Homogeneous corrosion of high pressure torsion treated Mg–Zn–Ca alloy in simulated body fluid

2011 ◽  
Vol 65 (4) ◽  
pp. 691-693 ◽  
Author(s):  
J.H. Gao ◽  
S.K. Guan ◽  
Z.W. Ren ◽  
Y.F. Sun ◽  
S.J. Zhu ◽  
...  
Keyword(s):  
High Pressure ◽  
Simulated Body Fluid ◽  
Body Fluid ◽  
High Pressure Torsion

In Vitro Degradation of Ultrafine Grained Mg-Zn-Ca Alloy by High-Pressure Torsion in Simulated Body Fluid

2012 ◽  
Vol 706-709 ◽  
pp. 504-509 ◽  
Author(s):  
Shao Kang Guan ◽  
Zhen Wei Ren ◽  
Jun Heng Gao ◽  
Yu Feng Sun ◽  
Shi Jie Zhu ◽  
...  
Keyword(s):  
High Pressure ◽  
Simulated Body Fluid ◽  
Body Fluid ◽  
High Pressure Torsion ◽  
Cast Alloy ◽  
Mg Alloy ◽  
Second Phase ◽  
Ultrafine Grained ◽  
Degradation Properties

In this paper the in vitro degradation of ultrafine grained (UFG) Mg-Zn-Ca alloy produced by HPT was investigated by electrochemical measurements and immersion tests in SBF. It was found that UFG Mg alloy had better degradation properties and also higher microhardness value than as-cast Mg alloy. The corrosion current density of UFG Mg alloy decreased by about two orders of magnitude, compared with that of as-cast alloy. Through electrochemical impedance spectroscopy (EIS) test，UFG Mg alloy showed a higher charge transfer resistance value. In immersion test, UFG Mg alloy in SBF exhibited more uniform corrosion and lower degradation rate (0.0763 mm/yr) than as-cast alloy. The degradation properties were related with the microstructure evolution, namely the grain refinement and redistribution of second phase. Keywords: Mg-Zn-Ca alloy; High-pressure torsion (HPT); Degradation behavior; Simulated body fluid (SBF); Microhardness

Calcium Titanate Film-Coating on Titanium with Hydrothermal Treatments

2007 ◽  
Vol 330-332 ◽  
pp. 737-740 ◽  
Author(s):  
Masayuki Kon ◽  
Razia Sultana ◽  
Emi Fujihara ◽  
Kenzo Asaoka ◽  
Tetsuo Ichikawa
Keyword(s):  
High Pressure ◽  
Surface Modification ◽  
Simulated Body Fluid ◽  
Body Fluid ◽  
Titanium Surface ◽  
Film Coating ◽  
Calcium Titanate ◽  
Maximal Pressure ◽  
Titanium Surfaces ◽  
Modification Of Titanium

Film-coating on the surface of titanium was investigated by hydrothermal treatments with a maximal pressure of 6.3 MPa (280°C) in CaO solution and water to improve bioactivity and biocompatibility. As a result, calcium titanate (CaTiO3) film was formed on the titanium surface. The surface-coated titanium was immersed in a simulated body fluid (SBF) to estimate its bioactivity. Apatite precipitation was observed on all hydrothermal-treated titanium surfaces after immersion in SBF for 4 weeks. In particular, the apatite precipitation of titanium treated with 6.3 MPa in CaO solution was clearer and larger in amount than those of all other hydrothermal-treated specimens. The results suggest that surface modification of titanium with high-pressure hydrothermal treatments can be expected to improve bioactivity and biocompatibility.

Intermixing of Fe and Cu on the Atomic Scale by High-Pressure Torsion as Revealed by Dc- and Ac-Squid Susceptometry

2020 ◽  
Author(s):  
Martin Stückler ◽  
Heinz Krenn ◽  
Lukas Weissitsch ◽  
Stefan Wurster ◽  
Reinhard Pippan ◽  
...  
Keyword(s):  
High Pressure ◽  
High Pressure Torsion ◽  
Atomic Scale

IN-VITRO BEHAVIOUR OF BIPHASIC CALCIUM PHOSPHATE WITH DIFFERENT RATIO OF SILICA CONTENT IN SIMULATED BODY FLUID

2015 ◽  
Vol 23 (1) ◽  
pp. 1-14
Author(s):  
Sudirman Sahid ◽  
◽  
Nor Shahida Kader Bashah ◽  
Salina Sabudin ◽  
◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
Simulated Body Fluid ◽  
Body Fluid ◽  
Biphasic Calcium Phosphate ◽  
Silica Content
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