CN110156486A - The preparation method of high tenacity stratiform bullet-resistant ceramic material and the tape casting combination hot pressing sintering method - Google Patents
The preparation method of high tenacity stratiform bullet-resistant ceramic material and the tape casting combination hot pressing sintering method Download PDFInfo
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Abstract
The present invention relates to the preparation methods of a kind of high tenacity stratiform bullet-resistant ceramic material and the tape casting combination hot pressing sintering method, include the following steps: (1), ceramic sheet preparation: the curtain coating of slurry, drying, demoulding, cutting；(2), structure designs: the ceramic sheet of heterogeneity is carried out lamination according to certain Thickness ratio and sequence；(3), the preparation of biscuit of ceramics: certain pressure, at a temperature of be pressed；(4), the hot pressed sintering preparation of high tenacity stratiform bullet-resistant ceramic material.The present invention uses the high tenacity stratiform bullet-resistant ceramic material of the tape casting combination hot pressing sintering method preparation, utilize the crack deflection toughening at weak binding interface, the residual stress toughening mode of strong combination interface improves the damage tolerance of material, and the Impedance matching design in conjunction with layer structure substantially increases shock resistance；The structure designability of the tape casting combination hot pressing sintering method is used to provide possibility for the manufacture of various bulletproof armours simultaneously.
Description
Technical field
The invention belongs to the preparation method of ceramic composite, it is related to a kind of high tenacity stratiform bullet-resistant ceramic material and curtain coating
The preparation method more particularly to the tape casting and hot pressing sintering method of method combination hot pressing sintering method combine preparation high intensity, high tenacity
The method of stratiform bullet-resistant ceramic material.
Background technique
Boron carbide, silicon carbide, silicon nitride and titanium diboride ceramic have many advantages, such as that high rigidity, high temperature resistant, high-modulus are wide
It is general to apply in anti-high speed impact field, however low tenacity, make these materials pole under high speed impact to low antibody Monoclonal tolerance
Brittle fracture easily occurs, it is difficult to resist multiple shock resistance.Ceramic layered structure designability makes it possess high damage tolerance, height
Energy absorption ability.High tenacity is obtained while can be designed so that laminate ceramic keeps high-intensitive by structure, improves it
Impact resistance has the potentiality for resisting various impact stress.Ceramic layered at present there are mainly two types of toughening modes: one is logical
Introducing weak interface layer is crossed, so that crackle deflects in interface, the extensions path of crackle is increased, improves the energy-absorbing of material；
Another kind is that the toughness and energy absorption ability of material are improved by the residual stress of interlayer by introducing strong interface.Both modes
Stratiform can be met by the Impedance matching of different layers in the shock proof requirement in various fields.
The structured designability of ceramic layered tool prepared by the tape casting combination hot pressed sintering, by changing lamination layer
Numerical control preparative layer thickness rate；By selecting different interface system control interface bond strengths.The ceramic layered interface of preparation is clear, has
There are high-strength and high ductility, high energy-absorbing and excellent impact resistance.The patent document of Patent No. CN108467272A, which discloses, to be adopted
With gel injection-moulding method, alternately casting base layer and separate layer are ceramic in a mold, then pass through hot pressed sintering again and prepare stratiform pottery
Porcelain.But since the process cycle by gel injection-moulding method is long, low efficiency, interfacial thickness poor controllability, biscuit dumping cracking, layering
The problems such as limitation so that its structure designability is poor, prepared ceramic layered type is limited.It is prepared ceramic layered tough
Property, intensity, shock resistance promoted less, be not suitable for industrialized production.
Summary of the invention
Technical problems to be solved
In order to avoid the shortcomings of the prior art, the present invention proposes a kind of high tenacity stratiform bullet-resistant ceramic material and curtain coating
The preparation method of method combination hot pressing sintering method is a kind of the tape casting combination hot pressing sintering method preparation high tenacity stratiform bulletproof ceramic material
The method of material and the ceramic layered application in shock resistance field.
Technical solution
A kind of high tenacity stratiform bullet-resistant ceramic material, it is characterised in that including the ceramic membrane that multilayer overlaps, multilayer is overlapping
When thick-layer be conforming layer structure or gradient layer structure, and thick-layer and thin layer cannot be ceramic membrane material of the same race when lamination；It is described
The thickness of thick-layer are as follows: 0.15~0.5mm；The thickness of thin layer of monolithic is 0.05~0.1mm；The ceramic membrane is SiC or B4C or
Si3N4Or TiB2Or the ceramic membrane of BN or graphite or WC material, wherein BN or graphite or WC material are only capable of using as thin layer,
SiC or B4C or Si3N4Or TiB2It can be thin layer also can be thick-layer.
When the stratified material of BN or graphite as thin layer, Thickness ratio is in 20:1~60:1.
As SiC or B4C or TiB2Or Si3N4Or stratified material of the WC as thin layer, thickness rate is in 3:1~20:1.
A kind of method that the tape casting combination hot pressing sintering method prepares the high tenacity stratiform bullet-resistant ceramic material, feature exist
In steps are as follows:
Step 1, ceramic sheet preparation: preparing ceramic membrane using the tape casting, dry ceramic casting belt is cut,
Demoulding；The ceramic sheet uses SiC or B according to the structure design of material4C or Si3N4Or TiB2Or BN or graphite or WC；Institute
The thickness for stating ceramic sheet is designed according to the structure of material are as follows: the thickness of thick-layer are as follows: 0.15~0.5mm；The thickness of thin layer of monolithic
For 0.05~0.1mm；
Step 2: being designed according to the structure of material, multi-layer ceramics film is mutually overlapped and forms conforming layer structure or gradient layer
Structure carries out alternately lamination according to different Thickness ratios and obtains having the ceramic layered prefabricated of conforming layer structure or gradient layer structure
Body；
Wherein BN or graphite or WC material are only capable of using as thin layer, SiC or B4C or Si3N4Or TiB2It can be thin layer
It can be thick-layer；
When the stratified material of BN or graphite as thin layer, Thickness ratio is in 20:1~60:1；
As SiC or B4C or TiB2Or Si3N4Or stratified material of the WC as thin layer, thickness rate is in 3:1~20:1；
The Thickness ratio of the gradient layer is to successively decrease from top to bottom；
The preparation of step 3, biscuit of ceramics: ceramic layered precast body is put into 100-200 DEG C of vulcanizing press in 10-
1-3h is kept the temperature under 30MPa pressure, ceramic layered biscuit is made；
Step 4: the graphite jig equipped with biscuit of ceramics being placed in hot pressing furnace, is heated up with the speed of 10-20 DEG C/min
To 1750 DEG C -2050 DEG C, 1-2h, sintering pressure 20-40MPa, sintering atmosphere Ar or vacuum are kept the temperature, cools to room temperature with the furnace,
High tenacity stratiform shock resistance ceramics are made.
The tape casting prepares ceramic membrane: first: by 35-50 parts of SiC or B4C or Si3N4Or TiB2Or BN or graphite
Or WC powder, 40-55 parts of etoh solvent solution, 2-5 parts of dispersing agents are added in spheroidal graphite tank and obtain premixed liquid after mixing 24-48h；So
Afterwards by 5-10 parts of binder polyvinyl butyral, 2-5 parts of plasticizer is added in premixed liquid to be flowed after mixing 24-48h
Prolong slurry；Ceramic membrane is obtained after curtain coating slurry is carried out froth in vacuum, curtain coating, drying, cutting, demoulding again；The plasticizer
For glycerine and the dioctyl phthalate mixed liquor that 1:2-1:1 is mixed by volume.
When powder is as interface thin layer, the powder of the thick-layer of system corresponding to 30-50 parts of addition.
The dispersing agent is one or both of polyvinylpyrrolidone, triethyl phosphate.
The diameter of particle is 1-5 μm.
Beneficial effect
The preparation side of a kind of high tenacity stratiform bullet-resistant ceramic material and the tape casting combination hot pressing sintering method proposed by the present invention
Method includes the following steps: (1), ceramic sheet preparation: the curtain coating of slurry, drying, demoulding, cutting；(2), structure designs: will not
Congruent ceramic sheet carries out lamination according to certain Thickness ratio and sequence；(3), the preparation of biscuit of ceramics: certain pressure,
At a temperature of be pressed；(4), the hot pressed sintering preparation of high tenacity stratiform bullet-resistant ceramic material.The present invention uses the tape casting
In conjunction with high tenacity stratiform bullet-resistant ceramic material prepared by hot pressing sintering method, the crack deflection toughening at weak binding interface, Qiang Jie are utilized
The residual stress toughening mode for closing interface improves the damage tolerance of material, designs in conjunction with the Impedance matching of layer structure
Substantially increase shock resistance；Use the structure designability of the tape casting combination hot pressing sintering method for various bulletproof armours simultaneously
Manufacture provide possibility.
A kind of method of the tape casting combination hot pressing sintering method preparation high tenacity stratiform bullet-resistant ceramic material of the invention has
Following advantages:
(1), the preparation process of the tape casting combination pressure sintering effectively increases ceramic layered preparation efficiency, realizes structure
Designability, be suitable for industrialized production；
(2), the present invention realizes the designability of thick-layer ratio using the ceramic layered of the tape casting combination pressure sintering preparation,
Interface categories, intensity, the controllable property of wave impedance；
(3), the tape casting combination pressure sintering technique can effectively reduce the porosity, reduce defect, improve the anti-impact of ceramics
Hit performance；
Detailed description of the invention
Fig. 1 is the structure design for the method that the tape casting combination hot pressing sintering method prepares high tenacity stratiform bullet-resistant ceramic material
Figure；
Fig. 2 is the cutting for being cast ceramic membrane, knockout course；
Fig. 3 is the macrofracture pattern of high tenacity stratiform bullet-resistant ceramic material prepared by embodiment 1；
Fig. 4 is the Fracture scan electron microscope of high tenacity homogeneous texture stratiform bullet-resistant ceramic material prepared by embodiment 1；
Fig. 5 is the Fracture scan electron microscope of high tenacity gradient-structure stratiform bullet-resistant ceramic material prepared by embodiment 1；
Fig. 6 is the Fracture scan electron microscope of high tenacity weak interface stratiform bullet-resistant ceramic material prepared by embodiment 2；
Fig. 7 is the surface topography map of high tenacity strong interface stratiform bullet-resistant ceramic material prepared by embodiment 2；
Specific embodiment
Now in conjunction with embodiment, attached drawing, the invention will be further described:
Structure design: structure design is divided into two classes: one kind is the weak layer with the BN or graphite at weak binding interface, shellproof
The presence that the promotion of performance has benefited from weak interface increases the extensions path of crackle, and the amount of deflection of material increases, and greatly improves
Toughness, under this biggish design of adjacent materials wave impedance ratio, the consumption of material shock wave and dispersion effect are more preferable,
Material failure caused by stress is concentrated is avoided, the raising of toughness makes material that can preferably keep complete under shock loading
Property, have the ability of anti-repeat impact；Another kind of is the SiC or B with strong combination interface4C or TiB2Or the strong layer of WC, it is adjacent
The mismatch of the thermal expansion coefficient of layer produces residual stress in material internal, improves the intensity and toughness of material, different layers
Wave impedance mismatch changes the circulation way of shock wave, improves the protective capacities of material.
When the overlapping ceramic membrane of multilayer, thick-layer is conforming layer structure or gradient layer structure, and thick-layer and thin layer when lamination
It cannot be ceramic membrane material of the same race；The thickness of the thick-layer are as follows: 0.15~0.5mm；The thickness of thin layer of monolithic be 0.05~
0.1mm；The ceramic membrane is SiC or B4C or Si3N4Or TiB2Or the ceramic membrane of BN or graphite or WC material, wherein BN or
Graphite or WC material are only capable of using as thin layer, SiC or B4C or Si3N4Or TiB2It can be thin layer also can be thick-layer.
When the stratified material of BN or graphite as thin layer, Thickness ratio is in 20:1~60:1.
As SiC or B4C or TiB2Or Si3N4Or stratified material of the WC as thin layer, thickness rate is in 3:1~20:1.
Preparation step:
(1), prepared by ceramic sheet: preparing ceramic membrane using the tape casting, ceramic membrane main component is SiC or B4C or
Si3N4Or TiB2Or BN or graphite or WC, wherein BN or graphite or WC material can only be used as thin layer, SiC or B4C or Si3N4
Or TiB2Both thin layer, which can have been served as, can also act as thick-layer；The thickness of the monolithic thick-layer of preparation are as follows: 0.15~0.5mm, monolithic
Thickness of thin layer is 0.05~0.1mm, and dry ceramic casting belt is cut, is demoulded；
(2), alternately lamination is carried out according to different Thickness ratios obtain that there is the stratiform of conforming layer structure or gradient layer structure pottery
Porcelain precast body: thick-layer and thin layer cannot be a kind of material simultaneously when lamination, wherein for the material of uniform layer thickness ratio: as BN or
Stratified material of person's graphite as thin layer, optimal Thickness ratio is in 20:1~60:1；As SiC or B4C or TiB2Or Si3N4Or WC
As the stratified material of thin layer, optimal Thickness ratio is in 3:1~20:1；For the material of gradient Thickness ratio, Thickness ratio from up to
Under successively decrease, be now exemplified below: corresponding when stratified material as thin layer of BN or graphite assuming that thickness of thin layer is 1
Thick-layer is respectively 60,50,40,30,20,10,5；As SiC or B4C or TiB2Or Si3N4Or stratified material of the WC as thin layer, it is right
The thick-layer answered is respectively 20,15,10,5,3,1；
(3), the preparation of biscuit of ceramics: ceramic layered precast body certain pressure, at a temperature of molding pressure after prepare ceramics element
Base；
Precast body is put into 100-200 DEG C of vulcanizing press and keeps the temperature 1-3h under 10-30MPa pressure, stratiform pottery is made
Porcelain precast body；
(4), the preparation of the thickness when programmable high tenacity stratiform bulletproof ceramic in interface:
Graphite jig equipped with biscuit of ceramics is placed in hot pressing furnace, is warming up to 1750 with the speed of 10-20 DEG C/min
DEG C -2050 DEG C, 1-2h, sintering pressure 20-40MPa, sintering atmosphere Ar or vacuum are kept the temperature, cools to room temperature with the furnace, height is made
Toughness stratiform bulletproof ceramic.
Hot pressed sintering is carried out after biscuit of ceramics dumping under different sintering temperatures, pressure, atmosphere and prepares stratiform bulletproof ceramic,
Wherein, the ceramic layered system of preparation can select corresponding system, example with application background according to the size of resistance to shock loads
Such as, for the high-explosive plastic projectile of HI high impact wave, it is necessary to have the layered systems at the BN of high wave impedance ratio or graphite or the interface WC to come
Dispersion, consumption shock wave；For carrying the high explosive anti-tank cartridge of high temp jet, SiC layer shape system corrosion-resistant, resistant to high temperature is needed；For
It is necessary to have the B of high rigidity for armor-piercing bullet with high rigidity bullet4C system；For needing high energy-absorbing, heavy armoring application,
It can choose highdensity TiB2Layered system；When for needing lightweight, cheap, high performance physical protection material, Ke Yixuan
Select SiC system.
The ceramic membrane preparation of the cast sheet includes the following steps:
1., by 40-55 parts of SiC powders (wherein sintering aid type be 3-5 powder Al3O2With 3-5 parts of Y2O3Or 0.5-2
The B powder of part and 0.5-2 parts of C powder) or B4C powder (the wherein C powder that sintering aid type is 0.5-2 parts) or Si3N4Powder is (wherein
Sintering aid type is the Al of 3-5 powder3O2With 3-5 parts of Y2O3) or TiB2(wherein sintering aid type is the Al of 3-5 powder to powder3O2With
3-5 parts of Y2O3) or BN powder (wherein sintering aid type, content are consistent with corresponding thick-layer system) or graphite composite powder (wherein help
It is consistent with corresponding thick-layer system to burn agent type, content) or WC powder, 40-55 parts of etoh solvents, 2-5 parts of dispersing agents addition balls
Premixed liquid is obtained after mixing 24-48h in ink tank；When wherein all powders are as interface thin layer, need to add corresponding to 30-50 parts
The powder of system thick-layer: such as preparing stratiform SiC/BN material, and SiC is thick-layer, and when curtain coating prepares BN thin layer, needing will be in thin layer
30-50 parts of BN powder replaces with SiC powder.
2., by 5-10 parts of binder, 2-5 parts of plasticizer is added in premixed liquid mix 24-48h after obtains curtain coating material
Slurry；
3., curtain coating slurry is subjected to froth in vacuum, and adjust the scraper height before and after casting machine, curtain coating, dry, demoulding
After obtain ceramic membrane.
Dispersing agent is one or both of polyvinylpyrrolidone, triethyl phosphate, preferably triethyl phosphate.
Diameter of particle is 1-5 μm.
Binder is polyvinyl butyral, and plasticizer is the mixed liquor of glycerine and dioctyl phthalate, the third three
1:2-1:1 is mixed pure and mild dioctyl phthalate by volume.
Specific embodiment:
Embodiment 1:
Such as attached drawing 1,2,3,4,5, a kind of the tape casting combination hot pressing sintering method of the invention prepares the shellproof pottery of high tenacity stratiform
The method of ceramic material, this method comprises the following steps:
(1), the preparation of ceramic sheet, the specific steps are as follows:
1., thick-layer: by 40kg SiC powder and 1.6gY2O3With 2.4g Al2O3Powder mixed powder, the mixing of 47kg ethyl alcohol
Liquid, 2kg triethyl phosphate is added in spheroidal graphite tank to mix obtains premixed liquid afterwards for 24 hours；The partial size of powder is 0.5 μm；
Thin layer: 20Kg BN powder, 20Kg SiC powder and 1.6gY2O3With 2.4g Al2O3Powder mixed powder, 47kg second
Alcohol mixed liquor, 2kg triethyl phosphate is added in spheroidal graphite tank to mix obtains premixed liquid afterwards for 24 hours；The partial size of powder is 0.5 μm；
2., by 5kg polyvinyl butyral, two kinds of premixs are added in 2kg glycerine and dioctyl phthalate mixed liquor
It is mixed in liquid and obtains curtain coating slurry afterwards for 24 hours, wherein 1:1 is mixed by volume for glycerine and dioctyl phthalate；
3., curtain coating slurry is subjected to froth in vacuum, and adjust the scraper height before and after casting machine, curtain coating, it is dry, cut
Cut, demould after obtain ceramic membrane.
(2), structure designs, the specific steps are as follows:
Ceramic sheet is replaced into lamination, 5 SiC ceramic films and 1 BN potsherd are a unit, and 15 units are stacked
Together, there is the biscuit film of homogeneous texture as preparation；It is a unit by 30 SiC ceramic films and 1 BN potsherd,
It is a unit by 25 SiC ceramic films and 1 BN potsherd, is a list by 20 SiC ceramic films and 1 BN potsherd
5 SiC ceramic films and 1 BN potsherd are a unit, this 6 kinds of units are superimposed in order, made by member ... ...
For the biscuit film for preparing gradient-structure.
(3), the preparation of biscuit of ceramics, the specific steps are as follows:
Precast body is put into 150 DEG C of vulcanizing presses and keeps the temperature 1.5h under 20MPa pressure, is made ceramic layered prefabricated
Body.
(4), the preparation of stratiform shock resistance SiC based composite ceramic material, the specific steps are as follows:
Graphite jig equipped with biscuit of ceramics is placed in hot pressing furnace, is warming up to 1800 DEG C with the speed of 15 DEG C/min,
1h is kept the temperature, sintering pressure 30MPa, sintering atmosphere Ar cool to room temperature with the furnace, and high tenacity SiC/BN stratiform bulletproof ceramic is made.
Wherein, the sheet thickness of the tape casting preparation can pass through with the height by control scraper from 0.05mm to 0.3mm
Number of sheets is controlled, to control every layer of thickness, and then the designability of Thickness ratio is realized, its performance is made to meet different applications
Demand.For example need to design the stratiform SiC/BN ceramics that Thickness ratio is 10:1: the SiC sheet thickness for being cast preparation is 0.2mm, BN
With a thickness of 0.1mm, then 5 SiC curtain coating thin slices are needed to be superimposed, then be superimposed with 1 BN cast sheet, this is a thickness ratio
The structural unit of 10:1, multiple structural units are superimposed, and just to have prepared Thickness ratio programmable ceramic layered.
Embodiment 2:
As shown in Figures 6, 7, a kind of the tape casting combination hot pressing sintering method of the present invention prepares high tenacity stratiform bulletproof ceramic material
The method of material, this method comprises the following steps:
(1), it is cast preparation of sections, the specific steps are as follows:
1., thick-layer: by 45.6kg SiC powder and 0.96Kg B powder and 1.44Kg C powder mixed powder, 40kg ethyl alcohol is mixed
Liquid is closed, 2kg triethyl phosphate is added in spheroidal graphite tank to mix obtains premixed liquid afterwards for 24 hours；The partial size of powder is 0.5 μm；
Thin layer: 22.8Kg BN powder, 22.8Kg SiC powder and 0.96Kg B powder and 1.44Kg C powder mixed powder,
40kg alcohol mixeding liquid, 2kg triethyl phosphate is added in spheroidal graphite tank to mix obtains premixed liquid afterwards for 24 hours；The partial size of powder is 0.5 μ
m；
Thin layer: 22.8Kg B4C powder, 22.8Kg SiC powder and 0.96Kg B powder and 1.44Kg C powder mixed powder,
40kg alcohol mixeding liquid, 2kg triethyl phosphate is added in spheroidal graphite tank to mix obtains premixed liquid afterwards for 24 hours；The partial size of powder is 0.5 μ
m；
2., 7kg polyvinyl butyral, 3kg glycerine and dioctyl phthalate mixed liquor be separately added into three kinds
It is mixed in premixed liquid and obtains curtain coating slurry afterwards for 24 hours, wherein 1:2 is mixed by volume for glycerine and dioctyl phthalate；
3., curtain coating slurry is subjected to froth in vacuum, and adjust the scraper height before and after casting machine, curtain coating, it is dry, cut
Cut, demould after obtain ceramic membrane.
(2), structure designs, the specific steps are as follows:
Ceramic sheet is replaced into lamination, 5 SiC ceramic films and 1 BN or B4C potsherd is a unit, by 15
Unit is stacked together, and has the biscuit film of homogeneous texture as preparation.
(3), the preparation of biscuit of ceramics, the specific steps are as follows:
Precast body is put into 150 DEG C of vulcanizing presses and keeps the temperature 1h under 30MPa pressure, be made stratiform SiC/BN or
SiC/B4C ceramics preparative body.
(4), the preparation of stratiform shock resistance SiC based composite ceramic material, the specific steps are as follows:
Graphite jig equipped with biscuit of ceramics is placed in hot pressing furnace, is warming up to 2050 DEG C with the speed of 10 DEG C/min,
1h, sintering pressure 30MPa are kept the temperature, vacuum-sintering cools to room temperature with the furnace, and high tenacity SiC/BN or SiC/B is made4C stratiform
Bulletproof ceramic.
Claims (8)
1. a kind of high tenacity stratiform bullet-resistant ceramic material, it is characterised in that including the ceramic membrane that multilayer overlaps, when multilayer overlaps
Thick-layer is conforming layer structure or gradient layer structure, and thick-layer and thin layer cannot be ceramic membrane material of the same race when lamination；The thickness
The thickness of layer are as follows: 0.15~0.5mm；The thickness of thin layer of monolithic is 0.05~0.1mm；The ceramic membrane is SiC or B4C or
Si3N4Or TiB2Or the ceramic membrane of BN or graphite or WC material, wherein BN or graphite or WC material are only capable of using as thin layer,
SiC or B4C or Si3N4Or TiB2It can be thin layer also can be thick-layer.
2. high tenacity stratiform bullet-resistant ceramic material according to claim 1, it is characterised in that: when BN or graphite are as thin layer
Stratified material, Thickness ratio is in 20:1~60:1.
3. high tenacity stratiform bullet-resistant ceramic material according to claim 1, it is characterised in that: as SiC or B4C or TiB2Or
Si3N4Or stratified material of the WC as thin layer, thickness rate is in 3:1~20:1.
4. high tenacity stratiform bulletproof ceramic material any one of described in a kind of the tape casting combination hot pressing sintering method preparation claims 1 to 3
The method of material, it is characterised in that steps are as follows:
Step 1, ceramic sheet preparation: ceramic membrane is prepared using the tape casting, dry ceramic casting belt is cut, is taken off
Mould；The ceramic sheet uses SiC or B according to the structure design of material4C or Si3N4Or TiB2Or BN or graphite or WC；It is described
The thickness of ceramic sheet is designed according to the structure of material are as follows: the thickness of thick-layer are as follows: 0.15~0.5mm；The thickness of thin layer of monolithic is
0.05~0.1mm；
Step 2: being designed according to the structure of material, multi-layer ceramics film is mutually overlapped and forms conforming layer structure or gradient layer knot
Structure carries out alternately lamination according to different Thickness ratios and obtains the ceramic layered precast body with conforming layer structure or gradient layer structure；
Wherein BN or graphite or WC material are only capable of using as thin layer, SiC or B4C or Si3N4Or TiB2It can be that thin layer also can be
Thick-layer；
When the stratified material of BN or graphite as thin layer, Thickness ratio is in 20:1~60:1；
As SiC or B4C or TiB2Or Si3N4Or stratified material of the WC as thin layer, thickness rate is in 3:1~20:1；
The Thickness ratio of the gradient layer is to successively decrease from top to bottom；
The preparation of step 3, biscuit of ceramics: ceramic layered precast body is put into 100-200 DEG C of vulcanizing press in 10-30MPa
1-3h is kept the temperature under pressure, ceramic layered biscuit is made；
Step 4: the graphite jig equipped with biscuit of ceramics being placed in hot pressing furnace, is warming up to the speed of 10-20 DEG C/min
1750 DEG C -2050 DEG C, 1-2h, sintering pressure 20-40MPa, sintering atmosphere Ar or vacuum are kept the temperature, cools to room temperature with the furnace, made
Obtain high tenacity stratiform shock resistance ceramics.
5. according to the method described in claim 4, it is characterized by: the tape casting prepares ceramic membrane is: first: by 35-
50 parts of SiC or B4C or Si3N4Or TiB2Or BN or graphite or WC powder, 40-55 parts of etoh solvent solution, 2-5 parts of dispersing agents add
Premixed liquid is obtained after mixing 24-48h in goal ink tank；Then by 5-10 parts of binder polyvinyl butyral, 2-5 parts of increasing
Modeling agent is added in premixed liquid and obtains curtain coating slurry after mixing 24-48h；Again by curtain coating slurry carry out froth in vacuum, curtain coating, drying,
Ceramic membrane is obtained after cutting, demoulding；The plasticizer is that 1:2-1:1 is mixed by volume for glycerine and dioctyl phthalate
The mixed liquor of conjunction.
6. according to the method described in claim 5, it is characterized by: it is right to add 30-50 parts of institutes when powder is as interface thin layer
Answer the powder of the thick-layer of system.
7. according to the method described in claim 5, it is characterized by: the dispersing agent is polyvinylpyrrolidone, tricresyl phosphate
One or both of ethyl ester.
8. according to the method described in claim 5, it is characterized by: the diameter of particle is 1-5 μm.
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| CN116003133A (en) * | 2021-10-22 | 2023-04-25 | 宁波伏尔肯科技股份有限公司 | Method for controlling residual stress of layered ceramic material, method for producing layered ceramic material, layered ceramic material and use thereof |
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