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Method for producing a protective layer Narabinikaru protective layer for the aluminum containing alloys for use at high temperatures
Method for producing a protective layer Narabinikaru protective layer for the aluminum containing alloys for use at high temperatures
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机译:用于高温使用的含铝合金的保护层Narabinikaru保护层的制造方法
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摘要
Alloys containing aluminium are characterised by an outstanding oxidation resistance at high temperatures, that is based on, inter alia, the formation of a thick and slow-growing aluminium oxide layer on material surfaces. If the formation of the aluminium oxide layer reduces the aluminium content of the alloy so far that a critical aluminium concentration is not reached, no other protective aluminium oxide layer can be formed. This leads disadvantageously to a very rapid breakaway oxidation, and the destruction of the component. This effect is stronger at temperatures above 800° C. due to the fact that, often at this point, metastable Al2O3 modifications, especially &thetas;- or γ-Al2O3, are formed instead of α-Al2O3 that is generally formed at high temperatures. The above-mentioned oxide modifications are disadvantageously characterised by significantly higher growth rates. The invention relates to methods whereby aluminium-containing alloys advantageously form an oxidic covering layer predominantly consisting of α-Al2O3, at a temperature higher than 800° C., especially in the initial stage of oxidation, and thus have a significantly improved long-term behaviour.
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机译:包含铝的合金的特征在于在高温下的优异的抗氧化性,这尤其是基于在材料表面上形成的厚且缓慢生长的氧化铝层。如果氧化铝层的形成降低了合金中的铝含量,以至于没有达到临界的铝浓度,则不能形成其他保护性氧化铝层。不利的是,这导致非常快速的分离氧化和组分的破坏。由于通常在这一点上形成亚稳态的Al2O3修饰,尤其是θ-或γ-Al2O3,而不是通常在高温下形成的α-Al2O3,因此在高于800°C的温度下,这种作用更强。温度。不利地,上述氧化物改性的特征在于明显更高的生长速率。本发明涉及这样的方法,其中含铝合金在高于800℃的温度下,特别是在氧化的初始阶段,有利地形成主要由α-Al2 O 3组成的氧化覆盖层,并因此具有显着改善的长寿命。长期行为。
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