离心成型法制备Al_2O_3/Ni功能梯度材料及性能表征

PROCESSING OF AL_2O_3/Ni FUNCTIONALLY GRADIENT COMPOSITES BY CENTRIFUGAL COMPACTION

用离心成型法制备了Al2O3/Ni功能梯度材料,并研究了料浆调制工艺、制备参数和梯度材料的力学性能。结果表明,良好的料浆的最佳流动性配比为粘结剂(聚乙二醇)含量为2mass%、固相含量为63vol.%、球磨时间为36h。经离心成型—真空烧结(1400℃,2h)可获得致密、组元宏观连续过渡的Al2O3/Ni梯度材料。该复合材料孔隙率低,力学性能好,抗弯强度可达321MPa。

In this paper,A1203/Ni functionally gradient composites were fabricated by centrifugal compaction method and the slurry preparation ,centrifugal compaction mechanism and mechanical properties of the compos- ites were investigated. The results showed that slurry with good fluidity can be produced when the binder con- tent, solid content and milling time was 2 mass% ,63 vol.% and 36 h ,respectively.A12O3/Ni functionally gradient composites were produced by vacuum sintering at 1400 ℃ for 2 hours.The composites revealed relatively better mechanical properties with lower pore content and higher bending strength of 321 MPa.