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Vacuum induction smelting process of Ti-Ni and Ti-Ni-Nb marmem

A technology of memory alloy and vacuum induction, which is applied in the field of vacuum metallurgy, can solve the problems of affecting the cold working performance of high-temperature deformed materials, affecting the performance of alloy phase transition point, and affecting the performance of alloy phase transition point and performance, so as to achieve excellent high-temperature deformation performance and equipment The effect of low cost and convenient operation

Inactive Publication Date: 2004-09-01
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Ti-Ni and Ti-Ni-Nb shape memory alloys have strong activity. The existing vacuum metallurgy technology (such as electron beam, water condensation shell, vacuum induction melting of graphite crucible) melts such alloys. The technical difficulty is: the main component of the alloy Inaccurate control and carburization will affect the performance of the alloy's phase transition point (usually the composition deviation is 0.5 weight percent, which seriously affects the phase transition point and performance of the alloy); in addition, using conventional MgO and Al with poor thermodynamic stability 2 o 3 Crucible smelting of this type of active alloy, due to the strong reaction between the active molten T' and the above-mentioned crucible material, the increase of oxygen in the alloy smelting process, the ingot thermal processing performance deteriorates, and also affects the cold processing performance of high-temperature deformed materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] CaO crucible is used to prepare Ti-Ni alloy. The specific process is: charging→vacuumizing→alloy melting period→alloy refining period→alloy liquid condensation→adjusting temperature and pouring alloy ingot. The operation steps are as follows:

[0020] 1. Charging of alloy raw materials: take the raw material 0 according to the weight ratio of Ti44Ni56 # -Ti and 1 # -Ni, the charging sequence is: Ni and 20% Ti are loaded into the crucible, and the remaining 80% Ti and strong deoxidizer Ca are added into the alloy hopper;

[0021] 2. Vacuuming: when the pressure in the furnace is evacuated to 1.5Pa, fill it with argon to 0.03MPa;

[0022] 3. Alloy melting: power transmission, melting and loading of raw materials in the crucible, when the material in the crucible is melted, add the remaining 80% Ti to the crucible, stirring intermittently; the purpose of stirring is to prevent the low-density Ti from floating on the surface after melting The upper part of the alloy liqui...

Embodiment 2

[0041] The difference from Example 1 is:

[0042] To prepare Ti-Ni-Nb alloy, the operation steps are as follows:

[0043] 1. Charging of alloy raw materials: take raw material 1 according to weight ratio Ti36.96-Ni48.38-Nb14.66 # -Ni, Nb-1, 0 # -Ti, the charging sequence is: Ni, Nb and 20% of Ti are loaded into the crucible, and the remaining 80% of Ti and strong deoxidizer Ca are added into the alloy hopper;

[0044] 2. Vacuuming: when the pressure in the furnace is evacuated to 1.2Pa, fill it with argon to 0.05MPa;

[0045] 3. Alloy melting: power transmission, melting and loading of raw materials in the crucible, when the material in the crucible is melted, add the remaining 80% Ti to the crucible, stirring intermittently; the purpose of stirring is to prevent the low-density Ti from floating after melting The upper part of the alloy liquid reacts with the crucible;

[0046] 4. Alloy refining: After clearing, the alloy liquid is refined at a temperature higher than the ...

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Abstract

The process for vacuum inductively-smelting Ti-NI and Ti-Ni-Nb marmen adopts CaO crucible to smelt alloy includes the following steps: according to the required ratio of alloy charging furnace; for Ti-Ni alloy, charging Ni and 15-25% of Ti into crucible, and adding the residual 75-85% of Ti and deoxidant Ca into alloy charging hopper; and for Ti-Ni-Nb alloy, charging Ni, Nb and 20% of Ti into the crucible and adding the residual 75-85% of Ti and strong deoxidant Ca into alloy charging hopper, evacuating to make pressure of furnace interior be less than 2Pa, charging argon gas to 0.3-0.6 atm range, powering-on, after the materials are dissolved, adding residual 75-85% of Ti into the crucible, stirring and refining for 10-20 min. at 20-100 deg.C higher than melting point of alloy, adding Ca, regulating molten alloy temp., pouring so as to obtain Ti-Ni and Ti-Ni-Nb marmen ingot casting.

Description

technical field [0001] The invention belongs to the field of vacuum metallurgy, in particular to a process for vacuum induction melting pure Ti-Ni and Ti-Ni-Nb shape memory alloys. Background technique [0002] Ti-Ni and Ti-Ni-Nb shape memory alloys have strong activity. The existing vacuum metallurgy technology (such as electron beam, water condensation shell, vacuum induction melting of graphite crucible) melts such alloys. The technical difficulty is: the main component of the alloy Inaccurate control and carburization will affect the performance of the alloy's phase transition point (usually the composition deviation is 0.5 weight percent, which seriously affects the phase transition point and performance of the alloy); in addition, using conventional MgO and Al with poor thermodynamic stability 2 o 3 Crucible smelting of this type of active alloy, due to the strong reaction between the active molten T' and the above-mentioned crucible material, the increase of oxygen i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22C19/03
Inventor 高明刘奎马颖澈张顺南张晋德
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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