Titanium (Ti) alloy metal has been used for permanent implant in the human body. Its high strength and hardness take place due to the β phase formation at room temperature. Ti-6%Al-6%V alloy is most popular, of which vanadium (V) content is used as the β phase stabilizer. However V can induce allergic reaction from the body. V can be substituted by other element, such as Mo and Nb. Microstructure observations for Ti-6%Al-6%Mo and Ti-6%Al-6%Nb alloys show that β phase exists as matrix having good workability at room temperature. After preheat at 1000°C, no cracking failure occurs during forging and rolling treatment. Thermal spray method is used for CaPO4 surface treatment. A CaPO4 layer on the alloy substrate forms after the molten CaPO4 is hot sprayed on to the alloy substrate surface. Corrosion test results indicate that the increase in Mo or Nb content up to 6% leads to the increase in corrosion resistance.
MgB2 superconductor is a superconductor with a critical temperature of around 39K and has the potential to replace Nb3Sn and NbTi as superconducting coils to produce high magnetic fields. In this study, monofilament wires have been made to analyze the doping effect of SiC and Carbon Nanotubes (CNT) in its manufacture using Powder-In-Tube (PIT) method. Stainless Steel (SS-316) tube was used as a tube filled with powders of starting materials of Mg, B, SiC and CNT. A total of 8 samples were prepared with variations in the addition of SiC, and CNT as much as 5, 10, and 15 wt %, and also the variations in the addition of Mg composition by 0 and 10 mol % from normal stoichiometric values. The samples were rolled and sintered at 800°C for 3 hours. The samples then were analyzed using SEM (Scanning Electron Microscopy) to analyze the surface morphology, XRD (X-Ray Diffractometer) to analyze the formed phases and crystal structures, and then resistivity versus temperature using cryogenic systems to analyze their superconductivity properties. Based on the results of the XRD analysis, the MgB2 phase is the major phase in the samples and the SiC doping causes the formation of minor phases of Mg2Si and Fe3C. The addition of SiC causes a decrease in crystalline properties of the MgB2 phase due to reaction with SiC, while the addition of CNT does not cause the formation of a new phase. Based on the results of the analysis of resistance versus temperature, it is seen that the addition of SiC causes a decrease in TC value. While the addition of CNT causes the improvement in the nature of superconductivity, but it also causes the decrease of its TC values.
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