尿素作为造孔剂制备泡沫钛的结构和力学性能

Microstructure and Mechanical Properties of Titanium Foams Prepared with Carbamide as Space Holder

摘要:

采用针状尿素作为造孔剂，在造孔剂含量介于60%~80%的情况下进行了泡沫钛的制备。通过造孔剂技术成功地制备出孔隙率介于50.2%~71.4%的泡沫钛。扫描电镜结果表明，孔的连通程度随着造孔剂含量的增加而增加，当造孔剂含量超过70%时形成开孔泡沫钛。力学性能测试结果表明，力学性能随着孔隙率的增加而减小，试样的屈服强度、抗压强度和杨氏模量分别介于34.4~146.8 MPa、40.6~193.2 MPa和0.5~3.3 GPa。孔隙率为50.2%和71.4%的泡沫钛的杨氏模量分别匹配于皮质骨和松质骨的模量，理论上可作为潜在的骨替代材料。

Abstract:

Production of Ti foams using acicular carbamide as space holder in the case of spacer content between 60%~80% has been investigated. Ti foams having porosities in the range of 50.2%~71.4% have been manufactured. The SEM microstructure shows that the connectivity degree of macrospores grows with higher spacer content, and Ti foams with open-cell structure are formed when the spacer content is beyond 70%. The compressive tests indicate that the mechanical properties of Ti foams decrease with increasing porosity. The resultant yield strength, compressive strength and Young’s modulus vary in the range of 34.4~146.8 MPa, 40.6~193.2 MPa and 0.5~3.3 GPa, respectively. Ti foams with porosity 50.2% and 71.4% may theoretically serve as potential substituted materials for cortical and cancellous bone, respectively.