title: Study of the effect of the silver content on the structural and mechanical behavior of Ag-ZrCN coatings for orthopedic prostheses.
abstract: With the increase of elderly population and health problems that are arising nowadays, hip joint prostheses are being widely used. However, it is estimated that 20% of hip replacement surgeries simply fails after few years, mainly due to wear fatigue. Bearing this in mind, this work reports on the development of new coatings that are able to sustain long and innocuous life inside the patient, which will confer to the usual biomaterials improved physical, mechanical and tribological properties. In particular, the development of multifunctional coatings based on Ag-ZrCN, prepared by DC reactive magnetron sputtering using two targets, Zr and a modified Zr target, in an Ar+C2H2+N2 atmosphere. Silver pellets were placed in the erosion area of the alloyed Zr target in order to obtain a silver content up to 8 at.%. The structural results obtained by x-ray diffraction show that the coatings crystallize in a NaCl crystal structure typical of ZrC1-xNx. The increase of Ag content promoted the formation of an additional a-CNx amorphous phase, besides a silver crystalline phase. Hardness is decreasing, as increasing silver content. Despite the low thicknesses, adhesion values (LC3) can be considered as good. Dynamic fatigue results suggest that these coatings system can be a real asset in terms of mechanical properties, by improving the performance of usual Stainless Steel 316 L biomaterials.
authors: GRF-CFUM, University of Minho, Campus of Azurém, 4800-058 Guimarães, Portugal; CEB, Centre for Biological Engineering, University of Minho, Campus of Gualtar, 4700-057, Portugal. Electronic address: isabelferreri@gmail.com.
authors: I
authors: I
authors: Ferreri
authors: GRF-CFUM, University of Minho, Campus of Azurém, 4800-058 Guimarães, Portugal.
authors: V
authors: V
authors: Lopes
authors: GRF-CFUM, University of Minho, Campus of Azurém, 4800-058 Guimarães, Portugal; SEG-CEMUC, Mechanical Engineering Department, University of Coimbra, 3030-788 Coimbra.
authors: S
authors: S
authors: Calderon V
authors: GRF-CFUM, University of Minho, Campus of Azurém, 4800-058 Guimarães, Portugal.
authors: C J
authors: CJ
authors: Tavares
authors: SEG-CEMUC, Mechanical Engineering Department, University of Coimbra, 3030-788 Coimbra.
authors: A
authors: A
authors: Cavaleiro
authors: GRF-CFUM, University of Minho, Campus of Azurém, 4800-058 Guimarães, Portugal; SEG-CEMUC, Mechanical Engineering Department, University of Coimbra, 3030-788 Coimbra.
authors: S
authors: S
authors: Carvalho
mesh_terms: D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D006622:Hip Prosthesis; D008422:Materials Testing; D055595:Mechanical Phenomena; D053761:Nanocomposites / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D015040:Zirconium / Q000737:chemistry*
chemical_list: D020099:Coated Materials, Biocompatible; D012834:Silver; D015040:Zirconium
keywords: Sputtering; Thin films; adhesion; dynamic fatigue tests; plastic deformation