… Nitriding is broadly divided into gas nitriding and liquid nitriding, depending on the type of nitrogen source. (1) Gas nitriding When the material to be treated is heated and held in an ammonia stream at 500-550°C for 20-100 hours, the ammonia decomposes to produce nascent nitrogen and hydrogen, which then combines with iron to produce nitrides such as Fe 2 N(ε) and Fe 4 N(γ′), forming a nitride layer. This nitride layer is very hard, with a Vickers hardness of about 1000, and a highly wear-resistant surface layer is formed. … *Some of the terminology used in relation to the "gas nitriding method" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…窒化は窒素源の種類により気体(ガス)窒化,液体窒化に大別される。 (1)気体(ガス)窒化法gas nitriding 被処理材を500~550℃のアンモニア気流中で20~100時間加熱保持すると,アンモニアが分解して発生期の窒素と水素を生じ,この窒素が鉄と化合してFe2N(ε),Fe4N(γ′)などの窒化物をつくり,窒化層を形成する。この窒化層が非常に硬くビッカース硬さで1000くらいになり,耐摩耗性に富んだ表面層が形成される。… ※「気体窒化法」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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