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首页> 外文期刊>Key Engineering Materials >Microstructures and Mechanical Properties of Fine-Scale Fibrous Alumina / Zirconia Bi-Phase Composite Fabricated by Co-Extrusion Process
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Microstructures and Mechanical Properties of Fine-Scale Fibrous Alumina / Zirconia Bi-Phase Composite Fabricated by Co-Extrusion Process

机译：共挤工艺制备的细纤维氧化铝/氧化锆双相复合材料的组织和力学性能

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A bundle of feedrod composed of ordinary arranged alumina and zirconia green rods was co-extruded through a 6:1 reduction die. The volume fraction of zirconia phase was varied from 10 to 88 vol%. After the first co-extrusion, the individual pieces were bundled and co-extruded again, reducing the lateral size of each phase and multiplying the number of continuous monofilaments. After a 3rd extrusion step and sintering at 1600℃, crack-free composites with a fiber diameter of ～50 μm were obtained for all compositions. The fracture toughness of the composites was improved by introducing fine second phase filaments into the matrix. The maximum fracture toughness of 6.2 MPa·m~(1/2) was attained in the 3rd co-extruded composite which consisted of 53 vol% alumina and 47 vol% zirconia. Bending strength of the composites was almost the same as that of the monolithic alumina regardless of the composition.
机译：将一束由普通排列的氧化铝和氧化锆生坯组成的给料棒通过6：1还原模头共挤出。氧化锆相的体积分数在10体积％至88体积％之间变化。第一次共挤出后，将各个部件捆在一起并再次共挤出，以减小每个相的横向尺寸并增加连续单丝的数量。经过第三次挤出步骤并在1600℃下烧结，所有组合物均获得了纤维直径约为50μm的无裂纹复合材料。通过将细的第二相细丝引入基质中，可以提高复合材料的断裂韧性。在由53％（体积）的氧化铝和47％（体积）的氧化锆组成的第三次共挤出复合材料中，其最大断裂韧性为6.2MPa·m〜（1/2）。无论组成如何，复合材料的弯曲强度几乎都与整体式氧化铝相同。

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