English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Titanium films, of 5 µm in thickness were deposited uniformly on three-dimensional structures of scaffold carbon foam substrates using a hybrid electron cyclotron resonance-direct current (ECR-DC) sputtering system. A cylindrical hollow cathode with internal diameter of 80 mm and external diameter of 90 mm and length of 60 mm, negatively biased, was used as titanium atoms supplier. The DC sputtering voltage applied to the target controlled the feeding with excited titanium atoms. The Vickers micro-hardness of the films was found to be in the range of 250-300 HV. The film surfaces were smooth and showing pure titanium, preferentially grown on the Ti (100) crystallographic phase. Flexural strength and elastic modulus of the carbon foam were improved by a factor of 1.5 and 2.6 respectively. In recent years, scaffold carbon foams are widely used for tissue engineering. Carbon foam consists of a honeycomb three-dimensional structure, obtained mainly by pyrolyzing a polymer at high temperature in an inert gas atmosphere. The number of pores per mm varying from 0.2 to 4 characterizes the carbon foams. These cellular materials are thermally sta- ble, low in weight and density, chemically pure, resistant to thermal stress and shock, and are relatively inexpensive. Materials for tissue engineering should be biocompati- ble and corrosion resistant. 1) These materials should also have appropriate mechanical properties. 2) A current method for increasing mechanical properties and biocompatibility of the scaffold carbon foam is the chemical vapor deposition (CVD). 2) During CVD, a continuous thin film of metals such as rhenium, tantalum, titanium or compounds such as sili- con carbide can be distributed throughout the interior of a 3-dimensional structure. The films confer certain thermal or tensile properties to a carbon foam substrate and to the struc- ture as a whole. Low cost, low density, high chemical purity, controlled thermal expansion and high thermal stability char- acterize the resulting product. In the present study we aim to develop a method for uni- form coating-isotropic deposition with titanium (known as a biocompatible material 3, 4) ) outside and inside the foam struc- ture by using a hybrid ECR-DC sputtering system. The low working pressure (10 −2 -10 −1 Pa) affects the properties of the film surface in terms of cleanliness and adhesion. Titanium and TiN films can be prepared with high deposition rate also by magnetron sputtering 5) or electron beam sustained Ti arc plating, 6) but in these methods a strong directional mode of deposition-anisotropic deposition-occur. The effects of the sputtering potential on the excited Ti atom intensities, the film composition and the mechanical properties as flexural strengths and elastic modulus of the coated scaffold carbon foam have been investigated.

Titanium Coating of Scaffold Carbon Foam by ECR Sputtering