Lee Young-In, Lee Eui Seon, Oh Sung-Tag
Department of Materials Science and Engineering, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea.
J Nanosci Nanotechnol. 2021 Sep 1;21(9):4955-4958. doi: 10.1166/jnn.2021.19253.
An optimum route to fabricate the Ni-base superalloys with homogeneous dispersion of oxide nanoparticles is investigated. Two methods for developing a uniform dispersion of oxide nanopar-ticles are compared on the basis of the resulting microstructure. Microstructural analysis reveals that the calcined powder from polymeric additive solution with yttrium nitrate and polyvinyl alcohol represented more fine and uniform distribution of Ni, Y and O elements. The densified specimen by spark plasma sintering at 1000 °C using calcined powder exhibits fine microstructure with oxide nanoparticles compared with that using mechanically alloyed powder, presumably by the particle growth or agglomeration prevention from chelating reaction during the calcination step. The oxide particles in the sintered specimen is identified as Y-Al-O phase, formed by the reaction of Y₂O₃ with Al during calcination and sintering.
研究了制备具有均匀分散氧化物纳米颗粒的镍基高温合金的最佳途径。基于所得微观结构，比较了两种使氧化物纳米颗粒均匀分散的方法。微观结构分析表明，由硝酸钇和聚乙烯醇的聚合物添加剂溶液煅烧得到的粉末中，镍、钇和氧元素的分布更细且更均匀。与使用机械合金化粉末相比，使用煅烧粉末在1000℃下通过放电等离子烧结致密化的试样呈现出具有氧化物纳米颗粒的精细微观结构，这可能是由于在煅烧步骤中通过螯合反应防止了颗粒生长或团聚。烧结试样中的氧化物颗粒被鉴定为Y-Al-O相，它是在煅烧和烧结过程中由Y₂O₃与Al反应形成的。
