纳米结构ZrO_2(Y)和ZrO_2(Y)-Al_2O_3粉体低温退火前后的结构和性质

研究等离子体 -化学方法制备的纳米结构 Zr O2 -Y2 O3 和 Zr O2 -Y2 O3-Al2 O3 粉体及其不同温度退火前后的结构、性质变化 .结果表明 ,用这种方法制备的粉体 ,烧结后具有很好的聚合性能 ,聚合结构可达到 1～ 2 μm,且内部晶粒尺寸很小 (2 5～ 35 nm) ;在 12 0 0℃以下退火 ,X射线衍射图谱上没有 Al2 O3 的衍射峰 ;对于两种体系 ,主相 Zr O2 的结构虽大致相同 ,但当低温退火 (<12 0 0℃ )时其在 Zr O2 -Y2 O3 体系中的晶格畸变比在 Zr O2 -Y2 O3-Al2 O3 系统中的变化更大 ;晶粒尺寸 (D)为 10～ 15 nm的粉体几乎没有晶格畸变

Structure and Properties of Nanostructured Y TZP(ZrO _2) and Y TZP Alumina (ZrO_2(Y) Al_2O_3) Powders before and after Being Low temperature Annealed

The structure and properties of nanostructured Y-TZP (ZrO2) and Y-TZP-alumina (ZrO2 (Y)-Al2O3) powders, which were obtained by plasma-chemistry method, before and after being low-temperature annealed were investigated. The results show that after being baked the powders prepared by this method show excellent agglomeration and the agglomerate can reach up to 1 ～ 2 μm in size, and the size of the crystal particles in the agglomerate is very small (only about 25～35 nm).Annealed below 1 200 ℃ the X-ray diffraction pattern of the Y-TZP-alumina powder showed no peak of alumina (Al2O3). The structures of the main phase of both the systems are practically identical, and after being annealed below 1 200 ℃, the microstrain of the lattice in the ZrO2(Y)-system is much big ger than that of the lattice in the Y-TZP-alumina (ZrO2(Y)-Al2O3) system. The powder with the D size 10～15 nm showed no microstrain of its lattice.