Nitinol Shape memory alloys are special alloys that have good plasticity and can restore their original shape automatically at a given temperature.
Nitinol alloy is a form memory alloy. It is a unique alloy that is capable of restoring its plastic deformation back to its original state at a specified temperature. Its expansion rate exceeds 20%, its damping characteristics are ten times greater than those of ordinary springs and it has a corrosion resistance that is superior to the best medical stainless-steel at the moment. It is one of the best functional materials.

The memory alloy is not only unique for its shape memory, but it also offers excellent wear resistance and corrosion resistance. It has high damping properties, too.

Nitinol Powder Special Properties

1. Shape memory properties (shape-memory) Shape memory is formed when the parent of a shape is cooled to below Mf temperatures from above Af temperatures. This martensite phase is then deformed and heated back to Af. When the material undergoes a reverse phase shift, it will automatically return to the original parent phase. The Nitinol phase change process that causes the shape memory is thermally induced.

2. Superelasticity When a force is applied to the sample, it can cause a strain greater than the elastic limit strain. The strain will automatically return when the external force is removed. In comparison with shape memory, superelasticity does not involve thermal energy. Superelasticity, in a nutshell, means that stress doesn’t increase with strain increase within a specific deformation range. The superelasticity can be classified into linear and nonlinear. Nonlinear superelasticity is the resultant of stress-induced martensitic phase transformations and their reverse phase transformations during loading and releasing in a certain range above Af. The nonlinear pseudoelasticity is called phase-transformation pseudoelasticity. Nitinol’s phase-change pseudo-elasticity can reach 8%.

3. Temperature in the Oral Cavity: The orthodontic power of CoCr alloy orthoptic wire and stainless steel wire is not affected by temperature in the Oral Cavity. The temperature in the oral cavity affects the corrective force of super-elastic Nickel-Titanium alloy orthodontic wire. When the amount deformation is constant. Corrective force increases with temperature. On one hand, the temperature can increase the speed of tooth movement. The temperature changes within the oral cavity stimulates blood flow, thereby nourishing the repair cells during tooth movement. Maintain vitality and normal functions. Orthodontists are unable to precisely measure or control orthodontic forces in the oral environment.

4. The corrosion resistance of Nickel-Titanium Wire is comparable to that of stainless Steel Wire.

5. Anti-toxicity – Nitinol, the shape memory metal, has a chemical composition that is unique. It’s an atomic alloy, similar to nickel-titanium and contains about 50% of nickel. Nickel is well known for its carcinogenic properties and can promote cancer. In normal circumstances, titanium oxide on the surface acts as barrier. This makes Ni-Ti alloy biocompatible. TiXOy, TixNiOy, and TixNiOy are surface layers that can inhibit Ni release.

6. 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 ss-titanium alloy wires. These orthodontic wires have been tested in tensile and three-point bend tests. Nitinol’s unloading platform is the lowest, flattest and the lowest of all the orthodontic wires. It can therefore provide the strongest and most flexible correction force.

7. The root and periodontal tissue are more damaged by arch wires with good shock absorption properties. Through different archwire attenuation studies, it was found that the vibratory amplitude of the stainless steel wire was greater than that of the super-elastic nickel-ti wire. The initial vibratory amplitude for super-elastic Ni Ti arch wire is less than half that of stainless wire. The health of your teeth is important. Traditional archwires, like stainless steel wires can increase root resorption.

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