CN109518103A - A method of Nitinol refrigeration efficiency is improved than, service life and temperature stability - Google Patents
A method of Nitinol refrigeration efficiency is improved than, service life and temperature stability Download PDFInfo
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- CN109518103A CN109518103A CN201811652761.XA CN201811652761A CN109518103A CN 109518103 A CN109518103 A CN 109518103A CN 201811652761 A CN201811652761 A CN 201811652761A CN 109518103 A CN109518103 A CN 109518103A
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- niti
- nitinol
- service life
- refrigeration efficiency
- temperature stability
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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
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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
Abstract
The present invention provides a kind of raising Nitinol refrigeration efficiency than, the method in service life and temperature stability, which comprises the steps of: step 1 obtains the nano-crystal nickel titanium alloy substrate that average grain size is about 5~30nm by cold working；Step 2 on step 1 gained nano-crystal nickel titanium alloy substrate surface with power is that 50~200 watts of continuous laser beam carries out local heat treatmet, 0.1~2s of duration, heat treatment spot diameterSpot spacing d=0.5~2mm；Matrix surface is polished to mirror surface by step 3.The present invention carries out local heat treatmet to nano-crystal nickel titanium alloy substrate surface using continuous laser beam, substantially increase the refrigeration efficiency ratio of the material, service life is extended simultaneously, the temperature range used has been widened, has taken into account the intensity and ductility of material, furthermore, processing technology is simple, and energy consumption is small, at low cost, it can quickly complete and come into operation, have a extensive future.
Description
Technical field
The invention belongs to Nitinol processing technique fields, and in particular to a kind of raising Nitinol refrigeration efficiency ratio, longevity
The method of life and temperature stability.
Background technique
Conventional compression formula refrigeration principle is by gaseous refrigerant working medium (such as freon), by means of the suction pressure of compressor
Contracting, the exothermic condensation of condenser, the reducing pressure by regulating flow of throttle valve, evaporator heat absorption vaporization do not stop cyclic process, reach make by
The purpose of cold object temperature decline.Since this method can cause huge harm to environment, develops and utilize new refrigeration
Technology and material are already extremely urgent.Solid-state Refrigeration Technique just attracts scientific research institution and work with its environmentally friendly huge advantage
The highest attention of industry.Nitinol is poor due to that can generate biggish entropy in recurring structure phase transition process, causes matrix obvious
Temperature change, and be highly valued for environmental sound in solid-state process of refrigerastion.However, traditional Nitinol makes
With there is mechanical property decline in the process, fatigue rupture, operating temperature section is narrow, cannot be considered in terms of intensity and ductility and Energy Efficiency Ratio
It is difficult to the problems such as increasing substantially, limits the material being widely used in solid-state refrigerating field.It is therefore desirable to design one kind
Nitinol refrigeration efficiency can be improved than, the method in service life and temperature stability.
Summary of the invention
In view of the problems of the existing technology, the technical solution that the present invention uses to solve problems of the prior art
It is as follows:
A method of Nitinol refrigeration efficiency is improved than, service life and temperature stability, which is characterized in that including as follows
Step:
Step 1 obtains the nano-crystal nickel titanium alloy substrate that average grain size is about 5~30nm by cold working；
Step 2, the continuous laser for being 50~200 watts with power on step 1 gained nano-crystal nickel titanium alloy substrate surface
Shu Jinhang local heat treatmet, 0.1~2s of duration are heat-treated spot diameterSpot spacing d=0.5
~2mm；
Matrix surface is polished to mirror surface by step 3.
Nano-crystal nickel titanium alloy substrate can be other alloys of NiTi base in the step 1, such as NiTi copper, NiTi copper cobalt, nickel
Titanium aluminium, NiTi hafnium, NiTi zirconium, NiTi vanadium, NiTi chromium, NiTi palladium, NiTi platinum and NiTi silver etc..
Nano-crystal nickel titanium-based alloy matrix shape made from the step 1 is plate, column, tubulose or flake, is used
The method of cold-drawn, cold rolling or high pressure torsion makes, and processing temperature is lower than 100 DEG C.
NiTi raw material are the superelastic NiTi alloy of near atomic ratio before being cold worked in the step 1, quasi- before being cold worked
Raw material need to be heated 1h in 800 DEG C and persistently lead to inert gas by standby work.
Laser beam spots should be symmetrically distributed in the inside and outside or front and rear surfaces of nano-crystal nickel titanium alloy substrate in the step 2
On, inside and outside or front and rear surfaces spot distributions keep identical as far as possible.
Laser beam temperature is maintained at 1000 DEG C or more in the step 2, laser beam spot spot diameterIt can root with spot spacing d
It is adjusted according to actual conditions,
Laser beam spot spot diameter in the step 2Size relationship needs to meet relational expression between spot spacing d:
In the step 3, polishing method is using mechanical polishing or electrobrightening, until surface is without micro-crack and reaches
Until mirror effect.
The present invention has the advantage that
The present invention carries out local heat treatmet to nano-crystal nickel titanium alloy substrate surface using continuous laser beam, substantially increases
The refrigeration efficiency ratio of the material, while extending service life, has widened the temperature range used, takes into account the intensity of material and prolongs
Malleability, in addition, processing technology is simple, energy consumption is small, at low cost, can quickly complete and come into operation, have a extensive future.
Detailed description of the invention
Fig. 1 is the method for the present invention processing technology schematic diagram；
Fig. 2 is the stress-strain relation figure of Nitinol at room temperature after the method for the present invention laser treatment；
Fig. 3 is the stress-strain relation figure of traditional Nitinol at room temperature；
Fig. 4 is stress-strain relation figure of the Nitinol at -10 DEG C after the method for the present invention laser treatment；
Fig. 5 is stress-strain relation figure of traditional Nitinol at -10 DEG C；
In figure, 1- nano-crystal nickel titanium alloy substrate, 2- laser beam spots.
Specific embodiment
Below with reference to the embodiments and with reference to the accompanying drawing the technical solutions of the present invention will be further described, such as Fig. 1
It is shown, a method of Nitinol refrigeration efficiency is improved than, service life and temperature stability, will contain 50.68% atomic nickel,
The Nitinol plate of 49.32% titanium is processed according to the following steps:
A, the nano-crystal nickel titanium alloy substrate 1 that average grain size is about 10nm is obtained by cold working；
B, local heat treatmet is carried out with the continuous laser beam that power is 100 watts on 1 surface of nano-crystal nickel titanium alloy substrate,
Duration 1s, 2 diameter of laser beam spotsSpot spacing d=1mm；
C, matrix surface is polished to mirror surface.
In step A, nano-crystal nickel titanium alloy substrate can be other alloys of NiTi base, and shape can be plate, pillar,
Pipe or thin slice etc. are made of the method for cold-drawn, cold rolling or high pressure torsion, and wherein processing temperature is lower than 100 DEG C, cold working
Preceding NiTi raw material are the superelastic NiTi alloy of near atomic ratio, and 1h is heated in 800 DEG C and persistently leads to inert gas, deformation
Homogeneous deformation should be kept in the process and makes matrix surface containing micro-crack few as far as possible.
In step B, laser beam spots should be symmetrically distributed in the inside and outside or front and rear surfaces of nano-crystal nickel titanium alloy substrate,
Inside and outside or front and rear surfaces spot distributions keep identical as far as possible, and laser beam temperature is maintained at 1000 DEG C or more, laser beam spots
DiameterIt can be adjusted according to the actual situation with spot spacing d, but need to meet
In step C, polishing method is using mechanical polishing or electrobrightening, until surface is without micro-crack and reaches mirror surface
Until effect.
Based on the embodiment of the present invention tested the result shows that, by the method for the present invention treated Nitinol solid-state system
Cold Energy Efficiency Ratio can achieve 40~50.As shown in Figure 2 and Figure 3, tension test is carried out at room temperature, and test result is compared
It was found that not only possessing the larger recoverable strain (4%) of traditional Nitinol through material made from present invention process, and intensity
It is twice or more of traditional Nitinol, shows that this method can make material take into account intensity and ductility, in addition, improved
Material hysteresis circle area is only the 1/4 of traditional material, this is beneficial to the fatigue life for improving material.As shown in figs. 4 and 5 ,-
Tension test is carried out at 10 DEG C, it was found that, is existed largely after traditional Nitinol loading and unloading at -10 DEG C to test result
Residual deformation, and the material after improving made from the method for the present invention technique can substantially return to original state, this is low temperature
Refrigeration provides possibility, shows that the method can be improved the temperature stability of the material.
Protection scope of the present invention is not limited to the above embodiments, it is clear that those skilled in the art can be to this hair
It is bright to carry out various changes and deformation without departing from scope and spirit of the present invention.If these changes and deformation belong to power of the present invention
In the range of benefit requirement and its equivalent technologies, then including the intent of the present invention also includes these changes and deforms.
Claims (8)
1. a kind of Nitinol refrigeration efficiency that improves is than, the method in service life and temperature stability, which is characterized in that including walking as follows
It is rapid:
Step 1 obtains the nano-crystal nickel titanium alloy substrate that average grain size is about 5~30nm by cold working；
Step 2, on step 1 gained nano-crystal nickel titanium alloy substrate surface with power be 50~200 watts continuous laser beam into
Row local heat treatmet, 0.1~2s of duration are heat-treated spot diameterSpot spacing d=0.5~
2mm；
Matrix surface is polished to mirror surface by step 3.
2. a kind of Nitinol refrigeration efficiency that improves as described in claim 1 is than, the method in service life and temperature stability, special
Sign is: nano-crystal nickel titanium alloy substrate can be other alloys of NiTi base in the step 1, such as NiTi copper, NiTi copper cobalt, NiTi
Aluminium, NiTi hafnium, NiTi zirconium, NiTi vanadium, NiTi chromium, NiTi palladium, NiTi platinum and NiTi silver.
3. a kind of Nitinol refrigeration efficiency that improves as described in claim 1 is than, the method in service life and temperature stability, special
Sign is: nano-crystal nickel titanium-based alloy matrix shape made from the step 1 is plate, column, tubulose or flake, and use is cold
It pulls out, cold rolling or the method production of high pressure torsion, processing temperature are lower than 100 DEG C.
4. a kind of Nitinol refrigeration efficiency that improves as described in claim 1 is than, the method in service life and temperature stability, special
Sign is: NiTi raw material are the superelastic NiTi alloy of near atomic ratio before being cold worked in the step 1, are prepared before being cold worked
Work chinese raw materials heats 1h in 800 DEG C and persistently leads to inert gas.
5. a kind of Nitinol refrigeration efficiency that improves as described in claim 1 is than, the method in service life and temperature stability, special
Sign is: laser beam spots should be symmetrically distributed in the inside and outside or front and rear surfaces of nano-crystal nickel titanium alloy substrate in the step 2,
Inside and outside or front and rear surfaces spot distributions keep identical as far as possible.
6. a kind of Nitinol refrigeration efficiency that improves as described in claim 1 is than, the method in service life and temperature stability, special
Sign is: laser beam temperature is maintained at 1000 DEG C or more in the step 2, laser beam spot spot diameterWith spot spacing d according to
Actual conditions are adjusted.
7. a kind of Nitinol refrigeration efficiency that improves as described in claim 1 is than, the method in service life and temperature stability, special
Sign is: laser beam spot spot diameter in the step 2Size relationship need to meet relational expression between spot spacing d:
8. a kind of Nitinol refrigeration efficiency that improves as described in claim 1 is than, the method in service life and temperature stability, special
Sign is: in the step 3, polishing method is using mechanical polishing or electrobrightening, until surface is without micro-crack and reaches
Until mirror effect.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811652761.XA CN109518103B (en) | 2018-12-28 | 2018-12-28 | Method for improving nickel-titanium alloy refrigeration energy efficiency ratio, service life and temperature stability |
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| CN201811652761.XA CN109518103B (en) | 2018-12-28 | 2018-12-28 | Method for improving nickel-titanium alloy refrigeration energy efficiency ratio, service life and temperature stability |
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| CN109518103B CN109518103B (en) | 2020-11-03 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111842888A (en) * | 2020-06-18 | 2020-10-30 | 华中科技大学 | 4D printing method of nickel titanium based ternary shape memory alloy |
| CN112899596A (en) * | 2021-03-09 | 2021-06-04 | 清华大学 | Method for improving refrigeration performance by regulating stress-strain response of nickel-titanium alloy |
| CN113046659A (en) * | 2021-03-09 | 2021-06-29 | 清华大学 | Method for preparing nickel-titanium shape memory alloy with gradient nanocrystalline grain structure |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101899592A (en) * | 2010-08-03 | 2010-12-01 | 华中科技大学 | Method for synthesizing arbitrarily shaped NiTi shape memory alloy in situ |
| CN102828066A (en) * | 2012-09-07 | 2012-12-19 | 哈尔滨工程大学 | Method for preparing functionally continuous gradient Ti-Ni shape memory alloy |
| CN104662185A (en) * | 2013-03-15 | 2015-05-27 | Ati资产公司 | Thermo-mechanical processing of nickel-titanium alloys |
| CN104846367A (en) * | 2015-05-09 | 2015-08-19 | 芜湖鼎瀚再制造技术有限公司 | Laser thermal treatment process of gear |
| CN106834808A (en) * | 2017-02-17 | 2017-06-13 | 武汉理工大学 | A kind of Ni3Al based self-lubricating materials and preparation method thereof |
| CN108130528A (en) * | 2016-12-01 | 2018-06-08 | 林艳红 | A kind of surface laser cladding nickel-base alloy |
-
2018
- 2018-12-28 CN CN201811652761.XA patent/CN109518103B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101899592A (en) * | 2010-08-03 | 2010-12-01 | 华中科技大学 | Method for synthesizing arbitrarily shaped NiTi shape memory alloy in situ |
| CN102828066A (en) * | 2012-09-07 | 2012-12-19 | 哈尔滨工程大学 | Method for preparing functionally continuous gradient Ti-Ni shape memory alloy |
| CN104662185A (en) * | 2013-03-15 | 2015-05-27 | Ati资产公司 | Thermo-mechanical processing of nickel-titanium alloys |
| CN104846367A (en) * | 2015-05-09 | 2015-08-19 | 芜湖鼎瀚再制造技术有限公司 | Laser thermal treatment process of gear |
| CN108130528A (en) * | 2016-12-01 | 2018-06-08 | 林艳红 | A kind of surface laser cladding nickel-base alloy |
| CN106834808A (en) * | 2017-02-17 | 2017-06-13 | 武汉理工大学 | A kind of Ni3Al based self-lubricating materials and preparation method thereof |
Non-Patent Citations (3)
| Title |
|---|
| SANGWOOK SIHN等: "Computational and experimental study on laser heating of a Ni-based metal alloy", 《INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER》 * |
| 姜卫利等: "Ti-Ni形状记忆合金记忆疲劳寿命的研究", 《力学与实践》 * |
| 沈利群: "钛镍及其合金的激光热处理现状", 《热处理》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111842888A (en) * | 2020-06-18 | 2020-10-30 | 华中科技大学 | 4D printing method of nickel titanium based ternary shape memory alloy |
| CN112899596A (en) * | 2021-03-09 | 2021-06-04 | 清华大学 | Method for improving refrigeration performance by regulating stress-strain response of nickel-titanium alloy |
| CN113046659A (en) * | 2021-03-09 | 2021-06-29 | 清华大学 | Method for preparing nickel-titanium shape memory alloy with gradient nanocrystalline grain structure |
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| CN109518103B (en) | 2020-11-03 |
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