MIT16_982s09_lec07

MIT16_982s09_lec07 - MIT OpenCourseWare http:/ocw.mit.edu...

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MIT OpenCourseWare http://ocw.mit.edu 16.982 Bio-Inspired Structures Spring 2009 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms .
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Ceramics and Glasses eramic: Ceramic: Inorganic compounds that contain metallic Inorganic compounds that contain metallic and non-metallic elements, for which inter-atomic bonding is ionic or covalent, and which are generally formed at high temperatures. Glass : (i) An inorganic product of fusion that has cooled to a rigid condition without crystallization; i) An amorphous solid (ii) An amorphous solid. 4/19/2009
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morphous Amorphous (i) Lacking detectable crystallinity; (ii) : (i) Lacking detectable crystallinity; (ii) possessing only short-range atomic order; also glassy or vitreous Glass-ceramic : Polycrystalline solids prepared by the controlled crystallization (devitrification) of glasses. Bioactive material : A material that elicits a specific iological response at the interface of the biological response at the interface of the material, resulting in the formation of a bond between the tissues and the material. 4/19/2009
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rystalline ceramics have Crystalline ceramics have ng long- nge order range order, with with components composed of many individually oriented grains. Glassy materials possess short-range order, and generally do not form individual grains. The distinction is made based on x-ray diffraction characteristics. Most of the structural ceramics are crystalline. 4/19/2009
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Property Units Ti6A1 4V 316 SS CoCr Alloy TZP Alumina Young's modulus GPa 110 200 230 210 380 Strength MPa 800 650 700 900-1200 >500 Hardness HV 100 190 300 1200 2200 Figure by MIT OpenCourseWare. • Stiffness is comparable to the metal alloys • The biggest problem is fracture toughness (sensitivity flaws) to flaws). • Rigid plastics < Ceramics = Metals 4/19/2009
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ert in body (or bioactive in body); Chemically inert inert in body (or bioactive in body); Chemically inert in many environments igh wear resistance (orthopedic & dental applications) high modulus (stiffness) & compressive strength esthetic for dental applications 4/19/2009
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rittle (low fracture resistance brittle (low fracture resistance, flaw tolerance) flaw tolerance) low tensile strength (fibers are exception) oor fatigue resistance (relates to flaw tolerance) poor fatigue resistance (relates to flaw tolerance) 4/19/2009
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rthopedics: Orthopedics: bone plates and screws
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This note was uploaded on 11/08/2011 for the course AERO 16.851 taught by Professor Ldavidmiller during the Fall '03 term at MIT.

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MIT16_982s09_lec07 - MIT OpenCourseWare http:/ocw.mit.edu...

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