材料科學(xué)與工程基礎(chǔ)1-全文預(yù)覽
【正文】 Application of the tetrahedron of materials science and engineering to semiconducting polymers for microelectronics. [r?u′b?st] 結(jié)實(shí)的；耐用的；堅(jiān)固的 Synthesis and processing ? How can pure, homogeneous, and fine powders of welldefined stoichiometry be made? ? How do we make long lengths of wires? Figure Application of the tetrahedron of materials science and engineering to ceramic superconductors. Note that the microstructuresynthesis and processingposition are all interconnected and affect the performancetocost ratio ? What is the current carrying capacity? ? What is the cast of cooling and fabrication? Microstructure ? What features of the structure limit the current carrying capacity? ? What is the texture of the material? Composition ? YBa2Cu3O7x ? YBa2Ca3Cu4O11 ? YSr2Ca2Cu3O10 Performance Cast Tetrahedron of MSE 2. Materials Science ? The emphasis is on the underlying relationships between the synthesis and processing, structure, and properties of materials. 3. Materials Engineering ? The focus is on how to translate or transform materials into a useful device or structure. Compos ition Synthesi s and proces sing Micros tructure performa nce/c ostApplication OF Tetrahedron : a sample product –ceramic superconductors invented in 1986 (1)DISCOVERY (2)LIMITATION (3)IMPROVEMENT (4)SOLUTION (5)BRITTLE (6)SOLUTION 12 Classification Of Materials ? According to different properties ? Functional Classification of Materials ? Classification of Materials Based on Structure (microstructure) Classification Properties Application Metals good electrical and thermal conductivity automobile engine (steels, aluminum, relatively high strength, stiffness, aircraft, electrical magnesium) ductivity, formability conductor wire Ceramics high melting point, strength, hardness house puter chip (Si , SiO2 ,Al2O3 , capacitors, electrical insulation ,MgO ,
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