The oxidation of the ternary alloy Ni-15Cu-5Al in 1 × 105 Pa pure oxygen at 700 ℃ and 800 ℃ was studied. The results show that the behavior of the Ni-rich alloy is similar to that of the binary Ni-Al alloy with...The oxidation of the ternary alloy Ni-15Cu-5Al in 1 × 105 Pa pure oxygen at 700 ℃ and 800 ℃ was studied. The results show that the behavior of the Ni-rich alloy is similar to that of the binary Ni-Al alloy with the same Al content in the form of an external NiO layer coupled to the internal oxidation of aluminium. The presence of 15%(mole fraction) Cu cannot modify substantially the values of relevant parameters affecting the transition from the internal to the external oxidation of aluminium. The presence of 5 % Al reduces the oxidation rate of the corresponding Ni-Cu alloy during the whole oxidation stages, though 5 % Al is still insufficient to form protective external alumina scales.展开更多
利用固液反应球磨技术制备了Al Cu Co三元合金.分别采用Co球球磨Al 33.2%Cu(此文中的百分比为质量分数),Al 54%Cu(Al2Cu)和Al 70%Cu(AlCu)二元合金熔体,在923K和973K球磨Al 33.2%Cu熔体12h后生成Al65Co15Cu20粉末;在923K和1023K球磨24h...利用固液反应球磨技术制备了Al Cu Co三元合金.分别采用Co球球磨Al 33.2%Cu(此文中的百分比为质量分数),Al 54%Cu(Al2Cu)和Al 70%Cu(AlCu)二元合金熔体,在923K和973K球磨Al 33.2%Cu熔体12h后生成Al65Co15Cu20粉末;在923K和1023K球磨24h后生成Al69Co25Cu6粉末,在893K和993K分别球磨Al 54%Cu(Al2Cu)合金熔体12h和24h后均生成Al65Co15Cu20粉末;在1123K球磨Al 70%Cu合金熔体24h后生成Al65Co15Cu20粉末.采用Al Cu Co固液反应球磨得到的金属间化合物粉末为纳米粒子.同时,对Al Cu Co三元合金相形成的规律进行了研究,对固液反应球磨机理进行了探讨.在固液反应球磨过程中,三元合金产物的元素摩尔比接近于二元母合金中的元素摩尔比;三元合金产物成分中固相第三组元的成分含量与二元母合金熔体成分有很大关系;提高反应球磨温度、延长球磨时间有利于三元合金产物的形成;延长球磨时间,形成的三元合金产物中磨球的成分增加;反应球磨温度超出二元母合金熔点越高,球磨反应越容易进行.展开更多
文摘The oxidation of the ternary alloy Ni-15Cu-5Al in 1 × 105 Pa pure oxygen at 700 ℃ and 800 ℃ was studied. The results show that the behavior of the Ni-rich alloy is similar to that of the binary Ni-Al alloy with the same Al content in the form of an external NiO layer coupled to the internal oxidation of aluminium. The presence of 15%(mole fraction) Cu cannot modify substantially the values of relevant parameters affecting the transition from the internal to the external oxidation of aluminium. The presence of 5 % Al reduces the oxidation rate of the corresponding Ni-Cu alloy during the whole oxidation stages, though 5 % Al is still insufficient to form protective external alumina scales.
文摘利用固液反应球磨技术制备了Al Cu Co三元合金.分别采用Co球球磨Al 33.2%Cu(此文中的百分比为质量分数),Al 54%Cu(Al2Cu)和Al 70%Cu(AlCu)二元合金熔体,在923K和973K球磨Al 33.2%Cu熔体12h后生成Al65Co15Cu20粉末;在923K和1023K球磨24h后生成Al69Co25Cu6粉末,在893K和993K分别球磨Al 54%Cu(Al2Cu)合金熔体12h和24h后均生成Al65Co15Cu20粉末;在1123K球磨Al 70%Cu合金熔体24h后生成Al65Co15Cu20粉末.采用Al Cu Co固液反应球磨得到的金属间化合物粉末为纳米粒子.同时,对Al Cu Co三元合金相形成的规律进行了研究,对固液反应球磨机理进行了探讨.在固液反应球磨过程中,三元合金产物的元素摩尔比接近于二元母合金中的元素摩尔比;三元合金产物成分中固相第三组元的成分含量与二元母合金熔体成分有很大关系;提高反应球磨温度、延长球磨时间有利于三元合金产物的形成;延长球磨时间,形成的三元合金产物中磨球的成分增加;反应球磨温度超出二元母合金熔点越高,球磨反应越容易进行.
