Special Properties of Nitinol Powder


Jun 29, 2023

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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 original shape when heated to a certain degree. 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 occurs when a parent phase is cooled to a temperature lower than Mf from above Af. This martensite can then be 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 a sample, it can cause tensile strains that are much greater than the elastic limit strain. The strains will automatically return when the external force is removed. In comparison with shape memory, superelasticity does not involve thermal energy. In other words, superelasticity means the stress doesn’t increase with strain in a specific range of deformation. The superelasticity can be classified into linear and nonlinear. Nonlinear superelasticity is the resultant of the stress-induced martensitic phase transformation, and its reversal during loading and releasing in a certain range above Af. The nonlinear pseudoelasticity can be referred to as phase transformation superelasticity. Nitinol’s phase-change pseudoelasticity can be as high as 8%.

3. Temperature in the Oral Cavity: The orthodontic power of CoCr alloy orthoptic wire and stainless steel wire is not affected by temperature changes. 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 control and measure the orthodontic forces in the oral environment.

4. The corrosion resistance of Nickel-Titanium Wire is comparable to stainless steel wire.

5. Anti-toxicity – Nitinol, the shape memory metal, has a chemical composition that is unique. It’s an atomic-alloy, like nickel-titanium. Nickel, however, is known for its carcinogenic properties. In normal conditions, the titanium oxide surface layer 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 lowest. It can therefore provide the most durable soft correction force.

7. Good shock-absorption properties: The greater vibration caused by the chewing and the night molars on the archwire, the more damage will be done to the periodontal tissue and the roots. 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 NiTi wire is less than half of that of stainless-steel wire. The health of your teeth is important. Traditional archwires, like stainless steel wires can increase root resorption.

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