Performance And Property of Nitinol- A Metal with Memory
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Update time : 2020-11-09 10:58:33
Nitinol is shape memory alloy, which is a special alloy that can automatically restore its plastic deformation to its original shape at a certain temperature, and has good plasticity.
In addition to the unique shape memory function, memory alloys also have excellent characteristics such as wear resistance, corrosion resistance, high damping and super elasticity.
1.What is Performance of Nitinol?
As the name suggests, nickel-titanium alloy powder is a binary alloy powder composed of nickel and titanium. Due to changes in temperature and mechanical pressure, there are two different crystal structure phases, namely austenite phase and martensite phase. The phase transformation sequence of nickel-titanium alloy cooling is parent phase-R phase-martensite phase. The R phase is rhombohedral, and the austenite is cubed and hard when the temperature is high or when the load is removed. The shape is relatively stable. The martensite phase is a state at a relatively low temperature or under loading. It has a hexagonal shape and is ductile, repeatable, unstable, and easily deformed.
2.What is Special property of Nitinol? Shape memory characteristics: Shape memory is when the parent phase of a certain shape is cooled from above Af temperature to below Mf temperature to form martensite, the martensite is deformed at a temperature below Mf, and heated to below Af temperature, accompanied by reverse phase transformation. The material will automatically restore its shape in the parent phase.
Superelasticity: The so-called superelasticity refers to the phenomenon that the sample produces a strain much larger than its elastic limit strain under the action of external force, and the strain can automatically recover when unloaded.
Sensitivity to temperature changes in the oral cavity: the orthodontic power of stainless steel wire and CoCr alloy orthopedic wire is basically not affected by the temperature in the oral cavity.
Corrosion resistance: Studies have shown that the corrosion resistance of nickel-titanium wire is similar to that of stainless steel wire.
Anti-toxicity: Nitinol shape memory alloy has a special chemical composition, that is, it is an atomic alloy such as Nitinol, containing about 50% nickel, and nickel is known to have carcinogenic and cancer-promoting 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 absorption characteristics: The greater the vibration of the arch wire due to chewing and night molars, the greater the damage to the root and periodontal tissue.
Luoyang Trunnano Tech Co., Ltd (TRUNNANO) is a professional Nitinol Powder with over 12 years experience in chemical products research and development. If you are looking for high quality Nitinol Powder, please feel free to contact us and send an inquiry.
