Superelastic Nitinol's phase transformation in environments as cool as body or room temperature, makes these cooler grades more common in medical devices or other lower temperature applications.
Examples of uses for superelastic Nitinol:
NiTi #1 is commonly used for applications requiring superelasticity at room and body temperature. Typical applications include guidewires, stents, stylets, forming mandrels, stone retrieval baskets, and orthodontic files.
NiTi #2 is a ternary grade of Nitinol containing additions of chromium (0.2-0.3% Cr by weight) and is often used in applications requiring increased loading and unloading plateau stresses and decreased transformation temperatures.
NiTi #3 is a ternary grade of Nitinol containing additions of cobalt (1.0-2.0% Co by weight) and is often used to maximize loading and unloading plateau stresses over other Nitinol grades. Decreased transformation temperatures also allow this grade of Nitinol to remain superelastic in colder temperature applications.
NiTi #4 has the warmest transformation temperatures of our superelastic grades, resulting in decreased modulus and plateau stresses and improved fatigue performance at room and body temperatures when compared to other superelastic Nitinol grades with equivalent previous cold work and heat treatments.
NiTi #9 is the coldest grade of binary Nitinol that we offer and is used for applications requiring superelasticity at colder temperatures.
After an appropriate heat treatment, superelastic Nitinol will accommodate strain of up to 8% in tension without significant permanent deformation, when tested at room temperature which is above the transformation temperature of the material.
All Binary Nitinol grades meet the chemistry requirements set forth by ASTM F2063 for use in surgical implants.
Our unique product offerings could be just what you're looking for if the typical grades of Nitinol aren't quite right. From ultra-smooth oxide free Silk® Nitinol, to ultra-stiff USN® wire, you'll find all kinds of material solutions right here.
Nitinol offers seemingly endless possibilities. You can use the following information to learn more about superelastic Nitinol, and the markets we serve.
|Superelastic Thermal and Mechanical Properties Table|
|Elongation (%)||Upper Plateau
Permanent set < 0.5% after strained to 8%. Results are typical for round wire diameters from 0.03 mm to 1.02 mm [0.001 in to 0.04 in]. All mechanical testing conducted at 22°C ± 2°C [71.6°F ± 3.6°F]. Our video library can help you learn about active Af testing using the Fort Wayne Metals Manual Method and test methods conforming to ASTM F2082, such as LVDT or the vision system. You can compare the two test methods by reading the whitepaper. Please note that a correlation study may be required to switch test methods on an existing part.
|NiTi #1||-35 to -10||1379 ||> 4%||1241 ||> 10%||> 483
|10 to 18|
|NiTi #2||-65 to 5||1655 ||> 4%||1378 ||> 10%||> 552
|0 to 18|
|NiTi #3||-95 to -65||1379 ||> 4%||1241 ||> 10%||> 689
|-20 to -10|
|NiTi #4||-10 to 10||1379 ||> 4%||1241 ||> 10%||> 448
|14 to 22|
|NiTi #9||≤ -35||1379 ||> 4%||1103 ||> 10%||> 517
|-10 to +5|
Nitinol finds uses in many places, not limited to the medical field. While we have a wealth of knowledge on Nitinol as it pertains to medical devices, we also know our way around industrial applications such as actuators.
Our Nitinol experts are happy to help you find the right material for your application. Contact us to find out what Nitinol can do for you.
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