(中南大學 粉末冶金國家重點實驗室，長沙 410083)
摘 要: 結合模板浸漬和粉末冶金燒結法，制備出具有良好孔隙性能和力學性能的多孔Nb-Ti合金。采用X射線衍射分析儀(XRD)、力學試驗機、體視顯微鏡(SM)以及掃描電子顯微鏡(SEM)，研究Ti含量(0~15%，質(zhì)量分數(shù))對多孔Nb-Ti合金成分、力學性能、孔隙結構及微觀形貌的影響。結果表明：Nb-Ti合金燒結過程完全，孔隙三維連通程度高，孔隙率為68.50%。隨Ti含量從0增加到15%，合金的力學性能發(fā)生明顯變化，其中抗壓強度從(27.6±0.872) MPa增加到(59.3±1.354) MPa后降為(33.7±1.045) MPa，彈性模量從(0.21±0.0136) GPa增加到(0.46±0.0191) GPa。合金孔隙結構均勻化和三維連通程度增加，孔隙結構從塊狀轉(zhuǎn)變?yōu)榉涓C狀，顆粒間燒結頸長大，結合變緊密，Ti顆粒對Nb-Ti合金燒結的促進作用明顯增強。多孔Nb-10Ti合金的孔隙形貌與松質(zhì)骨類似，力學性能與人體松質(zhì)骨相匹配，適合于醫(yī)學植入應用。
關鍵字: Nb-Ti合金；多孔金屬；力學性能；孔隙率；微觀結構
（National Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:Porous Nb-Ti alloys, possessing good mechanical and pore property, were fabricated by the combination of slurry impregnation with polymer sponge and powder metallurgy sintering method. X-ray diffractometer (XRD), mechanical testing machine, stereoscopic microscope (SM) and scanning electron microscope (SEM) were utilized to identify the composition, mechanical properties, porous structure and microstructure of the porous Nb-Ti alloys with Ti contents ranging from 0 to 15% (mass fraction). The results show that, the alloys are sintered completely, the pore with highly three-dimensional connected structure is remained and the porosity is 68.50%. The mechanical properties of the alloys change obviously, the compressive strength increases from (27.6±0.872) MPa to (59.3±1.354) MPa, and then decreases to (33.7±1.045) MPa with the Ti contents increasing from 0 to 15%, meanwhile the elastic modulus increases from (0.21±0.0136) GPa to (0.46±0.0191) GPa. Pore structures of the alloys are in more even distribution and own cellular construction, sintering neck of particles grows and particles combine more closely, and the accelerating action of Ti particles on the sintering of Nb-Ti alloys is obviously strengthened. The mechanical properties and pore morphology of porous Nb-10Ti alloy are similar to those of human cancellous bone. The Nb-10Ti alloy is suitable for clinical application.
Key words: Nb-Ti alloy; porous metals; mechanical property; porosity; microstructure
