MSE 2034 Lecture Notes - Lecture 1: Magnetic Storage, Aluminium Oxide, Transmittance
22 Feb 2017
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Processing can change structure: ex. structure vs cooling rate of steel. Metals: string, ductile, high thermal & electrical conductivity, opaque, reflective. Ceramics ionic bonding (refractory) compounds of metallic & non-metallic elements (oxides, carbides, nitrides, sulfides) Polymers (synthetic organic materials: covalent bonds - sharing of electrons. Composite structures - mix of above materials. In order of highest density to lowest (average: metals, ceramics, polymers, composites. Pick application --> determine required properties: properties: mechanical, electrical, thermal, magnetic, optical, deteriorative. Properties --> identify candidate material(s: material: structure, composition. Material --> identify requires processing: processing: changes structure and overall shape. Ex. casting, sintering, vapor deposition, doping forming, joining, annealing. Electrical resistivity of copper: adding impurity atoms to cu increasing resistivity, deforming cu increases resistivity. Magnetic storage: recording medium is magnetized by recording head. Composition: adding 3 atomic % si makes fe a better recording medium. Transmittance: aluminum oxide may be transparent, translucent or opaque depending on the material structure.
