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Titanium Nitride Properties And Application of Titanium Nitride Ceramic Materials Iin The Market

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Update time : 2020-06-08 10:38:02

Titanium Nitride Properties:

Titanium nitride powder has a typical NaCl type structure, which is a face-centered cubic lattice with a lattice constant of a = 0.4241 nm, in which titanium atoms are located at the top of the corners of the face-centered cubic. TiN is a non-stoichiometric compound, and its stable composition range is TiN0.37-TiN1.16. The nitrogen content can be changed within a certain range without causing changes in the structure of TiN.
 

Titanium nitride formula TiN, TiN powder is generally yellowish-brown, the ultrafine TiN powder is black, and TiN crystal is golden yellow. TiN powder has a melting point of 2950°C, a density of 5.43-5.44g/cm3, Mohs hardness of 8-9, and good thermal shock resistance. The melting point of TiN is higher than that of most transition metal nitrides, but the density is lower than most metal nitrides, so it is a very characteristic heat-resistant material.
 

Titanium Nitride Uses:

Titanium nitride (TiN) is a fairly stable compound that does not react with metals such as iron, chromium, calcium, and magnesium at high temperatures, and TiN crucibles do not react with acidic or alkaline slag under CO and N2 atmospheres, so TiN Crucible is an excellent container to study the interaction between molten steel and some elements. TiN loses nitrogen by heating in a vacuum and produces titanium nitride with low nitrogen content.
 

Titanium nitride powder has an attractive golden yellow color, high melting point, high hardness, good chemical stability, small wetting with metal, and has high electrical conductivity and superconductivity, which can be applied to high-temperature structural materials and superconductivity material.

Titanium nitride (TiN), as a new type of multifunctional cermet material, has excellent characteristics such as high melting point, high hardness, wear resistance, good chemical stability, good electrical and thermal conductivity, and good optical properties. Its melting point is 2930-2950℃, it is a good conductor of heat and electricity, and it has superconductivity at low temperatures. It is a material for manufacturing jet engines. With the development and breakthrough of science and technology, it plays a different role in many fields. The unique golden yellow metallic luster makes titanium nitride also have applications in the field of gold decoration.
 

(1) Application in tool manufacturing

The titanium nitride ceramic coating has a golden appearance. Although it has the advantage of optimizing the appearance when coated on the tool, its main function is not for decoration. It has a hardness value of 2500 or higher in Webster hardness (HV). The thickness of the coating on the tool is generally 3 to 5 microns, which has higher wear resistance and heat resistance and longer service life than the original product that has not been coated. Applying this technology to mechanical equipment in industrial production, such as coating titanium nitride on gear hobs, its life can be extended by 3 to 4 times, and the cutting speed or feed can be increased more when cutting gears—thereby reducing material machining time. The utilization rate of coated high-speed tools in industrially developed countries has accounted for 70% of high-speed tools. Almost all of the automotive industry uses coated high-speed steel knives to process gears, and the rolling speed can reach 70~150m/mm.


In our country, a major national scientific and technological project hosted by Professor Liu Ning, School of Materials Science and Engineering, the Hefei University of Technology in 2005 was to study nano-TiN and AlN modified titanium carbide-based cermet tools. The research shows that the TiC-based cermet cutter modified by nano-TiN has excellent mechanical properties and is a new type of cutter with high technical content and high added value. At the same time, after more than four months of use by users, it has been shown that this tool can partially replace carbide tools such as YC8 and YT15 in the field of cutting processing. The tool life is more than doubled, and the production cost is comparable to or slightly lower than YC8 tools. This research has enabled the development of new cermet tools made of nanomaterials in my country, and it also marks new progress in the study of special ceramics in our country.
 

(2) Application in biomedicine

The occluder used to treat atrial septal defect, ventricular septal defect, and patent ductus arteriosus in congenital heart disease has been widely used in clinical medicine as an implant for interventional therapy. However, most of the conventional concentric occluders are made of nickel-titanium alloy materials, containing up to 55% nickel, and excessive nickel can cause allergies and poisoning to the human body, and the long-term effect is more likely to induce cancer, and ordinary nickel-titanium alloy seals The purifying membrane on the surface of the nickel-titanium alloy of the occluder can be destroyed. In the complex human body environment, the internal nickel ion release will increase the content of nickel, which further leads to the deterioration of the tissue compatibility of the occluder.
 

Related research shows that because titanium nitride (TiN) is a material with good biocompatibility (once used for coronary stents), thrombogenicity is much lower than nickel-titanium itself. As early as 2004, Xianjian Technology (Shenzhen) Co., Ltd. developed a Cera ceramic membrane occluder using high-energy ion precipitation coating technology for this medical problem. Based on the design of the original nickel-titanium alloy occluder Maintain the design of the original room septal occlusion device, interventricular septal occlusion device, and arterial catheter occlusion device, using plasma technology to uniformly wrap a layer of titanium nitride TiN film on the surface of its nickel-titanium alloy, using ion technology to make the metal The combination of titanium coating and C, N, O, etc. is converted into a biological coating, which greatly improves the corrosion resistance of the occluder and the compatibility of biological tissue and blood.
 

According to the animal experiment data comparison between Cera ceramic membrane occluder and ordinary nickel-titanium occluder: Cera ceramic membrane occluder is far superior to ordinary nickel-titanium occluder in terms of cell crawling growth performance. Improving the repair of congenital heart disease defects while significantly reducing the risk of thrombosis, platelet adhesion, and hemolysis rate is also much lower than ordinary nickel-titanium occluders. At present, the Cera occluder has been approved by regions and countries, including the European Union, India, Brazil, and Russia, and has been used in thousands of patients with congenital heart disease.

(3) Application of the film on the front block of the car

Today's domestic car owners seem to have become the standard for attaching a heat-insulating protective film to their car after purchasing a car. The film in the main radiation area of ​​the car's front windshield is even more important. After all, the car film has a part that blocks ultraviolet rays and blocks. Heat and prevent injuries and glare caused by the sudden burst of glass and reduce the damage caused by ultraviolet radiation in objects and people in the car. At present, there are many types of automobile thermal insulation films on the market, which are different in material function, service life, and effective presentation. Based on nano-titanium nitride, the combination of magnetron sputtering technology and metal nitriding technology produces a nano-ceramic film which is not only durable, not easy to corrode, but also has the advantages of not shielding mobile phone signals and good heat dissipation, product performance To a large extent, and it is superior to other types of automotive insulation films. The earliest nano-ceramic insulation film is an amber optical nano-ceramic insulation film developed by German Shaohua Technology Company in 2001, which is used in marine, architectural, and automotive glass films.
 

The difference between nano-ceramic insulation film and metal insulation film is as follows:
 

1. Sunscreen and heat insulation are different

The heat dissipation of the metal film is worse than that of the ceramic film, the heat insulation effect is general, and the reflection rate is higher. The ceramic membrane achieves the purpose of heat insulation through the selective filtering function of the solar spectrum. The heat insulation is far more than the metal, the reflection rate is lower, and the stability is excellent.
 

2. Different signal passing rates

A key difference between the metal film and the ceramic film is the barrier rate to the signal. The metal film interferes with imported GPS. It is also an ETC (non-stop electronic toll collection system), which is easy to affect the passage of various signals. The metal film is generally divided into a single layer The metal film and the multi-layer metal film, although the multi-layer metal film is superior to the single-layer metal film in heat insulation, because of its deeper thickness, the signal shielding becomes more serious. The ceramic film will not shield the signal after removing the metal characteristics.
 

3. Different oxidative shelf life

The metal film is easy to oxidize, and the shelf life is slightly shorter, while the chemical nature of the ceramic film is relatively stable, it is not easy to oxidize, and it can withstand acid and alkali organic solvents, which can have a long service life. The shelf life of general ceramic thermal insulation film is ten years, and that of the metal thermal insulation film is five years.
 

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