材料科學(xué)基礎(chǔ)英文版課件_(8)-全文預(yù)覽
【正文】 osition and environmental conditions (., functional ceramics: microwave dielectric ceramics, ferroelectric and piezoelectric ceramics) 3) Biomaterials Used for ponents implanted into the human body for replacement of the diseased or damaged body parts Advanced materials Materials used in high technology electronic equipment, puters, spacecraft, aircraft, nuclear equipment, etc. Including: ? Traditional materials whose properties are enhanced by some modifications (new processing technology) ? Newly developed materials Chapter Two Atomic bonding in solids ? Introduction ? Primary interatomic bonds ? Secondary bonds ? Condensed states of matter ? Interatomic forces Atomic bonding in solids – Introduction (1) To understand the origin of some material properties, . the modulus of elasticity– need to look at materials on the atomic level Two important things: 1) The force which holds two atoms together (the interatomic bond), working like a little spring The springlike bond between two atoms Atomic bonding in solids – Introduction (2) 2) The ways in which atoms pack together (atom packing) – determining the number of little springs per unit area and the bondangle Atom packing and bondangle The ways in which atoms can be bound together include: Atomic bonding in solids – Introduction (3) (1) Primary bonds ionic, covalent, and metallic bonds strong (2) Secondary bonds Van der Waals and hydrogen bonds weak Primary interatomic bonds (1) ? All ceramics and metals are bound together by primary bonds ? Ionic and covalent bonds in ce
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