Ceramics Flashcards
1
Q
What type of bonds are most common in ceramics?
A
Ionic or Covalent.
2
Q
What properties do ceramics have?
A
High hardness and youngs modulus.
Brittle.
3
Q
Do ceramics have high or low melting points?
A
High.
4
Q
Do ceramics have high or low electrical conductivity?
A
Low.
5
Q
What type of material do amorphous ceramics usually form?
A
Glass.
6
Q
Defects in ceramics.
A
Point defects (Vacancies)
Dislocations
Pores left by processes
Grain boundaries (In Crystaline ceramics)
7
Q
What is thermal shock failure?
A
Rapid temperature change or uneven temperature change (exterior expanding, interior shrinking)
8
Q
Describe two heat treatment methods used for glass materials?
A
Annealing - heating to annealing point allows stresses to be relieved.
Thermal tempering - toughens the glass.
