This paper proposes a new method to estimate the roughness changes from topographic features of microscopic surfaces during an engineering wear process. We demonstrate that the evolution of the significant upcrossings of surface topography is the most efficient way to estimate the roughness changes associated with the small-scale changes during the time of wear process. The motivation of this w...

Abstract The proposed research work is addressed to the study of wear behavior Ultra High Molecular Weight Polyethylene (UHMWPE) under contact with a rounded pin in Ti6Al4V alloy, which largely used for production last generation prosthetic implants by electron beam manufacturing (EBM). tests UHMWPE are carried out dry or presence lubricants fluids that characterized tribological tests, wet‐abi...

The crystallographic texture evolution of ultra high molecular weight polyethylene (UHMWPE) subjected to different strains (up engineering 3.00) under uniaxial tension is presented in this work. A somewhat linear with 60% crystalline region and 40% amorphous has been used study. Wide angle X-ray diffraction utilized study the undeformed deformed UHMWPE samples help pole figures. components have...

Catalytic polymerization in compartmentalized aqueous or non-aqueous media, respectively, with functional-group tolerant Ni(ii) catalysts yields low-entangled UHMWPE.

INTRODUCTION: Radiation cross-linking is used to decrease wear in ultra high molecular weight polyethylene (UHMWPE) as a total joint arthroplasty bearing surface [1,2] but it also reduces its fatigue strength [1]. Current research focus is to improve the fatigue strength of wear and oxidation resistant cross-linked UHMWPEs in order to improve their use in high stress applications and young and ...

BACKGROUND Charnley low-friction torque total hip arthroplasty (THA) remains the gold standard in THA. The main cause for failure is wear of the socket. Highly crosslinked polyethylene (HXLPE) has been associated with reduced wear rates. Also, oxidized zirconium has shown in vitro reduced wear rates. However, to our knowledge, there are no data comparing oxidized zirconium femoral heads with me...

Introduction: Crosslinking of polyethylene has been known for decades to improve the abrasion resistance of the polymer for industrial applications. However, only three applications of this technology have been reported in use in total hip replacements in the orthopaedics literature by Grobbelaar et. al. [1], Oonishi et. al. [2], and Wroblewski et. al. [3]. Recently, the interest in highly cros...

in the present work, a titanium-based ziegler-natta catalyst was employed to synthesize ultra molecular weight polyethylene in a slurry medium. the effect of different parameters such as ethylene pressure, temperature, catalyst composition, and hydrogen pressure was studied. as the results indicate, increasing either [al]/[ti] ratio or temperature causes polymerization rate to go through a maxi...

The silver salts of fatty acids were studied as precursors for the preparation of colloidal dispersions of silver nanoparticles and UHMWPE (ultra-high-molecular-weight polyethylene) composite with silver nanoparticles, as well as the composition, the spectra and SEM (scanning electron microscopy) results. keywords: Silver laurate, silver palmitate, ascorbic acid, differential scanning spectrosc...

For the first time, an ultrathin type of ultra-high molecular weight polyethylene (UHMWPE) membrane only 350 nm thickness is surface modified by direct fluorination and plasma treatments. Then a notable suppression in crystallinity observed. A total four kinds thickness, from to 6 µm, are investigated correlate modification effect on thickness. Microscopically, continuous shish-kebab structure ...