| Parameters | Description |
|---|---|
| Material | Titanium and nickel |
| Tolerance | h7~h13/H10~H13 |
| Grade | Ti6Al7Nb Ti13Nb13Zr |
| Surface | Polished，Sandblasting |
Phase transition and properties of Nitinol
As the name suggests, Nitinol is a binary alloy composed of nickel ions and titanium ions. Due to changes in temperature and mechanical pressure, there are two different crystal phases, namely the austenite phase and the martensite phase (Martensite). The phase transition sequence of the nickel-titanium alloy during cooling is the parent phase (austenite phase)-R phase-martensite phase. The R phase is a rhombohedral shape, and the austenite is a state in which the temperature is higher (greater than the same: the temperature at which the austenite starts to be heated), or the state at which the load is removed (external force removal Deactivation), the cube is hard. The shape is relatively stable. The martensite phase is a state in which the temperature is relatively low (less than Mf: the temperature at which martensite ends) or loading (activated by an external force), hexagonal, malleable, repeatable, less stable, and easier Deformation. Therefore, it is clinically determined that the phase transition temperature of Nitinol archwire has a positive guiding significance so that clinicians can better utilize the performance of Nitinol for clinical orthodontic treatment.
Application
1. Used in super-elastic memory alloy mobile phone antennas, children’s toy antennas, optical frames, with the development of the times, gradually used in women’s corsets, as scientific research materials, frequently appear in various science and engineering college materials laboratory.
2. One-way shape recovery using a one-way shape memory effect. Such as pipe joints, antennas, collars, etc.
3. External cause two-way memory recovery. That is, the single-pass shape memory effect is used and repeated actions are performed with the external force with the temperature rise and falls, such as a heat-sensitive element, a robot, a binding post, and the like.
4. Super elastic application. Such as springs, binding posts, frames, etc. The memory alloy material frame is exemplified by a spring made of a memory alloy. The spring is placed in hot water, and the length of the spring is immediately elongated, and then placed in cold water, and it immediately returns to its original state. The shape memory alloy spring can be used to control the water temperature of the bathroom water pipe. When the hot water temperature is too high, the water supply pipe can be adjusted or closed by the “memory” function to avoid burns. It can also be used as a security device for fire alarm devices and electrical equipment. When a fire occurs, the spring made of the memory alloy is deformed, and the fire alarm device is activated to achieve the purpose of the alarm. It is also possible to place a spring made of a memory alloy in a heated valve to maintain the temperature of the greenhouse and to automatically open or close the heater valve when the temperature is too low or too high.
5. The biocompatibility of TiNi alloy is very good, and there are many medical examples using the shape memory effect and superelasticity. Such as thrombus filter, spinal orthopedic rod, orthodontic wire, cerebral aneurysm clip, bone plate, intramedullary nail, artificial joint, contraceptive, cardiac repair component, micropump for artificial kidney, etc.
Alloy |
Chemicalcomposition |
AF(Fully annealed) |
Min. elongation to failure [%] |
Max. Residualelongationafter 6%strain [%] |
Main Applications |
Standard |
|
SuperelasticNi-Ti alloy |
TiNi- SS |
Ti-50.8at % |
-5°C ± 5°C. |
10 |
0.1 |
Fishing line, Eyeglass Frames, Cellular Phone Antennae, Bra Underwire |
ASTMF 2063 |
TN3TNC |
TiNiVAlTiNiCr |
-40°C ~50°C |
10 |
0.1 |
|||
Normal temperatureNi-Ti alloy |
TiNi- YY |
Ti-50.7at %Ni |
Functional Af=33 ± 3 |
15 |
0.1 |
Implantable devices, Bone staplesVascular Stents |
|
Ti-Ni- 01 |
55.6~55.8 wt%Ni |
20 – 40 |
15 |
0.1 |
Guidewires, StentsOrthodontic Arches |
||
High-temperature Ni-Ti alloy |
Ti-Ni- 02 |
54.8~55.5wt%Ni |
45 – 95 |
10 |
0.1 |
Implantable active devices, Surgical tools, Thermostats Coffeepots |
|
TiNiCu |
TiNiCu |
As-Ms ≤ 5 |
10 |
0.1 |
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