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Memory alloys have excellent wear resistance and corrosion resistance characteristics, as well as super-elasticity, high damping capacity, and high damping.
What is Nitinol Performance?
As its name implies, nickel-titanium powder is a binary metal powder that is composed of both nickel and titanium. The austenite phase, and the martensite phases are different due to changes in temperature or mechanical pressure. The order of phase transformation in cooling nickel-titanium is parent phase – R phase – martensite. The R phase has a rhombohedral shape, while the austenite cubes become hard and brittle when temperatures are high or the load is removed. The shape of the material is stable. The martensite is the state of a material at relatively low temperatures, or under loads. It is hexagonal, ductile and repeatable. It’s also unstable and easily bent.
What are the special properties of Nitinol?
Shape memory: Shape memory occurs when a parent phase is cooled to below Mf from above Af. This martensite phase is then deformed and heated back to Af. The material will automatically revert to its parent phase.
Superelasticity: The term superelasticity describes the phenomenon in which a sample is strained beyond its elastic limit strain when subjected to external forces, but the strain automatically returns after the force has been removed.
Sensitivity of orthodontic wires to temperature changes: The orthodontic power and strength of CoCr orthopedic wires is not significantly affected by temperature.
Corrosion resistance According to recent studies, the corrosion resistance between stainless steel and nickel-titanium is almost identical.
Anti-toxicity: Nitinol has a special composition. This is because it is an atomic-alloy, such as Nitinol. Nickel contains approximately 50% and is known for its carcinogenic effects.
Gentle orthodontic power currently commercially used orthopedic wires include austenitic stainless steel wires, cobalt-chromium-nickel alloy wires, nickel-chromium alloy wires, Australian alloy wires, gold alloy wires and nickel-titanium alloy wires.
Good shock-absorbing characteristics: The greater vibrations of the archwire due to chewing or night molars will cause more damage to the roots and periodontal tissues.
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