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Titanium nitride is a refractory compound with high microhardness and chemical and thermal stability

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Update time : 2021-02-19 10:33:29
What is titanium nitride?
Titanium nitride is a refractory compound with high microhardness and chemical and thermal stability. TiN has many uses: as a component of special refractory materials and cermets, as a crucible material for metal anoxic casting, and as a precursor for wear-resistant and decorative "gold-like" coatings. Research on the combustion of compacted titanium powder samples in nitrogen shows that the filtration rate of nitrogen in titanium is the main factor affecting the combustion process. Titanium sponge is a purer, cheaper and more convenient source of titanium than titanium powder.
How is titanium nitride used?
Titanium nitride is a bright gold ceramic coating applied to the metal surface by the physical vapor deposition (PVD) process. The coating has high hardness and low friction and has moderate oxidation resistance. The coating produced by this method is very smooth and does not require post-painting.
The well-known use of TiN coatings is to maintain edges and corrosion resistance on machine tools (such as drills and milling cutters), usually increasing its service life by more than three times.
As the metal of TiN is golden, it can be used to decorate costume jewelry and car accessories for decoration. TiN is also widely used as a top coating on consumer sanitary equipment and door hardware, usually using a substrate plated with nickel (Ni) or chromium (Cr). As a coating, it can be used for aerospace and military purposes, and to protect the sliding surfaces of the front forks of bicycles and motorcycles and the shock-absorbing shafts of radio-controlled vehicles. TiN is also very durable, so it is also used as a protective coating on the moving parts of many rifles and semi-automatic firearms. In addition to being durable, it is also very smooth and can remove carbon deposits very easily. TiN is non-toxic, compliant with FDA guidelines, and has been used in medical equipment such as scalpels and orthopedic bone saw blades where sharpness and edge retention are important. TiN coatings have also been used in implanted prostheses (especially hip replacement implants) and other medical implants.
Although TiN film is not so visible, it is also used in microelectronics to act as a conductive connection between active devices and metal contacts used to operate circuits, and at the same time as a diffusion barrier to prevent metal from diffusing into the metal. silicon. In this case, even though TiN is clearly ceramic from a chemical or mechanical point of view, it is classified as a "barrier metal" (resistivity ~25 µΩ·cm). The latest chip designs of 45 nm and higher technologies also use TiN as a "metal" to improve transistor performance. Combined with a gate dielectric with a higher dielectric constant than standard SiO2 (such as HfSiO), the gate length can be reduced with low leakage, higher drive current, and the same or better threshold voltage. In addition, a TiN film is currently being considered to coat zirconium alloys that are resistant to accidental nuclear fuel.
Due to its high biological stability, TiN layers can also be used as electrodes in bioelectronic applications, such as in smart implants or in vivo biosensors, where they must withstand severe corrosion caused by body fluids. TiN electrodes have been used in subretinal prosthesis projects and biomedical microelectromechanical systems (BioMEMS).
Which is better, titanium or titanium nitride?
For softer materials such as wood, plastic and soft metals, titanium alloy drill bits are often a better choice. Although the type of titanium coating is different. For example, titanium carbonitride coatings can generally treat harder materials than titanium nitride coatings. Titanium is an element, a metal, titanium nitride (TiN) is a compound composed of titanium and nitrogen
Is titanium nitride toxic?
Titanium Nitride (TiN; sometimes called Tinite) is a very hard ceramic material, usually used as a coating for titanium alloys, steel, carbides and aluminum components to improve the surface properties of the substrate.
TiN is used as a thin coating to harden and protect cutting and sliding surfaces, for decorative purposes (due to its golden appearance), and as a non-toxic exterior for medical implants. In most applications, the applied coating thickness is less than 5 microns (0.00020 inches). Therefore, this study concluded that the test material is non-toxic, non-irritating, non-hemolytic and biocompatible.
How strong is titanium nitride?
feature. The Vickers hardness of TiN is 1800-2100, the elastic modulus is 251 GPa, the coefficient of thermal expansion is 9.35×10-6 K-1, and the superconducting transition temperature is 5.6K. The tiN will oxidize at a temperature of 800°C. Normal atmosphere.
Other advanced applications of titanium nitride

1. Plasma titanium nitride promotes indium oxide CO2 photocatalysis.
Nano-scale titanium nitride TiN is a metal material that can effectively collect sunlight in a wide spectral range and generate a higher local temperature through the photothermal effect. Nano-scale indium oxide-hydroxide In2O3-x(OH)y is a semiconductor material capable of photocatalytic gaseous CO2 hydrogenation. However, its wide electron band gap limits its absorption of photons to the ultraviolet region of the solar spectrum. In this article, the benefits of two nanomaterials in a ternary heterostructure are combined: TiN @ TiO2 @ In2O3-x(OH)y. This heterogeneous structure material synergistically couples metal TiN and semiconductor In2O3-x(OH)y through the interface semiconductor TiO2 layer so that the conversion rate of the photo-assisted reverse water gas shift reaction greatly exceeds its single component or any binary combination.
2. Dissolving vanadium into the titanium nitride lattice framework to achieve reasonable polysulfide adjustment in Li-S batteries 
Reasonable adjustment of host-guest interaction chemistry is of great significance, but it has not been effectively applied to lithium-sulfur (Li-S) batteries. Here, a unique titanium-vanadium-vanadium nitride (TVN) solid solution fabric was developed as an ideal platform for fine structure adjustment to achieve efficient and long-lasting sulfur electrochemistry. It shows that dissolving V in the TiN lattice framework can skillfully adjust the coordination and electronic structure of Ti and V, thereby adjusting their chemical affinity for sulfur species. Therefore, the optimized Ti-V interaction can provide the highest total polysulfide adsorption capacity, and help to firmly fix the sulfur and accelerate the reaction kinetics. The final Li-S battery achieves excellent cycling ability, after 400 cycles, its capacity retention rate is as high as 97.7%. In addition, under a high sulfur load of 6.0 mg cm-2 and a finite electrolyte concentration of 6.5 mL g-1, a reversible area capacity exceeding 6.11 mAh cm-2 can be maintained. This work provides a novel strategic perspective for the rational adjustment of high-quality lithium-lithium batteries and the fine structure in the future.
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