1) (25 points) Despite their excellent mechanical properties ceramics do not accept plastic de to any sizable extent. Explain the reasons for this and contrat the plastic deformation in of ceramics with that of metals. Why ceramics are much more brittle than metals?
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- Metals have metallic bonds, which are non-directional and involve a "sea of electrons" that allows atoms to slide past each other more easily. Show more…
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1. Which of the following statement about ceramics is Correct? (a) generally denser than metals (b) compressive strength is higher than tensile strength (c) Weibull modulus is around 30 (d) excellent thermal shock resistance 2. Which of the following is considered ceramics? (a) Diamond (b) Silica (c) Alumina (d) Ice (e) all of above 3. Alumina can be used as a refractory. A refractory is a material that (a) has a large temperature range as a liquid (b) acts as a catalyst (c) easily sublimes (d) keeps its strength at high temperature (e) has excellent toughness at high temperature 4. Ceramics are generally brittle and hard because (a) there is no dislocation (b) the microstructure is always amorphous (c) bonds in ceramics have high resistance against dislocation motion (d) bonds are easy to break (e) free electrons create strong attractive force among atoms 5. Why does glass processing need glass modifiers? (a) completely devitrify the microstructure (b) reduce the melting point and viscosity (c) serve as catalyst to speed up solidification (d) present devitrification of the glass (e) densify the glass 6. Which of the following glasses is commonly used for car door windows? (a) annealed (b) tempered (c) laminated (d) as-made (not heat treatment) (e) crystallized 7. Derive the apparent porosity of ceramics.
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