CN106518090B - A kind of Sialon ceramics friction welding (FW) stirring-head and preparation method thereof - Google Patents
A kind of Sialon ceramics friction welding (FW) stirring-head and preparation method thereof Download PDFInfo
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Abstract
The present invention relates to friction welding (FW) stirring-head technical field, a kind of Sialon ceramics friction welding (FW) stirring-head and preparation method thereof is disclosed.The present invention creatively uses Sialon ceramics to prepare friction welding (FW) stirring-head as raw material, and Sialon ceramics has preferable toughness, very high hardness and wearability and very high high-temperature oxidation resistance, and the Sialon ceramics prices of raw materials are cheap, from a wealth of sources.The present invention also combines traditional ceramics technique and polymer chemistry, the polymerization of high molecular polymer is introduced into the preparation process of ceramics, using gel injection molding and forming technology, this method is compared with other moulding process, and have significant advantage: preparation time is short and keeps its low in cost to mold and equipment requirement be not high；Structure and component designability are strong；The even density of product；Green strength is high, convenient for machining；Near-net-shape especially can be achieved, article shape is limited small, can prepare Complex Different Shape part, also have the characteristics that versatility and economy.
Description
Technical field
The present invention relates to friction welding (FW) stirring-head technical fields, more particularly, to a kind of Sialon ceramics friction welding (FW) stirring-head
And preparation method thereof.
Background technique
The fast development of current high performance ship depends not only on the high-intensitive new diseases such as aluminium alloy, also relies on
The progress of its welding technique.But there are two kinds of different-metal material welding problems of aluminum steel, agitating frictions to weld conduct for high speed Aluminium ships
A kind of novel solid phase connecting method, it is not substantially by factors such as material physical chemistry performance, mechanical performance and crystal structures
It influences, there is great advantage for the welding of dissimilar material.Therefore, agitating friction weldering is to solve current high-speed ship aluminum steel weldering
Connect the preferred interconnection technique of problem.
" heart " that stirring-head is welded as agitating friction, material and structure are the cores of agitating friction welding technology.Stirring
The heat that head directly bears welding process carries, power carries and fretting wear, therefore it is required that the material for being used to manufacture stirring-head need to have height
In the fusing point of materials to be welded, intensity, hardness and toughness, good antiwear property and heat-resisting quantity etc..Aluminum steel is welded, by
Yu Gangwei materials with high melting point, in welding, maximum temperature is up to 1000 DEG C or more.Current common stirring head material is mainly tungsten
Sill and cubic boron nitride.But tungsten is expensive, and tungsten is difficult to be machined, and hardly possible forms special-shaped size element, and stirs
Head is polymorphic structure, therefore tungsten-bast alloy stirring-head manufacturing cost is very high.Cube BN stirring-head high-temperature stability and wearability
Good, elevated temperature strength and hardness are high, but manufacture a cube BN and need high temperature and pressure, and it is also more difficult to form special-shaped size element.Because of thirty years of age
Square BN stirring-head manufacturing cost is also very high, expensive.Therefore, urgent need Development of Novel high-performance high temperature resistant agitating friction welds
Stir head material and its low cost, controllable preparation technology.
Sialon ceramics have at high temperature hardness height, good toughness, creep is small, anti-thermal shock inoxidizability is strong, the coefficient of expansion is small,
The superior physical and chemical performances such as chemical stability is high, wear-resistant, corrosion-resistant.And its process is mature controllably, raw material is domestic
Change degree height, relative inexpensiveness.Therefore, Sialon ceramics is currently to substitute existing high temperature resistant stirring head material, prepares high-performance
The most ideal material system of inexpensive stirring friction welding agitator head.The forming method of Sialon ceramics is mainly heat pressing process at present,
Preparing polymorphic structure stirring-head, to still need to the later period machining.But Sialon ceramics be hard phase, processing difficulties and yield rate compared with
It is low, thus there is also the higher problems of manufacturing cost for Sialon ceramics stirring-head at present, are badly in need of exploitation Sialon ceramics stirring-head net scale
Very little moulding process reduces manufacturing cost.
Summary of the invention
The technical problem to be solved in the present invention is that in view of the deficiencies of the prior art, a kind of Sialon ceramics friction welding (FW) stirring-head
And preparation method thereof.
The purpose of the present invention is achieved by the following technical programs:
A kind of process preparing Sialon ceramics friction welding (FW) stirring-head is provided, comprising the following steps:
S1. Sialon ceramics powder is prepared: according to the molecular formula Si of Sialon ceramics4Al2O2N6It calculates and weighs weighing accordingly
Si3N4, AlN and Al2O3, Y is added2O3After obtain mixing, by gained mixing carry out ball milling, be then dried, seal；
S2. gel casting forming:
S21. premixed liquid is configured, the premixed liquid includes monomer, crosslinking agent and dispersing agent, respectively N- methylol acryloyl
Amine, N, N- dimethyl-ethylenediamine, ammonium polyacrylate；
S22. step S21 premixed liquid is added in the resulting Sialon ceramics powder of step S1, carries out ball milling, obtains required injection molding
Slurry；
S23. ammonium persulfate solution and tetramethylethylenediamine is added in injection molding slurry obtained by step S22 after froth in vacuum,
Polymorphic structure stirring-head mold is injected after being uniformly mixed to be dried after normal temperature cure molding；
S3. degreasing and sintering: green body is made in S2 and is put into nitrogen atmosphere stove progress temperature programming, first completes degreasing, then
It is formed using two-step method, obtains the Sialon ceramics friction welding (FW) stirring-head.
Molecular formula Si is used in step S14Al2O2N6Sialon ceramics reason be that low Z value is serial (Z=0.3, Z=0.6)
β-Sialon during the sintering process easily formed Y2SiAlO5N (B phase), Y2SiAlO5N (B phase) is unfavorable to the toughness of material, must be logical
It crosses control technological parameter and avoids Y2SiAlO5The generation of N (B phase), the β-Sialon of high Z value serial (Z=3,4) is during the sintering process
Easily form Si2Al3O7N and AlN polytype, it is unfavorable to the mechanical property of β-Sialon material.
The present invention creatively uses Sialon ceramics to prepare friction welding (FW) stirring-head as raw material, and Sialon ceramics has preferable
Toughness, very high hardness and wearability and very high high-temperature oxidation resistance, and the Sialon ceramics prices of raw materials are cheap,
It is from a wealth of sources.
The present invention also combines traditional ceramics technique and polymer chemistry, by the polymerization side of high molecular polymer
Method substitutes into the preparation process of ceramics, and using gel injection molding and forming technology, this method has aobvious compared with other moulding process
The advantage of work: preparation time is short and keeps its low in cost to mold and equipment requirement be not high；Structure and component designability are strong；System
The even density of product；Green strength is high, convenient for machining；Especially can be achieved near-net-shape, article shape be limited it is small,
Complex Different Shape part can be prepared, also has the characteristics that versatility and economy.
Preferably, drying process described in step S1 is dry 6~10h in 80 DEG C of baking ovens.
Preferably, Y described in step S12O3For 3~6wt%, Y2O3As stabilizer, it is added in Sialon ceramics powder further
Improve material property.
Preferably, ball milling described in step S1 is further comprising the steps of:
S11. mixing, mill ball and ball-milling medium are fitted into ball grinder according to mass ratio 1:1.5:2；The mill ball choosing
With different size of corundum, the ball-milling medium selects dehydrated alcohol, and the ball grinder selects agate jar；
S12. the ball grinder installed sealing is put into ball milling 20 in planetary ball mill~for 24 hours.
Sialon ceramics Powder Particle Size can be allowed lower using planetary ball mill, be conducive to subsequent processing.
Preferably, N hydroxymethyl acrylamide described in step S21 is 15~20wt%, the N, and N- dimethyl-ethylenediamine is
9~10wt%, the ammonium polyacrylate are 5~6vol%.
Preferably, the ammonium polyacrylate is dissolved in deionized water, and adjusting pH value with ammonium hydroxide is 9~10, has synergy
Effect.
Preferably, ball milling described in step S22 further includes the Y that 8~10wt% is added in mixed liquor2O3With 5~7%wt%
Al2O3As sintering aid, Ball-milling Time is 4~6h.
Preferably, ammonium persulfate solution described in step S23 be 10~12wt%, the tetramethylethylenediamine be 5~
6wt%.
Preferably, drying process described in step S23 is that drying no longer changes to quality in 50~80 DEG C of baking oven, low temperature
Injection molding dead size moulding process, simple process, parameter are controllable, easily prepare Complex Different Shape size stirring-head, and semifinished product precision is high, adds
Spare time amount is few, substantially reduces the preparation cost of stirring-head and its cost of engineering application.
Preferably, degreasing described in step S3 refers under 0.05~0.1Mpa nitrogen atmosphere, with the heating rate of 1 DEG C/min
To 800~900 DEG C of completion degreasings；It is 0.1~2.1MPa that the two-step method, which refers to that green compact are placed on nitrogen pressure by the first step,
1150 DEG C~1850 DEG C of temperature, heating rate be 10 DEG C/min, keep the temperature 1 hour, second step be placed on nitrogen pressure be 2.1~
8.0MPa, 1400 DEG C~1830 DEG C of temperature, heating rate is 10 DEG C/min, keeps the temperature 1 hour.
Using degreasing and two-step method idiosome, it can prepare and rub with fine microstructure and high performance Sialon ceramics
Wipe weldering stirring-head.
Present invention simultaneously provides the processes of the application preparation match ceramic friction weldering stirring-head, and what is be prepared has
Lightweight, high-strength and high ductility, high temperature resistant and excellent wear-resisting property stirring-head.
Compared with prior art, the invention has the following advantages:
The present invention is for the existing high temperature resistant stirring-head cost of raw material is high, preparation process is complicated, difficult processing and processing capacity
Greatly, the high problem of manufacturing cost provides a kind of inexpensive, dead size molding Sialon ceramics stirring-head process, prepared
Stirring-head have the characteristics that lightweight, high-strength and high ductility, high temperature resistant and excellent wear-resisting property.
Sialon ceramics has preferable toughness, very high hardness and wearability and very high high-temperature oxidation resistance, and
And the Sialon ceramics prices of raw materials are cheap, it is from a wealth of sources.
Low temperature injection molding dead size moulding process, simple process, parameter are controllable, easily prepare Complex Different Shape size stirring-head,
Semifinished product precision is high, and machining allowance is few, substantially reduces the preparation cost of stirring-head and its cost of engineering application；And pass through original
Material group meta design and preparation technology parameter adjustment, the optimization and regulation of the institutional framework and performance of Yi Shixian stirring-head.
Sialon ceramics stirring-head high temperature resistant (1000 DEG C or more), intensity and the toughness of preparation are high, wearability is good, service life
It is long.
Detailed description of the invention
X-ray diffraction (XRD) figure of Fig. 1 present invention kind of Sialon ceramics friction welding (FW) stirring-head.
Scanning electron microscope (SEM) figure of Fig. 2 present invention kind of Sialon ceramics friction welding (FW) stirring-head.
Specific embodiment
Present invention be described in more detail in the following with reference to the drawings and specific embodiments.Unless stated otherwise, the present invention is implemented
The various raw materials that example uses can be obtained by regular market purchase, or be prepared according to the conventional method of this field, used to set
Standby is experiment commonly used equipment.Unless otherwise defined or described herein, all professional and scientific terms used herein and this field
Meaning known to person skilled in the art is identical.
Embodiment 1
A kind of process preparing Sialon ceramics friction welding (FW) stirring-head, comprising the following steps:
S1. Sialon ceramics powder is prepared: according to the molecular formula Si of Sialon ceramics4Al2O2N6It calculates and weighs weighing accordingly
Si3N4, AlN and Al2O3, add 3wt%Y2O3, gained mixing is subjected to ball milling, then the dry 6h in 80 DEG C of baking ovens, close
Envelope；
Wherein ball milling is further comprising the steps of:
S11. mixing, different size of corundum and dehydrated alcohol are fitted into agate jar according to mass ratio 1:1.5:2；
S12. the ball grinder installed sealing is put into ball milling 20h in planetary ball mill.
S2. gel casting forming:
S21. configure premixed liquid: 15wt%N- hydroxymethyl acrylamide, 9wt%N, N- dimethyl-ethylenediamine and 5vol% are poly-
Ammonium acrylate, wherein ammonium polyacrylate is dissolved in deionized water, and adjusting pH value with ammonium hydroxide is 9.
S22. premixed liquid obtained by step S21 is added in the resulting Sialon ceramics powder of step S1, is added 8wt%'s after mixing
Y2O3With the Al of 5%wt%2O3As sintering aid, ball milling 4h obtains required injection molding slurry；
S23. the ammonium persulfate solution and 5wt% of 10wt% is added after froth in vacuum in injection molding slurry obtained by step S22
Tetramethylethylenediamine, after being uniformly mixed inject polymorphic structure stirring-head mold, normal temperature cure molding after, in 50 DEG C of baking
Drying no longer becomes to quality in case；
S3. degreasing and sintering:
S31. under 0.05Mpa nitrogen atmosphere, with the heating rate of 1 DEG C/min to 800 DEG C of completion base substrate degreasings.
S32. by degreasing idiosome in S31 be placed on nitrogen pressure be 0.1MPa, temperature be 1150 DEG C, heating rate be 10 DEG C/
Min keeps the temperature 1h；
S33. it is 2.1MPa that later idiosome will be handled in S32 step and be placed on nitrogen pressure, and temperature is 1400 DEG C, heating speed
Rate is 10 DEG C/min, keeps the temperature 1h.
Embodiment 2
A kind of process preparing Sialon ceramics friction welding (FW) stirring-head, comprising the following steps:
S1. Sialon ceramics powder is prepared: according to the molecular formula Si of Sialon ceramics4Al2O2N6It calculates and weighs weighing accordingly
Si3N4, AlN and Al2O3, add 6wt%Y2O3, gained mixing is subjected to ball milling, then the dry 10h in 80 DEG C of baking ovens, close
Envelope；
Wherein ball milling is further comprising the steps of:
S11. mixing, different size of corundum and dehydrated alcohol are fitted into agate jar according to mass ratio 1:1.5:2；
S12. the ball grinder installed sealing is put into planetary ball mill ball milling for 24 hours.
S2. gel casting forming:
S21. premixed liquid is configured: 20wt%N- hydroxymethyl acrylamide, 10wt%N, N- dimethyl-ethylenediamine and 6vol%
Ammonium polyacrylate, wherein ammonium polyacrylate is dissolved in deionized water, and adjusting pH value with ammonium hydroxide is 10.
S22. premixed liquid obtained by step S21 is added in the resulting Sialon ceramics powder of step S1,10wt% is added after mixing
Y2O3With the Al of 7%wt%2O3As sintering aid, ball milling 6h obtains required injection molding slurry；
S23., injection molding slurry obtained by step S22 is added to the ammonium persulfate solution and 6wt% of 12wt% after froth in vacuum
Tetramethylethylenediamine, after being uniformly mixed inject polymorphic structure stirring-head mold, normal temperature cure molding after, in 80 DEG C of baking
It is dry in case, until quality no longer becomes；
S3. degreasing and sintering:
S31. under 0.1Mpa nitrogen atmosphere, with the heating rate of 1 DEG C/min to 900 DEG C of completion base substrate degreasings.
S32. degreasing idiosome in S31 is placed on nitrogen pressure is 2.1MPa, and temperature is 1600 DEG C, with heating rate for 10
DEG C/min, keep the temperature 1h；
S33. it is 8.0MPa that later idiosome will be handled in S32 step and be placed on nitrogen pressure, and temperature is 1600 DEG C, heating speed
Rate is 10 DEG C/min, keeps the temperature 1h.
Embodiment 3
A kind of process preparing Sialon ceramics friction welding (FW) stirring-head, comprising the following steps:
S1. Sialon ceramics powder is prepared: according to the molecular formula Si of Sialon ceramics4Al2O2N6It calculates and weighs weighing accordingly
Si3N4, AlN and Al2O3, add 4wt%Y2O3, gained mixing is subjected to ball milling, then the dry 7h in 80 DEG C of baking ovens, close
Envelope；
Wherein ball milling is further comprising the steps of:
S11. mixing, different size of corundum and dehydrated alcohol are fitted into agate jar according to mass ratio 1:1.5:2；
S12. the ball grinder installed sealing is put into ball milling 21h in planetary ball mill.
S2. gel casting forming:
S21. premixed liquid is configured: 16wt%N- hydroxymethyl acrylamide, 10wt%N, N- dimethyl-ethylenediamine and 6vol%
Ammonium polyacrylate, wherein ammonium polyacrylate is dissolved in deionized water, and adjusting pH value with ammonium hydroxide is 9.
S22. premixed liquid obtained by step S21 is added in the resulting Sialon ceramics powder of step S1, is added 9wt%'s after mixing
Y2O3With the Al of 6%wt%2O3As sintering aid, ball milling 5h obtains required injection molding slurry；
S23., injection molding slurry obtained by step S22 is added to the ammonium persulfate solution and 6wt% of 11wt% after froth in vacuum
Tetramethylethylenediamine, after being uniformly mixed inject polymorphic structure stirring-head mold, normal temperature cure molding after, in 60 DEG C of baking
Drying no longer becomes to quality in case；
S3. degreasing and sintering:
S31. under 0.06Mpa nitrogen atmosphere, with the heating rate of 1 DEG C/min to 900 DEG C of completion base substrate degreasings.
S32. by degreasing idiosome in S31 be placed on nitrogen pressure be 1.5MPa, temperature be 1850 DEG C, heating rate be 10 DEG C/
Min keeps the temperature 1h；
S33. it is 4MPa that later idiosome will be handled in S32 step and be placed on nitrogen pressure, and temperature is 1830 DEG C, heating rate
For 10 DEG C/min, 1h is kept the temperature.
Microstructure and performance characterization are carried out to gained Sialon pottery friction welding (FW) stirring-head any in 1~embodiment of embodiment 3
With test result is as follows:
1. the 2550 type XRD diffractometer of D/max using Rigaku Electric Co., Ltd stirs prepared Sialon ceramics
It mixes head material and carries out material phase analysis, XRD is as shown in Fig. 1.As shown in Figure 1, the object phase composition of prepared stirring-head is main
For α-Sai Long and β-Sai Long.
2. using the JSM-6360LV type electronic scanner microscope of Jeol Ltd. to prepared stirring-head
Microstructure is analyzed, and result is as shown in Fig. 2.As shown in Figure 2, all α-Sai Long crystal grain in sample surface layer, in coarse
Column crystal must, and in internal layer, there are elongated crystal whisker-shaped β-Sai Long crystal grain, α-Sai Long crystal grain also has in crystal whisker-shaped, but compares
Wanting for surface layer is tiny.
The performance test results and characterization:
Prepared by gained stirring-head to 1~embodiment of embodiment 3 and carries out performance detection, specifically: being surveyed using Archimedes method
The density of material is measured, each data are at least surveyed three samples and are averaged.It is produced using Laizhou Huayi Testing Instrument Co., Ltd.
HV-10A Vickers, measure Vickers hardness, load 1kg, load 10s, test five points, be averaged.Sample resists
Bending strength test process is carried out referring to " engineering ceramics bending strength test method " (GB6569-86), in CSS-44100 electronics
It is measured on universal testing machine using three-point bending method.When bending strength is tested, specimen size is 4mm × 3mm × 36mm (width x thickness
× long), span 30mm, loading speed 0.5mm/min.The polishing of sample tension face, and require chamfering (45 °).Using
Vicker indentation method measures the fracture toughness of material, the HV-10A Vickers that impression is produced by Laizhou Huayi Testing Instrument Co., Ltd.
Hardometer generates, loading speed 0.5mm/min, load 10kg, load time 10s.Specific testing result is as shown in table 1.
1 stirring-head main performance index of table
| Embodiment | Density (g/cm3) | Vickers hardness (HV) | Bending strength (Mpa) | Fracture toughness (MPam1/2) |
| Embodiment 1 | 3.210 | 1538 | 736 | 7.268 |
| Embodiment 2 | 3.206 | 1546 | 763 | 7.198 |
| Embodiment 3 | 3.205 | 1525 | 714 | 7.464 |
Claims (9)
1. a kind of process for preparing Sialon ceramics friction welding (FW) stirring-head, which comprises the following steps:
S1. Sialon ceramics powder is prepared: according to the molecular formula Si of Sialon ceramics4Al2O2N6It calculates and weighs and weigh corresponding Si3N4、
AlN and Al2O3, Y is added2O3After obtain mixing, by gained mixing carry out ball milling, be then dried, seal；
S2. gel casting forming:
S21. premixed liquid is configured, the premixed liquid includes N hydroxymethyl acrylamide, N, N- dimethyl-ethylenediamine and polyacrylic acid
Ammonium, the ammonium polyacrylate are dissolved in deionized water, and adjusting pH value with ammonium hydroxide is 9~10；
S22. step S21 premixed liquid is added in the resulting Sialon ceramics powder of step S1, carries out ball milling, obtain required injection molding slurry
Material；
S23. by injection molding slurry obtained by step S22 after froth in vacuum, ammonium persulfate solution and tetramethylethylenediamine, stirring is added
Polymorphic structure stirring-head mold is injected after mixing to be dried after normal temperature cure molding；
S3. degreasing and sintering: green body is made in S2 and is put into nitrogen atmosphere stove progress temperature programming, degreasing is first completed, then uses
Two-step method molding, obtains the Sialon ceramics friction welding (FW) stirring-head；The degreasing refers in 0.05~0.1Mpa nitrogen gas
Under atmosphere, with the heating rate of 1 DEG C/min to 800~900 DEG C of completion degreasings；The two-step method refers to that the first step puts green compact
Setting in nitrogen pressure is 0.1~2.1MPa, and 1150 DEG C~1850 DEG C of temperature, heating rate is 10 DEG C/min, keeps the temperature 1 hour, second
It is 2.1~8.0MPa that step, which is placed on nitrogen pressure, and 1400 DEG C~1830 DEG C of temperature, heating rate is 10 DEG C/min, keeps the temperature 1 hour.
2. preparing the process of Sialon ceramics friction welding (FW) stirring-head according to claim 1, which is characterized in that step S1 institute
Stating drying process is dry 6~10h in 80 DEG C of baking ovens.
3. preparing the process of Sialon ceramics friction welding (FW) stirring-head according to claim 1, which is characterized in that step S1 institute
State Y2O3For 3~6wt%.
4. preparing the process of Sialon ceramics friction welding (FW) stirring-head according to claim 1, which is characterized in that step S1 institute
It is further comprising the steps of to state ball milling:
S11. mixing, mill ball and ball-milling medium are fitted into ball grinder according to mass ratio 1:1.5:2；The mill ball is selected not
With the corundum of size, the ball-milling medium selects dehydrated alcohol, and the ball grinder selects agate jar；
S12. the ball grinder installed sealing is put into ball milling 20 in planetary ball mill~for 24 hours.
5. preparing the process of Sialon ceramics friction welding (FW) stirring-head according to claim 1, which is characterized in that step S21
The N hydroxymethyl acrylamide is 15~20wt%, and the N, N- dimethyl-ethylenediamine is 9~10wt%, the polyacrylic acid
Ammonium is 5~6vol%.
6. preparing the process of Sialon ceramics friction welding (FW) stirring-head according to claim 1, which is characterized in that step S22
The ball milling further includes the Y that 8~10wt% is added in mixed liquor2O3With the Al of 5~7wt%2O3As sintering aid, ball milling
Time is 4~6h.
7. preparing the process of Sialon ceramics friction welding (FW) stirring-head according to claim 1, which is characterized in that step S23
The ammonium persulfate solution is 10~12wt%, and the tetramethylethylenediamine is 5~6wt%.
8. preparing the process of Sialon ceramics friction welding (FW) stirring-head according to claim 1, which is characterized in that step S23
The drying process is in 50~80 DEG C of baking oven, and drying no longer changes to quality.
9. according to claim 1 to the Sialon ceramics friction welding (FW) stirring-head that process described in 8 any one is prepared.
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| CN102807373A (en) * | 2012-09-14 | 2012-12-05 | 哈尔滨工业大学 | Method for preparing porous beta-SiAlON ceramic |
| CN103406973A (en) * | 2013-07-25 | 2013-11-27 | 中南大学 | Formation technology for preparation of porous or compact material with gel-casting of alcohol-water basic material slurry |
| CN103613402A (en) * | 2013-12-04 | 2014-03-05 | 天津大学 | O-Sialon porous material prepared by gel-casting and preparation method thereof |
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| CN102807373A (en) * | 2012-09-14 | 2012-12-05 | 哈尔滨工业大学 | Method for preparing porous beta-SiAlON ceramic |
| CN103406973A (en) * | 2013-07-25 | 2013-11-27 | 中南大学 | Formation technology for preparation of porous or compact material with gel-casting of alcohol-water basic material slurry |
| CN103613402A (en) * | 2013-12-04 | 2014-03-05 | 天津大学 | O-Sialon porous material prepared by gel-casting and preparation method thereof |
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