Šulhánek Patrik, Drienovský Marián, Černičková Ivona, Ďuriška Libor, Skaudžius Ramūnas, Gerhátová Žaneta, Palcut Marián
Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, J. Bottu 24, 91724 Trnava, Slovakia.
Faculty of Chemistry and Geosciences, Vilnius University, Naugarduko g. 24, 01513 Vilnius, Lithuania.
Materials (Basel). 2020 Jul 15;13(14):3152. doi: 10.3390/ma13143152.
In this work, the high temperature oxidation behavior of AlCo and AlCo alloys (concentration in at.%) is presented. The alloys were prepared by controlled arc-melting of Co and Al granules in high purity argon. The as-solidified alloys were found to consist of several different phases, including structurally complex m-AlCo and Z-AlCo phases. The high temperature oxidation behavior of the alloys was studied by simultaneous thermal analysis in flowing synthetic air at 773-1173 K. A protective AlO scale was formed on the sample surface. A parabolic rate law was observed. The rate constants of the alloys have been found between 1.63 × 10 and 8.83 × 10 g cm s. The experimental activation energies of oxidation are 90 and 123 kJ mol for the AlCo and AlCo alloys, respectively. The oxidation mechanism of the Al-Co alloys is discussed and implications towards practical applications of these alloys at high temperatures are provided.
在本工作中，展示了AlCo及AlCo合金（原子百分比浓度）的高温氧化行为。这些合金通过在高纯氩气中对Co和Al颗粒进行控制电弧熔炼制备而成。发现凝固态合金由几种不同相组成，包括结构复杂的m - AlCo相和Z - AlCo相。通过在773 - 1173 K的流动合成空气中进行同步热分析研究了合金的高温氧化行为。在样品表面形成了保护性的AlO氧化膜。观察到抛物线速率定律。已发现合金的速率常数在1.63×10至8.83×10 g·cm²·s⁻²之间。AlCo和AlCo合金的氧化实验活化能分别为90和123 kJ·mol⁻¹。讨论了Al - Co合金的氧化机理，并给出了这些合金在高温下实际应用的相关启示。
