CN102337419B - Method for preparing pore structure parameter controlled porous TiNi shape memory alloy - Google Patents
Method for preparing pore structure parameter controlled porous TiNi shape memory alloy Download PDFInfo
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- 239000011148 porous material Substances 0.000 title claims abstract description 102
- 229910010380 TiNi Inorganic materials 0.000 title claims abstract description 100
- 229910001285 shape-memory alloy Inorganic materials 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title abstract description 14
- 239000000956 alloy Substances 0.000 claims abstract description 57
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- 238000002360 preparation method Methods 0.000 claims abstract description 42
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 30
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 19
- 239000010439 graphite Substances 0.000 claims abstract description 19
- 239000011780 sodium chloride Substances 0.000 claims abstract description 15
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 239000002184 metal Substances 0.000 claims abstract description 6
- 229910052582 BN Inorganic materials 0.000 claims abstract description 5
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 46
- 238000007731 hot pressing Methods 0.000 claims description 19
- 239000011812 mixed powder Substances 0.000 claims description 19
- 238000009413 insulation Methods 0.000 claims description 18
- 238000010792 warming Methods 0.000 claims description 18
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- 239000000758 substrate Substances 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
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Abstract
The invention discloses a method for preparing a pore structure parameter controlled porous TiNi shape memory alloy. The method comprises the following steps of: preparing TiNi alloy powder through atomization of high purity N2 gas; preparing NaCl powder with different granularities; uniformly mixing the TiNi alloy powder and the NaCl powder; isolating a graphite mould by using a boron nitride coating; performing vacuum hot pressed sintering; performing high temperature sintering and evaporative desalination; and performing solid solution quenching. The key of the method capable of preparing closed pore materials is that: vacuum hot pressed forming and evaporative desalination are adopted, a pore-forming agent is ensured to be completely removed in a vapor form, and the corrosion of residual pore-forming agent to a matrix metal is eliminated; the porosity, the pore size, the shape, distribution and other structure parameters of the prepared pore structure parameter controlled porous TiNi shape memory alloy can be accurately controlled through a preparation process; and the pore structure parameter controlled porous TiNi shape memory alloy has the characteristics of uniform pore distribution, high compression strength, high damping performance, no carburization and the like, is suitable for industrial production and can be expected to be applied in multiple aspects such as medical science, aerospace industry, electronics, machinery, energy, daily life and the like.
Description
Technical field
The present invention relates to the preparation method of the controlled porous TiNi shape memory alloy of a kind of pore structure parameter.Belong to the multi-porous alloy material preparing technical field.
Background technology:
Shape memory effect is to find first in the Au-Cd alloy nineteen fifty-one.Early sixties, Buehler and Arbuzora observe the shape memory effect with practical value in the TiNi that waits atomic ratio and Cu base alloy.The people such as Civjan studied the shape memory effect of having used the TiNi shape memory alloy first in 1975, and they have designed a large amount of TiNi shape memory alloy apparatuses, and utilize the shape memory effect of TiNi B alloy wire to carry out orthodontia.These achievements in research are for the shape memory alloy especially research and development of TiNi shape memory alloy has been opened new page.
The TiNi shape memory alloy has obtained increasingly extensive application in fields such as medical science, space flight and aviation industry, electronics, machinery, the energy and daily lifes.Its product comprises the mechanical manipulator of bootstrapping various medical supports, spinal column correction bar, wire for correcting shape of tooth, satellite antenna, shape-memory alloy wire driving etc.The TiNi shape memory alloy has been widely used in department of eye, Stomatological Department, orthopedic section, orthopaedics, Interventional Radiography and gynaecology etc. at present at medical field.The patent of relevant shape memory alloy surpasses 10,000 in the world, and with the speed increase of annual hundreds of item, wherein many about curable product.China's application of TiNi shape memory alloy in medical field is in advanced international standard, obtained the multinomial breakthrough achievement in research that has.
The research of porous TiNi shape memory alloy probably starts from 1969, until just begin the latter stage seventies its crystalline structure, phase composite, mechanical property and shape memory parameter etc. are studied comparatively widely.Porous TiNi shape memory alloy is mainly used in biomedical sector at present, and it obtains significant progress in Russia, Ukraine.China, Canada, Japan, Korea S etc. are also strengthening research and the application of this respect.
The preparation technology of porous TiNi shape memory alloy mainly contains following several: self propagating high temperature synthesis method (SHS), non-tight hot isostatic pressing method (CF-HIP), spark-plasma sintering method (SPS) etc.Yet these methods all can't accurately be controlled pore structure (comprising pore dimension, shape, orientation, distribution etc.) parameter.In porous material, pore structure plays very important effect to the overall performance of material, for the success ratio that improves sample preparation, can accurately control and optimize material property pore structure parameter, and necessary exploration and develop new preparation technology.
Summary of the invention:
Purpose of the present invention just provides the preparation method of the controlled porous TiNi shape memory alloy of a kind of pore structure parameter.
The preparation method of the porous TiNi shape memory alloy that a kind of pore structure parameter of the present invention is controlled comprises the steps:
The first step: batch mixing
Get varigrained pore-forming material powder and granularity by porosity, pore shape, the pore dimension of design and place mixer less than the TiNi alloy powder of 75 μ m, add the raw spirit that accounts for described pore-forming material powder and TiNi alloy powder gross weight 0.5wt%, mixed 20～40 minutes, and obtained mixed powder;
Second step: in warm pressure sintering and high-temperature pressure sintering
The first step gained mixed powder is packed in the graphite mo(u)ld, is 10 in vacuum tightness
-3-10
-4Be warming up in the environment of Pa 180～200 ℃ the insulation 0.5～1h, remove alcohol, subsequently the mixed powder in the graphite mo(u)ld is applied the hot pressing pressure of 25～30Mpa, and be warming up to 760～780 ℃ carry out in warm pressure sintering, in warm pressure sintering time be 2.5～3h; Complete discharge hot pressing pressure continues to be warming up to 1100～1150 ℃, and furnace cooling behind insulation 2.5～3h makes the complete evaporative removal of pore-forming material, obtains the porous material billet; Namely make the controlled porous TiNi shape memory alloy of pore structure parameter.
Among the preparation method of the porous TiNi shape memory alloy that a kind of pore structure parameter of the present invention is controlled, apply the analytical pure boron nitride cream with the alcohol allotment on the described graphite mo(u)ld inwall, and at 200 degree oven dry, coat thickness 0.3-05mm.
Among the preparation method of the porous TiNi shape memory alloy that a kind of pore structure parameter of the present invention is controlled, the porous material billet that second step is obtained is heated to 880～900 ℃ of insulation shrends after 8～10 minutes,, obtain the controlled porous TiNi shape memory alloy of high strength pore structure parameter.
Among the preparation method of the porous TiNi shape memory alloy that a kind of pore structure parameter of the present invention is controlled, described TiNi alloy powder be by after the Ti that waits atomic ratio, the fusing of Ni metal batching with melt overheat to 1430～1450 ℃, with the high-purity N of pressure greater than 3MPa
2Gas-atomized powder and obtaining.
Among the preparation method of the porous TiNi shape memory alloy that a kind of pore structure parameter of the present invention is controlled, described pore-forming material adopts analytically pure pore-forming material powder to dissolve in the distilled water and reaches capacity, obtain the recrystallize particle with post-drying to constant weight, after the recrystallize grain breakage, screening is chosen and obtained granularity is 100-800 μ m pore-forming material powder; Described pore-forming material is selected from the NaCl powder.
Among the preparation method of the porous TiNi shape memory alloy that a kind of pore structure parameter of the present invention is controlled, the weight ratio of described TiNi alloy powder and described pore-forming material powder is (1.5～7): 1.
Among the preparation method of the porous TiNi shape memory alloy that a kind of pore structure parameter of the present invention is controlled, described mixer is " V " type mixer.
Among the preparation method of the porous TiNi shape memory alloy that a kind of pore structure parameter of the present invention is controlled, described in warm pressure sintering in vacuum hotpressing machine, carry out.
The controlled porous TiNi shape memory alloy of pore structure parameter of preparation method's preparation of the porous TiNi shape memory alloy that a kind of pore structure parameter of the present invention is controlled, be made of the perforate hole that distributes in the alloy substrate or closed pore hole, described perforate hole and closed pore hole are formed by the pore-forming material that is evenly distributed in the described alloy substrate; The porous alloy of described perforate hole, the volume percent of its hole and alloy substrate are 45%-85%, simultaneously, inevitably have a small amount of closed pore hole in alloy substrate; The porous alloy of described closed pore hole, the volume percent of its hole and alloy substrate are 15%-45%, at this moment, only have a small amount of perforate hole on the surface of alloy sample; The described perforate pore shape size that is distributed in the described alloy substrate is consistent with described pore-forming material geomery with closed pore pore shape size.
The present invention adopts the high-purity N greater than 3MPa owing to adopting above-mentioned processing method
2Aerosolization prepares the TiNi powdered alloy, and atomizing cup is evacuated to first 10
-2Then Pa is filled with high-purity N
2Gas is pressure-fired in the control atomizing cup, can prevent that the TiNi alloy is in the oxidation of droplet state surface in the atomizing; Adopting analytically pure pore-forming material powder to dissolve in the distilled water reaches capacity, obtain the recrystallize particle with post-drying to constant weight, after the recrystallize grain breakage, the pore-forming material powder that obtains different grain size, shape is chosen in screening, can control as required void shape, size; The size of pore-forming material will be obviously greater than TiNi powdered alloy size, mix after adopting the moistening pore-forming material powder of raw spirit and TiNi alloy powder, make powder form " wet-milling ", the TiNi powdered alloy that Relative Size is less in mixing process can evenly be adsorbed on the larger pore-forming material powder surface of Relative Size, avoid the direct contact between the pore-forming material in the vacuum hotpressing process, cause pore structure parameter uncontrollable; Adopt the analytical pure boron nitride powder to mix with alcohol, form thick colloid and also evenly be coated on the graphite mo(u)ld inwall, can prevent in the carbon infiltration TiNi sample in the graphite jig at high temperature, thereby guarantee the mechanical property of porous TiNi sample; Warm pressure sintering in below the pore-forming material fusing point 760～780 ℃ of employing, the TiNi powdered alloy is easily deformable, and pore-forming material does not melt, along with in the continuing of warm pressure sintering process, unfused pore-forming material powder can constantly flow under the effect of pressure, finally, the pore-forming material powder is uniformly distributed in the hot pressing billet, can effectively guarantee the homogeneity of hole; High-temperature vacuum sintering subsequently, pore-forming material melt at first fully, but its melt can't flow out in close-fitting graphite mo(u)ld, continuation rising along with temperature, the saturated vapor pressure of pore-forming material melt is soaring rapidly, reaches more than the 1000Pa in the time of 1100～1150 ℃, far above the vacuum tightness 10 of hot pressing furnace
-3-10
-4Pa, pore-forming material steam are drawn out of continuously until a refrigerating unit is installed in fully removal in the pumped vacuum systems of vacuum hotpressing machine, make the again crystallization of NaCl that exists with vapor form, so that reclaim, prevent that simultaneously diffusion pump is contaminated.Meanwhile, sintering temperature (1100～1150 ℃) is very near TiNi alloy melting point (1250 ℃), long-time sintering under sintering temperature, the diffusion of TiNi matrix fully, metal frame intensity further improves.Form porous TiNi shape memory alloy heat pressed compact ingot behind the furnace cooling; Adopt water quenching technology, make porous TiNi shape memory alloy at room temperature be organized as the martensite attitude, obtain high-intensity porous TiNi shape memory alloy.
In sum, the present invention adopts hot-forming and evaporative desalination, and can guarantee that pore-forming material removes fully with the form of steam, thereby eliminate remaining pore-forming material to the corrosive nature of matrix metal, be the key point that the method can prepare closed-cell materials; Not only porosity is controlled for the controlled porous TiNi shape memory alloy of pore structure parameter of the present invention's preparation, and the structural parameter such as pore dimension, shape, distribution all can be realized accurate control by its preparation technology; The preparation alloy also have intensity high, without characteristics such as carburizings.Be suitable for suitability for industrialized production.Be expected for all many-sides such as medical science, space flight and aviation industry, electronics, machinery, the energy and daily lifes.
Description of drawings:
Accompanying drawing 2 is the porous TiNi microstructure of the alloy figure of the embodiment of the invention 2 preparations, is shown as perforate among the figure; Porosity is 65%;
Accompanying drawing 3 (a) is the porous TiNi alloy scanning electron microscope picture of the embodiment of the invention 4 preparations, is shown as closed pore among the figure; Porosity is 35%;
Accompanying drawing 3 (b) is the porous TiNi alloy scanning electron microscope picture of the embodiment of the invention 3 preparations, is shown as closed pore among the figure; Porosity is 25%;
Accompanying drawing 4 is the porous TiNi alloy compression curve of the embodiment of the invention 3 preparations;
Embodiment:
The described TiNi alloy powder of using in the embodiment of the invention be by after the Ti that waits atomic ratio, the fusing of Ni metal batching with melt overheat to 1430～1450 ℃, with the high-purity N of pressure greater than 3MPa
2Gas-atomized powder and obtain granularity less than the powder of 75 μ m.Apply the analytical pure boron nitride cream with the alcohol allotment on the described graphite mo(u)ld inwall of using in the embodiment of the invention, and at 200 degree oven dry, coat thickness 0.3-0.5mm.Adopt " V " type mixer batch mixing in the embodiment of the invention.Warm pressure sintering carries out in vacuum hotpressing machine in the embodiment of the invention.
In the embodiment of the invention, the measuring method of closed-cell porosity is: measure respectively fine and close TiNi alloy density ρ with Archimedes's method
2, and the density p of the porous TiNi alloy sample of embodiment preparation
1, by formula P=(1-ρ
1/ ρ
2) * 100% calculates the overall porosity P of porous TiNi alloy sample.
In the embodiment of the invention, the measuring method of open-cell porosity is:
1, weighs up the quality m of the porous TiNi alloy sample of embodiment preparation
1, be the sample dry weight;
2, the porous TiNi alloy sample of embodiment preparation is immersed in the kerosene about 2h, and keep kerosene to be higher than sample 50mm.Sample is suspended in the kerosene liquid quality m of weighing sample in liquid with fine rule
3, be called the apparent mass of sample;
3, from kerosene, take out sample, squeeze with plastic paper and wipe the kerosene that adheres to except specimen surface, rapidly the aerial quality m of weighing sample
2, be full water heavy;
4, according to formula
Calculate the open-cell porosity of porous TiNi alloy sample.M in the formula
2-m
1For being filled with the quality of kerosene, m in the perforate hole
2-m
3Be the buoyancy that saturated sample is subject in kerosene, namely arrange the quality of kerosene.Open-cell porosity is the volume of all perforate holes in the sample ratio long-pending with population of samples.
In the embodiment of the invention, closed-cell porosity deducts open-cell porosity by overall porosity and obtains.
Embodiment 1:
The first step: batch mixing
Getting granularity is to place mixer fully mix at 2: 1 less than the TiNi alloy powder of 75 μ m and the NaCl of 355-800 μ m granularity in mass ratio, add the raw spirit that accounts for described pore-forming material powder and TiNi alloy powder gross weight 0.5wt%, mixed 20 minutes, and obtained mixed powder;
Second step: in warm pressure sintering and high-temperature vacuum sintering
The first step gained mixed powder is packed in the graphite mo(u)ld, is 10 in vacuum tightness
-3-10
-4Be warming up in the environment of Pa 180 ℃ the insulation 0.5h, remove alcohol, subsequently the mixed powder in the graphite mo(u)ld is applied the hot pressing pressure of 25Mpa, and be warming up to 750 ℃ carry out in warm pressure sintering, in warm pressure sintering time be 2.5h; Complete discharge hot pressing pressure continues to be warming up to 1100 ℃, and furnace cooling behind the insulation 2.5h makes the complete evaporative removal of pore-forming material, obtains the porous material billet of Φ 35mm; Sample quality is determined desalination fully as no before and after measuring hot pressed sintering and high-temperature vacuum sintering, then, described porous material billet is heated to 880 ℃ of insulation shrends after 8～10 minutes, obtains the controlled porous TiNi shape memory alloy of pore structure parameter.
The porous material billet exterior appearance of the present embodiment preparation is seen Fig. 1, and the present embodiment porous TiNi shape memory alloy pore structure and performance data are as shown in table 1.
Table 1 embodiment 1 porous TiNi shape memory alloy pore structure and performance data
Embodiment 2: the first step: batch mixing
Getting granularity is to place mixer fully mix at 3: 2 less than the TiNi alloy powder of 75 μ m and the NaCl of 100-355 μ m granularity in mass ratio, add the raw spirit that accounts for described pore-forming material powder and TiNi alloy powder gross weight 0.5wt%, mixed 30 minutes, and obtained mixed powder;
Second step: in warm pressure sintering and high-temperature vacuum sintering
The first step gained mixed powder is packed in the graphite mo(u)ld, is 10 in vacuum tightness
-3-10
-4Be warming up in the environment of Pa 190 ℃ the insulation 0.8h, remove alcohol, subsequently the mixed powder in the graphite mo(u)ld is applied the hot pressing pressure of 28Mpa, and be warming up to 770 ℃ carry out in warm pressure sintering, in warm pressure sintering time be 2.8h; Complete discharge hot pressing pressure continues to be warming up to 1130 ℃, and furnace cooling behind the insulation 2.8h makes the complete evaporative removal of pore-forming material, obtains the porous material billet of Φ 70mm; Sample quality is determined desalination fully as no before and after measuring hot pressed sintering and high-temperature vacuum sintering, then, described porous material billet is heated to 890 ℃ of insulation shrends after 8～10 minutes, obtains the controlled porous TiNi shape memory alloy of pore structure parameter.
The pore appearance of the porous material of the present embodiment preparation is seen Fig. 2, even pore distribution, and the pore shape size is consistent with used NaCl geomery, and the present embodiment porous TiNi shape memory alloy pore structure and performance data are as shown in table 2.
Table 2 embodiment 2 porous TiNi shape memory alloy pore structure and performance datas
| Porosity | Pore dimension | Perforate/closed pore | Pore shape | Ultimate compression strength | The desalination ratio | Have or not carburizing |
| 65％ | 100-355μm | Perforate | Square | 125Mpa | 100％ | Nothing |
Embodiment 3: the first step: batch mixing
Getting granularity is to place mixer fully mix at 5: 1 less than the TiNi alloy powder of 75 μ m and the NaCl of 100-355 μ m granularity in mass ratio, add the raw spirit that accounts for described pore-forming material powder and TiNi alloy powder gross weight 0.5wt%, mixed 40 minutes, and obtained mixed powder;
Second step: in warm pressure sintering and high-temperature vacuum sintering
The first step gained mixed powder is packed in the graphite mo(u)ld, is 10 in vacuum tightness
-3-10
-4Be warming up in the environment of Pa 200 ℃ the insulation 1h, remove alcohol, subsequently the mixed powder in the graphite mo(u)ld is applied the hot pressing pressure of 30Mpa, and be warming up to 780 ℃ carry out in warm pressure sintering, in warm pressure sintering time be 3h; Complete discharge hot pressing pressure continues to be warming up to 1150 ℃, and furnace cooling behind the insulation 3h makes the complete evaporative removal of pore-forming material, obtains the porous material billet of Φ 35mm; Sample quality is determined desalination fully as no before and after measuring hot pressed sintering and high-temperature vacuum sintering, then, described porous material billet is heated to 900 ℃ of insulation shrends after 8～10 minutes, obtains the controlled porous TiNi shape memory alloy of pore structure parameter.
The exterior appearance of the sample of the present embodiment preparation is seen Fig. 3 (a).The sample alloy hole of the present embodiment preparation is closed pore, is closely spherical, and is evenly distributed.The present embodiment porous TiNi shape memory alloy pore structure and performance data are as shown in table 3.
Table 3 embodiment 4 porous TiNi shape memory alloy pore structure and performance datas
| Porosity | Pore dimension | Perforate/closed pore | Pore shape | Ultimate compression strength | The desalination ratio | Have or not carburizing |
| 35％ | 100-355μm | Closed pore | Subsphaeroidal | 583Mpa | 100％ | Nothing |
Embodiment 4:
The first step: batch mixing
Getting granularity is to place mixer fully mix at 7: 1 less than the TiNi alloy powder of 75 μ m and the NaCl of 100-355 μ m granularity in mass ratio, add the raw spirit that accounts for described pore-forming material powder and TiNi alloy powder gross weight 0.5wt%, mixed 40 minutes, and obtained mixed powder;
Second step: in warm pressure sintering and high-temperature vacuum sintering
The first step gained mixed powder is packed in the graphite mo(u)ld, is 10 in vacuum tightness
-3-10
-4Be warming up in the environment of Pa 200 ℃ the insulation 1h, remove alcohol, subsequently the mixed powder in the graphite mo(u)ld is applied the hot pressing pressure of 30Mpa, and be warming up to 780 ℃ carry out in warm pressure sintering, in warm pressure sintering time be 3h; Complete discharge hot pressing pressure continues to be warming up to 1150 ℃, and furnace cooling behind the insulation 3h makes the complete evaporative removal of pore-forming material, obtains the porous material billet of Φ 35mm; Sample quality is determined desalination fully as no before and after measuring hot pressed sintering and high-temperature vacuum sintering, then, described porous material billet is heated to 900 ℃ of insulation shrends after 8～10 minutes, obtains the controlled porous TiNi shape memory alloy of pore structure parameter.
The compression curve of the sample of the present embodiment preparation is seen Fig. 3.Fig. 3 (b) is the alloy scanning electron microscope picture of the present embodiment preparation, shown in Fig. 3 (b), hole is closely spherical and is evenly distributed, and the pore shape size is consistent with used NaCl geomery, and the present embodiment porous TiNi shape memory alloy pore structure and performance data are as shown in table 4.With respect to used NaCl powder, formed hole has obvious contraction spherodization, this be since when TiNi powder volume mark in TiNi and the NaCl mixed powder greater than 50% the time, the TiNi powder just wraps up the NaCl particle wherein fully, behind the NaCl evaporative removal, form independently blind hole gap, during high temperature sintering, the TiNi matrix is because the continuous densification of diffusion impels the square storage pore of script constantly to shrink nodularization.
Table 4 embodiment 3 porous TiNi shape memory alloy pore structure and performance datas
| Porosity | Pore dimension | Perforate/closed pore | Pore shape | Ultimate compression strength | The desalination ratio | Have or not carburizing |
| 25％ | 100-355μm | Closed pore | Subsphaeroidal | 750Mpa | 100％ | Nothing |
Claims (7)
1. the preparation method of the controlled porous TiNi shape memory alloy of a pore structure parameter comprises the steps:
The first step: batch mixing
Get varigrained pore-forming material powder and granularity by porosity, pore shape, the pore dimension of design and place mixer less than the TiNi alloy powder of 75 μ m, add the raw spirit that accounts for described pore-forming material powder and TiNi alloy powder gross weight 0.5wt%, mixed 20～40 minutes, and obtained mixed powder;
Second step: in warm pressure sintering and high-temperature pressure sintering
The first step gained mixed powder is packed in the graphite mo(u)ld, is 10 in vacuum tightness
-3-10
-4Be warming up in the environment of Pa 180～200 ℃ the insulation 0.5～1h, remove alcohol, subsequently the mixed powder in the graphite mo(u)ld is applied the pressure of 25～30MPa, and be warming up to 760～780 ℃ carry out in warm pressure sintering, in warm pressure sintering time be 2.5～3h; Complete discharge hot pressing pressure continues to be warming up to 1100～1150 ℃, and furnace cooling behind insulation 2.5～3h makes the complete evaporative removal of pore-forming material, obtains the porous material billet; Namely make the controlled porous TiNi shape memory alloy of pore structure parameter; Apply the analytical pure boron nitride cream with the alcohol allotment on the described graphite mo(u)ld inwall, and at 200 degree oven dry, coat thickness 0.3-0.5mm; The controlled porous TiNi shape memory alloy of pore structure parameter of preparation is made of the perforate hole that distributes in the alloy substrate or closed pore hole, and described perforate hole and closed pore hole are formed by the pore-forming material that is evenly distributed in the described alloy substrate; The porous alloy of described perforate hole, the volume percent of its hole and alloy substrate are 45%-85%; The porous alloy of described closed pore hole, the volume percent of its hole and alloy substrate are 15%-45%; Described perforate pore shape size is consistent with described pore-forming material geomery with closed pore pore shape size.
2. the preparation method of the controlled porous TiNi shape memory alloy of a kind of pore structure parameter according to claim 1, it is characterized in that: the porous material billet that second step is obtained is heated to 880～900 ℃ of insulation shrends after 8～10 minutes, obtains the controlled porous TiNi shape memory alloy of high strength pore structure parameter.
3. the preparation method of the controlled porous TiNi shape memory alloy of a kind of pore structure parameter according to claim 2, it is characterized in that: described TiNi alloy powder be by after the Ti that waits atomic ratio, the fusing of Ni metal batching with melt overheat to 1430～1450 ℃, with the high-purity N of pressure greater than 3MPa
2Gas-atomized powder and obtaining.
4. the preparation method of the controlled porous TiNi shape memory alloy of a kind of pore structure parameter according to claim 3, it is characterized in that: described pore-forming material adopts analytically pure pore-forming material powder to dissolve in the distilled water and reaches capacity, obtain the recrystallize particle with post-drying to constant weight, after the recrystallize grain breakage, screening is chosen and obtained granularity is 100-800 μ m pore-forming material powder; Described pore-forming material is selected from the NaCl powder.
5. the preparation method of the controlled porous TiNi shape memory alloy of a kind of pore structure parameter according to claim 1, it is characterized in that: the weight ratio of described TiNi alloy powder and described pore-forming material powder is (1.5～7): 1.
6. the preparation method of the controlled porous TiNi shape memory alloy of the described a kind of pore structure parameter of any one according to claim 1-5, it is characterized in that: described mixer is " V " type mixer.
7. the preparation method of the controlled porous TiNi shape memory alloy of the described a kind of pore structure parameter of any one according to claim 1-5, it is characterized in that: warm pressure sintering carries out in vacuum hotpressing machine in described.
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| CN107043867B (en) * | 2017-01-09 | 2019-02-22 | 河北工业大学 | A kind of preparation method of porous copper-based shape memory alloy |
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| CN112264622B (en) * | 2020-11-02 | 2023-06-13 | 昆明理工大学 | TiH-based 2 Method for preparing porous Ti-Ni alloy by powder |
| CN115386755B (en) * | 2022-06-21 | 2023-07-18 | 中南大学 | Preparation method of low-cost element mixed NiTi shape memory alloy through high-temperature homogenization treatment |
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