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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 nickel and titanium. 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 (as opposed to the same temperature: the temperature that austenite starts at) 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.
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, nickel-titanium alloy produced by Omro. O-PAK technology recommends that alloy archwire (phase-transition temperature is approximately 40 degrees) be used 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 widen gaps between teeth and move teeth in different directions. The nickel-titanium spiral spring can generate about 50g of force when it is extended by 1mm. 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. Meet physiological requirements. Nitinol tension springs feature high elasticity with a small permanent deformation. When compared with stainless steel, the correction force released is about 3.5-4x greater. The patient feels a dull, lasting pain during orthodontic treatment. The duration of the follow-up, treatment, and cure are reduced. It is a great new orthodontic device.
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.