造孔剂对医用多孔Ti/16Mg复合材料组织性能的影响  

Effects of pore-forming agents on microstructure and properties of biomedical porous Ti/16Mg composites

作　　者：许莹 赵散玉 夏朋昭 何曜腾 武泽倩 蔡艳青 XU Ying;ZHAO Sanyu;XIA Pengzhao;HE Yaoteng;WU Zeqian;CAI Yanqing(College of Materials Science and Engineering,North China University of Science and Technology,Tangshan 063210,China)

机构地区：[1]华北理工大学材料科学与工程学院,唐山063210

出　　处：《粉末冶金技术》2024年第6期621-631,共11页Powder Metallurgy Technology

基　　金：国家自然科学基金资助项目(51874140);河北省自然科学基金资助项目(C2018209207);大学生创新创业计划项目(X2021222,R2022099)。

摘　　要：采用粉末冶金工艺结合微波烧结法制备了弹性模量接近于人体骨骼、强度符合人体植入物要求的医用多孔Ti/16Mg复合材料。通过扫描电镜、X射线衍射、金相显微镜、压缩试验以及耐腐蚀性测试等手段研究了造孔剂NH_(4)HCO_(3)粒径及添加量(质量分数)对复合材料的微观组织、力学性能和耐腐蚀性能的影响。结果表明:NH_(4)HCO_(3)对多孔Ti/16Mg复合材料的物相组成没有显著影响,试样孔隙随着NH_(4)HCO_(3)粒径的增大而增大,随着NH_(4)HCO_(3)添加量增加,试样孔隙率由16.64%增加到33.09%。当NH_(4)HCO_(3)粒径为165~198μm、质量分数为18%时,多孔Ti/16Mg试样的弹性模量为6.49 GPa、抗压强度为115 MPa,满足人体植入物的力学性能要求。NH_(4)HCO_(3)粒径对复合材料的耐腐蚀性影响不大,在相同粒径条件下,随NH_(4)HCO_(3)质量分数由0增加至24%,复合材料的耐腐蚀性能略有下降,极化电阻由574.528Ω·cm^(‒2)下降到139.236Ω·cm^(‒2)。The biomedical porous Ti/16Mg composite materials with the elastic modulus close to that of human bone and the strength meeting the requirements of human implants were prepared by powder metallurgy combined with microwave sintering method in this paper.The effects of particle size and addition amount(mass fraction)of NH_(4)HCO_(3)pore-forming agents on the microstructure,mechanical properties,and corrosion resistance of the composites were investigated by scanning electron microscopy,X-ray diffraction,metallography,compression test,and corrosion resistance test.The results show that NH_(4)HCO_(3)has no significant effect on the phase composition of porous Ti/16Mg composites.The pore size increases with the increase of NH_(4)HCO_(3)particle size,and the porosity increases from 16.64%to 33.09%with the increase of NH_(4)HCO_(3)mass fraction.When the particle size of NH_(4)HCO_(3)is 165~198μm and the mass fraction is 18%,the elastic modulus of the porous Ti/16Mg composites is 6.49 GPa and the compressive strength is 115 MPa,which can meet the mechanical property requirements of human implants.Particle size of NH_(4)HCO_(3)has little effect on the corrosion resistance of the porous Ti/16Mg composites.With the same particle size,the corrosion resistance of the porous Ti/16Mg composites decreases slightly and the polarization resistance decreases from 574.528Ω·cm^(‒2)to 139.236Ω·cm^(‒2)with the mass fraction of NH_(4)HCO_(3)increasing from 0 to 24%.

关 键 词：造孔剂 多孔钛合金 微观组织 力学性能 耐腐蚀性 

分 类 号：TG146.2[一般工业技术—材料科学与工程]