This paper presents the results of obtaining and studying the structure and properties of cermets based on powders of aluminum oxide and nickel–aluminum alloy doped with 0.1 wt % of aluminum–magnesium spinel nanoparticles sintered by the electrospark method on a FCT-HP D 25 unit in argon at t = 1470°C for 30 min. The results of the NiAl–65Al₂O₃ charge TG and DSC analysis at up to 1300°C are presented. It is found that the MgAl₂O₄ spinel in the form of individual nanoparticles (60 nm) or aggregates (less than 700 nm) are present along the grain boundaries of the composite. Internal friction studies at t = 20–900°C and high-temperature X-ray phase analysis at t = 700, 800, and 900°C were carried out to describe the degradation mechanisms of the strength properties of the materials. The effect of nanoparticles on the internal friction of the composite within Δt = 20–900°C in the NiAl–65Al₂O₃–0.1MgAl₂O₄ system is shown. Potential mechanisms for cermet strength-property degradation with increasing temperature are discussed. It is suggested that the appearance of extrema on internal friction curves at high temperatures can be caused by shifted phase boundaries of intermetallic compounds and the oxide component due to different coefficients of thermal expansion (CTE). A positive effect of doping with spinel nanoparticles on the short-term heat resistance of cermets at t = 750°C is found. The study of short-term heat resistance at t = 750°C shows that the sample with nanoparticles is more stable than the unmodified sample, which can be associated with the influence of interfacial hardening zones formed around nanoparticles according to the Obraztsov–Lurie–Belov theory and a number of studies carried out on metal matrices.

中文翻译：

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少量添加MgAl 2 O 4纳米粒子的Ni-Al-O体系金属陶瓷复合材料的制备与研究

本文介绍了基于FCT-HP D 25单元的电火花法烧结掺有0.1 wt％铝镁尖晶石纳米颗粒的氧化铝和镍铝合金粉末的金属陶瓷的获得和研究的金属陶瓷的结构和性能的结果。在氩气中在t = 1470°C的条件下放置30分钟。给出了在最高1300°C时NiAl–65Al ₂ O ₃电荷TG和DSC分析的结果。发现沿着复合材料的晶界存在单个纳米颗粒（60nm）或聚集体（小于700nm）形式的MgAl ₂ O ₄尖晶石。在内部摩擦研究吨= 20-900℃，和高温X射线相位在分析吨分别在700、800和900°C下进行了描述，以描述材料强度特性的降解机理。显示了在NiAl–65Al ₂ O ₃ –0.1MgAl ₂ O ₄系统中，在Δt = 20–900°C时，纳米颗粒对复合材料内部摩擦的影响。讨论了随着温度升高金属陶瓷强度-特性降解的潜在机理。建议由于高温膨胀系数（CTE）不同，金属间化合物和氧化物组分的相界移动可能导致高温下内部摩擦曲线上出现极值。尖晶石纳米粒子掺杂对金属陶瓷短期耐热性的积极影响发现t＝ 750℃。在t = 750°C时的短期耐热性研究表明，具有纳米颗粒的样品比未改性的样品更稳定，这可能与Obraztsov–Lurie–Belov认为，纳米颗粒周围形成的界面硬化区有关理论和对金属基质进行的大量研究。