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Nitinol: What is it?
Nitinol alloy is a form memory alloy. It is a unique alloy that automatically returns to its original shape when heated at a specified temperature. Its expansion rate exceeds 20%, its fatigue resistance is 1*10 up to the 7th order, its damping qualities are ten-times higher than those of ordinary springs and its corrosion resistant is better than any medical stainless steel currently available. It is a functional material that meets the requirements of medical applications.

Memory alloy has a unique ability to remember its original shape. It also offers excellent wear resistance and corrosion resistance.

Nitinol and its properties

Nickel-titanium is a binary metal alloy made of nickel and titan. There are two distinct crystal phases due to changes in temperature or mechanical pressure: austenite and Martensite. The nickel-titanium phase transformation sequence is: parent phase (austenite), R phase, martensite phase. The R phase is cubic. Austenite is harder and cubic at higher temperatures (significantly more than the starting temperature of austenite) or when the external force (Deactivation) is removed. The shape of the austenite is relatively stable. The martensite is formed when the temperature falls below Mf (the temperature at which martensite finishes) or is activated by external forces. It is hexagonal in shape, repeatable and not stable.
Nitinol application:

Clinical Application of Nitinol Wire

1. It is used to align and level the teeth of patients as early as possible. Nitinol Archwires, with their superelasticity and shape-memory properties and lower stress/strain curves, are used in the first stage of treatment. The patient’s discomfort is reduced significantly. MBT’s straight wire correction technology uses heat-activated Nickel-Titanium alloy (HANT) archwire. The DEMON self-locking brace technology uses heat-activated heat-activated Nitinol-Titanium produced Omro. O-PAK technology recommends using super-elastic Nitinol 0.016 inch archwire for early levelling and alignment.

2. Nitinol extension and push springs are used in orthodontics. These springs are very elastic and can be used for orthodontic treatments to open the gap in between teeth, and to pull teeth into different directions. When the coil spring is extended by one millimeter, it can generate about 50g of force. Nickel-titanium coil springs possess high elastic properties, and they can create a soft and stable pressure while under tension. The force attenuation of the coil springs is minimal. This makes them ideal for orthodontic forces that are required to move teeth clinically. Meet the physiological needs. The springs made of Nitinol have a high degree of elasticity, and a small rate permanent deformation. The correction force released by stainless steel wires with the same diameter is about 3.5-4x greater. The patient feels a dull, lasting pain during orthodontic treatment. The duration of the follow-up, treatment, and cure are reduced. It is an excellent mechanical device used in orthodontic treatment.

Nitinol’s excellent properties in terms of electrical, mechanical and thermal properties make it a popular choice in the semiconductor electronic packaging industry.

Tech Co., Ltd. () has over 12 years’ experience in research and development of chemical products. You can send us an inquiry if you need high-quality Nickel.

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