Question

The creep strength for ceramic materials is generally:

Group of answer choices

Higher than metals at lower T

Higher than metals at higher T

Can’t be measured for ceramics

Lower than metals at higher T

What impact would substituting Ca²⁺ ions for zirconium ions (i.e. adding an impurity of calcium in the form of CaO) in a ZrO₂ ceramic have on the material in terms of defects?

Group of answer choices

For each Ca²⁺ substitution, one Schottky defect would form for Zr and O

For each Ca²⁺ substitution, one O^2- vacancy would form

For each Ca²⁺ substitution, one Frenkel defect would form for oxygen

For each Ca²⁺ substitutions, one O^2-interstitial would form

Increasing the strain rate during deformation of polymers, increases:

Group of answer choices

Toughness

Strength and stiffness

Ductility

Crystallinity

Which of the following is not a type of defect in polymer structures?

Group of answer choices

Impurity

Dislocations

Loose chain

Dangling chain

Interstitial

Vacancy

Crystallinity increases with all of the following, except:

Group of answer choices

Cross linking

Annealing

Conformation

Stretching

Answer 1

1.Option A Higher than metals at higher T

Creep strength for ceramic materials is generally higher than metals at higher Temperature.

2.Option B For each Ca2+ substitution, one O2- vacancy would form

Each Ca2+ when added to zirconium ions would produce Oxygen vacancy

3.Option B Strength and stiffness

Increasing the strain rate during deformation of polymers, increases yield Strength and stiffness

4.Option E Interstitial

Except interstitial,all are type of point defects in polymer structure.

5. Option A Cross Linking

Crystallinity decreases with increase in Cross Linking