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This is a type of shape memory metal and it’s used in 3D printers. Shape memory alloys have a good plasticity and can be reformed to their original form at a given temperature.
Nitinol alloy is made up of two metals, titanium and nickel. The austenite phase, and the martensite, are different phases of crystallization due to temperature and mechanical stress changes. The nickel-titanium metal alloy has many other excellent properties, such as corrosion resistance, super elasticity, high damping capacity, and wear resistance.
Nitinol Powder Performance
1. Shape memory
The material automatically returns to its mother phase when it undergoes a reverse phase transformation. It is true that the shape memory process is a thermally initiated phase transformation of Nitinol.
Superelasticity refers the phenomenon of a sample producing a larger strain than its elastic limits strain when under external force. This strain is automatically restored upon unloading. It is the case that, when the parent phase is in its state, the martensitic transformation due to stress occurs. This results in a different mechanical behavior than ordinary materials.
3. Sensitivity in the mouth to temperature changes
The temperature in the mouth cavity does not affect the correction force of CoCr alloy wire or stainless steel wire. The temperature in the oral cavity affects the corrective force of super-elastic nickel titanium alloy orthopedic wire.
4. Corrosion resistance
According to recent studies, the corrosion resistance between stainless steel wire and nickel-titanium cable is very similar.
This alloy is a nickel-titanium atomic alloy, which is about 50% Nickel. Nickel has been known to be carcinogenic, causing cancer. In normal circumstances, titanium oxide on the surface acts as barrier. This makes Ni-Ti alloy biocompatible. TiXOy, TixNiOy and TixNiOy on the surface can inhibit Ni release.
6. Corrective correction
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 ss titanium alloy wires. Nitinol has the lowest unloading curve and flattest platform, meaning it is the best for providing a soft and durable correction force.
7. Good shock absorption properties
The root and periodontal tissue is more damaged by the higher the vibration caused by the archwire. Through different archwire attenuation studies, it was found that the vibration of stainless steel is greater than that of super elastic Ni-Ti. The initial vibratory amplitude of Ni-Ti super-elastic arch wire is half of the stainless steel wire. The health of teeth is extremely important.
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