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基于化学反应造孔和物理占位造孔的联合作用,发展了一种新型Ti Al金属间化合物多孔材料的制备工艺,具体可用均混、压制、脱溶、烧结4个阶段来描述。该工艺实现了毫/微米双孔结构Ti Al多孔材料的制备,其中微米孔由Kirkendall效应产生,毫米孔由物理占位造孔颗粒实现。材料具有完全的通孔结构,孔洞分布均匀,且孔隙率、孔径、孔型、孔结构可控,最高孔隙率可达90%。准静态压缩力学性能测试表明,Ti Al多孔材料属于脆性多孔材料,具有典型的脆性破坏断裂机制,其屈服强度与相对密度的关系可通过Gibson-Ashby正六面体单胞模型来解释。
Based on the combined action of chemical reaction and hole occupying, a novel TiAl intermetallic compound porous material has been developed, which can be described by four stages of homogenization, pressing, desolvation and sintering. This process enables the preparation of a Ti / Al porous material of a two-hole structure of millimoles / micron in which the micropores are created by the Kirkendall effect and the millimeter holes are made of physically occupied pore-forming particles. The material has a complete through-hole structure, holes are evenly distributed, and the porosity, pore size, pore type, pore structure controllable, the highest porosity up to 90%. Quasi-static compressive mechanical tests show that TiAl porous materials are brittle porous materials with typical brittle fracture mechanism. The relationship between yield strength and relative density can be explained by Gibson-Ashby hexahedron single cell model.