氟化镧对多孔钛的影响研究

Research on the Effect of Lanthanum Fluoride on Porous Titanium

采用添加造孔剂法制备多孔钛,并且加入微量氟化镧以期得到高孔隙率高强度的多孔钛。选取三种不同粒径的钛粉做为原料,分别制备多孔钛,并且加入氟化镧探究其对多孔钛的影响效果。随着钛粉粒径的减小,多孔钛的开孔率、孔隙率随着下降,孔径尺寸略有减小;且多孔钛的抗压强度、弹性模量和抗弯强度随之增强,但不同粒径的多孔钛,氟化镧的增加效果不同,而细化晶粒是氟化镧能增强多孔钛力学性能的原因。综合考虑,C组(粒径最小)制备所得的多孔钛力学性能最佳,其中氟化镧的添加量为0.3%(质量分数)时抗压强度、弹性模量分别为157.84 MPa和3.73 GPa,抗弯强度为66.62 MPa。

Porous titanium was fabricated by space holder technique with NH4HCO3 as the space holder and lanthanum fluoride （ LaF3 ） was added to obtain high porosity porous titanium with high strength. Three kinds of titanium powders with dif- ferent particle sizes were selected as raw materials to prepare porous titanium, and the effect of LaF3 on porous titanium was re- searched. With the decrease of the size of the titanium powder, the porosity and open porosity of the porous titanium decreased and the pore size decreased slightly. At the same time, the compressive strength, elastic modulus and bending strength of por- ous titanium were enhanced. However, the increasing effect of LaF3 was different from that of porous titanium with different particle size. The LaF3 can enhance the mechanical properties of porous titanium because of refining grain size. The mechani- cal properties of porous titanium prepared by group C （minimum particle size） are the best, the compressive strength and elas- tic modulus with O. 3wt% of LaF3 are 157. 84 MPa and 3.73 GPa, respectively, and the bending strength is 66. 62 MPa.