The Properties And Application of Nitinol

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What is Nitinol ?
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%, and it’s fatigue life can reach 1*10-7th power. Its damping characteristics are also ten times greater than those of normal springs. It is an ideal material for applications in the medical field.

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 titanium and nickel. 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 (more significant than starting temperature: temperature of austenite) or when load 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, ductile and repeatable.
Nitinol application:

Clinical Application of Nitinol Wire

1. The first step in the treatment is to align and level the dentition of the patient. 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) archwires. The DEMON self-locking brace technology uses heat-activated, nickel-titanium alloy produced by Omro. O-PAK technology recommends using super-elastic Nitinol 0.016 inch archwires for early 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. The nickel-titanium spiral spring can generate about 50g of force when it is extended by one millimeter. 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 in a clinical setting. Respect the physiological requirements. Nitinol tension springs feature high elasticity with a small permanent deformation. When compared with stainless steel, the correction force released is about 3.5 to 4 times higher. The patient feels a dull, lasting pain during orthodontic treatment. The duration of the follow-up, treatment, and cure are reduced. This new device is excellent for orthodontic treatment.

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

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 Nitinol.