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Cards In This Set
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Tribology
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Science of wear
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A surface appears shine because the scratches are smaller than the wavelength of visible light...
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Less than 0.5 microns
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Speed and pressure in polishing is especially important for
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Polymers because of temperature changes use lubrication to help with this
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Larger the contact area
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Faster the rate of abrasion
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Metals like other crystals
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Have repeated long range order in 3-D
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BCCFCCHCP
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Body center cubic - FE, TiFace centered cubic- Ag, Pt, Pd, Cu, Fe Hexagonal close packed- Ti
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Allotropes
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Elements that can exist in more than one tpe of crystal structure diamond - graphite
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The smaller the grain size
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The better the mechanical properties of dental alloys
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Homogeneous nucleation - used in dentistry
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Occurs in single-phase metaluses grain refiners
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High melting alloying elements that are added to single-phase metal
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Grain refiners
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Heterogeneous nucleation - not used in dentistry
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Adds preformed nuclei in the form of a second phase do not melt and are always solid
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Slip
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Metal deformation without breaking by planes of atoms sliding by one an other when shear and plastic strain take place
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Symmetry increases
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The number of slip planes and directions in a system this is what makes dental metals so ductile FCC and HPC configs.
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Interstitials are small solutes in alloys that produces
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Strengthen
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Substitutions are
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Similar to the solvent- solute can substitute in the solvent lattice also, strengthens the alloy
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