ANALYSIS OF A FUNCTIONALLY GRADED INTERFACE BETWEEN A NOVEL TITANIUM CARBIDE SURFACE AND TITANIUM ALLOY SUBSTRATE
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Author/Creator ORCID
Date
2023-01-01
Type of Work
Department
Mechanical Engineering
Program
Engineering, Mechanical
Citation of Original Publication
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Access limited to the UMBC community. Item may possibly be obtained via Interlibrary Loan thorugh a local library, pending author/copyright holder's permission.
Distribution Rights granted to UMBC by the author.
Access limited to the UMBC community. Item may possibly be obtained via Interlibrary Loan thorugh a local library, pending author/copyright holder's permission.
Subjects
Abstract
Osteoarthritis (OA) is a painful and frequently debilitating affliction affecting millions of adults in the United States alone. Historically, treatments for OA focused on relieving symptoms through the employment of drug therapies. However, when drugs are no longer effective, then joint replacement, full or partial, is employed.Despite the success of joint replacements, wear of the bearing surface is of concern. Wear can disrupt the normal mechanical function of the implant and cause numerous problems in the body. Particles can cause allergic reactions, pseudotumors, bone
resorption, and aseptic loosening of the implant. Fabrication techniques to make the surface of candidate biomaterials resilient to abrasion and wear continue to be developed.
The purpose of this research was to explore a method to determine for improving the lifespan of artificial joints. A novel micro-textured surface was created through plasma enhanced chemical vapor deposition (CVD) on a Ti6Al4V substrate. The interface between the novel titanium carbide surface and substrate was studied to determine its properties relevan to tribological applications.
The surface consists of crystalline channels with nanocrystalline features. X-ray diffraction (XRD) patterns indicated that the film was composed of titanium carbide (TiC). Mechanical testing indicated that the film is at least 22% harder than the as received material. Grid based indentation and atomic force microscopy (AFM) fast force mapping indicate that there is an integration zone where mechanical properties vary gradually between substrate and thin film. These results were then used to create a molecular dynamics (MD) model and a finite element model (FEM) to evaluate the potential adhesive properties of the novel surface. The MD model showed that ?mixed interface? specimens have greater adhesion than laminate films. The FEM study indicated that functionally gradient specimens resist crack propagation more than homogeneous specimens. These results indicate that the novel surface could improve the life span of artificial joints.