Abstract
Bio-glass is often combined with titanium to off-set the inherent brittlensess of bio-glass. However, due to the diffusion of oxygen from the titanium surface, titanium will also become brittle when bio-gass is baked to its surface. To prevent this phenomenon, we plasma-spray coated the titanium surface with either Mo or Al, or a mixture of the two. Both of these metals have a higher affinity for oxygen than titanium. We then investigated the effects of the metal coating on oxygen diffusion into the titanium. We also measured the effects of the diffusion of the metals or oxygen into the titanium on the hardness, bending strength, and yield strength of titanium. Titaniumu became brittle when heated. This was most evident at 1000℃. When the titanium was spray coated with Al, oxygen diffusion into the titanium was prevented at 900℃. The Al coated layer became porous when heated. When the titanium was spray-coated with a Mo-Al mixture, the titanium became brittle when heated. The higher the rate of Al in the mixture, the more brittle the titanium became when heated. The Mo spray-coated layer actually improved the toughness and other qualities of the heated titanium. Titanium to diffused into tho metal-coated layers.
