Processing of ZrB2-15wt%Cu Composites Via Spark Plasma Sintering

作者：Gong Daoliang; Zhu Shizhen^*; Xu Qiang

来源：Rare Metal Materials and Engineering, 2013, 42: 574-577.

• spark plasma sintering
• ZrB2-Cu composites
• microstructure
• mechanical properties

ZrB2-15wt%Cu composites were prepared via spark plasma sintering. Their phase and microstructures were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The effect of different sintering temperatures on sintering behavior, microstructure and mechanical properties was discussed. The results show that the composites begin to shrink quickly at 1300 degrees C. A high density of ZrB2-15wt%Cu is obtained by sintering at 1650 degrees C for 5 min. The microstructures of the composites are uniform and the grains unobviously grow up. The Cu phase is mainly distributed among the ceramic particles. And some of the Cu phase debond with the ceramic particles presented by the fracture morphology. The fracture mode is mainly of the intergranular fracture at ZrB2/Cu interface that leads to some tearing ridges existing in the composites sintered at 1600 degrees C and 1650 degrees C, indicating the plastic fracture of metal binder phase. The mechanical properties of the composites are improved with increasing the sintering temperature. Satisfactory mechanical properties with 7.0 MPa.m(1/2), bending strength of 593.33 MPa and microscopic vickers hardness of 10.16 GPa are acquired for the ZrB2-15wt% Cu composite material sintered at 1650 degrees C.

• 出版日期2013-6
• 单位北京理工大学