材料科學(xué)基礎(chǔ)英文版課件_(8)-文庫吧
2025-01-03 18:57 本頁面
【正文】 isting materials and develop new materials, we need to know MSE Classification of materials In terms of chemical makeup and atomic structure Metals。 Ceramics。 Polymers 1) Metallic: binations of metallic elements Free electrons – good electrical and thermal conductivities Strong but deformable – extensive use in structural applications 2) Ceramic: pounds between metallic and nonmetallic elements – oxides, nitrides, and carbides Very insulative to electricity and heat – very low electrical and thermal conductivities Highly resistant to high temperatures and corrosive environments Very hard but very brittle 3) Polymeric: anic pounds based on carbon, hydrogen and other nonmetallic elements – plastics and rubbers Normally low density and relatively flexible Additional types of material Composites。 Semiconductors。 and Biomaterials They originate from the three basics (metals, ceramics and polymers), but they have special uses and functions 1) Composites Composed of more than one material type – one: matrix。 other(s): reinforcing addition Matrix – polymeric, metallic, or ceramic materials Reinforcing addition: glass fibers, carbon fibers, ceramic fibers (. basalt fibers) or nanoparticles (. SiC, SiN, etc) Designed to display a bination of the best properties of each of the ponents 2) Semiconductors Electrical properties being intermediate between conductors and insulators and being very sensitive to their position and environmental conditions (., functional ceramics: microwave dielectric
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