ceramics - MEGR 2180 eramics Ceramics MEGR 2180 Engineering...

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Unformatted text preview: MEGR 2180 eramics Ceramics MEGR 2180 Engineering Materials etals lastics eramics omposites Metals Plastics Ceramics Composites Nonferrous Ferrous Oxides Nitrides Carbides Reinforced plastic Metal-matrix eramic atrix Steels Stainless steels Tool and die steels Aluminum Copper Titanium Tungsten Glasses Graphite Diamond Ceramic-matrix Laminates Thermoplastics Thermosets Cast Irons g Elastomers Acrylics ABS Nylons Polyethylene PVC Epoxies Phenolics Polymides Rubbers Silicones Polyurethanes MEGR 2180 eramics Ceramics “ eramos” meaning • Keramos meaning clay • wo major categories Two major categories – Aesthetic uses (pottery, ornamental objects) – Industrial uses • Properties – Microcrystalline – Covalent bonds MEGR 2180 ERAMIC TYPES CERAMIC TYPES • Oxide ceramics – Alumina – aluminum oxide Al 2 O 3 • arbides Alumina parts Carbide inserts Carbides – Tungsten carbide – Silicon carbide Tungsten carbide spheres • Nitrides – Cubic boron nitride (CBN) – Titanium nitride lass • Glass • Graphite/Diamond CBN Inserts Nitride parts MEGR 2180 ECHANICAL PROPERTIES MECHANICAL PROPERTIES CERAMICS • Brittle • Hardness and strength t elevated temperatures too – At elevated temperatures too • High modulus • Low toughness • Low – Thermal expansion hermal conductivity Thermal conductivity – Electrical conductivity MEGR 2180 PHYSICAL PROPERTIES • Relatively low density • hermal fatigue • Dielectric strength-the maximum electric field trength that it can Thermal fatigue – Thermal cracking – Low diffusivity strength that it can withstand intrinsically without breaking down, e itho t • Anisotropy i.e. , without experiencing failure of its insulating properties • Magnetic • iezoelectric Piezoelectric MEGR 2180 MEGR 2180 ngineering Ceramics Engineering Ceramics • Ceramics as Engineering Materials – Concrete – Brick – Glasses orcelanic insulators (ex spark plugs) – Porcelanic insulators (ex spark plugs) – Piezoelectric • Manufacturing Engineering uses inings in furnaces – Linings in furnaces – Primary manufacture of metals – Sands in castings utting tool materials Cutting tool materials – Seal components MEGR 2180 GLASS • Amorphous • Formed from fused Silica (SiO 2 ) sand in an arc rnace and cooled rapidly furnace and cooled rapidly • Has no distinct melting or freezing point – Working point • Types of Glass – Soda-lime – Lead-alkali – Borosilicate (Pyrex) – Silica • roperties Borosilicate Vials Properties – Low strength except as fibers – Low thermal conductivity igh resistively and dielectric optical properties High resistively and dielectric optical properties MEGR 2180 ypes of Glass Types of Glass • Soda lime • Borsilicate (Pyrex) • Fused Silica...
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This note was uploaded on 10/01/2009 for the course MEGR 2144 taught by Professor Sharpe during the Fall '08 term at UNC Charlotte.

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ceramics - MEGR 2180 eramics Ceramics MEGR 2180 Engineering...

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