mse13 - Chapter 13: Applications and Processing of Ceramics...

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1 Chapter 13 - 1 ISSUES TO ADDRESS. .. • How do we classify ceramics? • What are some applications of ceramics? • How is processing different than for metals? Chapter 13: Applications and Processing of Ceramics Chapter 13 - 2 • Properties: -- Tm for glass is moderate, but large for other ceramics. • Applications: -- High T , wear resistant, novel uses from charge neutrality. • Fabrication -- some glasses can be easily formed -- other ceramics can not be formed or cast. Glasses Clay products Refractories Abrasives Cements Advanced ceramics -optical -composite reinforce -containers/ household -whiteware -bricks -bricks for high T (furnaces) -sandpaper -cutting -polishing -composites -structural engine -rotors -valves -bearings -sensors Adapted from Fig. 13.1 and discussion in Section 13.2-6, Callister 7e. Taxonomy of Ceramics
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2 Chapter 13 - 3 • 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. Adapted from Fig. 12.27, Callister 7e. (Fig. 12.27 is adapted from F.J. Klug and R.H. Doremus, "Alumina Silica Phase Diagram in the Mullite Region", J. American Ceramic Society 70 (10), p. 758, 1987.) Application: Refractories Composition (wt% alumina) T( ° C) 1400 1600 1800 2000 2200 20 40 60 80 100 0 alumina + mullite mullite + L mullite Liquid ( L ) mullite + crystobalite crystobalite + L alumina + L 3Al 2 O 3 -2SiO 2 Chapter 13 - 4 tensile force A o A d die die • Die blanks: -- Need wear resistant properties! • Die surface: -- 4 μ m polycrystalline diamond particles that are sintered onto a cemented tungsten carbide substrate. -- polycrystalline diamond helps control fracture and gives uniform hardness in all directions. Courtesy Martin Deakins, GE Superabrasives, Worthington, OH. Used with permission. Adapted from Fig. 11.8 (d), Callister 7e . Courtesy Martin Deakins, GE Superabrasives, Worthington, OH. Used with permission. Application: Die Blanks
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3 Chapter 13 - 5 • Tools: -- for grinding glass, tungsten, carbide, ceramics -- for cutting Si wafers -- for oil drilling blades oil drill bits • Solutions: coated single crystal diamonds polycrystalline diamonds in a resin matrix. Photos courtesy Martin Deakins, GE Superabrasives, Worthington, OH. Used with permission. Application: Cutting Tools -- manufactured single crystal or polycrystalline diamonds in a metal or resin matrix. -- optional coatings (e.g., Ti to help diamonds bond to a Co matrix via alloying) -- polycrystalline diamonds resharpen by microfracturing along crystalline planes. Chapter 13 - 6
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mse13 - Chapter 13: Applications and Processing of Ceramics...

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