Park Chan-Young, Yang Young-Hwan, Kim Seong-Won, Lee Sung-Min, Kim Hyung-Tae, Jang Byung-Koog, Lim Dae-Soon, Oh Yoon-Suk
J Nanosci Nanotechnol. 2014 Nov;14(11):8659-64. doi: 10.1166/jnn.2014.10000.
The effect of a 5 mol% La2O3 addition on the forming behavior and compositional variation at interface between a 4 mol% Yttria (Y2O3) stabilized ZrO2 (4YSZ) top coat and bond coat (NiCrAlY) as a thermal barrier coating (TBC) has been investigated. Top coats were deposited by electron beam physical vapor deposition (EB PVD) onto a super alloy (Ni-Cr-Co-Al) substrate without pre-oxidation of the bond coat. Top coats are found to consist of dense columnar grains with a thin interdiffusion layer between metallic bond coats. In the as-received 4YSZ coating, a thin interdiffusion zone at the interface between the top and bond coats was found to consist of a Ni-Zr intermetallic compound with a reduced quantity of Y, Al or O elements. On the other hand, in the case of an interdiffusion area of 5 mol% La2O3-added 4YSZ coating, it was found that the complicated composition and structure with La-added YSZ and Ni-Al rich compounds separately. The thermal conductivity of 5 mol% La2O3-added 4YSZ coating (- 1.6 W/m x k at 1100 degrees C) was lower than a 4YSZ coating (- 3.2 W/m x k at 1100 degrees C) alone.
研究了添加5 mol% La2O3对作为热障涂层（TBC）的4 mol%氧化钇（Y2O3）稳定氧化锆（4YSZ）顶层涂层与粘结层（NiCrAlY）之间界面处的形成行为和成分变化的影响。通过电子束物理气相沉积（EB PVD）将顶层涂层沉积在未经粘结层预氧化的高温合金（Ni-Cr-Co-Al）基体上。发现顶层涂层由致密的柱状晶粒组成，在金属粘结层之间有一个薄的互扩散层。在原样的4YSZ涂层中，发现顶层涂层与粘结层之间界面处的一个薄互扩散区由一种含Y、Al或O元素量减少的Ni-Zr金属间化合物组成。另一方面，在添加5 mol% La2O3的4YSZ涂层的互扩散区域，发现分别存在添加La的YSZ和富Ni-Al化合物的复杂成分和结构。添加5 mol% La2O3的4YSZ涂层在1100℃时的热导率（-1.6 W/m·k）低于单独的4YSZ涂层（1100℃时为-3.2 W/m·k）。
