CN100547095C - The technology of TiNi shape memory alloy smelting ultra-pure - Google Patents
The technology of TiNi shape memory alloy smelting ultra-pure Download PDFInfo
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- CN100547095C CN100547095C CNB2007100119769A CN200710011976A CN100547095C CN 100547095 C CN100547095 C CN 100547095C CN B2007100119769 A CNB2007100119769 A CN B2007100119769A CN 200710011976 A CN200710011976 A CN 200710011976A CN 100547095 C CN100547095 C CN 100547095C
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- 229910010380 TiNi Inorganic materials 0.000 title claims abstract description 64
- 229910001285 shape-memory alloy Inorganic materials 0.000 title claims abstract description 31
- 238000003723 Smelting Methods 0.000 title claims abstract description 29
- 238000005516 engineering process Methods 0.000 title abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 39
- 239000000203 mixture Substances 0.000 claims abstract description 14
- 239000000956 alloy Substances 0.000 claims description 72
- 229910045601 alloy Inorganic materials 0.000 claims description 71
- 238000006243 chemical reaction Methods 0.000 claims description 30
- 238000010438 heat treatment Methods 0.000 claims description 29
- 230000008569 process Effects 0.000 claims description 29
- 238000002844 melting Methods 0.000 claims description 27
- 230000008018 melting Effects 0.000 claims description 27
- 229910052719 titanium Inorganic materials 0.000 claims description 25
- 239000007789 gas Substances 0.000 claims description 23
- 229910052759 nickel Inorganic materials 0.000 claims description 13
- 238000007670 refining Methods 0.000 claims description 10
- 239000007858 starting material Substances 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 9
- 229910052804 chromium Inorganic materials 0.000 claims description 6
- 230000003247 decreasing effect Effects 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 239000011261 inert gas Substances 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 229910052720 vanadium Inorganic materials 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims description 2
- 239000004615 ingredient Substances 0.000 claims description 2
- 238000010309 melting process Methods 0.000 claims description 2
- 229910001000 nickel titanium Inorganic materials 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 claims 1
- 230000009466 transformation Effects 0.000 abstract description 13
- 239000000463 material Substances 0.000 abstract description 3
- 239000010936 titanium Substances 0.000 description 41
- 229910000734 martensite Inorganic materials 0.000 description 15
- 229910052760 oxygen Inorganic materials 0.000 description 15
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 14
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 12
- 239000001301 oxygen Substances 0.000 description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 9
- 229910052786 argon Inorganic materials 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 7
- 239000012535 impurity Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000003672 processing method Methods 0.000 description 5
- 238000005275 alloying Methods 0.000 description 4
- 239000010439 graphite Substances 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 241000209456 Plumbago Species 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
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- 238000007499 fusion processing Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 240000005373 Panax quinquefolius Species 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
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- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
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- 230000006870 function Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- KHYBPSFKEHXSLX-UHFFFAOYSA-N iminotitanium Chemical compound [Ti]=N KHYBPSFKEHXSLX-UHFFFAOYSA-N 0.000 description 1
- 239000000976 ink Substances 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 238000005339 levitation Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
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- 229910052751 metal Inorganic materials 0.000 description 1
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- 239000000126 substance Substances 0.000 description 1
- 230000035924 thermogenesis Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
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Abstract
The present invention relates to a kind of method of TiNi shape memory alloy smelting ultra-pure, specifically be used for the smelting ultra-pure technology of TiNi shape memory alloy.Because the TiNi shape memory alloy is a kind of material very high to the accuracy requirement of composition, the wherein variation of the 0.1%at of Ni content, can cause the variation of transformation temperature 10-20 degree, foreign matter content is by following control: O＜500ppm, N＜30ppm, only in this way just can have good elastic performance, can reach transformation temperature accurately according to composition.
Description
One, technical field
The invention belongs to the material field of metallurgy, the method for the smelting ultra-pure of design TiNi shape memory alloy.Specifically be applicable to the processing method of TiNi shape memory alloy precise control composition.
Two, background technology
The shape memory effect of TiNi memorial alloy realizes by martensitic transformation.Therefore, the martensitic transformation temperature of control alloy is the key of producing this alloy.In the TiNi memorial alloy, be C, N, O to the most responsive element of martensite transformation temperature, and in this alloy, want strict these elements of control to be difficult to.
Ti in the TiNi alloy is the IVB family in the periodictable, is the element of strong metal, and is active especially, and with nonmetallic O, N, C have extremely strong chemical combination tendency, brought very big difficulty for production fine TiNi alloy.Therefore, domesticly failing to mass-produce fine TiNi shape memory alloy so far, abroad, also only is that limited producer can produce.
MgO, Al2O3 crucible high-temperature stability with routine are fine, but can't melt out the TiNi memorial alloy of low O.Because the bonding force of the bonding force of O and Ti and Mg and Al is close, during with the TiNi alloy of the high Ti of this crucible for smelting, crucible is reduced rapidly, forms a large amount of TiO slags.Therefore, people are forced to adopt the magnetic levitation melting of no crucible, or with the non-consumable method melting of water jacketed copper crucible.The TiNi shape memory alloy that can produce with this class methods melting, but this method complex process output is limited, and cost is high too, therefore, is difficult to large-scale production.
The solubleness of finding carbon in the TiNi alloy afterwards is lower, adopts plumbago crucible melting TiNi alloy, but the difficult control of carbon content, and carbon has extremely sensitivity to martensite transformation temperature.Its influence degree is as shown in the table:
Carbon content is delivered the influence of temperature (K) to martensite
| C％ | Ms | Mf | As | Af |
| 0.05 | 290 | 240 | 305 | |
| 0.02 | 335 | 305 | 345 | 360 |
Know by table, when carbon content only changes 0.03%, parent phase is begun to be transformed into Martensite temperature (Ms), changed 45K; Parent phase is all changed into Martensite temperature (Mf), changed 65K; Martensite is all changed into the temperature (Af) of parent phase, changed 55K.With the TiNi memorial alloy of plumbago crucible melting, though aspect the control martensite transformation temperature, there is bigger shortcoming, for producing the condition of having created in enormous quantities.Therefore, the technology of the TiNi memorial alloy of producing in batches at present mainly is still in vacuum induction furnace and carries out with plumbago crucible.The martensite transformation temperature of the TiNi memorial alloy of Sheng Chaning is uncertain thus, need measure every stove, therefrom selects satisfactory alloy to use.What is called is: producing is what, and what is calculated.Our target is, what, and what produced, but also want low production cost.
This shows, controlled foreign matter content in the alloy well, also just solved a difficult problem that obtains accurate transformation temperature, abroad also at the China ink of starting writing greatly for this reason, but the control of composition is also unsatisfactory, and our focus is to control foreign matter content, obtain transformation temperature preferably, improve yield rate.
Therefore, select the better CaO crucible of a kind of stability, the high titanium TiNi of melting alloy in vacuum induction furnace.Ti can reduction mould under this condition, thereby can guarantee that oxygen level is lower in the TiNi alloy, and low production cost.Following table is the control degree of CaO crucible to oxygen level:
Gas and foreign matter content in the TiNi alloy of crucible for smelting
| Crucible | MgO | Graphite | Extraordinary CaO crucible |
| Oxygen level ppm | 1000 | 1000 | ∠500 |
| Nitrogen content ppm | 800 | 700 | ∠30 |
| C content ppm | 400 | 700 | 0 |
Oxygen level in the TiNi alloy is extremely important, is not only the martensitic transition temperature of oxygen influence itself, and, can form titanium oxide, change principal constituent, also influence martensitic transition temperature.Oxygen level is to the prior influence of TiNi alloy, more be influence, when the oxygen level in the alloy is higher, will form Ti4Ni2O hot workability, and with TiNi form mutually 900 the degree about low melting point eutectic, this will have a strong impact on the hot workability of TiNi alloy.
In sum, can effective control of impurity element and gas content, alloying constituent arrive the state of use to the TiNi alloy, promptly obtains the use properties of martensitic transition temperature and alloy, is vital.Therefore, adjust the composition of alloying element, reduce foreign matter content, reduce the gas content in the alloy, can improve metallurgical quality be the key point that obtain the high-performance memorial alloy.
But the applicant finds, though only by adopting the CaO crucible can partly reduce the content of oxygen in the TiNi alloy, but effect is still desirable, though self introduce oxygen to reaction system because the CaO crucible can reduce, but because the utmost point activity of Ti in the alloy, and the non-reversibility of oxygen and Ti reacting generating compound, can't stop Ti reaction owing to self reason and oxygen in reaction process, as inevitably being present in the impurity oxygen in the crucible, the decomposition of aqueous vapor etc.The report that has some to adopt the CaO crucible to carry out the memorial alloy melting in the prior art, but the applicant finds, disclosed technological process is too general, ambiguous in the prior art, in actual fusion process, only still be difficult to obtain high performance memorial alloy according to described step, its reason is: because the intensity of TiNi alloy reaction, in smelting process for the TiNi memorial alloy, not only be the selection of crucible, equally very important for the control of smelting technology process.Though the technique scheme that prior art adopts adopts CAO crucible intelligent control part gas content, does not take into full account the special process of Ni, Ti reaction itself, thereby can not effectively control the oxidation owing to the overheated TI that produces; The present invention is thus in order to overcome above-mentioned defective, through a large amount of test, analysis, summaries, technological process, processing step, processing condition etc. are done corresponding improvement, made fusion process overcome the deficiency of above-mentioned document, better obtained high performance TiNi memorial alloy.The present invention has adopted discontinuity control in smelting process, utilizes heat balance principle to avoid overheated; The applicant is directed in smelting process and controls Heating temperature by the adjustment to output power, realizes gradient control, and it is overheated to prevent, realizes thermal equilibrium.
Three, summary of the invention
The purpose of this invention is to provide a kind of can smelting ultra-pure TiNi shape memory alloy processing method, the memorial alloy that uses this method to smelt can be controlled the composition of principal element exactly, guarantees gas content O＜500PPM simultaneously, N＜30PPM, C content almost is 0, has also controlled foreign matter content.
For achieving the above object, the technical scheme that is adopted is:
1, selects the crucible CaO crucible of high-temperature stability, it can not be reduced by the Ti of high reductibility in smelting process, form the oxide compound of Ti and influence components in proportions, simultaneously, owing to the ratio of Ni and Ti accurately obtains design mix exactly, obtain stablizing the TiNi shape memory alloy of transformation temperature.
2, the melting technology under employing segmentation control, vacuum melting, the protection of inert gas can guarantee that the impurity that the external world brings is not introduced into, also because melting and cast under the protection of rare gas element prevents that splash is to guarantee that composition is accurate.
3, make full use of alloying and heat release and carry out the next stage reaction, make full use of the characteristic of alloying heat release, rationally carry out melting control, prevented the oxidation of thermogenesis Ti.
Concrete technical scheme of the present invention is as follows:
1. the smelting process of a TiNi shape memory alloy is used CaO crucible for smelting TiNi shape memory alloy, and its technological process comprises:
1) alloy raw material is got starting material according to the component proportions of the TiNi shape memory alloy that designs, Ti, Ni and optional supplementary component Cr or V;
2) starting material charging: Ni, part Ti (50%-70%) and optional supplementary component Cr or V are packed in the CaO crucible simultaneously, standby in the remaining Ti drain hopper;
3) melting: be evacuated to 0.13-2Pa, after Ni and Ti react, feed rare gas element and protect to 0.08-0.10MPa, smelting temperature is higher than fusing point 50-100 ℃;
4) alloy melting: after reaction is carried out, stop heating earlier, rely on the combination reaction heat release of NITI alloy to carry out late phase reaction, the back according to temperature of reaction, is sent electrically heated along with reaction is carried out, and regulates the heating unit heating power gradually, evenly stirs;
5) after the fusing fully of once feeding in raw material, carry out secondary charging: vacuumize, residue Ti standby in the hopper is dosed in the crucible, towards rare gas element;
6) secondary send electrically heated, regulates the heating unit heating power, stirs;
7) refining and modifying, at 1300-1400 ℃ of refining 3-5 minute, scull;
8) alloy liquid casting: heating ingot film to 400 ℃, under protection of inert gas, pour into a mould in being higher than alloy melting point 100 degree (about 1400 ℃), TiNi memorial alloy ingot.
2. the wherein preferred rare gas element that adopts is an argon gas.
3. the wherein preferred once content of the reinforced part Ti that adds is 50-70%, and it is 50-30% that secondary charging adds residue Ti.
4. wherein preferred: in the step 4) alloy melting process, because the combination reaction of TiNi is thermopositive reaction, therefore adopt the mode of the heating of successively decreasing, promptly alloy melting send the adding power adjustment procedure of electricity to be regulated down to 0kw for being regulated gradually by 30kw, to keep the stable of plant process.
5. the step 5) secondary send the electrically heated process, owing to newly added remaining Ti, corresponding employing increases progressively the mode of heating, heightens the heating unit heating power gradually, is adjusted to 20KW gradually by 0, to keep the stable of plant process.
6. resulting TiNi shape memory alloy major ingredient is Ni and Ti, and the composition scope is Ni 50%-51%at, Ti49-50% and based on the total atom number of Ni and Ti, and Cr is that 0～0.3at% or V are the supplementary component of 0～0.5%at.
7. gas content O＜500PPM, N＜30PPM in the resulting TiNi shape memory alloy.
Four. description of drawings
Ni wt%-Mf, Ni wt%-Ms, Ni wt%-Af, Ni wt%-As graph of a relation in the accompanying drawing 1 TiNi alloy.
By accompanying drawing 1, can find out that the variation of Ni 1%at can cause Af 10-20 ℃ variation; As seen the ratio of Ni, Ti content for alloy A f impact greatly, therefore accurately control the ratio of TiNi alloy by process of the present invention, just can be in manufacture process clock like precision Af and Ni-Ti content are connected, have great meaning for production.
The present invention has following advantage:
1, the design mix of TiNi shape memory alloy material can accurately be controlled with design martensite transformation temperature Af. Because the control of impurity content and gas content, so that the accurate composition control of material, and what affect martensite transformation temperature is the ratio of Ni and Ti, and therefore, it is accurate that composition just means that accurately Af is ordered.
2, good processability, the control of gas content, limited Ti and O change and, do not form Ti4Ni2O, can not with TiNi form mutually 900 the degree about low melting point eutectic. Make the processing characteristics of memorial alloy become very excellent.
3, the O content that keeps in the alloy just in time is the solid solution capacity of TiNi marmem, and the composition of alloy is impact not.
4, by the improvement to technical process, rationally utilized the characteristic of Ni, Ti exothermic heat of reaction, not only effectively prevent the oxidation of the overheated Ti that causes of course of reaction, and saved the needs that add the routine techniques such as strong deoxidier in the system, thereby reduced the cost of introducing the probability of other impurity and having reduced preparation TiNi alloy in the alloy.
Involved in the present invention is the smelting ultra-pure technique of TiNi marmem, and the TiNi marmem that this smelting process is smelted is applicable to various products for hyperelastic function, intelligent element, bio-medical material etc.
Five. embodiment
Embodiment 1:
Adopt the processing method of smelting ultra-pure TiNi shape memory alloy to obtain TiNi shape memory alloy ingot use CaO crucible, preparation TiNi shape memory alloy ingot, concrete technology:
1, starting material charging is got starting material according to the component proportions Ti49.15Ni50.85 atomic ratio of design, No. 0 Ti and No. 1 Ni, and the order of charging is that Ni and 40%Ti pack in the crucible simultaneously, and is standby in the Ti drain hopper of residue 60%.
2, be evacuated to 0.13Pa, towards argon gas to 0.08MPa.
3, alloy melting send electric 30kw-20kw-0kw, and the heating of successively decreasing keeps system reaction heat balance, evenly stirs.
4, vacuumize, 60%Ti standby in the hopper is dosed in the crucible, towards argon gas.
5, send electrically heated, heating power is increased progressively by 0-20KW, keep system reaction heat balance, stir.
6, refining and modifying is at 1300-1400 degree refining 5 minutes, scull.
7, alloy liquid is poured into a mould, and heating ingot film to 400 degree in being higher than alloy melting point 100 degree cast, gets TiNi memorial alloy ingot.
Embodiment 2
Adopt the processing method of smelting ultra-pure TiNi shape memory alloy to obtain TiNiCr shape memory alloy ingot use CaO crucible, preparation TiNi shape memory alloy ingot, concrete technology:
1, starting material charging, get starting material (wherein the implication of Cr0.3 be based on the ratio of Ti+Ni=100%at be 0.3%at) according to component proportions (%) the Ti49.15Ni50.85Cr0.3 atomic ratio of design, No. 0 Ti and No. 1 Ni, the order of charging is that Ni and 40%Ti0.3%Cr pack in the crucible simultaneously, and is standby in the Ti drain hopper of residue 60%.
2, be evacuated to 0.13Pa, towards argon gas to 0.08MPa.
3, alloy melting send electric 30kw1-20kw-0kw, and the heating of successively decreasing keeps system reaction heat balance, evenly stirs.
4, vacuumize, 60%Ti standby in the hopper is dosed in the crucible, towards argon gas.
5, send electrically heated, 0-20KW increases progressively, and keeps system reaction heat balance, stirs.
6, refining and modifying is at 1300-1400 degree refining 5 minutes, scull.
7, alloy liquid is poured into a mould, and heating ingot film to 400 degree in being higher than alloy melting point 100 degree cast, gets TiNiCr memorial alloy ingot.
Embodiment 3
Adopt the processing method of smelting ultra-pure TiNi shape memory alloy to obtain TiNiV shape memory alloy ingot use CaO crucible, preparation TiNi shape memory alloy ingot, concrete technology:
1, starting material charging, get starting material (wherein the implication of V0.5 be based on the ratio of Ti+Ni=100%at be 0.5%at) according to component proportions (%) the Ti49.15Ni50.85V0.5 atomic ratio of design, No. 0 Ti and No. 1 Ni, the order of charging is that Ni and 40%Ti pack in the crucible simultaneously, and is standby in the Ti drain hopper of residue 60%.
2, be evacuated to 0.13Pa, towards argon gas to 0.08MPa.
3, alloy melting send electric 30kw-20kw-0kw, and the heating of successively decreasing is evenly stirred.
4, vacuumize, 60%Ti standby in the hopper is dosed in the crucible, towards argon gas.
5, send electrically heated, 0-20KW increases progressively, and stirs.
6, refining and modifying is at 1300-1400 degree refining 5 minutes, scull.
7, alloy liquid is poured into a mould, and heating ingot film to 400 degree in being higher than alloy melting point 100 degree cast, gets TiNiV memorial alloy ingot.
Claims (6)
1. the smelting process of a TiNi shape memory alloy is used CaO crucible for smelting TiNi shape memory alloy, and its technological process comprises:
1) gets starting material according to the component proportions of the TiNi shape memory alloy that designs, Ti, Ni and optional supplementary component Cr or V;
2) starting material charging: with Ni, pack into simultaneously in the CaO crucible, standby in the remaining Ti drain hopper based on the Ti of total Ti content 50-70% and optional supplementary component Cr or V;
3) alloy melting: be evacuated to 0.13-2Pa, after Ni and Ti react, feed rare gas element and carry out protection of inert gas to 0.08-0.10MPa, smelting temperature is higher than fusing point 50-100 ℃;
4) alloy melting reaction: after reaction is carried out, stop heating, rely on the combination reaction heat release of TiNi alloy to carry out late phase reaction, and,, send electrically heated according to temperature of reaction along with the carrying out that reacts, regulate the heating unit heating power gradually, by the thermal equilibrium of this gradient control maintenance reaction system, it is overheated to prevent to react, and reaction process evenly stirs;
5) after the fusing fully of once feeding in raw material, carry out secondary charging: vacuumize, residue Ti standby in the hopper is dosed in the crucible, feed rare gas element;
6) secondary send electrically heated, regulates the heating unit heating power, stirs;
7) refining and modifying, at 1300-1400 ℃ of refining 3-5 minute, scull;
8) alloy liquid casting: heating ingot film to 400 ℃, under protection of inert gas, in being higher than alloy melting point 100 degree cast, TiNi memorial alloy ingot.
2. smelting process as claimed in claim 1 is characterized in that: rare gas element is Ar.
3. smelting process as claimed in claim 1, it is characterized in that: in the step 4) alloy melting process, because the combination reaction of NiTi is thermopositive reaction, therefore adopt the mode of the heating of successively decreasing, be that alloy melting send the heating power regulate process of electricity to be regulated down to 0kw for being regulated gradually by 30kw, with the thermal equilibrium of the stable and reaction system that keeps plant process, it is overheated to prevent to react.
4. as each described smelting process of claim 1-3, it is characterized in that: the step 5) secondary send the electrically heated process, owing to newly added remaining Ti, corresponding employing increases progressively the mode of heating, heighten the heating unit heating power gradually, be adjusted to 20KW gradually by 0, with the thermal equilibrium of the stable and reaction system that keeps plant process, it is overheated to prevent to react.
5. smelting process as claimed in claim 1, it is characterized in that: resulting TiNi shape memory alloy major ingredient is Ni and Ti, and the composition scope is Ni 50%-51at%, Ti 49-50% and based on the supplementary component of the total atom number of Ni and Ti: Cr is that 0～0.3at% or V are 0～0.5at%.
6. smelting process as claimed in claim 1 is characterized in that: gas content 0＜500ppm, N＜30ppm in the resulting TiNi shape memory alloy.
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| RU2792515C1 (en) * | 2022-08-26 | 2023-03-22 | федеральное государственное бюджетное образовательное учреждение высшего образования "Тольяттинский государственный университет" | Method for smelting nickel-titanium alloys |
| RU2806683C1 (en) * | 2022-12-23 | 2023-11-02 | Федеральное государственное бюджетное учреждение науки Институт металлургии и материаловедения им. А.А. Байкова Российской академии наук (ИМЕТ РАН) | METHOD FOR TWO-STAGE PRODUCTION OF TiMoNbZrAl Alloy |
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