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Chapter 15- Ceramic Metals - Chapter 15 Ceramic Metals...

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Picture 1 Picture 2 Chapter 15- Ceramic Metals Thursday, November 04, 2010 9:45 AM 15.1 Applications of Ceramics The use of ceramics is not usually drive by strength or any other structural aspects. Based mainly upon things such as: Optical Transparency- you can adjust the index of refraction Inertness with respect to metals, chemicals, oxygen Magnetic, Electrical, or Thermal Properties Thermal stability Appearance Compressive (not tensile) strength Common engineering ceramics include: Al 2 O 3 , AlN, SiC, Si 3 N 4 , TiO 2 , ZrO 2 (See table 15. 1 for complete listing.) 15.2 Properties of Ceramics There are several tables in the text but the major points are as follows: High T m High Compressive Strength High Modulus Low Fracture toughness Low Tensile strength Very sensitive to surface defects -All ceramics have surface flaws. -If you remove the flaws of a light bulb with acid, you can drop the light bulb and it wouldn't break. 15.3 Synthesis and Processing of Ceramic Powders Ceramics have a very high melting point and are very brittle. So casting and machining are very difficult.
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