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Product Details:
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Shape memory alloy, super elastic nickel titanium alloy, Nitinol wire for biomedicine
PRODUCT
Shape memory alloy, super elastic nickel titanium alloy, Nitinol round wire, flat wire, shaped cross sectional wire for biomedicine
OVERVIEW
Nitinol are the most comprehensively studied and best shape memory alloys. They have the characteristics of high strength, high plasticity, good corrosion resistance, good stability and excellent biocompatibility. The superiority of its application in medicine is that other shape memory alloys can not be replaced.
Nitinol combines two closely related unique characteristics: shape memory and superelasticity. Shape memory gives Nitinol the ability to be deformed at one temperature, and then return to its original shape when being heated to its transformation temperature. This effect is caused by the material changing from its low temperature monoclinic martensitic structure to the high temperature cubic austenitic structure.
PROPERTIES OF NITINOL
1 Shape memory
2 Super elastic
3 Sensitivity to changes in oral temperature
4 Good corrosion resistance
5 Toxin immunity
6 Gentle corrective force
7 Good shock absorption characteristics
NITINOL FOR BIOMEDICINE APPLICATION
Nitinol is a term for binary near equal-atom Ni-Ti alloys, and it is widely used in medical due to its unique super-elasticity. However, Ternary or other Nickel-Titanium alloys can be achieved for different properties.
For biomedicine, nitinol archwire is used for the early alignment of patients' teeth. Nitinol push spring and tension spring are springs used for orthodontic teeth, scoliosis orthopedic device. In addition, nitinol was used in surgery to make various bone connector, blood vessel clip, coagulation filters, blood vessel dilation components, all kinds of intracavitary stent, embolization device, heart patch, thrombus filters, interventional guide wires and surgical sutures, etc.
CHEMICAL COMPOSITION
Table 1
| Fe | Ni | Cr | Cu | Nb |
| ≤0.05 | 54.5-57.0 | ≤0.01 | ≤0.01 | ≤0.025 |
| C | Ti | Co | N+O | H |
| ≤0.05 | Balanced | ≤0.05 | ≤0.050 | ≤0.005 |
The chemical composition is as per ASTM F2063-12 or GB 24627-2009(wt%)
NITINOL WIRE
Shape memory Nitinol wire can be used to develop implants that may be delivered into the body in a compact shape and then activated into their functional form once they have been deployed. If you need the wire to be in a certain shape for a particular application, we offer Shape Setting. This “sets” a wire shape that specifically conforms to your device design requirements. Not only do we manufacture Nitinol in various forms, we control the entire process, from start to finish, by being the world's leading melt-to-finish source for Nitinol to the medical device industry.
Superelasticity occurs at temperatures just above the transformation temperature and allows the material to recover from up to 8% strain with a permanent set of 0.5% or less.
Nitinol is available from in two basic forms:
Nitinol round wire and flatwire
Nitinol centerless ground bar
All Nitinol grades are available in either cold worked condition ready for heat treatment or as straightened super-elastic wire.
NITINOL WIRE SPECIFIC APPLICATION
Nitinol wire is used for many different medical and industrial applications. Medical application include vascular therapy, cardiac rhythm management, neurostimulation, orthodontic, orthopaedic, endoscopy, implant dentistry, etc. Typical medical application include guide wire, woven support, dental root file, dental arch wire, iud, suture line, etc
Some typical engineering applications for each Nitinol medical grades are given below:
Nitinol A: Guidewires, stents, stylets, forming mandrels, stone retrieval baskets, orthodontic files, etc.
Nitinol B*: Often used in applications that require a high loading and unloading plateau stress at room temperature. Chromium doped for decreased transformation temperature and increased tensile strength.
Nitinol C**: Applications requiring increased stiffness. Cobalt doped for decreased transformation temperature and increased tensile strength.
Nitinol D: Provides the best cycling performances at body temperature (37°C).
Nitinol E: A common application for this alloy is high temperature actuators.
Nitinol F: A common application for this alloy is high temperature actuators.
Nitinol G: Typically used in applications that require a phase transformation at body temperature (37°C).
Nitinol H: For use in very cold temperature environment applications.
* Typical chemical composition: ASTM F2063 Exc. Cr 0.2% to 0.3%
** Typical chemical composition: ASTM F2063 Exc. Co 1% to 2%
MECHANICAL PROPERTIES OF SUPERELASTIC ALLOYS
Table 2: Cold worked super elastic
| Wire code | Ingot As(°C) | UTS (psi) | Elongation (%) | UTS (psi) | Elongation (%) | Loading Plateau (psi) | Unloading Plateau (psi) | Active Af(°C) |
| Niti A | -35 to -10 | 200,000 min | >4% | 180,000 min | > 10% | > 70,000 | > 20,000 | +10 to +18 |
| Niti B | -65 to 0 | 250,000 min | >4% | 210,000 min | > 10% | > 80,000 | > 35,000 | 0 + 18 |
| Niti C | -80* | 200,000 min | >5% | 190,000 min | > 10% | > 100,000 | > 60,000 | -15* |
| Niti D | -10 to +10 | 220,000 min | >4% | 180,000 min | > 10% | > 65,000 | > 7,000 | +14 to +22 |
| Niti H | ≤ -35 | 220,000 min | >4% | 160,000 min | > 10% | > 75,000 | > 25,000 | ≤0 |
| Notes |
1. Permanent Set < 0.5% after strained to 8% 2. Results are typical for round wire diameters from 0.05mm to 4.0mm. 3. All mechanical testing conducted at 22 ± 2°C 4. The active Af is the temperature at which the material has completely transformed to austenite. 5. * Typical target |
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MECHANICAL PROPERTIES OF SHAPE MEMORY ALLOYS
Table 3: Cold worked shape memory
| Wire code | Ingot As (°C) | UTS (psi) | Elongation (%) | UTS (psi) | Elongation (%) | Loading Plateau (psi) | Active Af(°C) |
| Niti E | ≥ +85 | 220,000 min | >3% | 160,000 min | > 10% | N/A | ≥ +85 |
| Niti F | +35 to +85 | 220,000 min | >3% | 160,000 min | > 10% | N/A | +40 to +80 |
| Niti G | +10 to +35 | 220,000 min | >3% | 160,000 min | > 10% | N/A | +22 to +40 |
| Note |
1. Results are typical for round wire diameters from 0.05mm to 4.0mm. 2. All mechanical testing conducted at 22°C ± 2°C 3. The active Af is the temperature at which the material has completely transformed to austenite. |
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NITINOL WIRE FORMS
Round wire: 0.05 to 4.0mm
Flat wire – aspect ratio: W/T < 10
Rolled Strip – aspect ratio: W/T >10:1
Minimum Thickness: 0.008mm
Maximum Width: 11.5mm
Turkshead: Square, Rectangular
Custom Shapes: A wide variety of shaped cross-sectional wire
Nitinoal round wire diameter and tolerance
Table 4
| Diameter mm | 4.00-2.00 | 2.00-1.00 | 1.00-0.35 | 0.35-0.26 | 0.26-0.15 | 0.15-0.05 |
| Tolerance mm | ±0.020 | ±0.015 | ±0.010 | ±0.007 | ±0.005 | ±0.004 |
Out of roundness within half of the diameter tolerance.
DELIVERY CONDITION
(1) Straightened superelastic(SE)
(2) Cold worked (CW)
WIRE SURFACE CONDITION
(1) Light Oxide - diamond drawn surface
(2) Dark Oxide - diamond drawn surface
(3) Black Oxide - diamond drawn surface
(4) Etch – chemical removal of oxide layer - will retain smooth surface
(5) Pickled – chemical removal of oxide layer along with a slight amount of base metal - surface will have a rough texture
(6) Etched and Mechanically Polished – Chemical removal of oxide layer followed by mechanical polish - surface will have stainless steel appearance (although at >40x magnification, micro scratches will be present
(7) Oxide free – smooth and without visible oxide
WIRE CODE
Active af temperature is one of the critical properties of Nitinol that can determine the effective super-elastic performance of the alloy. Although all the major Ni content in the range of 54.5~57.0mass% conforms the ASTM F2063-12 standard spec, its Af is very sensitive to the chemical composition, detailed grading of Nitinol composition is of crucial importance. This is why we use detailed and verified material code to identify the alloy.
Table 5
| Wire code | A | B | C | D | E | F | G | H |
| Active Af temperature ℃ | 70+/-10 | 30+/-10 | 25+/-5 | 17+/-7 | 10+/-10 | 5+/-10 | -20+/-10 | -30+/-15 |
NITINOL CENTERLESS GROUND BAR
Along with Nitinol wire, medical grade Nitinol bar also available with diameters range from 2.0mm to 5.0mm with the option of a natural forming oxide or centerless ground and polished surface.
TYPICAL MECHANICAL PROPERTIES OF GROUND BAR
Condition: Super elastic
Table 6
| Material Type | UTS (PSI) | Elongation (%) | Loading Plateau (PSI) | Unloading Plateau (PSI) | Active Af(°C) |
| Niti A | 130,000 | over 12 % | 65,000 | 15,000 | under 18 |
| Notes |
1. Permanent Set is 1% max. after strained to 6 % 2. All Mechanical Testing Conducted at Room Temperature (22°C ± 2°C) |
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MAIN APPLICATIONS
Orthopaedic
Orthodontic
STANDARD SPECIFICATION
ASTM F2063-12 Standard chemical composition of a wrought nitinol shape memory alloy used in medical devices and surgical implants
GB 24627 Standard chemical composition of a wrought nitinol shape memory alloy used in medical devices and surgical implants
ASTM F2633-13 Standard specification for seamless nitinol shape memory alloy fitting for medical devices and surgical implants
ASTM F2005-05 Standard terminology for nitinol shape memory alloys
ASTM F2004-05 A standard test method for the transition temperature of Nitinol alloy by thermal analysis
ASTM F2516-14 Tensile test method for nitinol hyperelastic materials
ASTM F2082-15 The standard test method for phase transition temperature of nitinolshape memory alloy by bending and free restoration.
ADVANTAGE
All incoming Nitinol raw materials are subjected to third party inspection to ensure they meet proprietary specifications for chemistry, transformation temperature, material homogeneity, and microstructure. To promote an exceptionally smooth and uniform surface finish quality, all wire and tube products utilize a high precision single and or multi-crystalline diamond drawing die technology. After the correct super-elastic heat treatment, medical grade nickel-titanium materials can undergo up to 8% strain without permanent bending at human temperature.
BUSINESS TERM
| Minimum Order Quantity | Negotiable |
| Price | Negotiable |
| Packaging Details | Water prevent, seaworthy transport, non-fumigation wooden box |
| Mark | As per order |
| Delivery Time | 60-90 days |
| Payment Terms | T/T, L/C at sight, D/P |
| Supply Ability | 20 metric tons per month |
NOTE:
More information available from our official web site http://www.cmmetal.cn
Contact Person: Mr. lian
Tel: 86-13913685671
Fax: 86-510-86181887
