Titanium nitride Characteristics and Application

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What is Titanium nitride (TiN)? Titanium Nitride (TiN) is a very hard ceramic, sometimes called Tinite, that’s used as a surface coating for titanium alloys, steels, carbides, and aluminum to improve their surface properties.
The thin coating of TiN, due to its golden color, is used as a protective and hardening layer for cutting and sliding surfaces. In addition, it can also be used as an exterior surface for medical implants that are non-toxic. In the majority of applications, a thin coating less than 5 millimeters is applied.

Characteristics of titanium Nitride
Titanium Nitride possesses a Vickers Hardness of 1800-2100. It also has a Modulus of Elasticity of 251 GPa. A thermal expansion coefficient is 9.35×10-6 K-1 and a transition temperature to superconductivity of 5.6 K.
Titanium Nitride is oxidized at 800 degC when in a normal environment. Titanium Nitride appears golden when applied to a surface. It has a brownish color. Laboratory tests show that it is chemically inert at 20 degC. However, with increasing temperatures, concentrated acid solutions can slowly attack the material. Titanium Nitride has a coefficient friction of 0.4-0.9, depending on its surface finish and substrate. The typical TiN structure is NaCl type with a 1:1 stoichiometry. However, TiNx with x between 0.6 and 1.2 is thermodynamically stabile.
TiN superconducts at cryogenic temperature, with critical temperatures as high as 6.0 K in single crystals. 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. After a thin layer of TiN had been chilled to almost absolute zero, it was transformed into the world’s first superinsulator. Its resistance increased by a factor 100,000.

Titanium Nitride Applications
TiN coated drill bit
Gerber pocketknife coated with dark gray TiCN
It is well known that TiN The coating improves the lifetime of machine tooling such as milling and drill bits by up to three times.
TiN is widely used for decorating automotive trim and costume jewelry because of the metallic gold colour. TiN can also be used on door and plumbing hardware as a decorative top-layer, often with nickel or chromium plated surfaces. It’s used in military and aerospace applications to protect sliding surfaces such as suspension forks on bicycles and motorbikes and shock shafts in radio-controlled cars. As it is so durable, TiN can also be used as a coating for the moving parts on many rifles and semiautomatic weapons. The coating is not only extremely durable but also very smooth. This makes removing carbon build-up a breeze. TiN, which is non-toxic and meets FDA guidelines has been used to coat medical devices, such as orthopedic bone saw blades and scalpel knives, when edge retention and sharpness were important. The TiN coatings were also used to coat implanted medical implants (especially hip implants) and prostheses.
Although thin films are not as visible, they still have a similar effect. TiN In microelectronics they are used as diffusion barriers to stop the diffusion of metal into silicon. TiN is classified in this context as a “barrier metal” (electrical conductivity 25 uO*cm), despite the fact that it is a clear ceramic when viewed from a chemistry and mechanical perspective. Recently, chip design for 45 nm and beyond has also used TiN to improve transistor performance. Combining gate insulators (e.g. HfSiO has a greater permittivity than SiO2 and can therefore be used to reduce gate lengths with better threshold voltage, lower leakage, and higher drive current. TiN thin films may also be used to coat zirconium-alloys for accident resistant nuclear fuels.
TiN layers can be used for electrodes as well in bioelectronics applications, such as in intelligent implants and in-vivo sensors that must 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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