Chromium transport through Cr2O3 scales. II. Changes in scale morphology during high vacuum treatment of oxidized chromium specimens
Chromium transport through Cr2O3 scales. II. Changes in scale morphology during high vacuum treatment of oxidized chromium specimens
复制标题
铬通过 Cr2O3 鳞片运输。
DOI：
10.1007/bf00738382
复制
发表时间：
1982
影响因子：
2.2
通讯作者：
P. Kofstad
中科院分区：
文献类型：
--
作者：
K. Lillerud;P. Kofstad
在1200 ° O和1300° O下氧化得到不同厚度Cr_2O_3氧化皮的铬试样在高温下进行了长时间的高真空退火。在高真空退火期间，铬通过氧化皮传输并从氧化皮表面蒸发。最初，由于氧化皮的重结晶和致密化，铬的蒸发速率随时间而降低。在延长的高真空处理的铬蒸发率再次增加，并在规模形态发生重大变化。氧化皮外表面形成氧化物颗粒中的空洞，而颗粒从氧化皮内表面突出。的形态变化被解释在扩散率的差异沿着晶界和通过晶格和所得的变化，表面能沿着的表面。
Chromium specimens oxidized at 1200 and 1300° O to give Cr2O3 scales with varying thicknesses have been high vacuum annealed for extended periods at temperature. During the high vacuum anneal chromium is transported through the scale and evaporates from the scale surface. Initially the rate of chromium evaporation decreases with time as a result of recrystallization and densification of the scale. On extended high vacuum treatment the rate of chromium evaporation again increases and major changes in scale morphology takes place. The outer scale surfaces develop hollows in the oxide grains while the grains protrude from the scale at the inner surfaces. The morphological changes are interpreted in terms of differences in diffusion rates along grain boundaries and through the lattice and resultant variations in surface energy along the surfaces.