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Derryl Poynor Rick Steffe David Cunningham

Ti-6Al-7Nb Hip Prosthesis (Femoral Hip Stem). Derryl Poynor Rick Steffe David Cunningham. Composition. Impurities Ta : < 0.5% Fe: < 0.25% N2: < 0.05% O2: < 0.2% C: < 0.08% H2: < 0.009%. Chemical Properties. Superior Atmospheric Corrosion Allotropic Highly Reactive Metal Surface

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Derryl Poynor Rick Steffe David Cunningham

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  1. Ti-6Al-7Nb Hip Prosthesis (Femoral Hip Stem) Derryl Poynor Rick Steffe David Cunningham

  2. Composition • Impurities • Ta: < 0.5% • Fe: < 0.25% • N2: < 0.05% • O2: < 0.2% • C: < 0.08% • H2: < 0.009%

  3. Chemical Properties • Superior Atmospheric Corrosion • Allotropic • Highly Reactive Metal Surface • BIOCOMPATIBLE! • Cells accept alloy • High protein absorption • Inert coating

  4. http://ars.els-cdn.com/content/image/1-s2.0-S0169409X10000402-gr2.jpghttp://ars.els-cdn.com/content/image/1-s2.0-S0169409X10000402-gr2.jpg

  5. Stress/Strain • Tensile strength is 145ksi • Hardness values • Rockwell A – 66.5 • Rockwell C – 32 • High compressive strength is 156-158 ksi • Elongation is 9.4 – 13.2% • Fracture toughness is 61.9 – 68.3 ksi. in1/2 • Fatigue Strength is 72500 psi • Yield Strength is 114 – 130 ksi

  6. Physical Properties • Ductile • Low density • Low friction

  7. Manufacturing: Forging • Heat treat • Annealed • 700ºC for 1 hour • Air cooled • Isothermal Forging • Cut ingot • Heat ingot to 900ºC • Fed into a hydraulic press

  8. Manufacturing: Hot Press • Hot-pressing in molds • Loose powder placed into mold • Heat and pressure are applied • Occurs in a vacuum • Chemical/Heat Treat • Product is grit blasted • Passivation in nitric acid • Placed in an alkaline solution • Heat treated • In air or vacuum • At 600ºC

  9. Other Information • Laser forming • Over 200 tons of semi-finished bars created • Other applications • Orthopedics • Dentistry • Slinkys • Airplane engines (I.E. fan blades)

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