CN104972130B - The gel injection moulding preparation of metal and ceramic gradient material in alternating magnetic field - Google Patents
The gel injection moulding preparation of metal and ceramic gradient material in alternating magnetic field Download PDFInfo
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Abstract
The gel injection moulding preparation of metal and ceramic gradient material, belongs to field of material preparation in a kind of alternating magnetic field.Its step is：1）Mould prepares；2）After metal dust and ceramic powders are mixed with water or nonaqueous solvents by a certain percentage, the slurry of even dispersion, casting is made in stirring in ball mill；3）Apply alternating magnetic field outside mould, current strength is 0.1~20A, and power frequency is 102~105Hz, action time is 1~20min；4）Gel, dries, sinters.This have the advantage that：By changing current strength, power frequency and magnetic fields time, the functionally gradient material (FGM) of heterogeneity distribution can be obtained；Make to prepare the formality simplification of functionally gradient material (FGM), cost reduction, performance raising using ripe Ceramic gel injection molding forming technology.
Description
Technical field
The present invention relates to a kind of gel injection moulding preparation of metal and ceramic gradient material in alternating magnetic field, belong to material
Preparation field.
Background technology
Ceramic material is widely applied because of properties such as its unique high rigidity, high abrasion, high temperature resistant, chemical property stabilizations
In industrial circles such as electronics, machinery, national defence.But fragility is big after ceramic material sintering, bad mechanical property, it is difficult to be machined out.
The forming method of ceramic material, generally can be divided into the major class of dry and wet two.Comparatively speaking, wet therapy forming process equipment it is simple,
Molding blank component is uniform, defect is few, be easy to shaping complicated shape part the advantages of, practicality is stronger.But traditional wet method into
Type technology all be present, absorbs water to realize by plaster mold such as injection forming, causes to form density gradient in base substrate
Distribution and inhomogeneous deformation, and blank strength is low, it is easy to damage.Injection moulding or injection moulding need to add mass fraction and be up to
20% wax or organic matter, causes skimming processes cumbersome, and the thawing or evaporation of bonding agent make the intensity decreases of base substrate, is easily formed and lacked
Fall into and even collapse.These problems improve the production cost of ceramic material, reduce the stability of its quality.It is the beginning of the nineties, beautiful
State's Oak Ridge National Laboratory has invented a kind of brand-new ceramic material wet-forming technique-Gelcasting Technique, mainly
Production process is：Mixing → shaping of ceramic raw material and medium → exclusion medium → drying → sintering.
Traditional ceramic preparation method combination organic monomer polymerization is generated high molecular method by the technology, utilizes organic list
Ceramic powder suspended substance in-situ solidifying is prepared complicated shape by body polymerization by technical process such as drying, dumping, sintering afterwards
Near net-shape ceramic component.The technical characterstic is：Organic monomer content is low, and product size precision is high, and blank strength is high, can carry out
Machining, hence it is evident that better than the moulding process of other complicated shape ceramic components, organic additive is free of residual impurity after burning,
It is widely applied in high-quality, special shape high technology ceramics element production.
FGM（FGM）It is that class composition structure and performance are continuous or quasi-continuous in material thickness or length direction
The inhomogeneous composite materials of change.If the component one kind for constituting functionally gradient material (FGM) is ceramics, another is metal, then can be real
The performance all not reached during existing ceramics and metal exclusive use.Main preparation methods have powder compacting, vapour deposition process, self- propagating
React synthesis, plasma spraying, electrocasting, galvanoplastic, laser sintered and centrifugal casting etc..These preparation methods require complicated
Technique or equipment, need constantly feed change composition or technological parameter in preparation process mostly.Lack the preparation side of simplicity
Method, is the major reason that limitation function functionally gradient material (FGM) further develops.
At present, for many important FGMs such as：ZrO2/Ni, ZrO2/ steel, Al2O3/Ni, SiC/Fe etc.,
The transition metal such as metal constituent element Fe, Ni, Co belong to ferromagnetic material, and ceramic component A l2O3, ZrO2, SiC, AlN, Si3N4
Etc. being weak magnetic substance.Ferromagnetic material has ferromagnetism below Curie temperature, and weak magnetic substance is insensitive to magnetic field.Profit
With the difference of magnetic property therebetween, our groups successively use adopts in magnetostatic field, pulsed magnetic field, rotating excitation field and moving magnetic field
Functionally gradient material (FGM) is successfully prepared with gel injection-moulding method, correlation technique authorized patent of invention.
Regrettably, although above-mentioned several method can prepare FGM, to the magnetic property of sample constituent element
Require.There must be ferromagnetism in the component of system（Ferromagnetism, ferrimagnetism）Constituent element and weak magnetic（Anti-ferromagnetism, paramagnetism,
Diamagnetism）Constituent element, otherwise can not be prepared using the above method.Therefore, there is significant limitations in above-mentioned several method.In the past few years,
Our groups update on original experiment basis, and make a breakthrough.On the basis of gel casting forming, profit
The movement of metal constituent element is controlled with alternating magnetic field, the continuous metal and ceramic gradient material of composition has successfully been prepared.
The present invention principle be：Metal material generally has good electric conductivity, can be because of the company in magnetic field in alternating magnetic field
Continue change and produce induced-current in material internal, judged according to Lenz's law, the magnetic field that induced current is produced should be hindered
The change of interior flux.Therefore, Induced magnetic field can produce the effect of power, magnetic force with alternating magnetic fieldFSize be：
Wherein,VIt is particle volume,MFor particle induced magnetism intensity, gradHFor magnetic field gradient.Magnetization M and input
Current strength is directly related, and current strength is bigger, then the intensity of magnetization of inducting is bigger.The location of magnetic field gradient and particle have
Close：In coil center of inside position, Distribution of Magnetic Field is uniform, and magnetic field gradient is zero, therefore the magnetic force that particle is subject to is zero；In coil
End position, magnetic field gradient is maximum, at the position, and the magnetic force that metallic particles is subject to is maximum.Therefore, metallic particles is by magnetic force
Size and the position of current strength, the frequency of alternating magnetic field and metal in magnetic field have relation.The usual resistance of ceramic material
Rate is very high, does not have vortex in alternating magnetic field and produces, therefore is not influenceed by alternating magnetic field.Then, based on metal and ceramic group
Member is different to alternating magnetic field corresponding, distribution of the metal constituent element in compound system can be controlled using alternating magnetic field, by solidifying
Glue injection molding prepares metal and ceramic gradient material.
The outstanding advantages of this method are exactly to apply alternating magnetic field on the basis of gel injection molding and forming technology to prepare gradient material
Material, by adjusting the technological parameters such as current strength, frequency, can easily prepare composition consecutive variations and controllable gradient material
Material, cost is substantially reduced.
The content of the invention
It is an object of the invention to provide a kind of gel injection moulding preparation of metal and ceramic gradient material in alternating magnetic field.
The present invention's concretely comprises the following steps：
Step 1）Mould prepares
This method is to mould without rigors, and non-conductive, non-magnetic material can be as mould, such as：Glass, plastics,
Gypsum etc.；
Step 2）It is prepared by slurry
It it is 0.1~1000 μm by the metallic particles of good electric conductivity that particle size is 0.1~1000 μm and particle size
High resistivity ceramic particle in mass ratio 0.1~10：1 is mixed into mixed-powder；By organic monomer and crosslinking agent by 6~
24：1 weight ratio is dissolved in deionized water, is made into the premixed liquid that organic matter mass fraction is 10~25%；Mixed-powder is added
In premixed liquid, while adding dispersant, 1~10h of ball milling in ball mill, ultrasonic dispersionization handles 1~15min, obtained more
It is 50~70% to dissipate solid volume content in slurry, slurry；
Described metallic particles is the good electric conductivity materials such as Cu, Al, Ag, Mg, Zn, Fe；
Described ceramic particle is ZrO2、SiC、SiO2、TiC、Y2O3、Al2O3Deng high resistivity material；
Described organic monomer is acrylamide, Methacrylamide or vinyl pyrrole ketone；
Described crosslinking agent is methylene-bisacrylamide；
Described dispersant is ammonium polyacrylate, SD-38, JA-281 or D3005, and dispersant is stock quality
0.05%~0.50%；
Step 3）Casting in alternating magnetic field
Initiator and catalyst will be added in disperse slurry, injected after stirring and apply alternating magnetic field, sample outside mould, mould
Positioned at alternating magnetic field end turn, current strength is 0.1~20A, and power frequency is 102~105Hz, action time be 1~
20min；
By action of alternating magnetic field, the metal inside of electric conductivity produces induced current, and then produces Induced magnetic field, Induced magnetic field
Interaction between nascent magnetic field is driven metal, and then the forming component gradient in system.Reduce alternating current
Intensity and frequency, the driving force reduction that metal constituent element is subject to, component gradient reduce.Improve alternating current intensity and frequency, metal
The driving force increase that constituent element is subject to, component gradient then increases.In the presence of alternating magnetic field, alternating current intensity and frequency are from small
During increase, metal and ceramic particle are built up to two ends respectively.
Described initiator is the over cure aqueous acid that mass fraction is 1~5%, addition for stock quality 0.3~
3%；
Described catalyst is tetramethylethylenediamine content, and addition is 0.5~the 5 ‰ of stock quality；
Described alternating magnetic field is the magnetic field produced by alternating current by coil；
Step 4）Gel, drying, sintering
Slurry is placed in 5~60min of gel in 60~80 DEG C of baking oven, then in drying at room temperature.Take out green compact and be put into burning
In freezing of a furnace, it is filled with argon gas or nitrogen is protected, sintering temperature cools to 100~300 DEG C with the furnace between 600~1400 DEG C
Take out.
It is an advantage of the invention that：
1）By applying alternating magnetic field, change current strength, power frequency, magnetic fields time, can be in very big composition
In the range of prepare the functionally gradient material (FGM)s of various thickness, composition transfer is controllable；
2）Compared with preparing FGM under magnetostatic field, under the conditions of pulse and rotating excitation field, alternating magnetic field is to constituent element
Magnetic do not require, it is thus only necessary to one of which constituent element is conductive metal, therefore breaches the limitation of above-mentioned technology, is applicable
Scope is wider；
3）Make to prepare the process simplification of functionally gradient material (FGM), cost reduction using ripe Gel-casting process.
Embodiment
The functionally gradient material (FGM) preparation method of the present invention is by metal dust（The good electric conductivity thing such as Cu, Al, Ag, Mg, Zn, Fe
Matter）With ceramic powders（ZrO2、SiC、SiO2、TiC、Y2O3、Al2O3Deng high resistivity material）With solvent mixing composition slurry, pour
Enter dies cavity, shaped in alternating magnetic field.Metal constituent element in slurry is migrated by the effect of alternating magnetic field, so as to be formed into
Divide gradient.The blank of acquisition is aggregated, dry, functionally gradient material (FGM) is made after sintering.
What the present invention was used comprises the following steps that：
1）The preparation of mould
This method is to mould without rigors, and non-conductive, non-magnetic material can be as mould, such as：Glass, plastics,
Gypsum etc.；
2）It is prepared by slurry
By the metallic particles that particle size is 0.1~1000 μm（In the good electric conductivity material such as Cu, Al, Ag, Mg, Zn, Fe
One kind）With the ceramic particle that particle size is 0.1~1000 μm（ZrO2、SiC、SiO2、TiC、Y2O3、Al2O3Deng high resistivity
One kind in material）In mass ratio 0.1~10：1 is mixed into mixed-powder；By organic monomer（Acrylamide, Methacrylamide
Or one kind in vinyl pyrrole ketone）6~24 are pressed with crosslinking agent methylene-bisacrylamide：1 weight ratio dissolves in deionized water
In, it is made into the premixed liquid that organic matter mass fraction is 10~25%；Mixed-powder is added in premixed liquid, while adding dispersant
（One kind in ammonium polyacrylate, SD-38, JA-281 or D3005）, dispersant is the 0.05%~0.50% of stock quality,
1~10h of ball milling in ball mill, ultrasonic dispersionization handles 1~15min, obtains solid volume content in disperse slurry, slurry
For 50~70%；
Step 3）Casting in alternating magnetic field
Add in the slurry and occupy the initiator ammonium persulfate solution of machine amount of monomer 0.3~3% and occupy machine amount of monomer 0.5
~5 ‰ catalyst tetramethylethylenediamine, is filled with mould after stirring, and applies alternating magnetic field outside mould, and sample, which is located at, to be handed over
Varying magnetic field end turn；Alternating magnetic field is the magnetic field produced by alternating current by coil, and current strength is 0.1~20A, electric current
Frequency is 102~105Hz, action time is 1~20min；
By action of alternating magnetic field, the metal inside of electric conductivity produces induced current, and then produces Induced magnetic field, Induced magnetic field
Interaction between nascent magnetic field is driven metal, and then the forming component gradient in system.Reduce alternating current
Intensity and frequency, the driving force reduction that metal constituent element is subject to, component gradient reduce.Improve alternating current intensity and frequency, metal
The driving force increase that constituent element is subject to, component gradient then increases.In the presence of alternating magnetic field, alternating current intensity and frequency are from small
During increase, metal and ceramic particle are built up to two ends respectively；
Step 4）Gel, drying, sintering
Slurry is placed in 5~60min of gel in 60~80 DEG C of baking oven, then in drying at room temperature.Take out green compact and be put into burning
In freezing of a furnace, it is filled with argon gas or nitrogen is protected, sintering temperature cools to 100~300 DEG C with the furnace between 600~1400 DEG C
Take out.
The functionally gradient material (FGM) for the various thickness that can be in very large range changed with prepared composition by the present invention, and composition is continuous
Change, finished product internal flaw is few, close structure.
Embodiment 1：
1）The preparation of mould
Using lucite mould, mould inside die cavity is that height is 15mm, a diameter of 15mm disk；
2）It is prepared by slurry
By the ZrO that Ni metal particle and particle size that particle size is 0.1 μm are 0.1 μm2Ceramic particle is in mass ratio
0.1：1 is mixed into mixed-powder；Organic monomer acrylamide and crosslinking agent methylene-bisacrylamide are pressed 6：1 weight is than molten
Enter in deionized water, be made into the premixed liquid that organic matter mass fraction is 10%；Mixed-powder is added in premixed liquid, added simultaneously
Dispersants ammonium polyacrylate, dispersant is the 0.05% of stock quality, the ball milling 1h in ball mill, at ultrasonic dispersion
1min is managed, it is 50% to obtain solid volume content in disperse slurry, slurry；
Step 3）Casting in alternating magnetic field
Add in the slurry and occupy the initiator ammonium persulfate solution of machine amount of monomer 0.3% and occupy machine amount of monomer 0.5 ‰
Catalyst tetramethylethylenediamine, is filled with mould after stirring, and applies alternating magnetic field outside mould, and sample is located at alternating magnetic field line
Enclose end；Alternating magnetic field is the magnetic field produced by alternating current by coil, and current strength is 0.1A, and power frequency is 102Hz,
Action time is 1min；
Step 4）Gel, drying, sintering
Slurry is placed in gel 5min in 60 DEG C of baking oven, then in drying at room temperature.Take out green compact to be put into sintering furnace, fill
Enter argon gas to be protected, sintering temperature cools to 100 DEG C of taking-ups with the furnace at 600 DEG C.
Prepared sample tissue is fine and close, and porosity is low, surfacing.Electron probe line analysis, composition are carried out to sample
Consecutive variations, no macroscopic interface is present, and Cu contents are reduced to the 3% of opposite side by the 21% of side.
Embodiment 2：
1）The preparation of mould
Using gypsum mold, mould inside die cavity is that height is 15mm, a diameter of 15mm disk；
2）It is prepared by slurry
It is 0.1~1000 μm of SiC ceramic particle by quality by metal Al particles that particle size is 1 μm and particle size
Than 1：1 is mixed into mixed-powder；Organic monomer Methacrylamide and crosslinking agent methylene-bisacrylamide are pressed 8：1 weight
Than dissolving in deionized water, the premixed liquid that organic matter mass fraction is 15% is made into；Mixed-powder is added in premixed liquid, simultaneously
Dispersant SD-38 is added, dispersant is the 0.1% of stock quality, the ball milling 2h in ball mill, ultrasonic dispersionization processing
3min, it is 60% to obtain solid volume content in disperse slurry, slurry；
Step 3）Casting in alternating magnetic field
Addition occupies the initiator ammonium persulfate solution of machine amount of monomer 1% and occupies the catalysis of machine amount of monomer 1 ‰ in the slurry
Agent tetramethylethylenediamine, is filled with mould after stirring, and applies alternating magnetic field outside mould, and sample is located at alternating magnetic field coil-end
Portion；Alternating magnetic field is the magnetic field produced by alternating current by coil, and current strength is 0.5A, and power frequency is 103Hz, effect
Time is 3min；
Step 4）Gel, drying, sintering
Slurry is placed in gel 10min in 70 DEG C of baking oven, then in drying at room temperature.Green compact are taken out to be put into sintering furnace,
It is filled with nitrogen to be protected, sintering temperature cools to 200 DEG C of taking-ups with the furnace at 800 DEG C.
Prepared sample tissue is fine and close, and porosity is low, surfacing.Electron probe line analysis, composition are carried out to sample
Consecutive variations, no macroscopic interface is present, and Al content is reduced to the 31% of opposite side by the 74% of side.
Embodiment 3：
1）The preparation of mould
Using wooden model, mould inside die cavity is that height is 15mm, a diameter of 15mm disk；
2）It is prepared by slurry
By the SiO that metal Ag particles and particle size that particle size is 10 μm are 10 μm2Ceramic particle is in mass ratio
0.1：1 is mixed into mixed-powder；Organic monomer vinyl pyrrole ketone and crosslinking agent methylene-bisacrylamide are pressed 12：1 weight
Amount ratio is dissolved in deionized water, is made into the premixed liquid that organic matter mass fraction is 20%；Mixed-powder is added in premixed liquid, together
When add dispersant JA-281, dispersant be stock quality 0.20%, the ball milling 5h in ball mill, ultrasonic dispersion
5min is handled, it is 70% to obtain solid volume content in disperse slurry, slurry；
Step 3）Casting in alternating magnetic field
Addition occupies the initiator ammonium persulfate solution of machine amount of monomer 2% and occupies the catalysis of machine amount of monomer 3 ‰ in the slurry
Agent tetramethylethylenediamine, is filled with mould after stirring, and applies alternating magnetic field outside mould, and sample is located at alternating magnetic field coil-end
Portion；Alternating magnetic field is the magnetic field produced by alternating current by coil, and current strength is 1A, and power frequency is 104Hz, during effect
Between be 8min；
Step 4）Gel, drying, sintering
Slurry is placed in gel 30min in 80 DEG C of baking oven, then in drying at room temperature.Green compact are taken out to be put into sintering furnace,
It is filled with nitrogen to be protected, sintering temperature cools to 300 DEG C of taking-ups with the furnace at 1000 DEG C.
Prepared sample tissue is fine and close, and porosity is low, surfacing.Electron probe line analysis, composition are carried out to sample
Consecutive variations, no macroscopic interface is present, and Ag contents are reduced to the 3% of opposite side by the 34% of side.
Embodiment 4：
1）The preparation of mould
Using plastic mould, mould inside die cavity is that height is 15mm, a diameter of 15mm disk；
2）It is prepared by slurry
By metal Mg particles that particle size is 100 μm and particle size be 100 μm of TiC ceramic particles in mass ratio
10：1 is mixed into mixed-powder；Organic monomer acrylamide and crosslinking agent methylene-bisacrylamide are pressed 6~24：1 weight
Than dissolving in deionized water, the premixed liquid that organic matter mass fraction is 25% is made into；Mixed-powder is added in premixed liquid, simultaneously
Dispersant D3005 is added, dispersant is the 0.50% of stock quality, the ball milling 10h in ball mill, at ultrasonic dispersion
15min is managed, it is 60% to obtain solid volume content in disperse slurry, slurry；
Step 3）Casting in alternating magnetic field
Addition occupies the initiator ammonium persulfate solution of machine amount of monomer 3% and occupies the catalysis of machine amount of monomer 5 ‰ in the slurry
Agent tetramethylethylenediamine, is filled with mould after stirring, and applies alternating magnetic field outside mould, and sample is located at alternating magnetic field coil-end
Portion；Alternating magnetic field is the magnetic field produced by alternating current by coil, and current strength is 5A, and power frequency is 105Hz, during effect
Between be 12min；
Step 4）Gel, drying, sintering
Slurry is placed in gel 60min in 60 DEG C of baking oven, then in drying at room temperature.Green compact are taken out to be put into sintering furnace,
It is filled with argon gas to be protected, sintering temperature cools to 150 DEG C of taking-ups with the furnace at 1400 DEG C.
Prepared sample tissue is fine and close, and porosity is low, surfacing.Electron probe line analysis, composition are carried out to sample
Consecutive variations, no macroscopic interface is present, and Mg contents are reduced to the 72% of opposite side by the 99% of side.
Embodiment 5：
1）The preparation of mould
Using lucite mould, mould inside die cavity is that height is 15mm, a diameter of 15mm disk；
2）It is prepared by slurry
By the Y that metal Zn particles and particle size that particle size is 1000 μm are 1000 μm2O3Ceramic particle is in mass ratio
1：5 are mixed into mixed-powder；Organic monomer Methacrylamide and crosslinking agent methylene-bisacrylamide are pressed 18：1 weight
Than dissolving in deionized water, the premixed liquid that organic matter mass fraction is 20% is made into；Mixed-powder is added in premixed liquid, simultaneously
Dispersant SD-38 is added, dispersant is the 0.30% of stock quality, the ball milling 7h in ball mill, ultrasonic dispersionization processing
6min, it is 70% to obtain solid volume content in disperse slurry, slurry；
Step 3）Casting in alternating magnetic field
Addition occupies the initiator ammonium persulfate solution of machine amount of monomer 2% and occupies the catalysis of machine amount of monomer 3 ‰ in the slurry
Agent tetramethylethylenediamine, is filled with mould after stirring, and applies alternating magnetic field outside mould, and sample is located at alternating magnetic field coil-end
Portion；Alternating magnetic field is the magnetic field produced by alternating current by coil, and current strength is 10A, and power frequency is 104Hz, effect
Time is 15min；
Step 4）Gel, drying, sintering
Slurry is placed in gel 40min in 80 DEG C of baking oven, then in drying at room temperature.Green compact are taken out to be put into sintering furnace,
It is filled with nitrogen to be protected, sintering temperature cools to 200 DEG C of taking-ups with the furnace between 1200 DEG C.
Prepared sample tissue is fine and close, and porosity is low, surfacing.Electron probe line analysis, composition are carried out to sample
Consecutive variations, no macroscopic interface is present, and Zn contents are reduced to the 7% of opposite side by the 39% of side.
Embodiment 6：
1）The preparation of mould
Using sand mo(u)ld, mould inside die cavity is that height is 15mm, a diameter of 15mm disk；
2）It is prepared by slurry
By the Al that metal Fe particles and particle size that particle size is 50 μm are 50 μm2O3Ceramic particle in mass ratio 1：
10 are mixed into mixed-powder；Organic monomer vinyl pyrrole ketone and crosslinking agent methylene-bisacrylamide are pressed 15：1 weight ratio
Dissolve in deionized water, be made into the premixed liquid that organic matter mass fraction is 18%；Mixed-powder is added in premixed liquid, while plus
Enter dispersant D3005, dispersant is the 0.12% of stock quality, the ball milling 4h in ball mill, ultrasonic dispersionization processing
15min, it is 70% to obtain solid volume content in disperse slurry, slurry；
Step 3）Casting in alternating magnetic field
Addition occupies the initiator ammonium persulfate solution of machine amount of monomer 3% and occupies the catalysis of machine amount of monomer 5 ‰ in the slurry
Agent tetramethylethylenediamine, is filled with mould after stirring, and applies alternating magnetic field outside mould, and sample is located at alternating magnetic field coil-end
Portion；Alternating magnetic field is the magnetic field produced by alternating current by coil, and current strength is 20A, and power frequency is 105Hz, effect
Time is 20min；
Step 4）Gel, drying, sintering
Slurry is placed in gel 60min in 80 DEG C of baking oven, then in drying at room temperature.Green compact are taken out to be put into sintering furnace,
It is filled with nitrogen to be protected, sintering temperature cools to 100 DEG C of taking-ups with the furnace at 1400 DEG C.
Prepared sample tissue is fine and close, and porosity is low, surfacing.Electron probe line analysis, composition are carried out to sample
Consecutive variations, no macroscopic interface is present, and Fe contents are reduced to the 2% of opposite side by the 46% of side.
Claims (1)
1. the gel injection moulding preparation of metal and ceramic gradient material in alternating magnetic field, it is characterised in that it the step of be：
1）Mould prepares
Non-conductive and non-magnetic lucite, plastics, gypsum, wooden model or sand mo(u)ld are used as mould；
2）It is prepared by slurry
It is by Cu, Al, Ag, Mg or Zn metallic particles and particle size of good electric conductivity that particle size is 0.1~1000 μm
The ZrO of 0.1~1000 μm of high resistivity2、SiC、SiO2、TiC、Y2O3Or Al2O3Ceramic particle in mass ratio 0.1~10：1 mixes
Synthesize mixed-powder；Organic monomer and crosslinking agent methylene-bisacrylamide are pressed 6~24：1 weight ratio dissolves in deionized water
In, it is made into the premixed liquid that organic matter mass fraction is 10~25%；Mixed-powder is added in premixed liquid, while dispersant is added,
1~10h of ball milling in ball mill, ultrasonic dispersionization handles 1~15min, obtains solid volume content in disperse slurry, slurry
For 50~70%；
Described organic monomer is acrylamide, Methacrylamide or vinyl pyrrole ketone；
Described dispersant is ammonium polyacrylate, SD-38, JA-281 or D3005, and dispersant is the 0.05% of stock quality
~0.50%；
3）Casting in alternating magnetic field
Initiator and catalyst will be added in disperse slurry, initiator is the over cure aqueous acid that mass fraction is 1~5%, added
Measure as the 0.3~3% of stock quality, catalyst is tetramethylethylenediamine content, addition is 0.5~the 5 ‰ of stock quality, is stirred
Injected after mixing and apply alternating magnetic field outside mould, mould, current strength is 0.1~20A, and power frequency is 102~105Hz, during effect
Between be 1~20min；
Described alternating magnetic field is the magnetic field produced by alternating current by coil；
4）Gel, drying, sintering
Slurry is placed in 5~60min of gel in 60~80 DEG C of baking oven, then in drying at room temperature；Take out green compact and be put into sintering furnace
In, it is filled with argon gas or nitrogen is protected, sintering temperature cools to 100~300 DEG C of taking-ups with the furnace between 600~1400 DEG C.
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| CN1206060C (en) * | 2003-05-29 | 2005-06-15 | 上海交通大学 | Method for preparing metal base self-gradient composite rod material and pipe material by using electromagnetic separation process |
| CN1293021C (en) * | 2003-12-18 | 2007-01-03 | 山东理工大学 | Method for producing metal-ceramic gradient materials |
| JP2006327833A (en) * | 2005-05-23 | 2006-12-07 | Kyocera Corp | Ceramic powder and method for manufacturing the same |
| DE102006022147B4 (en) * | 2006-05-08 | 2008-11-27 | Technische Universität Ilmenau | Method and use of a device for the electromagnetic modification of magnetic materials |
| CN1911619B (en) * | 2006-09-01 | 2010-07-28 | 浙江大学 | Preparation method of strong magnetic-weak magnetic gradient material gel injection mould in pulse magnetic field |
| CN102303353B (en) * | 2011-06-29 | 2014-01-29 | 浙江大学 | Gel-casting preparation method for gradient material in moving magnetic field |
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