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| Section2 = | Section3 = }} Aluminium oxynitride or AlON is a ceramic composed of aluminium, oxygen and nitrogen. It is marketed under the name ALON by Surmet Corporation.〔Richard L. Gentilman ''et al.'' Transparent aluminum oxynitride and method of manufacture Issue date: May 28, 1985〕 ALON is optically transparent (≥80%) in the near-ultraviolet, visible and midwave-infrared regions of the electromagnetic spectrum. It is 4 times harder than fused silica glass, 85% as hard as sapphire, and nearly 15% harder than magnesium aluminate spinel. Since it has a cubic spinel structure, it can be fabricated to transparent windows, plates, domes, rods, tubes and other forms using conventional ceramic powder processing techniques. AlON is the hardest polycrystalline transparent ceramic available commercially.〔Mohan Ramisetty ''et al.'' (Transparent Polycrystalline Spinels Protect and Defend ), American Ceramic Society Bulletin, vol.92, 2, 20–24 (2013)〕 Combination of optical and mechanical properties makes this material a leading candidate for lightweight high-performance transparent armor applications such as bulletproof and blast-resistant windows and for many military infrared optics. AlON based armor has been shown to stop multiple armor piercing projectiles of up to 50 cal.〔M. Ramisetty ''et al.'' (http://www.photonics.com/Article.aspx?AID=54521 ), Photonics Spectra, Aug 2013〕 It is commercially available in sizes as big as 18x35-inch monolithic windows.〔http://www.prweb.com/releases/2013/5/prweb10774558.htm〕 ==Properties== ;Mechanical〔 *Young modulus 334 GPa *Shear modulus 135 GPa *Poisson ratio 0.24 *Knoop hardness 1800 kg/mm2 (0.2 kg load) *Fracture toughness 2.0 MPa·m1/2 *Flexural strength 0.38–0.7 GPa *Compressive strength 2.68 GPa ;Thermal and optical〔 *Specific heat 0.781 J/(g·°C) *Thermal conductivity 12.3 W/(m·°C) *Thermal expansion coefficient ~4.7/°C *Transparency range 200–5000 nm ALON also appears to be radiation-resistant and resistant to damage from various acids, bases, and water. 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「Aluminium oxynitride」の詳細全文を読む スポンサード リンク
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