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; nanometer powder; sintering; kinetics; activation energy 钼是一种难熔金属,具有强度和硬度高,抗腐蚀,导热导电性能好的特点[1].在钼基体上加入耐高温的Al2O3陶瓷硬质颗粒制得的Al2O3/Mo复合材料,综合了钼基体和Al2O3增强相各自的优点,可作为高温耐磨结构材料使用[2-4].目前,大多数钼基合金产品采用粉末冶金工艺生产,即通过机械压制和后序... of the initial stage of sintering from shrinkage data: Simultaneous determination of activation energy and kinetic model from a single nonisothermal experiment[J]. J Am Ceram Soc, 2002, 85: 763-768. [15] SATO......
nitrogen austenite only. The results show that solid solution nitriding is a process that nitrogen absolutely diffuses in the austenite. The diffusing activation energy in the conditions of PN2 = 0.15MPa and 1050℃~ 1200℃ is 186.6K J/mol. 关键词:duplex stainless steel; solid solution nitriding; orthogonal test; diffusion activation energy; [全文内容正在添加中] ......
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; mechanical property; activation energy 铝锂合金属于可热处理强化型铝合金,与传统的2xxx(2024等),7xxx(7075等)系和碳纤维增强铝基复合材料相比,铝锂合金具有低密度,高比强度,高比模量等优点,因而作为承力构件和刚度构件而广泛应用于军事,航空航天等领域[1-4].在二元Al-Li合金中加入主要合金化元素Cu和微合金化元素Mg,Ag,Zr等可显著改善其... and σ(Al5Cu6Mg2) phase are the major precipitates in 2A97 alloy. According to the DSC curves at various heating rates, the activation energies of T1 phases by Kissinger method is 75.9 kJ/mol. To sum up......
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+ ) to c (Fe 3+ ) . Keyword: red mud; stability of glass; crystallization activation energy; Received: 1999-08-26 赤泥是铝工业生产中利用铝土矿生产氧化铝的废弃物, 每生产1 t氧化铝排放... activation energies obtained from both Augis Bennett method and modified Kissinger method are almost the same. The stability of red mud glasses was evaluated by the crystallization kinetics criterion k y (T......
that the electrical conducting is ascribed to thermal activation in the range of 100?300 K. The minimal value of the activation energy is estimated 0.085 eV. The electrical conductivity of CuxAlO2 ceramics mainly depends on the density of the samples in the investigating range. Key words: CuAlO2 ceramics; delafossite; density; electrical conductivity; activation energy ......
% with a m-value of 0.35was obtained at 613K and a initial strain rate of 1.67×10-2 S-1. The apparent activation energy (98k J/mol) approximates that for grain boundary diffusion (92k J/mol)in magnesium... an important role in the superplastic deformation. Key words:magnesium matrix composite; superplasticity; apparent activation energy; [全文内容正在添加中] ......
