CN109351801B - A kind of preparation method with the Nitinol helical spring for playing fuel factor - Google Patents
A kind of preparation method with the Nitinol helical spring for playing fuel factor Download PDFInfo
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- CN109351801B CN109351801B CN201811285477.3A CN201811285477A CN109351801B CN 109351801 B CN109351801 B CN 109351801B CN 201811285477 A CN201811285477 A CN 201811285477A CN 109351801 B CN109351801 B CN 109351801B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F35/00—Making springs from wire
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
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Abstract
A kind of preparation method with the Nitinol helical spring for playing fuel factor, belongs to the technical field of spring.The present invention is aiming at the problem that the current Nitinol spring technology of preparing lacked with high-elastic hot property.The method of the present invention: one, Nitinol ingot casting is hot extruded into bar；Two, then it is drawn into fiber；Three, fibre compact is wrapped on the plug of stainless steel material, is sealed in quartz ampoule；Four, 1000 DEG C -1120 DEG C are then heated to, 2h-5h is kept the temperature, fast cooling takes out, and at 450 DEG C -500 DEG C, keeps the temperature 0.5h-1h, and it is air-cooled, plug is taken out, spring body is obtained；Five, load is applied to spring body, then is unloaded to zero stress；Six, repeat step 5 operates at least 29 times to get the Nitinol helical spring is arrived.Spring of the present invention can be used as structural and functional properties combined element, be widely used in the engineering fields such as temperature-sensitive driving element, damping shock absorption, energy-accumulation material, bio-medical.
Description
Technical field
The invention belongs to the technical fields of spring；More particularly to a kind of Nitinol helical spring with bullet fuel factor
Preparation method.
Background technique
Current refrigeration equipment is widely used gas compression mode and freezes.And solid coolant is using material in stress field, magnetic
Or the outer field actions such as electric field under fuel factor freeze.Compared with traditional gas Compressing Refrigeration, solid coolant has
Efficient energy conversion is high, device volume is small and advantages of environment protection.Using marmem in fast application or removal
When external force, magnetic field or electric field, highly effective refrigeration equipment can be made in the adiabatic temperature variation that Martensitic Transformation generates.NiTi
Alloy has many advantages, such as that good mechanical performance, performance are stable, good with environment (including biological tissue) compatibility, it has also become application is most
One of extensive memorial alloy.In addition when Nitinol is applied to refrigerating field, Entropy Changes is big, operating temperature range is wide and circulation is steady
It is qualitative good, it is one of solid coolant material of current focus development, it is in widespread attention.
The bullet hot property of Nitinol refers to that alloy temperature reduces during fast discharging, generates refrigeration to ambient enviroment
The ability of effect.Temperature reduces amplitude, cryogenic temperature window, refrigerating capacity stability and material and circulatory mediator heat exchange energy
Power etc. is that optimization plays hot property problem in need of consideration, more from the research of the microscopic structure and phase transition process optimization method of material,
But the work in terms of structure optimization is also seldom.For example in order to improve material and circulatory mediator exchange capability of heat, need to reduce material ruler
It is very little, for example it is prepared into particle or silk material, but particle and silk material are difficult to be directly used in refrigeration equipment.
Summary of the invention
The present invention provides one aiming at the problem that the current Nitinol spring technology of preparing lacked with high-elastic hot property
Kind has the preparation method for the Nitinol helical spring for playing fuel factor.
In order to solve the above technical problems, a kind of preparation side with the Nitinol helical spring for playing fuel factor in the present invention
Method carries out in the steps below:
Step 1: Nitinol ingot casting is hot extruded into bar；
Step 2: then by bar drawing at fiber；
Step 3: by step 2, treated that fibre compact is wrapped in ceramic core rod, is sealed in quartz ampoule；
Step 4: being then heated to 1000 DEG C -1120 DEG C, 2h-5h is kept the temperature, fast cooling takes out plug and is wrapped in core
Fiber on stick keeps the temperature 0.5h-1h at 450 DEG C -500 DEG C, air-cooled, and spring is taken out from plug and obtains spring body；
Step 5: applying load to spring body, then it is unloaded to zero stress；
Step 6: repetition step 5 operates at least 29 times to get the Nitinol helical spring is arrived.
It further limits, Nitinol ingot casting described in step 1 is using pure nickel and pure titanium as raw material, using electric arc melting
Diameter is made as the cylindrical ingot casting of 30mm-100mm, length 60mm-100mm in vacuum suction casting technique, and nickel content is in ingot casting
50%-50.5% (atomic percent).
It further limits, hot extrusion described in step 1 is completed by following step:
1., after ingot casting surface alcohol washes step is dried, be then coated with the glass lubricant of 0.5mm~1mm thickness,
The glass lubricant is 900 DEG C -1100 DEG C and granularity < 5 μm of glassy solids material powder using temperature, is put into after coating
It is dried 0.5 hour in 140 DEG C -150 DEG C of ventilation drying box；
Step is 2., by graphite powder and lubricating oil, 1:1 is stirred evenly by volume, be then coated with squeeze sleeve interior surface and
Extrusion die prod cast inner surface places annulus resistance furnace squeezing outside sleeve, will squeeze sleeve, extrusion die prod cast is heated to
0.5~1h is kept the temperature after 500-600 DEG C；
Step is 3., by step, 1. treated that ingot casting is put into resistance furnace preheats, with 20~30 DEG C/min of heating speed
Rate is heated to 1050~1150 DEG C, keeps the temperature 0.5~1h；
Step 4., 3. step is preheated after ingot casting be put into squeeze sleeve in by extrusion ratio be (9~16): 1 and squeeze speed
Rate is that 15~25mm/s carries out hot extrusion, and ingot casting is fetched into completion extrusion time from resistance furnace and is less than 10s, then is beaten with sand paper
Mill (glass lubricant on removal surface), obtains the bar of the smooth flawless in surface.Nitinol ingot casting is being processed into alloy
In rod motion, the high-temperature process before extruding promotes alloying component to homogenize, and can get tiny equiaxed structure after extruding, improves conjunction
The plasticity and toughness of gold, guarantee not easy to break in subsequent room temperature drawing process；By coating high temperature in ingot casting outer surface
Glass lubricant coats graphite finish in mould inner surface, reduces material and the frictional force of mold in extrusion process, both protected
The smooth surface state of bar has been demonstrate,proved, and has reduced the damage of mold, has improved die life, and at low cost.
It further limits, diameter of rod described in step 1 is 5.2mm-15mm.
It further limits, in step 2, when 5.2≤d of diameter < 15mm of bar, drawing speed is controlled in 2-5mm/s；
When the diameter of bar is 2.7≤d < 5.2mm, drawing speed is controlled in 5-10mm/s；The diameter of bar is 0.05≤d < 2.7mm
When, drawing speed is controlled in 10-20mm/s；Reach 40%~50%, 90%~100%, 140% to cumulative deformation~
150%, 190%~200%, 240%~250%, 290%~300%, 350%~360%, 450%~460%, 530%
~540%, 610%~620%, 680%~690%, 760%~770%, 820%~830%, 900%~910%,
It is air-cooled after annealing when 950%~960%, 1030%~1040 or 1110%~1120%；Wherein, the annealing temperature is
450-550 DEG C, annealing time 10-30min.The drawing is that rod end is worked into slightly smaller than drawing mould hole size
It is passed through afterwards from inner hole, diameter of rod is consistent with the internal diameter of drawing mould after bar all to be drawn out to mold, using series of inner diameter
Major diameter bar can be prepared into small diameter fibers by ever-reduced drawing mould.
It further limits, the diameter of fiber described in step 2 is 0.05-0.35mm.
It further limits, diameter Ф=0.5mm-5.0mm of plug described in step 3, plug is for winding Nitinol
Fiber, fiber is close in plug axial alignment in winding process.It is straight with fiber that screw pitch can be obtained using a fibre compact winding
The consistent spring of diameter, is closely wound using two and plurality of fibers, is then separated the corresponding spring of each fiber, can be obtained
To the spring of different screw pitch, fiber both ends are fixed on ceramic rod after winding.
It further limits, fast cooling is that one end of quartz ampoule is put into room rapidly after taking out quartz ampoule in step 4
It is caught broken in water under temperature and by its bottom, promotes water to immediately wick into quartz ampoule under vacuum, make to be wrapped in plug in pipe
Temperature of the fiber fast cooling on surface to room temperature water.
1000 DEG C -1120 DEG C of step 4 Nitinol fiber, after keeping the temperature 2h-5h high-temperature process, grain growth is arrived and fiber
Diameter is identical, is arranged in ring grain form along fibre axis direction.This ring crystal grain is conducive to reduce phase transformation resistance, phase transformation
Lag increases super-elasticity platform dependent variable.It 450 DEG C -500 DEG C, after heat preservation 0.5h-1h low temperature aging processing, generates dispersed and tiny
Precipitated phase, improve the yield strength of fiber, super-elasticity cyclical stability and play hot stabilizability.
It further limits, load is 30MPa-70MPa in step 5, and loading speed 0.6MPa/s-1.0MPa/s makes
Spring elongation reaches 120%-300%, then spring body is unloaded to zero stress with loading speed identical rate, super by this
After elastic training processing, spring body has better super-elasticity cyclical stability and plays hot stabilizability.
It further limits, operation 29~49 times of step 5 is repeated in step 6.
The room temperature drawing of the method for the present invention elder generation prepares Nitinol micrometer fibers, most laggard then by fiber wound into spring
Row high temperature crystal grain is grown up heat treatment and low temperature aging heat treatment and super-elasticity training, and obtaining has the good NiTi for playing hot property
Spring.Compared with Nitinol block materials, during NiTi spring bullet refrigeration heat, the applied stress needed is small, the temperature that generates
Degree variation is big；With very big specific surface area, be conducive to heat transmission；Shearing force suffered by the course of work is easier to induce geneva
Body phase transformation；In addition, spring of the present invention can be used as structural and functional properties combined element, it is widely used in temperature-sensitive driving element, damping
The engineering fields such as damping, energy-accumulation material, bio-medical.
The present invention proposes the silk material of Nitinol micron diameter being prepared into spring, the specific surface area that has both kept silk material big,
It may be directly applied to refrigeration equipment again.
For the method for the present invention by micrometer fibers wound into spring, coiling power is small, manufacturing cost is cheap, is suitable for batch production；
The micron fiber diameter that the present invention obtains is small, surface-to-volume ratio is big, is conducive to and surrounding medium heat exchange；
The fiber crystal grain in spring that the method for the present invention obtains is in Bamboo-shaped, and crystal boundary is small to the restriction of martensitic traoformation, phase
It is small to become lag；
The present invention can manufacture the spring of different spacing, as hot component is played, can stretch and work under compressive load；
Spring super-elasticity and the hot stabilizability of bullet after the method for the present invention training is good, can be used for a long time.
Detailed description of the invention
Fig. 1 is the surface topography of diameter 0.3mm Nitinol fiber after room temperature drawing, and (a) figure is macrograph, (b) figure
For high power photo；
Fig. 2 is the photo of different screw pitch Nitinol springs, wherein (a) --- the screw pitch 0.36mm of spring, (b) --- bullet
The screw pitch 0.83mm of spring；
Fig. 3 is the temperature variation curve that the quick loading and unloading of Nitinol spring is recorded by infrared camera in the process, A
For loading procedure, B is uninstall process；
Fig. 4 is that Fig. 3 is quickly loaded in uninstall process, and the infrared photograph of spring surface Temperature Distribution, (a) figure is initial shape
State, (b) figure is the Temperature Distribution infrared photograph of spring surface after quick load, and (c) figure is spring surface temperature after fast discharging
The infrared photograph of distribution.
Specific embodiment
Embodiment 1: a kind of in the present embodiment 1 with the preparation method of Nitinol helical spring for playing fuel factor is to press
State step progress:
Step 1: Nitinol ingot casting is hot extruded into bar:
Firstly, Nitinol ingredient is the Ti-Ni alloy of nickel content 50.5% (atomic percent), it is true using electric arc melting
The method of suction casting prepares the cylinder ingot casting that diameter is 64mm, length is 100mm,
Then hot extrusion, detailed process is as follows:
After 1. cylinder ingot casting surface is using alcohol washes, drying process, in ingot casting surface coating glass lubricant (Beijing day
Make every effort to achieve glass Science and Technology Development Co., Ltd., TA-23 type), the coating thickness of glass lubricant is about 0.8mm, is put into 150 after coating
DEG C ventilation drying box in dry 0.5 hour；
2. graphitic lubricant is coated, by granularity 0.8 before coating squeezing sleeve interior surface and extrusion die prod cast inner surface
~5 μm of graphite powder (Harbin electric graphite plant) and lubricating oil (grand celebration gold Huifeng Science and Technology Ltd., APISN/GF-5 type) presses body
Product is stirred evenly than 1:1；Then placement annulus resistance furnace outside sleeve is being squeezed, sleeve will be being squeezed, extrusion die prod cast is heated to
1h is kept the temperature after 580 DEG C；
It is preheated 3. cylinder ingot casting is put into resistance furnace, with 30 DEG C/min of the rate of heat addition, is heated to 1100 DEG C, heat preservation
1h；
4. the cylinder ingot casting after preheating is put into extrusion die and carries out hot extrusion, alloy bar is obtained；Extrusion ratio is 16:1,
Extruding rate is 20mm/s；With the glass lubricant for the billet surface that sand paper removal hot extrusion obtains, obtains the smooth nothing in surface and split
The bar of line, diameter 15.6mm.
Step 2: wire-drawing die inner hole is equipped with a strata diamond film, at room temperature multiple tracks then using hot candied mold
Secondary to be drawn into fiber, specific drawing process presses table 1；
1 Nitinol drawing passes of table, mold internal diameter, drawing speed, accumulation equivalent strain and heat treatment
| Passage | Mold internal diameter (mm) | Drawing speed mm/s | It accumulates equivalent strain (%) | Heat treatment |
| 0 | Initial bar, diameter 15.6mm | / | / | Annealing |
| 1 | 13.82 | 3 | 24 | — |
| 2 | 12.23 | 3 | 49 | Annealing |
| 3 | 10.83 | 3 | 73 | — |
| 4 | 9.58 | 3 | 98 | Annealing |
| 5 | 8.48 | 3 | 122 | — |
| 6 | 7.5 | 3 | 147 | Annealing |
| 7 | 6.64 | 3 | 171 | — |
| 8 | 5.88 | 3 | 195 | Annealing |
| 9 | 5.2 | 3 | 220 | — |
| 10 | 4.6 | 7 | 244 | Annealing |
| 11 | 4.07 | 7 | 269 | — |
| 12 | 3.6 | 7 | 294 | Annealing |
| 13 | 3.19 | 7 | 318 | — |
| 14 | 2.7 | 7 | 351 | Annealing |
| 15 | 2.1 | 15 | 401 | — |
| 16 | 1.6 | 15 | 456 | Annealing |
| 17 | 1.3 | 15 | 497 | — |
| 18 | 1.1 | 15 | 531 | Annealing |
| 19 | 0.9 | 15 | 571 | — |
| 20 | 0.72 | 15 | 615 | Annealing |
| 21 | 0.6 | 15 | 652 | — |
| 22 | 0.5 | 15 | 688 | Annealing |
| 23 | 0.41 | 15 | 728 | — |
| 24 | 0.35 | 15 | 765 | Annealing |
| 25 | 0.3 | 15 | 797 | — |
Step 3: by 1 step 2, treated that fibre compact is wrapped on silicon nitride ceramics plug, and fiber is on plug
Along axial close-packed arrays, and both ends are fixed on plug, diameter Ф=0.7mm of plug is placed in quartz ampoule, by quartz ampoule
One end close in advance, the other end connect oil-sealed rotary pump, quartz ampoule is evacuated to vacuum degree 5 × 10-3After Pa, using oxygen
Gas-acetylene torch also closes the one end for connecting vacuum pump, completes sealing；
Step 4: being then heated to 1050 DEG C, 3h is kept the temperature, one end of quartz ampoule is put into room rapidly after quartz ampoule is taken out
It is caught broken in water under temperature and by its bottom, promotes water to immediately wick into quartz ampoule under vacuum, make to be wrapped in plug in pipe
The fiber fast cooling on surface takes out plug and the fiber that is wrapped on plug, is placed in low-temperature resistance furnace to the temperature of room temperature water,
At 474 DEG C, heat preservation 40min carries out ageing treatment, air-cooled, and spring is taken out from plug and obtains spring body；
Step 5: apply 50MPa load with the loading speed of 0.8MPa/s, then with the identical rate of loading speed by spring
Body is unloaded to zero stress；
Step 6: repeating the operation 40 times of step 5 to get the Nitinol helical spring is arrived.
The pattern for the fiber that diameter is 0.3mm is pulled in embodiment 1 as shown in Figure 1, can be seen that fibre from Fig. 1 (a) figure
There are a small amount of particle attachments in dimension table face；Axially there is the shallow drawing trace to be formed that rubs with mould inner wall in fiber.Fig. 1 (b)
Enlarged drawing shows that pit is shallower at drawing trace, not sharp scratch or crackle.
Diameter is the photo of the fiber difference screw pitch Nitinol spring of 0.3mm as shown in Fig. 2, spring outer diameter 1.3mm,
In (a) figure spring screw pitch 0.36mm, (b) the screw pitch 0.83mm of figure spring.
Temperature variation curve during the quick loading and unloading of Nitinol spring is as shown in figure 3, load and unloading speed
Rate is 20N/s, maximum load 4N, corresponding spring maximal tensility 14.1mm.The corresponding quickly load of the A section that temperature rapid increase
Process, temperature are climbed to 39.2 DEG C, 4.5 DEG C of ascensional range for 34.7 DEG C of environment temperature from test；B sections correspond to quickly unload
It carrying, for spring from maximum elongation replying state to reset condition, temperature rapidly drops to 26.7 DEG C for 34.7 DEG C of environment temperature from test,
8.0 DEG C of fall.
Fig. 4 is that Fig. 3 is quickly loaded in uninstall process, and the infrared photograph of spring surface Temperature Distribution, (a) figure is initial shape
State, (b) figure is quick load rear surface Temperature Distribution infrared photograph, and spring is elongated at this time, temperature increases, and (c) figure is quick
Infrared photograph after unloading, spring-return initial length, temperature are lower than test environment temperature at this time.
Claims (10)
1. it is a kind of with play fuel factor Nitinol helical spring preparation method, it is characterised in that the preparation method be by
What following step carried out:
Step 1: Nitinol ingot casting is hot extruded into bar；
Step 2: then by bar drawing at fiber；
Step 3: by step 2, treated that fibre compact is wrapped on the plug of stainless steel material, is sealed in quartz ampoule；
Step 4: being then heated to 1000 DEG C -1120 DEG C, 2h-5h is kept the temperature, fast cooling takes out plug and is wrapped on plug
Fiber, at 450 DEG C -500 DEG C, keep the temperature 0.5h-1h, it is air-cooled, spring is taken out from plug and obtains spring body；
Step 5: applying load to spring body, then it is unloaded to zero stress；
Step 6: repetition step 5 operates at least 29 times to get the Nitinol helical spring is arrived.
2. a kind of preparation method with the Nitinol helical spring for playing fuel factor, feature exist according to claim 1
The Nitinol ingot casting described in step 1 is adopted using the Ti-Ni alloy of nickel content 50%-50.5% (atomic percent) as raw material
With electric arc melting vacuum suction casting technique be made diameter be 30mm-100mm, the cylindrical ingot casting of length 60mm-100mm.
3. a kind of preparation method with the Nitinol helical spring for playing fuel factor, feature exist according to claim 2
The hot extrusion described in step 1 is completed by following step:
1., after ingot casting surface alcohol washes step is dried, be then coated with the glass lubricant of 0.5mm~1mm thickness, described
Glass lubricant is 900 DEG C -1100 DEG C and granularity < 5 μm of glassy solids material powder using temperature, is put into 140 after coating
It is dried 0.5 hour in DEG C -150 DEG C of ventilation drying box；
Step is 2., by graphite powder and lubricating oil, 1:1 is stirred evenly by volume, is then coated with and is squeezing sleeve interior surface and extruding
Mold prod cast inner surface places annulus resistance furnace squeezing outside sleeve, will squeeze sleeve, extrusion die prod cast is heated to 500-
0.5~1h is kept the temperature after 600 DEG C；
Step is 3., by step, 1. treated that ingot casting is put into resistance furnace preheats, and with 20~30 DEG C/min of the rate of heat addition, adds
Heat keeps the temperature 0.5~1h to 1050~1150 DEG C；
Step 4., 3. step is preheated after ingot casting be put into squeeze sleeve in by extrusion ratio be (9~16): 1 and extruding rate be
15~25mm/s carries out hot extrusion, then is polished with sand paper and remove the glass lubricant on surface, obtains the stick of the smooth flawless in surface
Material；Ingot casting is fetched into completion extrusion time from resistance furnace and is less than 10s.
4. a kind of according to claim 1,2 or 3 preparation method with the Nitinol helical spring for playing fuel factor, special
Sign is that diameter of rod described in step 1 is 5.2mm-15mm.
5. a kind of preparation method with the Nitinol helical spring for playing fuel factor, feature exist according to claim 1
In step 2, when the diameter of bar is 5.2-15mm, drawing speed control is in 2-5mm/s, drawing deformation amount controlling per pass
In 20%-30%；When the diameter of bar is 2.7-5.2mm, drawing speed is controlled in 5-10mm/s, drawing deflection control per pass
System is in 20%-30%；When the diameter of bar is 0.05-2.7mm, drawing speed is controlled in 10-20mm/s, and drawing deforms per pass
Amount control is in 30%-60%；Reach 40%~50%, 90%~100%, 140%~150%, 190% to cumulative deformation~
200%, 220%~230%, 290%~300%, 350%~360%, 450%~460%, 530%~540%, 610%
~620%, 680%~690%, 760%~770%, 820%~830%, 900%~910%, 950%~960%,
It is air-cooled after the 10-30min that anneals under the conditions of 450-550 DEG C when 1030%~1040 or 1110%~1120%；The drawing is
Rod end is worked into after slightly smaller than drawing mould hole size and is passed through from inner hole, bar is all drawn out to bar after mold
Diameter is consistent with the internal diameter of drawing mould, using the ever-reduced drawing mould of series of inner diameter, major diameter bar is prepared into small
Fiber diameters.
6. a kind of preparation method with the Nitinol helical spring for playing fuel factor, feature exist according to claim 1
The diameter of the fiber described in step 2 is 0.05-0.35mm.
7. a kind of preparation method with the Nitinol helical spring for playing fuel factor, feature exist according to claim 1
Diameter Ф=0.5mm-5.0mm of the plug described in step 3.
8. a kind of preparation method with the Nitinol helical spring for playing fuel factor, feature exist according to claim 1
Fast cooling is one end of quartz ampoule to be put into water at room temperature rapidly after taking out quartz ampoule and by its bottom in step 4
Portion is caught broken, and water is promoted to immediately wick into quartz ampoule under vacuum, makes the fiber fast cooling that mandrel surface is wrapped in pipe
To the temperature of room temperature water.
9. a kind of preparation method with the Nitinol helical spring for playing fuel factor, feature exist according to claim 1
30MPa-70MPa load is applied with the loading speed of 0.6MPa/s-1.0MPa/s in step 5, then with identical as loading speed
Rate spring body is unloaded to zero stress.
10. a kind of preparation method with the Nitinol helical spring for playing fuel factor, feature exist according to claim 1
Operation 29~49 times of step 5 are repeated in step 6.
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| CN110918840B (en) * | 2019-12-05 | 2020-11-06 | 中国石油大学(北京) | Method for preparing NiTi memory alloy spring by amorphous mold |
| CN113531949B (en) * | 2020-04-17 | 2023-03-31 | 南开大学 | Torsional heating refrigeration method based on electric heating refrigeration material |
| CN113174512B (en) * | 2021-03-29 | 2022-05-20 | 西安交通大学 | Non-cold-deformation high-elastic thermal effect Ti-Ni bulk material and preparation method thereof |
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| JPH0762506A (en) * | 1993-08-20 | 1995-03-07 | Furukawa Electric Co Ltd:The | Production of superelastic spring |
| CN1170834A (en) * | 1996-07-16 | 1998-01-21 | 中国科学院固体物理研究所 | Titanium-nickel spring with abnormal memory effect and its preparation |
| JP2000121451A (en) * | 1998-10-13 | 2000-04-28 | Tokin Corp | Temperature-sensitive element and manufacture thereof |
| CN106350702A (en) * | 2015-07-20 | 2017-01-25 | 深圳市星河泉新材料有限公司 | High-fatigue resistance titanium-nickel shape memory alloy |
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