تطبيق سبائك التيتانيوم والنيكل أسلاك الذاكرة
(1) Biomedical applications: TiNi shape memory alloys used in the medical field, in addition to utilizing their shape memory effect or superelasticity, should also meet the needs of chemistry and biology, that is, good biocompatibility. TiNi can form a stable passivation film with living organisms. At present, the main applications of TiNi alloy wire in medicine are:
(a) Teeth correction wire is made of super elastic TiNi alloy wire and stainless steel wire. Among them, super elastic TiNi alloy wire is the most suitable. Stainless steel wire and CoCr alloy wire are usually used for orthodontics, but these raw materials have the disadvantages of high elastic modulus and small elastic strain. In order to provide appropriate correction force, it must be processed into an arch shape before correction, and ligation and fixation need to be skilled. If TiNi alloy is used as dental orthopedic wire, plastic deformation will not occur even if the strain is as high as 10%, and the stress-induced martensitic transformation (stress-induced martensite) causes the elastic modulus to exhibit non-linear characteristics, that is, when the strain increases Corrective power fluctuates very little. This raw material is not only easy to operate and effective, but can also reduce patient discomfort.
(b) Scoliosis correction Various scoliosis diseases (congenital, habitual, neurological, rickets, idiopathic, etc.) not only cause serious damage to the body and mind, but also compress the internal organs, so it is necessary Perform surgical correction. Currently, this kind of surgery uses stainless steel Hallington rods for orthopedics. When placing the orthopedic rods during the operation, the correction force on the spine after fixation needs to be kept below 30-40kg. Once the force is too large, the orthopedic rods will be damaged, resulting in Not only the spine, but also the nerves are at risk of damage. At the same time, the correction force will change over time after the orthopedic rod is installed. When the correction force drops to 30% of the initial value, surgery will be required to adjust the correction force, which causes great mental and physical pain to the patient. The Hallenton rod made of shape memory alloy only requires one placement and fixation of the orthopedic rod. If the correction force of the orthopedic rod changes, sufficient correction force can be restored by heating the shape memory alloy in vitro and raising the temperature to about 5°C higher than body temperature. In addition, TiNi shape memory alloys are used in surgery to make various bone connectors, vascular clamps, coagulation filters, and vascular expansion components. At the same time, it is also widely used in stomatology, orthopedics, cardiovascular department, thoracic surgery, hepatobiliary department, urology, gynecology, etc. With the development of shape memory, medical application will become more widespread.
(2) Application in aerospace industry: Shape titanium-nickel alloy memory alloy has been used in aviation and space equipment. For example, cryogenic joints are used in the hydraulic system of military aircraft. Europe and the United States are developing shape memory alloy materials for smart horizontal rotors of helicopters. Since the use of high-vibration and high-noise helicopters is restricted, the main sources of noise and vibration are blade vortex interference and slight errors in blade profile. This requires a device that balances the pitch of the blades so that each blade can accurately rotate in the same plane. A blade orbit controller has been developed, which uses a small double-tube shape memory alloy driver to control the position of small fins on the edge orbit of the blade to minimize vibration. It can also be used to make lunar antennas to explore the mysteries of the world. We use shape memory alloys to make antennas in high temperature environments, and then compress it into a small iron ball at low temperatures, reducing its volume to one thousandth of its original size. , so that it can be easily transported to the moon. The strong radiation of the sun will restore it to its original shape and send valuable world information back to the earth as needed. Additionally, a shape-memory release device was used in the satellite using an openable container that was used to protect the sensitive germanium detector from contamination during installation and launch.
(3)Daily life application:
(a) Anti-scalding valves In domestic life, shape memory valves have been developed to prevent accidental scalding from hot water in sinks, bathtubs and bathrooms; these valves are also used in hotels and other suitable places. If the temperature of the water flowing out of the faucet reaches a temperature that can burn people (about 48°C), the shape memory alloy drives the valve to close until the water temperature drops to a safe temperature, and the valve does not reopen again.
(b) Glasses structure: Installing TiNi alloys on the bridge of the nose and ears of the glasses structure can make people feel comfortable and resist wear. Because the flexibility of TiNi alloys has made them widely used in the fashion industry to modify glasses. Super-elastic TiNi titanium alloy wire is used as the structure of the glasses. Even if the lens thermally expands, the shape-memory alloy wire can clamp the lens firmly with super-elastic constant force. The structure of glasses made of these super-elastic alloys can deform greatly, which is not possible with ordinary glasses frames.
(c) Mobile phone antennas and fire inspection valves Using superelastic TiNi wire to make cellular phone antennas is another application of shape memory alloys. In the past, stainless steel antennas were used, which often suffered damage due to bends. Mobile phone antennas using TiNi shape memory alloy wire are widely expected to have high damage resistance. Therefore it is often used to make cellular phone antennas and fire viewing valves. In a fire, when some places heat up, the valve will automatically close to prevent dangerous gases from entering. The advantage of this special structural design is that it has the ability to check the operation of the valve and then reset it to a safe state; this type of fire check valve is used in the semiconductor manufacturing industry, where toxic gases are used in the dispersion process of semiconductor manufacturing; This type of fire detection valve is also used in chemical and petroleum plants.
(4) Application in mechanical and electronic products: In 1970, the United States used shape memory alloy to make low-temperature cooperation connectors for F-14 combat, and subsequently millions of connectors were used. Shape memory alloys are used as low-temperature cooperative connections in aircraft hydraulic systems and in smaller petroleum, petrochemical, and electrical industry products. Another type of connector is in the form of welded mesh wire, used to create a safety joint for the wire braided layer of the conductor. This kind of connector is now used in sealing equipment, electrical connection equipment, electronic engineering machinery and equipment, and can operate reliably at 65~300℃. Sealing system devices have been developed for use as electrical connections in harsh environments. The shape memory alloy is made into a spring that can open and close the shutter, which is used to protect the fog lamp from being damaged by flying debris. It is used to make precision instruments or precision lathes. Once deformed due to vibration, bump, etc., the fault can be eliminated by heating. In the mechanical manufacturing process, various stamping and mechanical operations often require the transfer of parts from one machine to another. Now a shape memory alloy has been used to develop a replacement for manual or hydraulic clamps. This device is called a driving cylinder. It has the characteristics of high efficiency, sensitivity and large clamping force.
Nitinol wire is a metal alloy sometimes called shape memory alloy (SMA) wire.
Nitinol is an example of a "smart" material that changes between two solid phases, called austenite and martensite, which involves the rearrangement of atoms within its crystal lattice. Nitinol is unusual in that it "remembers" its shape because its crystal structure arrangement does not change during phase transitions.
temper:
Our Nitinol wire products produce products with engineering mechanical properties designed specifically for your end use and manufacturing process.
Provides superelasticity and shape memory Transition temperature:
Custom alloy recipes possible.
Basic knowledge of nickel titanium alloy:
Nitinol is a nickel-titanium alloy that differs from other materials in its shape memory and superelastic properties.
Nitinol wire is the most established form of this unique superelastic and shape memory alloy, and it is available in many different sizes, alloys and finishes. Moreover, the shape provides both memory and superelastic form. Niti Shape Memory Alloy is a NiTi alloy catheter increasingly used in the medical device industry for stents, guidewires and other critical applications.
Nitinol
Physical properties Density: 6.45gms/cc
Melting temperature: 1240-1310° C Resistivity (high temperature state): 82 uohm-cm Resistivity (low temperature state): 76 uohm-cm Thermal conductivity: 0.1 W/cm -° C Thermal capacity: 0.077 cal/gm-° C Latent heat: 5.78 cal/gm; 24.2 Joules/g Magnetic susceptibility (high temperature): 3.8 uemu/gm Magnetic susceptibility (low temperature): 2.5 uemu/gm
Nitinol
Mechanical Properties Ultimate Tensile Strength: 754 - 960 MPa or 110 - 140 ksi Typical Elongation at Break: 15.5%
Typical yield strength (high temperature): 560 MPa, 80 ksi Typical yield strength (low temperature): 100 MPa, 15 ksi
Approximate elastic modulus (hi-tem): 75 GPa, 11 Mpsi
Approximate modulus of elasticity (lo-temp): 28 GPa, 4 mpsi
Approximate Poisson's ratio: 0.3
drive
Energy conversion efficiency: 5%
Work output: ~1 Joule/gram
Certification:
conversion temperature
Tension properties
chemical composition
Customer specific requirements
Shape memory alloy description:
The term shape memory alloy (SMA) is applied to a group of metallic materials that have demonstrated the ability to return to some previously defined shape or size after appropriate heat treatment. Generally speaking, these materials can plastically deform at relatively low temperatures and when exposed to higher temperatures, they will return to their original shape after deformation.
application:
Nickel titanium alloys are currently used in antennas, flexible glasses, orthodontic braces, aerospace release mechanisms, medical devices such as stents and endoscopic guidewires, greenhouse window openers, hot water anti-scalding valves, magician’s tricks and more.
Zhuohangxin Metal's NiTi alloy wire supports the most complex component designs requiring complex geometries. By fine-tuning the chemical composition of the wire and the thermal processing process, Zhuohangxin Metal achieved the flexibility and kink resistance of the wire core for medical device applications, including stents, catheters, endodontic files, needles, trocars, mandrels, Baskets, surgical instruments, snares and guidewires.
Nitinol wire is also useful in industrial applications such as couplings, actuators, sealing high-pressure fuel channels, and commercial applications such as cell phone antennas and eyeglass frames. The customer specifies their desired operating temperature and how the material should behave, and how Zhuohangxin Metal should adjust the composition accordingly.
Precautions:
Nitinol, like other materials, has limitations. If the helix is stretched too much, it will be permanently damaged. If it is subjected to too much force during the thermal shape memory recovery process, it will lose its shape memory. Specifically, if a nickel-titanium alloy is subjected to a cycle in which it is cooled, elongated by stretching, and heated without being allowed to shrink (i.e., maintaining a constant length), then the ability to do work will change in just a few seconds. weaken within a cycle. On the other hand, if the sample (e.g., a nitinol wire in tension) is allowed to contract with a constant force during heating, the work ability of the wire can be enhanced through cycles, and the wire will quickly stabilize so that subsequent cycles can be repeated .
At Zhuohangxin Metal, all incoming nickel titanium alloy raw materials are inspected to ensure they meet proprietary internal specifications for chemistry, ingot transformation temperature, material uniformity and microstructure. All wire products utilize proprietary single and polycrystalline diamond wire drawing die technology designed to deliver exceptionally smooth and uniform surface finish quality. With the correct superelastic heat treatment, medical-grade nickel titanium will withstand strains of up to 8% without permanently kinking at body temperature.
We offer nitinol wire in the "drawn" condition for experimenters who wish to form and train their own shapes. They must be "cooked" (shaped and annealed) to exhibit their shape memory properties, and many parameters of time, temperature and processing can give a wide range of results.
