CN85104151A - Aerospace vehicle temperature control window shutter bi-directional drive element manufacture method - Google Patents
Aerospace vehicle temperature control window shutter bi-directional drive element manufacture method Download PDFInfo
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- CN85104151A CN85104151A CN198585104151A CN85104151A CN85104151A CN 85104151 A CN85104151 A CN 85104151A CN 198585104151 A CN198585104151 A CN 198585104151A CN 85104151 A CN85104151 A CN 85104151A CN 85104151 A CN85104151 A CN 85104151A
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- window shutter
- directional drive
- drive element
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Abstract
A kind of bi-directional drive element and manufacturing process thereof that is applicable to aerospace vehicle temperature control window shutter.This element is made of the Ni-Ti bianry alloy, and this alloy contains 50.6-50.8% (atomic ratio) Ni, and all the other are Ti.Alloy strip steel rolled stock loads typing more than the Ms temperature, band carries pyroprocessing, band carries sub zero treatment, and 0 ℃ of unloading promptly forms two-way memory effect.This element weight is light, volume is little, driving force is big, thermo-lag is little, can improve the thermal behavior of window shutter, reduces the operating chamber volume, improves the thermal efficiency, saves the energy.
Description
The invention belongs to space travel equipment component manufacture method.
The present invention is the method for making a kind of bi-directional drive element of the Ni-Ti marmem, and this element is applicable to aircraft temperature control window shutter.Promptly when temperature changed from high to low or from low to high, element can be another kind of shape by a kind of transfer of shapes spontaneously to so-called bi-directional drive, drove the window shutter breakdown simultaneously or closed.
At present, aircraft temperature control window shutter driving element is made of bimetallic material mostly, its principle is to utilize two kinds of expansion of metal coefficient differences, and to the difference driving element of temperature sensitivity, its shortcoming is that component structure is heavy, efficient is low, sensitivity is low, thermo-lag is big.The object of the present invention is to provide a kind of novel driving element to replace bimetallic element.This new-type element has two-way memory effect, remembers a kind of shape when high temperature, remembers another kind of shape when the low-temperature martensite state, and element just changes shape automatically when temperature variation.The advantage of this novel driving element provided by the invention is that volume is little, in light weight, intensity is high, corrosion stability and high abrasion resistance, highly sensitive, thermo-lag is little, driving force is big.
The alloy composition that the present invention adopts is the 50.6-50.8%(atomic ratio) the Ni-Ti bianry alloy.With No. zero nickel and one-level titanium sponge is that raw material is smelted into ingot one time in consumable electrode vacuum furnace, again through the induction furnace remelting.Alloy carries out homogenising at 900-1000 ℃ and handles then, forges into behind the square billet in 850-950 ℃ again and is rolled into the thick strip of 0.3-0.4 millimeter that be, cuts into wide 8 millimeters tape again, is the blank of processing driving element.
The preparation method of element is: tape annealed under 350-500 ℃ of temperature eliminate part stress earlier, and easily deformable to guarantee material, and be easy to produce stress-induced martensite, this temperature is the treatment temperature of giving of element.Then more than alloy Ms temperature with material bending typing (snail shape), band is loaded in 500-600 ℃ and carries out pyroprocessing subsequently, band puts into cryogenic media (5-0 ℃) again, at last 0 ℃ of unloading, this moment, element promptly obtained two-way memory effect.
The control deflection is 8-10% during the element typing, make the element internal tissue produce stress-induced martensite, the pyroprocessing of short time makes the martensite in the element become high temperature B2 phase by the track reverse that retrains, with the fixing shape of high temperature phase, a band year cooling makes the interior martensitic stucture oriented growth of element and grows up, therefore, when element cools off, martensitic stucture in the element changes the abnormal tissue of single martensite into according to single abnormal phase transformation law, the deformation (low temperature shape) when finishing martensitic state.Element restores to the original state according to reverse becoming rule during intensification, the two-way memory effect of Here it is element.
This Ni-Ti memorial alloy bi-directional drive element provided by the invention weighs 4 grams, 29 millimeters of external diameters, and bimetallic element weighs 28 grams, 40 millimeters of external diameters.Bilateral element weight only is 1/7 of bimetallic element, and volume only is 3/5 of a bimetallic element.
In light weight, volume is little significant concerning the thermal design of aerospace vehicle, can not only improve the thermal behavior of window shutter, can also reduce the volume of operating chamber, reduces the thermal leakage ratio of operating chamber thereupon, improves the thermal efficiency, saves energy resource consumption.
This Ni-Ti bi-directional drive element provided by the invention is in the change of shape process, the restoring force that produces is far longer than the power that bimetallic element produces, during as half-twist, 6.8 kilograms of millimeters of Ni-Ti driving element work done, and bimetallic element acting only is 1.3 kilograms of millimeters, is 5.2 times of bimetallic element.
The two-way memory effect sensitivity of this bi-directional drive element provided by the invention, stable, through more than 20,000 thermal cycling tests, element rotational angle and sensitivity are unaffected.(ρ-T) curve has determined that accurately the Ms point temperature of element is-2 ℃, and As point temperature is 3 ℃ by resistivity and temperature.Resistivity when having measured the resistivity Ms temperature of high low temperature phase is 87.3 μ Ω-cm, and the resistivity during the As temperature is 82.2 μ Ω-cm.The different piece of curve has shown different crystal structure characteristics, and find bi-directional drive element ρ-T curve by low temperature during to pyrolytic conversion the ρ peak value tangible broadening phenomenon is arranged, this phenomenon proof has residual martensite to exist in this temperature range, and this is the foundation of two-way memory effect sensitivity.At the LN2(liquid nitrogen) the ρ curve generally rises in the environment, and low-temperature space has tangible martensite to transform phenomenon.Accompanying drawing is that ((curve of θ-T), having confirmed that ρ varies with temperature recovers angle with shape and have closely and link, and has corresponding relation mutually for the curve of ρ-T) and angle-temperature for the resistivity-temperature of bi-directional drive element.As 1. some place, a line shows turning point, i.e. B when cooling
2+ R → R changes starting point mutually.The b line is θ standard-sized sheet → complete shut-down operating point (16 ℃ time).2. some place, a line is R → R+B
19Phase transition point (being Ms), b line show θ angle trend complete shut-down.3. the some a of place line shows B
19+ R → R phase transition point (As), the b line shows the operating point by complete shut-down → standard-sized sheet.4. the some a of place line shows R → R+B
2Phase transition point, b line show θ angle standard-sized sheet.
ρ-T, the standard-sized sheet of θ-T curve proof bi-directional drive element is consistent with complete shut-down temperature and change in resistance, and the working temperature district of proof element just alloy give the martensite stage and present the district, so advantage such as that element possesses is highly sensitive, thermo-lag is little, be swift in motion.
Claims (3)
1, a kind of manufacture method of Ni-Ti memorial alloy bi-directional drive element is characterized in that this alloy contains 50.6-50.8% (atomic ratio) nickel, and surplus is Ti.Described alloy strip steel rolled stock is annealed under 350-500 ℃ of temperature, again in the above bend fixing of Ms temperature, (deflection is controlled in the 8-10% scope) band then is loaded in 500-600 ℃ of pyroprocessing, and band carries and quenches into cryogenic media (5 ℃-0 ℃), last 0 ℃ of unloading again.
2, the optimum temperature range according to the said pyroprocessing of claim 1 is 500-550 ℃.
3, can adopt frozen water according to claim 1 and 2 said cryogenic medias.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85104151A CN85104151B (en) | 1985-06-04 | 1985-06-04 | Producing method for dual-direction driving element of temp.-control blind of space craft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85104151A CN85104151B (en) | 1985-06-04 | 1985-06-04 | Producing method for dual-direction driving element of temp.-control blind of space craft |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85104151A true CN85104151A (en) | 1986-12-03 |
| CN85104151B CN85104151B (en) | 1988-04-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85104151A Expired CN85104151B (en) | 1985-06-04 | 1985-06-04 | Producing method for dual-direction driving element of temp.-control blind of space craft |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN85104151B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103343309A (en) * | 2013-06-26 | 2013-10-09 | 西安赛特金属材料开发有限公司 | Method for manufacturing memory alloy spacecraft unlocking drive element |
| CN111060210A (en) * | 2019-12-20 | 2020-04-24 | 佛山科学技术学院 | Double-temperature alarm and preparation method thereof |
-
1985
- 1985-06-04 CN CN85104151A patent/CN85104151B/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103343309A (en) * | 2013-06-26 | 2013-10-09 | 西安赛特金属材料开发有限公司 | Method for manufacturing memory alloy spacecraft unlocking drive element |
| CN111060210A (en) * | 2019-12-20 | 2020-04-24 | 佛山科学技术学院 | Double-temperature alarm and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN85104151B (en) | 1988-04-27 |
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