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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%, 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 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 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 (as opposed to the temperature where austenite begins) 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, ductile and repeatable.
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) archwire. The DEMON self-locking brace technology uses heat-activated heat-activated Nitinol-Titanium made by Omro. O-PAK technology recommends 0.016 inch super-elastic Nitinol alloy archwire as early alignment wire.
2. Nitinol extension and push springs: These 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 pull teeth into 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 the physiological needs. Nitinol tension springs feature high elasticity with a small permanent deformation. The correction force released by stainless steel wires with the same diameter 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. 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 Nitinol.