CAJ | 학술논문

研究预先真空氧化处理工艺对耐高温涂层的热生长氧化物(TGO)相变的影响，用超音速火焰喷涂技术在镍基合金基底上喷涂 CoCrAlY 耐高温腐蚀涂层，然后对其进行特定的预先真空氧化处理。研究表明：未预先真空氧化处理试样在高温氧化初始阶段，TGO中除了含有 Al2O3，还含有大量的 Cr2O3、CoO和尖晶石类氧化物，而且 Al2O3的形成量主要取决于氧分压。CoCr2O4尖晶石的形成阶段主要在高温氧化的初始高氧分压阶段和随高温氧化进行的化学反应阶段。经过适当的预先真空氧化处理后，TGO 的主要成分为低 Y 含量的 Al2O3，零星分布着高 Y 含量的 Al2O3，未观察到明显的大晶粒尖晶石结构氧化物；随着高温氧化时间的延长，少量多孔状的CoCr2O4尖晶石和Cr2O3零星分布于连续的Al2O3周围。另外，TGO的生长率比未预先真空氧化处理的低。
연구예선진공양화처리공예대내고온도층적열생장양화물(TGO)상변적영향，용초음속화염분도기술재얼기합금기저상분도 CoCrAlY 내고온부식도층，연후대기진행특정적예선진공양화처리。연구표명：미예선진공양화처리시양재고온양화초시계단，TGO중제료함유 Al2O3，환함유대량적 Cr2O3、CoO화첨정석류양화물，이차 Al2O3적형성량주요취결우양분압。CoCr2O4첨정석적형성계단주요재고온양화적초시고양분압계단화수고온양화진행적화학반응계단。경과괄당적예선진공양화처리후，TGO 적주요성분위저 Y 함량적 Al2O3，령성분포착고 Y 함량적 Al2O3，미관찰도명현적대정립첨정석결구양화물；수착고온양화시간적연장，소량다공상적CoCr2O4첨정석화Cr2O3령성분포우련속적Al2O3주위。령외，TGO적생장솔비미예선진공양화처리적저。
The influence of the certain specific vacuum pre-oxidation process on the phase transformation of thermally-grown oxides (TGO) was studied. The CoCrAlY high temperature corrosion resistance coatings were produced onto the nickel-based superalloy substrate by high velocity oxygen fuel (HVOF). It suggests that the TGO usually consists of a great number of chromium oxides, cobalt oxides and spinel oxides besides alumina during the initial period of the high temperature oxidation if the specimens are not subjected to the appropriate vacuum pre-oxidation process. Furthermore, the amount of alumina is strongly dependent on the partial pressure of oxygen;while the CoCr2O4 spinel oxides are usually formed under the conditions of higher partial pressure of oxygen during the initial period and the lower partial pressure of oxygen during the subsequent period of the isothermal oxidation. After the appropriate vacuum pre-oxidation process, the TGO is mainly composed of alumina that contains lower Y element, while alumina that contains higher Y element sporadically distributes, and the spinel oxides cannot be found. After a longer period of the isothermal oxidation, a small amount of porous CoCr2O4 and the chrome oxide sporadically distribute near the continuous alumina. Additionally, after the appropriate vacuum pre-oxidation process, the TGO growth rate is relatively slow.