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首页> 外文会议>International Conference on Self-Formation Theory and Applications; 20031126-20031128; Vilnius; LT >The Role of Processes on the Surface in Organization of Long Range Mass-Transport in the Bulk
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The Role of Processes on the Surface in Organization of Long Range Mass-Transport in the Bulk

机译：表面过程在散装远距离大规模运输组织中的作用

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摘要

Yttria-stabilized zirconia (YSZ) coatings were synthesized using dc magnetron sputter deposition of Y/Zr layers followed by thermal treatment in the range of temperatures 600-1000℃ at atmospheric pressure in air. The characterization of YSZ coating structure was carried out by X-ray diffraction. The secondary ion mass-spectrometry analysis was used for the recording of depth profiles of the most important elements in coatings and at interface. The conducted analysis showed that processes on the surface play a dominant role in the synthesis mechanism of YSZ coatings homogeneous in structure and composition during the thermal oxidation. The excess of surface thermodynamic potentials supports an intensive intermixing across Y/Zr layers with continuous supply of oxygen through the surface. Under highly non-equilibrium conditions on the surface, the adatoms are driven into grain boundaries of crystallites and result in high compressive stress in grains. The stress relaxation initiates the plastic flow of matrix material with incorporation of oxygen atoms. Thermally activated dislocation glide is considered as the dominant plastic-deformation mechanism in these materials.
机译：使用直流磁控溅射Y / Zr层，然后在大气中大气压下在600-1000℃的温度范围内进行热处理，合成了氧化钇稳定的氧化锆（YSZ）涂层。通过X射线衍射对YSZ涂层结构进行表征。二次离子质谱分析用于记录涂层和界面中最重要元素的深度分布。进行的分析表明，表面过程在热氧化过程中在结构和成分均一的YSZ涂层的合成机理中起着主导作用。过量的表面热力学势能支持在Y / Zr层之间的强烈混合，并通过表面连续供氧。在表面上高度不平衡的条件下，吸附原子被驱动进入微晶的晶界，并导致晶粒中的高压缩应力。应力松弛通过引入氧原子引发基质材料的塑性流动。在这些材料中，热活化位错滑移被认为是主要的塑性变形机制。

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