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 the parent phase for a particular shape is cooled to below Mf temperatures from above Af temperatures. This martensite is then deformed and heated back to Af. When the material undergoes a reverse phase shift, it will automatically restore the shape of the parent phase. In reality, the Nitinol phase change process that causes 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. 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 of temperatures above Af. The nonlinear pseudoelasticity is called phase-transformation pseudoelasticity. Nitinol’s phase-change pseudoelasticity can be as high as 8%.

3. Sensitivity of orthodontic wires to temperature changes: The orthodontic power and CoCr alloy orthopaedic wires are 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 will cause the blood to flow more freely, 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 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 alloys biocompatible. TiXOy, TixNiOy and TixNiOy on the surface 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. Different arch wire experiments have shown that the amplitude vibration of stainless steel is higher than that of super elastic Ni-Ti. The initial vibratory amplitude for super-elastic NiTi wire is less than half that of stainless wire. Traditional archwires, like stainless steel, can increase root resorption.

Tech Co., Ltd. is a professional 3D printing Powders We are a chemical product supplier with 12 years of experience. We accept payment by Credit Card, T/T (West Union), Paypal and T/T. The goods will be shipped to overseas customers via FedEx or DHL.

You can contact us for high-quality nitinol. Contact us Send an inquiry.