人工髋关节用复合多孔钛股骨头制备方法的研究

本研究采用等离子旋转电极制取的Tc4钛合金球形粉末,涂覆在致密芯杆上,制成柄部表面多孔层厚度约2mm的复合多孔钛股头。本文着重研究了原始粉末粒度、烧结制度、基体表面粗糙度对复合多孔层的孔径、孔隙度以及多孔层与基体间结合强度的影响,同时还测定了复合多孔钛股头的机械性能。研究结果表明,材料的最大孔径主要取决于原始粉末粒度,并随粉末粒度的增大而线性增加。影响结合强度的主要因素是烧结制度、原始粉末粒度和基体表面粗糙度。其结合强度随烧结温度的提高、保温时间的延长、原始粉末粒度的下降和基体表面粗糙度的增加而增加。孔隙度仅取决于粉末的堆积状态。所获得的复合多孔钛股头的机械性能为σ_b=830~880 MPa,σ_0.2=810~840 MPa,σ=9.5~12.0%,ψ=26.0~33.0%。

A STUDY ON PREPARATION OF MAN-MADE HIPBONE BY USING COMPOSITE POROUS TITANIUM

A porous layer of 2mm thick on the end surface of man-made composite hipbone was cooted with Tc4 spherical Titanium alloy powder prepared by plasma rotating electrode process in present study. The present work emphasised the influences of particle size,sintering process and the roughness of matrix surface on the pore size of composite porous layer, porosity and the bonding strength between porous layer and matrix. The mechanical properties of composite porous man-made hipbone were also tested. Experimental results show that the maximum pore size of materials depends mainly on particle size and increases linearly with increase of particle size.The Key factors influencing bonding strength include sintering process and the roughness of matrix surface. Bonding strength enhances with increase of sintering temperature and its holding time, decrease of particle size and the roughness of matrix surface.Porosity depends only on the piled up condition of powder. The mechanical properties obtained from the preparation of man-made hipbone by using composite porous Titanium: σ_b=830~880 MPa, σ_0.2= 810~840 MPa, δ=9.5~12.0, ψ=26.0~33.0%