翻訳と辞書 Words near each other ・ Aluminium gallium indium phosphide ・ Aluminium gallium nitride ・ Aluminium gallium phosphide ・ Aluminium glycinate ・ Aluminium granules ・ Aluminium Hormozgan F.C. ・ Aluminium hydride ・ Aluminium hydroxide ・ Aluminium hydroxide oxide ・ Aluminium in Africa ・ Aluminium indium arsenide ・ Aluminium Industrie Vaassen BV v Romalpa Aluminium Ltd ・ Aluminium industry in the United States ・ Aluminium iodide ・ Aluminium isopropoxide ・ Aluminium magnesium boride ・ Aluminium molybdate ・ Aluminium monochloride ・ Aluminium monofluoride ・ Aluminium monoiodide ・ Aluminium monostearate ・ Aluminium Nag Hammâdi ・ Aluminium nicotinate ・ Aluminium nitrate ・ Aluminium nitride ・ Aluminium of Greece ・ Aluminium oxide ・ Aluminium oxide (data page) ・ Aluminium oxides ・ Aluminium oxynitride Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Aluminium magnesium boride ： ウィキペディア英語版 Aluminium magnesium boride Aluminum magnesium boride or BAM is a chemical compound of aluminium, magnesium and boron. Whereas its nominal formula is AlMgB14, the chemical composition is closer to Al0.75Mg0.75B14. It is a ceramic alloy that is highly resistive to wear and has a low coefficient of sliding friction, reaching a record value of 0.02 in lubricated AlMgB14−TiB2 composites. First reported in 1970, BAM has an orthorhombic structure with four icosahedral B12 units per unit cell.〔 This ultrahard material has a coefficient of thermal expansion comparable to that of other widely used materials such as steel and concrete. ==Synthesis== BAM powders are produced by heating a nearly stoichiometric mixture of boron, aluminium and magnesium for a few hours at a temperature in the range 900–1500 °C. Spurious phases are then dissolved in hot hydrochloric acid.〔〔 To ease the reaction and make the product more homogeneous, the starting mixture can be processed in a high-energy ball mill. All pretreatments are carried out in a dry, inert atmosphere to avoid oxidation of the metal powders.〔〔 BAM films can be coated on silicon or metals by pulsed laser deposition, using AlMgB14 powder as a target,〔 whereas bulk samples are obtained by sintering the powder.〔 BAM usually contains small amounts of impurity elements (e.g., oxygen and iron) that enter the material during preparation. It is thought that the presence of iron (most often introduced as wear debris from mill vials and media) serves as a sintering aid. BAM can be alloyed with silicon, phosphorus, carbon, titanium diboride (TiB2), aluminium nitride (AlN), titanium carbide (TiC) or boron nitride (BN).〔〔 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 magnesium boride」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.