Knowledge - Baoji hanz

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How can you program or train a Nitinol wire to remember a shape?

The setting of Nitinol wire usually requires heating it to a specific temperature (austenite surface treatment temperature). The wire is first transformed into the desired shape and then heated and cooled in a controlled process. This thermal cycle allows the wire to "remember" the shape through phase transitions between the martensite and austenite phases. The specific temperature and time parameters need to be carefully calibrated according to the characteristics of the alloy.

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What is shape memory Nitinol wire used for?

Shape memory Nitinol wires are used in medical devices like stents to open blocked blood vessels. They are also used in orthodontic wire to correct tooth alignment, as they can return to their original shape and apply gentle, consistent force. In robotics, these wires help design flexible drives for more adaptive motion.

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What is shape memory nitinol wire, and how does it work?

Nickel titanium shape memory wire is a kind of wire made of nickel titanium alloy. It has an extraordinary ability to "remember" and return to a predetermined shape after being deformed.
This wire operates according to a phase change mechanism. At lower temperatures, it is in the martensitic phase and can bend or deform. When heated above a certain transition temperature (austenite completion temperature), it returns to its original shape when it transforms into an austenitic phase. The change in crystal structure during the phase transition allows the wire to regain its memory shape.

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How does a super elastic nitinol guide wire work?

The working principle of Nitinol guides is based on their superelastic and shape memory properties. They can be bent and shaped to fit through the body's complex anatomy, such as blood vessels or catheters. The wire is inserted and guided to the target area, its flexibility allows it to follow the path, while its stiffness provides enough pushability to reach the destination, helping to locate other medical devices or provide treatment.

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What are the applications of superelastic nitinol wire in the medical field?

Super elastic nitinol wires are widely used in orthodontics for dental braces due to their ability to apply constant force and return to their original shape. They're also used in some medical devices like stents to provide support and flexibility in the body's vessels or ducts.

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What is the typical lifespan of a nitinol guide wire?

The typical service life of a nitinol guide wire depends on various factors such as usage frequency, application, and operating conditions. In minimally invasive procedures like angioplasty, it can usually last for a single procedure or a few uses if properly sterilized and maintained, generally ranging from several minutes to a few hours per use.

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How is nitinol foil manufactured?

Shape memory nitinol foil are usually manufactured through techniques like sputtering. In sputtering, high - energy particles bombard a nickel - titanium target, ejecting atoms which then deposit on a substrate to form a thin film. Another method is evaporation, where the nickel titanium material is heated to vaporize and then condensed onto a surface to create the thin film.

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What is the elastic modulus of nitinol wire?

The elastic modulus of nickel titanium wire varies depending on the phase state it is in, as follows:
- Austenite: The elastic modulus is generally 75-83GPa.
- Martensite: The elastic modulus is usually between 28 and 40GPa.

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What is a super elastic nitinol guide wire?

Superconductivity of nitinol wire refers to the property that the wire can conduct electricity with zero electrical resistance under certain extremely low - temperature conditions.

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How is nitinol wire manufactured and processed?

Shape memory nitinol wire is usually obtained by a process such as vacuum induction melting. Then, hot processing, such as forging and rolling, is carried out to form it into wire. The diameter is then reduced to the desired size using a drawing technique. Machining operations such as cutting and bending can be further performed to meet specific requirements. Heat treatment is also an important step in optimizing its shape memory and superelastic properties.

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How does shape memory Nitinol wire work?

Shape memory nitinol wire works based on its unique atomic structure. At a certain temperature (the transformation temperature), the wire can "remember" its original shape. When deformed below this temperature, it changes shape. But when heated to the transformation temperature or above, the atoms rearrange themselves and the wire returns to its original shape due to the phase transformation between martensitic and austenitic phases.

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What factors affect the cost of nitinol wire?

The cost of nitinos is affected by several factors. First, the cost of raw materials is a key factor. High quality nickel and titanium are essential and their price directly affects the total cost. Secondly, the complexity and precision requirements of the manufacturing process play a role.

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