Ch. 12 Structure & Properties of Ceramics

Question 1

Ceramic Groups

Answer 1

Glasses, Clay, Refractories, Abrasive, Cements, Advanced Ceramics, Carbon

Question 2

Crystal Structures

Answer 2

AX, AX2, AmBnXp

Question 3

SiO2 in amourphous form

Answer 3

Glass

Question 4

SiO2 in crystalline form

Answer 4

Quartz

Question 5

Carbon structures

Answer 5

Diamond, Graphite, C60(bucky balls), SWCNT, MWCNT

Question 6

Point defects in ceramics

Answer 6

Vacancies, Interstitials, Frenkel Defect, Shottky defect, Impurities

Question 7

Glass subgroups

Answer 7

Glasses, Glass ceramics

Question 8

Clay subgroups

Answer 8

Structural, whitewares

Question 9

Refreactors subgroups

Answer 9

Fireclay, silica, basic, special

Question 10

Diamond properties

Answer 10

Low electrical cond., high temp thermal cond, hard

Question 11

Graphite properties `

Answer 11

High interplanar electrical cond., chemical stability, graphene layers

Question 12

Impurities must obey..

Answer 12

Electronegativity

Question 13

Mechanical properties of ceramics

Answer 13

brittle, low tensile strength, high compressive strength, high hardness, low fract. toughness

Question 14

Fracture Toughness formula

Answer 14

= Y(constant) * Stress * Sqrt(pi * a)

Question 15

Stress - Strain Behaviour

Answer 15

Flexure test are used

Question 16

Elastic behaviour is usually..

Answer 16

linear

Question 17

E formula for beam bend test

Answer 17

E = (F / height diff.) * ( L^3 / 4 * B * D^3)

Question 18

E formula for tube bend test

Answer 18

E = (F / height diff) * ( L^3 / 12 * pi * R^4)

Question 19

E formula for porosity

Answer 19

E = E0 (E of fully dense mat.) * (1-1.9P (volume fraction of porosity) + 0.9P^2)

Question 20

Flexural Strength to porosity formula

Answer 20

Flexural strength = σ0(const.) exp(-n(const.) P)

Question 21

Frenkel Defect

Answer 21

cation moves place (2 cations in one, one missing)

Question 22

Schottky Defect

Answer 22

Cation & Anion missing