Zhang Lin, Liu Ye, Chen Xiaowei, Chen Yan, Wang Shengxi, Qin Mingli, Qu Xuanhui
Beijing Advanced Innovation Center for Materials Genome Engineering, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China.
School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China.
Materials (Basel). 2019 Apr 15;12(8):1231. doi: 10.3390/ma12081231.
Low-temperature combustion synthesis was utilized to prepare Co-Ni-W-based oxide dispersion strengthened (ODS) alloy powder. The influence of the U/Co and C/Co ratios on the morphology and specific surface area of the combusted powder was investigated. Particle size, phase constituents, and element distribution of the resulting Co-Ni-W-based ODS alloy powder were characterized. The results indicate that insufficient urea induced no autocombustion reaction, while excess urea and glucose inhibited the combustion reaction. The optimized contents of urea and glucose were around U/Co = 1.2 and C/Co = 1.5, and the specific surface area of the powder reached 43.5 m²/g. The lamellar Co-Ni-W-based ODS alloy powder with particle sizes of 1-21 μm was the soft agglomeration of a high population of nanosized (65 nm) particles. These nanoparticles grew from 65 to 260 nm in the reduction temperature range of 700-900 °C. Homogeneous distribution of Co, Ni, W, and Y in the Co-Ni-W-based ODS alloy powder was achieved.
采用低温燃烧合成法制备了Co-Ni-W基氧化物弥散强化（ODS）合金粉末。研究了U/Co和C/Co比例对燃烧后粉末的形貌和比表面积的影响。对所得Co-Ni-W基ODS合金粉末的粒度、相组成和元素分布进行了表征。结果表明，尿素不足不会引发自燃烧反应，而尿素和葡萄糖过量则会抑制燃烧反应。尿素和葡萄糖的优化含量分别约为U/Co = 1.2和C/Co = 1.5，此时粉末的比表面积达到43.5 m²/g。粒径为1-21μm的层状Co-Ni-W基ODS合金粉末是大量纳米级（65nm）颗粒的软团聚体。在700-900℃的还原温度范围内，这些纳米颗粒从65nm生长到260nm。实现了Co、Ni、W和Y在Co-Ni-W基ODS合金粉末中的均匀分布。
