming up to 90 DEG C with the heating rate of 0.2~1 DEG C/min, and heat preservation 5~
10h；600 DEG C are warming up to the heating rate of 1~2 DEG C/min, keeps the temperature 5~10h；It is warming up to the heating rate of 2~5 DEG C/min
1500~1700 DEG C of temperature are burnt eventually, keep the temperature 4~12h；90 DEG C more preferably are warming up to the heating rate of 0.4~0.8 DEG C/min, is protected
6~9h of temperature；600 DEG C are warming up to the heating rate of 1.2~1.8 DEG C/min, keeps the temperature 6~9h；With the liter of 2.5~4.5 DEG C/min
Warm rate is warming up to burns 1550~1650 DEG C of temperature eventually, keeps the temperature 6~10h；Most preferably with the heating rate of 0.5~0.6 DEG C/min
90 DEG C are warming up to, 7~8h is kept the temperature；600 DEG C are warming up to the heating rate of 1.4~1.6 DEG C/min, keeps the temperature 7~8h；With 3~4
DEG C/heating rate of min is warming up to and burns 1580~1620 DEG C of temperature eventually, keep the temperature 7~9h.
After the completion of powder embedded sintering, the present invention further preferably includes cooling process；The cooling preferably cools to room with the furnace
Temperature.
The present invention also provides the barium zirconate ceramic cores that above-mentioned preparation method is prepared to prepare Nb-Si based alloy whirlpool
Application in impeller blade.
It is carried out below with reference to preparation method and application of the embodiment to barium zirconate ceramic core provided by the invention detailed
Illustrate, but they cannot be interpreted as limiting the scope of the present invention.
Embodiment 1
It is the fine grain mixing and ball milling of 1000 mesh by coarse grain and 400g partial size that 200g partial size is 325 mesh, in 120 DEG C of items
It is dried in vacuo under part for 24 hours, obtains barium zirconate；
The paraffin of the beeswax of 7g and 60g are mixed, 90 DEG C of fusings is warming up to, obtains the molten mixture of beeswax and paraffin；
In the case where revolving speed is the stirring condition of 50rpm, the barium zirconate of 600g is slowly added to the melting mixing of beeswax and paraffin
Continue to stir 10h in object, after addition, obtains barium zirconate ceramic stone wax liquor material；
The barium zirconate ceramic stone wax liquor material is continually maintained under conditions of 90 DEG C and is stirred with the rate of 10rpm, to protect
Slurry is held to be uniformly dispersed, in case die cast is used, the pressure of die cast is 20MPa, dwell time 50s, and cooling demoulds,
Obtain barium zirconate ceramic core biscuit；
Using the calcined zirconic acid barium dust of industry as buried powder filler, the barium zirconate ceramic core biscuit is placed in aluminium oxide
The center of ceramic saggar increases the temperature to 90 DEG C with the heating rate of 0.2 DEG C/min, keeps the temperature 10h in air atmosphere,
600 DEG C are warming up to the heating rate of 1 DEG C/min, keeps the temperature 5h, is warming up to the heating rate of 2 DEG C/min and burns temperature 1700 eventually
DEG C, 4h is kept the temperature, room temperature is cooled to the furnace, obtains barium zirconate ceramic core.
The room temperature intensity of the ceramic core reaches 30MPa, and 1500 DEG C of elevated temperature strength reaches 25MPa, with higher
High temperature dimensional stability is able to bear the erosion of Nb-Si aluminium alloy, and the Nb-Si alloy vane prepared has better quality
Inner cavity.
Embodiment 2
It is the fine grain mixing and ball milling of 2000 mesh by coarse grain and 400g partial size that 200g partial size is 500 mesh, in 120 DEG C of items
It is dried in vacuo under part for 24 hours, obtains barium zirconate；
The paraffin of the beeswax of 7g and 60g are mixed, 90 DEG C of fusings is warming up to, obtains the molten mixture of beeswax and paraffin；
In the case where revolving speed is the stirring condition of 50rpm, the zirconic acid barium dust of 600g is slowly added to the melting of beeswax and paraffin
Continue to stir 10h in mixture, after addition, obtains barium zirconate ceramic stone wax liquor material；
Continue to stir with the rate of 10rpm under conditions of the barium zirconate ceramic stone wax liquor material is continually maintained in 90 DEG C,
To keep slurry to be uniformly dispersed, in case die cast is used, the pressure of die cast is 20MPa, dwell time 50s, and cooling takes off
Mould obtains barium zirconate ceramic core biscuit；
Using the calcined zirconic acid barium dust of industry as buried powder filler, the barium zirconate ceramic core biscuit is placed in aluminium oxide
The center of ceramic saggar increases the temperature to 90 DEG C with the heating rate of 0.2 DEG C/min, keeps the temperature 10h in air atmosphere,
600 DEG C are warming up to the heating rate of 2 DEG C/min, keeps the temperature 10h, is warming up to the heating rate of 5 DEG C/min and burns temperature 1700 eventually
DEG C, 12h is kept the temperature, room temperature is cooled to the furnace, obtains barium zirconate ceramic core；
The room temperature intensity of the ceramic core reaches 35MPa, and 1500 DEG C of elevated temperature strength reaches 28MPa, with higher
High temperature dimensional stability is able to bear the erosion of Nb-Si aluminium alloy, and the Nb-Si alloy vane prepared has better quality
Inner cavity.
Embodiment 3
It is the fine grain mixing and ball milling of 2000 mesh by coarse grain and 400g partial size that 200g partial size is 500 mesh, in 120 DEG C of items
It is dried in vacuo under part for 24 hours, obtains barium zirconate；
The paraffin of the beeswax of 7g and 60g are mixed, 90 DEG C of fusings is warming up to, obtains the molten mixture of beeswax and paraffin；
In the case where revolving speed is the stirring condition of 50rpm, the zirconic acid barium dust of 600g is slowly added to the melting of beeswax and paraffin
Continue to stir 10h in mixture, after addition, obtains barium zirconate ceramic stone wax liquor material；
Continue to stir with the rate of 20rpm under conditions of the barium zirconate ceramic stone wax liquor material is continually maintained in 90 DEG C,
To keep slurry to be uniformly dispersed, in case die cast is used, the pressure of die cast is 20MPa, dwell time 50s, and cooling takes off
Mould obtains barium zirconate ceramic core biscuit；
Using the calcined zirconic acid barium dust of industry as buried powder filler, the barium zirconate ceramic core biscuit is placed in aluminium oxide
The center of ceramic saggar increases the temperature to 90 DEG C with the heating rate of 0.2 DEG C/min, keeps the temperature 10h in air atmosphere,
600 DEG C are warming up to the heating rate of 2 DEG C/min, keeps the temperature 10h, is warming up to the heating rate of 5 DEG C/min and burns temperature 1600 eventually
DEG C, 12h is kept the temperature, room temperature is cooled to the furnace, obtains barium zirconate ceramic core；
The room temperature intensity of the ceramic core reaches 32MPa, and 1500 DEG C of elevated temperature strength reaches 28MPa, with higher
High temperature dimensional stability is able to bear the erosion of Nb-Si aluminium alloy, and the Nb-Si alloy vane prepared has better quality
Inner cavity.
Embodiment 4
It is the fine grain mixing and ball milling of 1500 mesh by coarse grain and 400g partial size that 200g partial size is 325 mesh, in 120 DEG C of items
It is dried in vacuo under part for 24 hours, obtains barium zirconate；
The paraffin of the beeswax of 7g and 60g are mixed, 90 DEG C of fusings is warming up to, obtains the molten mixture of beeswax and paraffin；
In the case where revolving speed is the stirring condition of 50rpm, the zirconic acid barium dust of 600g is slowly added to the melting of beeswax and paraffin
Continue to stir 10h in mixture, after addition, obtains barium zirconate ceramic stone wax liquor material；
Continue to stir with the rate of 20rpm under conditions of the barium zirconate ceramic stone wax liquor material is continually maintained in 90 DEG C,
To keep slurry to be uniformly dispersed, in case die cast is used, the pressure of die cast is 20MPa, dwell time 50s, and cooling takes off
Mould obtains barium zirconate ceramic core biscuit；
Using the calcined zirconic acid barium dust of industry as buried powder filler, the barium zirconate ceramic core biscuit is placed in aluminium oxide
The center of ceramic saggar increases the temperature to 90 DEG C with the heating rate of 0.2 DEG C/min, keeps the temperature 10h in air atmosphere,
600 DEG C are warming up to the heating rate of 2 DEG C/min, keeps the temperature 10h, is warming up to the heating rate of 5 DEG C/min and burns temperature 1500 eventually
DEG C, 12h is kept the temperature, room temperature is cooled to the furnace, obtains barium zirconate ceramic core；
The room temperature intensity of the ceramic core reaches 28MPa, and 1500 DEG C of elevated temperature strength reaches 26MPa, with higher
High temperature dimensional stability is able to bear the erosion of Nb-Si aluminium alloy, and the Nb-Si alloy vane prepared has better quality
Inner cavity.
Comparative example 1
Traditional alumina ceramic core:
It is the fine grain mixing and ball milling of 1500 mesh by coarse grain and 400g partial size that 200g partial size is 325 mesh, in 120 DEG C of items
It is dried in vacuo under part for 24 hours, obtains alumina material；
The paraffin of the beeswax of 7g and 60g are mixed, 90 DEG C of fusings is warming up to, obtains the molten mixture of beeswax and paraffin；
In the case where revolving speed is the stirring condition of 50rpm, the alumina powder of 600g is slowly added to the melting of beeswax and paraffin
Continue to stir 10h in mixture, after addition, obtains aluminium oxide ceramics paraffin slurry；
Continue to stir with the rate of 20rpm under conditions of the aluminium oxide ceramics paraffin slurry is continually maintained in 90 DEG C,
To keep slurry to be uniformly dispersed, in case die cast is used, the pressure of die cast is 20MPa, dwell time 50s, and cooling takes off
Mould obtains alumina ceramic core biscuit；
Using the calcined alumina powder of industry as buried powder filler, the alumina ceramic core biscuit is placed in aluminium oxide
The center of ceramic saggar increases the temperature to 90 DEG C with the heating rate of 0.2 DEG C/min, keeps the temperature 10h in air atmosphere,
600 DEG C are warming up to the heating rate of 2 DEG C/min, keeps the temperature 10h, is warming up to the heating rate of 5 DEG C/min and burns temperature 1500 eventually
DEG C, 12h is kept the temperature, room temperature is cooled to the furnace, obtains alumina ceramic core；
The room temperature intensity of the ceramic core is 25MPa, and 1500 DEG C of elevated temperature strength is only 10MPa, dimensional stability
It is lower than barium zirconate, it deforms under hot conditions, it is impossible to be used in preparation Nb-Si alloy vane, otherwise its inner-cavity structure is difficult to
Guarantee, and the preferable high temperature dimensional stability of barium zirconate ensure that the inner-cavity structure of Nb-Si alloy vane.
As seen from the above embodiment, Nb-Si based alloy whirlpool can be improved in barium zirconate ceramic core biscuit provided by the invention
The temperature capability of impeller blade and cooling efficiency in use.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (9)
1. a kind of preparation method of barium zirconate ceramic core, comprising the following steps:
Barium zirconate, beeswax and paraffin are mixed, barium zirconate ceramic stone wax liquor material is obtained；
By the barium zirconate ceramic stone wax liquor material die cast, barium zirconate ceramic core biscuit is obtained；
By the barium zirconate ceramic core biscuit powder embedded sintering, barium zirconate ceramic core is obtained.
2. preparation method as described in claim 1, which is characterized in that the mass ratio of the barium zirconate, beeswax and paraffin is (85
~92): (0.5~1.5): (8~10).
3. preparation method as described in claim 1, which is characterized in that the mixed temperature is 60~90 DEG C, the mixing
Time be 6~10h.
4. preparation method as described in claim 1, which is characterized in that the pressure of the die cast is 5~20MPa, described
The dwell time of die cast is 50~100s.
5. preparation method as described in claim 1, which is characterized in that buried powder filler used by during the powder embedded sintering
For the calcined zirconic acid barium dust of industry.
6. preparation method as described in claim 1, which is characterized in that the temperature control program of the powder embedded sintering are as follows:
90 DEG C are warming up to the heating rate of 0.2~1 DEG C/min, keeps the temperature 5~10h；It is heated up with the heating rate of 1~2 DEG C/min
To 600 DEG C, 5~10h is kept the temperature；With the heating rate of 2~5 DEG C/min be warming up to eventually burn 1500~1700 DEG C of temperature, heat preservation 4~
12h。
7. preparation method as described in claim 1, which is characterized in that the barium zirconate is by thick barium zirconate crystal grain and thin barium zirconate
Crystal grain mixing and ball milling obtains；
The partial size of the thick barium zirconate crystal grain is 325~600 mesh；The partial size of the thin barium zirconate crystal grain is 100~200 mesh.
8. preparation method as claimed in claim 7, which is characterized in that the matter of the thick barium zirconate crystal grain and thin barium zirconate crystal grain
Amount is than being 1:(1~4).
9. the barium zirconate ceramic core that preparation method according to any one of claims 1 to 8 is prepared is closed in preparation Nb-Si base
Application in golden turbo blade.
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