Titanium nitride Characteristics and Application
What is Titanium Nitride?
TiN (also known as Tinite), is a very hard ceramic material. It's often used as a coating for titanium alloys and steel components.
The thin TiN coating can be applied to protect and harden cutting and sliding surfaces. Due to its gold appearance, it is also used as an exterior non-toxic for medical implants. Most applications require a coating that is less than 5 micrometers (10.00020 in).
Specifications of Titanium Nitride
Titanium Nitride's Vickers hardness is 1800-2100. The material also has a modulus for elasticity of 251 GPa. There are also 9.35x10-6 K-1 thermal expansion coefficient and a superconducting transformation temperature of 5.6 K.
Titanium Nitride will react at 800°C under normal atmospheric conditions. Titanium Nitride will turn a golden brown colour when used as a coating. Laboratory tests have shown that it can be chemically stabilized at 20°C. But, the substance is susceptible to being slowly destroyed by acidic solutions of rising temperatures. Titanium Nitride has a coefficient that is between 0.4 and 0.9 depending on how the surface finishes are. This means it will rub against another Titanium Nitride-surface (nonlubricated). TiN is a typical TiN structure that has NaCl-type crystal structure. TiNx compound with x values ranging from 0.06 to 1.2 are however thermodynamically solid.
TiN is superconducting in cryogenic temperatures. Single crystals must reach 6.0 K. Superconductivity in thin-film TiN has been studied extensively, with the superconducting properties strongly varying depending on sample preparation, up to complete suppression of superconductivity at a superconductor-insulator transition. One thin TiN layer was frozen to absolute zero. This transformed it into the world's first ever superinsulator. The resistance increased by 100,000.
Application of titanium nitride
TiN-coated Drill Bit
On a Gerber pocketknife, a dark grey TiCN coating is applied
It is well-known for its use in
The coating helps to preserve the edge and resist corrosion.
TiN's metallic golden color makes it ideal for decorating costume jewelry or automotive trim. The TiN top-layer is often applied to door hardware and plumbing fixtures with nickel (Ni), chromium, or chromium plat substrates. TiN is used for coatings in the aerospace and military industries, as well as protecting the surfaces of the suspension forks on bicycles and motorbikes. It also protects the shock shafts from radio-controlled cars. It is used for protection on moving parts in many firearms and semi-automatic guns. TiN is very durable. It also has a smooth surface that makes it extremely simple to get rid of carbon buildup. TiN is safe and meets FDA standards. It has been used in surgical instruments such as blades for scalpel and saws for orthopedic bones. Also, TiN coatings are used for implanted prostheses such as hip replacement implants and other medical implants.
Although thinner films may not be as visible, they are still very noticeable.
These are also useful in microelectronics. They serve as an electrical connection between active devices and metal contacts. Additionally, they act as a diffusion barrier, blocking the diffusion of metal into silicon. TiN has been classified as an "electrical resistive metal" (electronic resistance 25 uO*cm) in this context. It is not a ceramic, but it does have a clear chemistry and mechanical behaviour. Modern chip designs using TiN in 45nm technology or beyond make use of it as a metal to improve transistor performance. When combined with gate dielectrics such as. Combining gate dielectrics, such as HfSiO, which have a higher permittivity than standard SiO2, can reduce the length of the gate. TiN thin film is being studied for the coating of zirconium-alloys.
Due to their excellent biostability TiN layers can be used as electrodes for bioelectronic applications, such as intelligent implants or in-vivo sensor that need to resist the corrosion caused by bodily fluids. TiN electrodes have already been applied in the subretinal prosthesis project as well as in biomedical microelectromechanical systems (BioMEMS).
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