ENGR 50M Chapter Notes - Chapter 1: Atomic Mass, Electronegativity, Unified Atomic Mass Unit
3 Jan 2017
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Document Summary
Materials science: concerned with understanding internal structure, properties and processing of materials. Materials engineering: concerned with using materials in products to benefit societal needs. 5 main classes of engineering materials: metallic, ceramic, polymeric, composite electronic. Contain one or more metallic elements, all inorganic. Good conductors of heat and electricity, and high resistivity. Common ones include aluminum oxide, clay, glass. Inorganic materials always one metallic and a nonmetallic element bonded together. Consist of organic long molecule chains and networks (covalent bonds) Low densities and low softening temperatures: composite. Not a bond, but rather a mixture of different materials. Consist of selected filler or reinforcing material, and a compatible resin binder. Subtypes: fibrous and particulate (particles in matrix) Examples: fiberglass in polyester or epoxy matrix, carbon fibers in epoxy matrix. Atomic mass: mass in grams of 1 mol or 6. 023 * 10 ^ 23 atoms of a specific element. 1 amu: one twelfth of the mass of carbon atom.
