โ Scribed by R. Singh; J.S. Khamba
No coin nor oath required. For personal study only.
This paper initially reviews machining of titanium and its alloys with three different slurries (namely silicon carbide, boron carbide and alumina) and details background work on machinability of the same in ultrasonic drilling. Experimental research has been subsequently presented on the production of 5 mm diameter holes in pure titanium (TITAN15, ASTM Gr2) and titanium alloy (TITAN31, ASTM Gr.5) using ultrasonic drilling. This entailed the use of a 20 kHz piezoelectric transducer with three solid tools of stainless steel, titanium and high-speed steel, operating in silicon carbide, boron carbide and alumina slurry. The data presented includes main effect plots for material removal rate and tool wear rate. The results suggested that boron carbide slurry and stainless steel tool was giving best material removal rate. Also relative hardness of tool-work piece affects the material removal rate in ultrasonic machining.
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This study was undertaken to evaluate the effect of coating characteristics on the mechanical strengths of the plasma-sprayed HA-coated Ti-6Al-4V implant system both in vitro and in vivo. Two types of HA coatings (HACs) with quite different microstructures, concentrations of impurityphases, and indi