粉末冶金制备的Ti35Nb2.5Sn5HA生物复合材料的组织与性能研究

摘要

A novel /3 type Ti -35wt% Nb -2. 5wt% Sn/5wt% Hydroxyapitite( HA) which is biocompatible composite without Al, V noxious elements was fabricated by pulsed current activated sintering (PCAS) at 1 100 t under 60 Mpa using high energy mechanical milling ( HEMM ). The microstructures of Ti35Nb2. 5Sn/10HA powder particles and bulk composite sintered from the milled powders were studied. Results indicated that ball milling to 8 h led to the a-Ti phase transform into/3-Ti phase, after ball milling for 12 h, almost all Ti transform into/J-Ti phase, the particle size of composite powders ball milled for 12 h was just about 500 nra, the particle size of sintered composite was about 200 nm, so nanostructure particles were obtained. The hardness and relative density of the sintered composites both increase with increasing the ball milling time.%采用高能机械球磨和脉冲电流活化烧结方法制备了一种新型的不含Al、V等有毒元素的β钛合金基体的Ti35 Nb2.5Sn5HA生物复合材料.研究了不同机械球磨时间球磨的Ti35 Nb2.5Sn5HA粉末以及用这几种粉末烧结制备的样品微观组织和显微硬度变化,球磨时间对烧结复合材料的微观组织和性能的影响.结果表明:随着球磨时间的增加,Ti35Nb2.5Sn5HA粉末的颗粒尺寸逐渐减小,Nb和Sn开始与Ti发生固溶,形成Ti的过饱和固溶体,而且α-Ti也开始向β-Ti转化.当球磨时间达到12h,球磨粉末中α-Ti完全转化为β-Ti,粉末颗粒的平均尺寸为500 nm左右.12 h球磨的粉末烧结制备的复合材料具有超细晶粒尺寸,晶粒平均尺寸为200 nm,这种复合材料的维氏显微硬度可以达到10 187.3 MPa.