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Technique for smelting ultra-pure TiNi shape memory alloy

A technology of memory alloy and alloy, which is applied in the field of material metallurgy, can solve the problems of being general, not fully considering the special process of Ni and Ti, and being unable to prevent Ti reaction, etc.

Inactive Publication Date: 2008-05-28
沈阳天贺新材料开发有限公司
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  • Abstract
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Problems solved by technology

[0015] However, the applicant found that although the oxygen content in the TiNi alloy can be partially reduced only by using the CaO crucible, the effect is still ideal, because although the CaO crucible can reduce the introduction of oxygen into the reaction system by itself, due to the extreme activity of Ti in the alloy, and The irreversibility of the compound formed by the reaction of oxygen and Ti cannot prevent the reaction of Ti with oxygen due to its own reasons during the reaction process, such as the inevitable decomposition of impurity oxygen and water vapor in the crucible, etc.
There are some reports in the prior art that use CaO crucibles for memory alloy smelting, but the applicant found that the process disclosed in the prior art is too general and ambiguous, and it is still difficult to obtain high performance in the actual smelting process only based on the described steps. The reason is that due to the intense reaction of TiNi alloy, in the smelting process of TiNi memory alloy, not only the selection of the crucible is also very important for the control of the smelting process
Although the above-mentioned technical scheme adopted in the prior art adopts the CAO crucible to intelligently control part of the gas content, it does not fully consider the special process of Ni and Ti reaction itself, so that it cannot effectively control the oxidation of TI caused by overheating; the present invention thus overcomes the The above-mentioned defects, after a large number of tests, analyzes and summaries, corresponding improvements have been made to the process, process steps, process conditions, etc., so that the smelting process can overcome the deficiencies of the above-mentioned documents, and better obtain high-performance TiNi memory alloys

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  • Technique for smelting ultra-pure TiNi shape memory alloy

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Effect test

Embodiment 1

[0046] TiNi shape memory alloy ingots are obtained by ultra-pure smelting of TiNi shape memory alloys. CaO crucibles are used to prepare TiNi shape memory alloy ingots. The specific process:

[0047] 1. Raw material charging, according to the designed composition ratio Ti49.15Ni50.85 atomic ratio to take raw materials, No. 0 Ti and No. 1 Ni, the order of charging is that Ni and 40% Ti are loaded into the crucible at the same time, and the remaining 60% Ti Put it in the hopper for later use.

[0048] 2. Vacuumize to 0.13Pa, flush with argon to 0.08MPa.

[0049] 3. The alloy is melted, and the power is sent to 30kw-20kw-0kw, and the heating is reduced to keep the reaction heat balance of the system and stir evenly.

[0050] 4. Vacuumize, feed the spare 60% Ti in the hopper into the crucible, and flush with argon.

[0051] 5. Power transmission heating, increase the heating power from 0-20KW, keep the reaction heat balance of the system, and stir.

[0052] 6. Alloy refining, r...

Embodiment 2

[0055] TiNiCr shape memory alloy ingots are obtained by ultra-pure smelting of TiNi shape memory alloys. CaO crucibles are used to prepare TiNi shape memory alloy ingots. The specific process:

[0056] 1. Raw material charging, take the raw material according to the designed composition ratio (%) Ti49.15Ni50.85Cr0.3 atomic ratio (the meaning of Cr0.3 is based on the ratio of Ti+Ni=100%at is 0.3%at), 0 No. Ti and No. 1 Ni, the order of charging is that Ni and 40% Ti0.3% Cr are loaded into the crucible at the same time, and the remaining 60% Ti is put into the hopper for standby.

[0057] 2. Vacuumize to 0.13Pa, flush with argon to 0.08MPa.

[0058] 3. The alloy is melted and sent to 30kw1-20kw-0kw, and the heating is reduced to keep the reaction heat balance of the system and stir evenly.

[0059] 4. Vacuumize, feed the spare 60% Ti in the hopper into the crucible, and flush with argon.

[0060] 5. Power transmission heating, 0-20KW increments, keep the system reaction heat b...

Embodiment 3

[0064] TiNiV shape memory alloy ingots are obtained by ultra-pure smelting of TiNi shape memory alloys. CaO crucibles are used to prepare TiNi shape memory alloy ingots. The specific process:

[0065] 1. Raw material charging, take the raw material according to the designed composition ratio (%) Ti49.15Ni50.85V0.5 atomic ratio (the meaning of V0.5 is based on the ratio of Ti+Ni=100%at is 0.5%at), 0 No. Ti and No. 1 Ni, the charging sequence is that Ni and 40% Ti are loaded into the crucible at the same time, and the remaining 60% Ti is put into the hopper for standby.

[0066] 2. Vacuumize to 0.13Pa, flush with argon to 0.08MPa.

[0067] 3. Alloy melting and power transmission 30kw-20kw-0kw, decreasing heating, stirring evenly.

[0068] 4. Vacuumize, feed the spare 60% Ti in the hopper into the crucible, and flush with argon.

[0069] 5. Electric heating, 0-20KW increments, stirring.

[0070] 6. Alloy refining, refining at 1300-1400 degrees for 5 minutes, solidifying the sh...

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Abstract

The invention relates to an ultra-pure smelting process of TiNi shape memory alloy, in particular to an ultra-pure smelting process used in TiNi shape memory alloy. As the TiNi shape memory alloy is a material which highly demands the accuracy of components, wherein the change of the Ni content can lead to the change of transformation temperature of 10 to 20 DEG C, the content of foreign matters should be controlled as 0<500ppmN<30ppm, thereby the material can have the perfect super-elasticity, and the accurate transformation temperature can be achieved according to the components.

Description

1. Technical field [0001] The invention belongs to the field of material metallurgy, and designs a method for ultra-pure smelting of TiNi shape memory alloys. Specifically, it is suitable for the process method of controlling accurate composition of TiNi shape memory alloy. 2. Background technology [0002] The shape memory effect of TiNi memory alloy is realized through martensitic phase transformation. Therefore, controlling the martensitic transformation temperature of the alloy is the key to producing this alloy. In TiNi memory alloy, the most sensitive elements to martensitic transformation temperature are C, N, O, and it is difficult to strictly control these elements in this alloy. [0003] Ti in TiNi alloy belongs to group IVB in the periodic table. It is a strong metallic element and is particularly active. It has a strong tendency to combine with non-metallic O, N, and C, which brings great benefits to the production of high-quality TiNi alloys. big difficulty. ...

Claims

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Application Information

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IPC IPC(8): C22C1/02C22C14/00B22D21/00
Inventor 高淑春廖波郑志
Owner 沈阳天贺新材料开发有限公司
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