【摘要】 基于多物理场活化烧结微成形技术(Micro-FAST)对TC4钛合金球形粉末进行烧结,制备出内径2 mm、外径4 mm、厚度1.5 mm的非标微型圆螺母零件,并研究了保温时间对烧结试样的致密化程度和力学性能的影响。在烧结温度1000℃、升温速率30℃/s、外压力75 MPa的条件下,当保温时间为360 s时试样的相对密度和平均纳米硬度最高,分别达到98.3%和6.699 GPa。适当地延长保温时间可以大幅减少烧结试样表面残余孔洞的数量,降低孔隙率,使微观组织更加均匀,从而提高致密化程度和力学性能。更多还原

【Abstract】 Based on multi-physical field activated sintering micro-forming technique(Micro-FAST), the spherical TC4 titanium alloy powder was sintered, and the non-standard micro-nut parts with the dimensions of 2 mm in the inside diameter, 4 mm in the outside diameter and 1.5 mm in the thickness were prepared. The influence of holding time on the densification degree and mechanical properties of sintered specimens were also studied. Under the sintering temperature of 1000 ℃, temperature rise rate of 30 ℃/s and external pressure of 75 MPa, the relative density and average nanometer hardness of the specimen reach 98.3% and 6.699 GPa, respectively at the holding time of 360 s. The number of residual holes on the surface of sintered specimens can be greatly reduced by extending the heat preservation time, and the porosity can be reduced, so that the microstructure can be more uniform, thus improving the degree of densification and mechanical properties.更多还原