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Characteristics and principles of Nitinol alloy powder

2023-07-28 17:13:52  News

Overview of Nitinol alloy NiTi powder

Nitinol, also known as Nitinol, is a metal alloy of nickel and titanium, in which the atomic percentages of the two elements are approximately equal. Different alloys are named according to the weight percentage of nickel (such as nickel). Nitinol 55 and Nitinol 60. Show shape memory effect and super elasticity at different temperatures.

Nitinol is a shape memory alloy, a special alloy that can automatically restore plastic deformation to its original shape at a certain temperature. The expansion rate exceeds 20%, the fatigue life is 7 times that of 1*10, and the damping characteristic is 10 times. Compared with ordinary springs, its corrosion resistance is better than the best medical stainless steel at present, so it can meet a variety of engineering requirements and is an excellent functional material that can meet the needs of medical applications.

In addition to its unique shape memory function, memory alloy also has excellent properties such as wear resistance, corrosion resistance, high damping, and super elasticity.

Nitinol has two closely related and unique properties: shape memory effect and superelasticity (also known as pseudoelasticity). Shape memory is the ability of Nitinol to deform at a certain temperature, maintain its deformed shape after the external force is removed, and then return to its original shape. It does not deform when heated above its "transition temperature". Superelasticity is the ability of a metal to withstand large deformations and immediately restore its undeformed shape after the external load is removed. The deformation of Nitinol is 10 to 30 times that of ordinary metals and can restore its original shape. Whether Nitinol alloy shows shape memory effect or superelasticity depends on whether it is higher than the transition temperature of the specific alloy. Below the transition temperature, it exhibits a shape memory effect.

Characteristics and principles of Nitinol alloy NiTi powder

1. Shape memory characteristics (shape memory) 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. With the reverse phase change, the material will automatically restore its shape in the parent phase. In fact, the shape memory effect is a thermally induced phase transformation process of Nitinol.

2. Superelastic (superelastic) The so-called superelastic refers to the phenomenon that the sample produces a strain much larger than the elastic limit strain under the action of external force, and the strain can automatically recover when unloaded. That is, in the matrix state, due to the action of the applied stress, the stress-induced martensitic transformation occurs, so that the alloy exhibits a mechanical behavior different from that of ordinary materials. Its elastic limit is much greater than that of ordinary materials, and it no longer complies with Hu K’s law. Compared with shape memory properties, superelasticity has no thermal involvement. In a word, superelasticity means that the stress does not increase with the increase of strain within a certain deformation range. Superelasticity can be divided into linear superelasticity and nonlinear superelasticity. In the former stress-strain curve, the relationship between stress and strain is close to linear. Nonlinear superelasticity refers to the result of stress-induced martensitic transformation and its reverse phase transformation during loading and unloading in a certain temperature range above Af. Therefore, nonlinear superelasticity is also called phase transformation pseudoelasticity. The phase change pseudo-elasticity of Nitinol can reach about 8%. The superelasticity of nickel-titanium alloy can change with the change of heat treatment conditions. When the archwire is heated above 400°C, the superelasticity begins to decrease.

3. 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. The corrective force of the super-elastic nickel-titanium alloy orthopedic wire changes with the change of the oral cavity temperature. When the amount of deformation is constant. As the temperature rises, the corrective force increases. On the one hand, it can accelerate the movement of teeth. This is because temperature changes in the oral cavity will stimulate the blood flow in the stagnant blood flow caused by the orthodontic device, so that the repair cells are fully nourished during the tooth movement. Maintain its vitality and normal function. On the other hand, orthodontists cannot precisely control or measure the orthodontic force in the oral environment.

4. Corrosion resistance: studies have shown that the corrosion resistance of nickel-titanium wire is similar to that of stainless steel wire

5. Anti-toxicity: Nitinol shape memory alloy has a special chemical composition, that is, it is an atomic alloy such as nickel-titanium, containing about 50% nickel, and nickel is known to have carcinogenic and cancer-promoting effects. Under normal circumstances, the surface layer of titanium oxide acts as a barrier, so that Ni-Ti alloy has good biocompatibility. TiXOy and TixNiOy in the surface layer can inhibit the release of Ni.

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. Regarding the load-displacement curves of these orthodontic wires under tensile test and three-point bending test conditions. The unloading curve platform of Nitinol is the lowest and the flattest, indicating that it can provide the most durable and soft correction force.

7. Good shock absorption characteristics: The greater the vibration caused by chewing and night molars to the arch wire, the greater the damage to the root and periodontal tissues. Through the results of different arch wire attenuation experiments, it is found that the vibration amplitude of stainless steel wire is larger than that of super-elastic Ni-Ti wire. The initial vibration amplitude of super-elastic Ni-Ti arch wire is only half of that of stainless steel wire. The health of teeth is very important, and traditional arch wires, such as stainless steel wires, tend to increase root resorption.

Such special characteristics of Nitinol alloy come from a reversible solid phase transformation called martensitic transformation. Between two different phase transformation crystal phases, mechanical stress of 10,000 to 20,000 psi can be generated.

Application of Nitinol Alloy  NiTi Powder

Nitinol  NiTi powder can meet the needs of various engineering and medical applications and is an excellent functional material. In addition to its unique shape memory function, memory alloy also has excellent functions such as wear resistance, corrosion resistance, high damping and super elasticity.

The tensile strength of Nitinol can reach 1000 MPa, which means that it takes more than 100 dry grams per square millimeter to destroy it. This force is stronger than ordinary steel, and it also has good "memory" performance and corrosion resistance.

Nitinol alloy contains 50% nickel and 50% titanium, that is, nickel and titanium are equally divided, each accounting for half. The temperature range of the shape memory can be adjusted by the control element. Generally, the higher the nickel content, the lower the working temperature. When it contains 55% nickel and 45% titanium, the memory alloy can work at room temperature.

People made use of this characteristic of shape memory alloy to make pearl necklaces and bracelets made of shape memory alloy wire, and bras made of shape memory alloy wire. Wearing these decorations and health products on the body will restore the original curvature and rigidity under the action. Body temperature, which plays a role in decoration and health care. In addition, you can also use nickel-titanium alloy to make orthodontic wires to correct deformed teeth according to the body's oral temperature.

Nitinol  NiTi power can be used to replace traditional actuators (solenoid valves, servo motors, etc.), such as the simple hexapod robot Stiquito.

Nitinol springs are used in fluid thermal valves, and their materials can be used as temperature sensors and actuators.

The alloy is used as an auto-focus actuator in sports cameras and an optical image stabilizer in mobile phones.

Alloys are used in pneumatic valves to obtain a comfortable seat, which has become an industry standard.

The alloy Chevrolet Corvette contains a nickel-titanium memory alloy actuator, which replaces the heavier electronic transmission, used to open and close the hatch to release air from the torso, making it easier to access.

Nitinol  NiTi powder price

The price of Nitinol NiTi  powder varies randomly with changes in production costs, transportation costs, international conditions, exchange rates, and the supply-demand relationship of the Nitinol  NiTi powder market. Tanki New Materials Co., Ltd. aims to help various industries and chemical wholesalers find high-quality, low-cost nanomaterials and chemicals by providing a full set of customized services. If you are looking for Nitinol alloy NiTi  powder materials, please feel free to contact to get the latest price of Nitinol alloy NiTi  powder.

Nitinol powder supplier

As a global nitinol  NiTi powder supplier, Tanki New Materials Co.,Ltd.has extensive experience in the performance, application and cost-effective manufacturing of advanced engineering materials. The company has successfully developed a series of powder materials (including water-based stearic acid emulsion, water-based calcium stearate, zinc stearate, etc.), high-purity targets, functional ceramics and structural devices, and provides OEM services.

If you are looking for high-quality Nitinol alloy NiTi powder, please feel free to contact us and send an inquiry. ( sales@ozbo.com ).


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