Chp. 19-20: Ceramics: Do They Have To Be Brittle

Question 1

catastrophic failure

Answer 1

when glass shatters suddenly into many pieces

Question 2

stress concentrators

Answer 2

surface cracks and scratches

Question 3

Fiber

Answer 3

finer the fiber, stronger the fiber

Question 4

flame polishing

Answer 4

removing or at least reducing the cracks on the surface of glasses with flames

Question 5

ion-implantation

Answer 5

when large atoms (ions) are fired into imperfect glass where they force any surface cracks and scratches to close

Question 6

Reducing grain size

Answer 6

smaller the crystal, the smaller the surface cracks and the stronger the ceramic

Question 7

nano phase ceramics

Answer 7

deform by grains sliding over one another, imparting ductile rather than brittle character

Question 8

nucleate

Answer 8

getting the crystals to form

Question 9

seeding

Answer 9

when a nucleating agent (like titanium dioxide in glass) has molecules that grow

Question 10

devitrification

Answer 10

removing the glassy state of a material

Question 11

thermal shock resistance

Answer 11

high strength and low thermal expansion, doesn’t break when drastically changed temperatures.

Question 12

thermal tempering

Answer 12

sheet of glass is heated and soft then blasted quickly with cold air, leaving the center soft still and contracting, safety glass