| Nitinol
Wire
Nitinol Strip
Nitinol Tubing, Processes
& Finishes
Nitinol Surface Finish
Definitions
NITINOL
WIRE
Memry's
nickel-titanium wires are fabricated from a variety of nitinol
alloys. These wires have tailored mechanical and thermal
properties as a function of their chemical composition and thermo-mechanical
processing: All wires are supplied on a spool or cut to length
to customer specification. Wires in the as-drawn condition are
not straight and typically have a slight amount of cast and
helical twist. Straight superelastic wires are superelastic
at ambient and body temperatures. Please refer to the respective
Memry Specification for mechanical and thermal performances
of the products.
| CW-xx- |
Generic
As-Drawn BB Wire |
| Alloys |
BB |
| Condition |
As
Drawn. 25% to 45% Cold Work in 5% Increment |
|
Standard Finish (1) |
Light
Oxide |
|
Standard Sizes (2) |
From
0.004” to 0.050” Diameter
From 0.015” x0.015” to 0.040”x0.040” |
| Format(s) |
Round,
Square or Rectangular wire |
| Memry
Specification(s) |
MPS-137 |
(1) Optional
Finish: Black Oxide, Sandblasted, Polished.
(2) Other sizes upon request.
Example: CW40-BB-35, As Drawn Wire, Alloy BB, 40% Cold Work,
0.035” diameter.
| ARCH-BB- |
As-Drawn
Wire for Dental Applications |
| Alloys |
BB |
| Condition |
As
Drawn. Fixed, 35% Cold Work typical |
| Standard
Finish (1) |
Light
Oxide |
Standard
Sizes (2) |
Up
to 0.020” Diameter
Up to 0.025”x0.025” Square or Rectangular |
Format(s) |
Round,
Square or Rectangular Wire |
Memry
Specification(s) |
MPS-108 |
(1) Optional
Finish: Black Oxide, Matte, Polished.
(2) Other sizes upon request.
Example: ARCH-BB-19x25, As Drawn Wire, Alloy BB, Rectangular,
0.021”x0.025”
| GUIDE- |
Super
Straight Superelastic Wire |
| Alloy(s) |
BB,
BC |
| Condition |
Cold
worked and guidewire straight-annealed |
| Standard
Finish (1) |
Light
Oxide |
| Standard
Sizes (2) |
0.004"
to 0.102" Diameter |
| Format |
Round
wire |
| Memry
Specification(s) |
MPS-118
(BB), MPS-124 (BC) |
(1) Optional
Finish: Black Oxide, Matte, Polished.
(2) Other sizes upon request.
Example: GUIDE-BB-20, Guidewire Straight Superelastic, Alloy
BB, 0.020” diameter.
| SE-BB-- |
Generic
Straight Superelastic Wire |
| Alloy(s) |
BB |
| Condition |
Cold
worked and straight strand-annealed |
| Standard
Finish (1) |
Light
Oxide |
| Standard
Sizes (2) |
0.004"
to 0.080" Diameter |
| Format |
Round
wire |
| Memry
Specification(s) |
MPS-147 |
(1) Optional
Finish: Black Oxide, Matte.
(2) Other sizes upon request.
Example: SE-BB-25.0, Generic Straight Superelastic, Alloy
BB, 0.025” diameter.
| SE-SF- |
Straight
Hi-Flex Superelastic Antenna Wire |
| Alloy(s) |
SF |
| Condition |
Cold
worked and straight strand-annealed |
| Standard
Finish (1) |
Light
Oxide |
| Standard
Sizes (2) |
0.035"
Diameter |
| Format(s) |
Round
wire |
| Memry
Specification(s) |
|
(1) Optional
Finish: Black Oxide, Matte.
(2) Other sizes upon request.
Example: SE-SF-35.0, Straight Hi-Flex Superelastic, Alloy
BB, 0.025” diameter.
| SE-BA- |
High
Stiffness Superelastic Wire |
| Alloy(s) |
BA |
| Condition |
Cold
worked and straight strand-annealed |
| Standard
Finish (1) |
Light
Oxide |
| Standard
Sizes (2) |
0.012"
to 0.055" Diameter |
| Format(s) |
Round
wire |
| Memry
Specification(s) |
MPS-139 |
(1) Optional
Finish: Black Oxide, Matte.
(2) Other sizes upon request.
Example: SE-BA-35.0, Straight Superelastic, Alloy BA, 0.035”
diameter.
| BTR- |
Body
Temperature Response Wire |
| Alloy(s) |
BB,
BD |
| Condition |
As-Drawn,
35% Cold Work typical |
| Standard
Finish (1) |
Light
Oxide |
| Standard
Sizes (2) |
0.004"
to 0.080" Diameter |
| Format
(3) |
Round
wire |
| Memry
Specification(s) |
MPS-140
(BB) |
(1) Optional
Finish: Black Oxide, Matte.
(2) Other sizes upon request.
(3) Square or rectangular upon request.
Example: BTR-BB-0.059, Body Temperature Response, Alloy
BB, 0.059” diameter.
| ALLOY-B |
Martensitic
Wire |
| Alloy(s) |
B |
| Condition |
Cold-worked
and straight annealed |
| Standard
Finish (1) |
Light
Oxide |
| Standard
Sizes (2) |
0.004"
to 0.102" Diameter |
| Format(s)
(3) |
Round
wire |
| Memry
Specification(s) |
MPS-135 |
(1) Optional
Finish: Black Oxide, Matte
(2) Other sizes upon request.
(3) Square or rectangular upon request.
Example: ALLOY-B-0.102-WIRE, annealed martensitic wire,
Alloy B, 0.102” diameter.
| NiTiNb
Wire |
Specialty
Wire, Wide Hysteresis |
| Alloy(s) |
X |
| Condition |
Call
Customer Service |
| Standard
Finish |
| Standard
Sizes |
| Format(s) |
| Memry
Specification(s) |
NITINOL
STRIP
Memry's nitinol strip products are available in the as-rolled
cold worked or heat treated straightened conditions.
| STRIP- |
Nitinol
Strip |
| Alloy(s) |
BB |
| Condition |
As
Rolled or Superelastic Straight |
| Standard
Finish (1) |
Light
Oxide |
| Standard
Sizes |
0.002"
min. thickness
Width/Thickness ratio 5 to 20
Contact Customer Service |
| Format(s) |
Rectangular |
| Memry
Specifications |
EPS-101,
EPS-103 |
(1) Other
Finishes upon request
NITINOL
TUBING
Memry's standard nickel-titanium tubing is fabricated from our
superelastic binary nickel-titanium BB alloy (link to Alloys).
Tubing typically comes in straight, discrete lengths. Additionally,
enhanced inside diameter surface finishes are available.
Contrarily to the industry practice, our tubing is processed
by either of 2 types of proprietary processes:
- Continuous
to allow outstanding and consistent mechanical and thermal
properties and the smallest sizes and longest lengths in
the industry, down to 0.003” Inside diameter.
- Hybrid
(a combination of 2 processes) to allow the highest level
of concentricity, thin walls and very tight dimensional
control for the most stringent applications such as stent
tubing.
| TUBE |
Superelastic
Nitinol Tubing |
| Alloy(s)
(1) |
BB |
| Condition |
Cold
worked and straight strand-annealed |
| Outside
Diameter |
0.005”
to 0.500” Diameter |
| OD/ID
ratio |
1.08
to 2.5 |
| Length
(2) |
Up
to 14 feet, burr-free ends |
| Standard
OD Finish (3) |
Light
Oxide |
| ID
Finish (4) |
see
Tube ID Finishes below |
| Memry
Specification(s) |
MPS-127 |
(1) Alloy
B, thermal shape memory, upon request
(2) Can be cut to length to customer’s specification
(3) Optional Finish: Black Oxide, Ground
(4) See Improved Finishes below.
Example: TUBE-BB-12x20x60, Superelastic tubing, Alloy BB,
0.012” ID x 0.020” OD x 60” Length
| MEMRY
Proprietary Tube Drawing Processes |
Continuous
Process - Patented
-
Processed continuously as a composite using “soft”
shape memory core
-
OD/ID ratio maintained through process
-
Core is removed when the material is at final size.
|
 |
Hybrid
Process - Patent Pending
- Manufactured
in discrete lengths over rigid substrate after continuous
upstream processing of tube blanks prior to the cold
working stage.
|
 |
Nitinol
Tube ID Finishes
Memry nitinol tubing is supplied with a slurry cleaned Inside
Diameter (ID) surface. A Super Finish is available upon request
to satisfy the requirements of the most stringent applications
and will drastically improve the finish of our customers end-product
during post-processing operations such as mechanical or electro-polishing.
The Super Finish comes standard on all Hybrid Process tubing.
| Tubing
ID
As-Drawn
I.D. Condition
|
*
View on right side is magnified view of blue framed window
in left view |
| Tubing
ID
Standard
As-Supplied I.D. Condition
|
* View on right side is magnified
view of blue framed window in left view |
| Tubing
ID
Optional
Super Finish I.D. condition
|
*
View on right side is magnified view of blue framed window
in left view |
| Tubing
ID
Optional
Super Finish I.D. Condition
(High Magnification)
|
* View
on right side is magnified view of blue framed window
in left view |
NITINOL
FINISH DEFINITIONS
| Oxide
coating |
A
relatively thick Nitinol oxide layer created by annealing
the material in an oxidizing environment (rather than
an inert environment) during processing. This finish is
useful for laser cutting and for minimizing reflection.
A light oxide coating has typically a slight yellow straw
color. |
| Electro-polishing |
An
electro-chemical process for polishing materials resulting
in a smoother finish than the part had originally. The
process preferentially removes high spots to achieve a
smooth finish. Memry passivates all electro-polished parts
as standard practice. |
| Chemical
Polishing |
A
chemical only method for polishing materials. It is somewhat
selective, resulting in a bright finish. Memry passivates
all chemically polished parts as standard practice. |
| Passivation |
Similar
to anodizing Aluminum. Passivation of Nitinol creates
a Titanium-rich oxide layer improving the corrosion resistance
of the surface. |
| Slurry
Blasting |
A
method for removing the as-drawn texture from the ID of
tubing by circulating abrasive media through the tube,
resulting in a clean smooth finish. This can also decrease
the wall thickness measurably. |
| Microblasting |
Scaled
down version of sandblasting using very fine abrasive
media and smaller flow rates. Used to remove oxide. Results
in a matte, finely textured, bare metal surface. Leaves
a good surface for bonding assemblies or subsequent finishing
operations. |
| Chemical
Etching |
A
chemical means to remove oxide from the metal surface,
non-selectively, resulting in a passive surface that has
a bright, semi-gloss finish. The final texture is the
same as the material had before etching. The etching removes
a uniform layer of material. |
| Centerless
Grinding |
An
abrasive machining technique using multiple grinding wheels
to maintain roundness and concentricity during metal removal.
This process results in a shiny, bare metal surface with
extremely fine circumferential grinding marks. Typically
used to decrease or profile the outside diameter of wire
and tubing or to improve their external surface. |
| Electrolytic
cutting |
A
cutting method that combines abrasive media and electrochemical
erosion to result in a burr-free cut. The process can
be adjusted to leave very rounded edges. |
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