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| Section2 = | Section3 = }} Titanium nitride () (sometimes known as “Tinite” or “TiNite” or “TiN”) is an extremely hard ceramic material, often used as a coating on titanium alloys, steel, carbide, and aluminium components to improve the substrate's surface properties. Applied as a thin coating, TiN is used to harden and protect cutting and sliding surfaces, for decorative purposes (due to its gold appearance), and as a non-toxic exterior for medical implants. In most applications a coating of less than is applied. ==Characteristics== Summary of characteristics *Vickers hardness 2400 *Modulus of elasticity 251 GPa *Thermal conductivity 19.2 W/(m·°C) *Thermal expansion coefficient 9.35×10−6 K−1 *Superconducting transition temperature 5.6 K *Magnetic susceptibility +38×10−6 emu/mol TiN will oxidize at 800 °C at normal atmosphere. It is chemically stable at room temperature and is attacked by hot concentrated acids. ( Chemically stable at 20 degrees Celsius, tested in laboratory. Reference states that the coating will be slowly attacked by concentrated acid solutions with rising temperatures. The book does not reference specific temperatures related to the increase of acidic corrosion, though the reference states that it is inert at 20 degrees Celsius. )〔 TiN has infrared (IR) reflectivity properties, reflecting in a spectrum similar to elemental gold (Au), which gives it a yellowish color. Depending on the substrate material and surface finish, TiN will have a coefficient of friction ranging from 0.4 to 0.9 against another TiN surface (non-lubricated). The typical TiN formation has a crystal structure of NaCl-type with a roughly 1:1 stoichiometry; however TiNx compounds with ''x'' ranging from 0.6 to 1.2 are thermodynamically stable. A thin film of titanium nitride was chilled to near absolute zero converting it into the first known superinsulator, with resistance suddenly increased by a factor of 100,000. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Titanium nitride」の詳細全文を読む スポンサード リンク
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