Week12Ch13

Week12Ch13 - Chapter 13 Applications and Processing of...

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Chapter 13: Applications and rocessing of Ceramics SUES TO ADDRESS Processing of Ceramics ISSUES TO ADDRESS. .. How do we classify ceramics ? What are some applications of ceramics ? How is processing different than for metals ? Chapter 13 - 1
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13.1- 13.8 Taxonomy of Ceramics Glasses Clay roducts Refractories Abrasives Cements Advanced eramics products ceramics -optical -composite reinforce -whiteware -bricks -bricks for high T (furnaces) -sandpaper -cutting -polishing -composites -structural engine -rotors -valves Properties: -containers/ household pg -bearings -sensors Adapted from Fig. 13.1 and discussion in Section 13.2-6, Callister 7e. -- T m for glass is moderate, but large for other ceramics. -- Small toughness, ductility; large moduli & creep resist. Applications: -- High T , wear resistant, novel uses from charge neutrality. Fabrication -- some glasses can be easily formed Chapter 13 - 2 gy -- some ceramics can not be formed or cast.
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Application: Refractories Need a material to use in high temperature furnaces. Consider the Silica (SiO 2 ) - Alumina (Al 2 O 3 ) system. Phase diagram shows: mullite , alumina , and crystobalite as candidate refractories. T(°C) 2000 2200 mullite Liquid 3Al 2 O 3 -2SiO 2 Adapted from Fig. 12.27, Callister 7e. (Fig. 12.27 is adapted from F.J. Klug and R.H. Doremus, 1800 alumina mullite q ( L ) crystobalite alumina + L , "Alumina Silica Phase Diagram in the Mullite Region", J. American Ceramic Society 70 (10), p. 758, 1987.) 400 1600 + mullite + L mullite + crystobalite + L Chapter 13 - 3 Composition (wt% alumina) 1400 20 40 60 80 100 0
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20wt%Al 2 O 3 -80wt%SiO 2 and 25wt%Al 2 O 3 -75wt%SiO 2 Which is more desirable for refractory? T(°C) 2200 ullite 3Al 2 O 3 -2SiO 2 1800 2000 ullite mullite Liquid ( L ) alumina + L 1600 alumina + mullite mullite + L mullite ystobalite crystobalite + L Composition (wt% alumina) 1400 20 40 60 80 100 0 + crystobalite Chapter 13 - 4
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Application: Cutting Tools Tools: -- for grinding glass, tungsten, carbide, ceramics -- for cutting Si wafers -- for oil drilling blades oil drill bits Solutions: -- anufactured single crystal coated single crystal diamonds manufactured single crystal or polycrystalline diamonds in a metal or resin matrix. -- optional coatings (e.g., Ti to help polycrystalline diamonds in a resin matrix. pg ( g , p diamonds bond to a Co matrix via alloying) -- polycrystalline diamonds Chapter 13 - 5 resharpen by microfracturing along crystalline planes.
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Application: Sensors Example: Oxygen sensor ZrO 2 Principle: Make diffusion of ions Ca 2+ fast for rapid response.
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This note was uploaded on 09/21/2010 for the course EGN 3365 taught by Professor Jiuhuachen during the Spring '09 term at FIU.

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Week12Ch13 - Chapter 13 Applications and Processing of...

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