Chapter 76 P2

Question 1

What is a cermaci

Answer 1

Inorganic coumpound consisting of metal (maybe semimetals) and one more more nonmetals

Question 2

what are four most common elements in the earth’s crust

Answer 2

oxygen, silicon, aluminium and iron

Question 3

what is the difference between traditional and new cermacis

Answer 3

tradiotionas are based in clayy products while new ceramics are simpler in chemical composition

Question 4

what is the feature that distingueshes glass form traditional and new ceramics

Answer 4

it is amporphus, while most other cramics have a crystaline structurew

Question 5

hat are the general mechanical properties of ceramic materials

Answer 5

hihg hardness, britlensess and no ductility

Question 6

what are the general physical properties of ceramic materials

Answer 6

electrical and thermal insulating, medium density, high melting temp, and thermal expansion is less than metals

Question 7

What type of atomic bonding characterizes tehc eramics

Answer 7

covalent and ionic

Question 8

What do bauxite and corundum have in common

Answer 8

both minerals of alumina

Question 9

What is clay, used in making ceramic products

Answer 9

Clay most commonly consists of hydrous aliuminum silicate, for example kaolinite is a common clay

Question 10

What is glazieng

Answer 10

INvolves teh apllication of a surface coating of oxides such as alumina and silica, usually to a porus ceramic product such as earthware to make the product more impervious to moisture and more shiny

Question 11

What does the term refractory mean

Answer 11

refractories are heat resistant ceramic materials. Also applied to metals that are heat ressitant

Question 12

What are some of the principal applications of cement carvide

Answer 12

Include cutting tool inserts, drawind dies, rck drilling bits, dies for powder metallurgy and other applications where hardness is a crit. factor.

Question 13

What are some of the important applications of titanium nitride

Answer 13

thin coating on cutting tools to prolong tool life

Question 14

What are eements in the cermaic material Sialon

Answer 14

Sialon consists of the elements silicon,a luminum, oxygen and nitrogen

Question 15

define glass

Answer 15

inroganic, nonmetalic material that cools to a rigid solid without crystalisation

Question 16

what is the primary mineral in glass products

Answer 16

silica or silicon dioxide

Question 17

what are some of the funcitons of the ingredients that are added to glass in addition to silica name at least three

Answer 17

acting as fux during heating, increasing fluidity, retarding the tendency to crystallize, reducing thermal expansion, increasing chemical resistance, adding color to glass, altering the index of reaction for optical aplication

Question 18

devirtrification?

Answer 18

the transfomation form the glassy state into polycrystalline state

Question 19

what is graphite

Answer 19

carbon in the form ohexagonal ctystaline layers which covalent bonding exist in layers while the parallel layers are bonded by van der walls forces. highly anisotropic (strength on one side) properties

Question 20

which of the following is the most commonelement in the earths crust (a) aluminum, (b)
calcium, (c) iron, (d) oxygen, or (e) silicon?

Answer 20

d ocygen

Question 21

Glass products are bsed on which of the following minerals (a) alumina, (b)
corundum, (c) feldspar, (d) kaolinite, or (e) silica?

Answer 21

e silica

Question 22

Which of the following contains significant amounts of aluminium oxide (a)
alumina, (b) bauxite, (c) corundum, (d) feldspar, (e) kaolinite, (f) quartz, (g) sandstone, and (h) silica?

Answer 22

a alumina, b bauxite, c corundum

Question 23

Which of the follwoing ceramics are commonly used as abrasives in grinding wheels (a) aluminum oxide, (b) calcium oxide, (c) carbon monoxide, (d) silicon carbide, and (e)
silicon dioxide?

Answer 23

a aluminium oxide, ,d silicon carbide

Question 24

which of the follwoing is generally the most porus of the clay-based pottery ware (a) china, (b)
earthenware, (c) porcelain, or (d) stoneware?

Answer 24

b earthenware

Question 25

Which fot he following is fired at the highest temp. (a) china, (b) earthenware, (c)
porcelain, or (d) stoneware?

Answer 25

c porcelain

Question 26

Whcih of the following comes closest to expressing the chemical composition of clay (a) Al2O3,
(b) Al2(Si2O5)(OH)4, (c) 3AL2O3-2SiO2, (d) MgO, or (e) SiO2?

Answer 26

b (wtf is that)

Question 27

Glass ceramics are plyctystaline ceramic structures that have been transformed into the glassy state tru false

Answer 27

false. Glass ceramics are glasses that have been transformed into mostly crystalline form through heat tretement

Question 28

which one fo the following materials is closest to diamond in hardness (a) aluminum oxide, (b)
carbon dioxide, (c) cubic boron nitride, (d) silicon dioxide, or (e) tungsten carbide?

Answer 28

c cubic boron nitride

Question 29

which of the following vest characterizes the structure of glass-ceramcis ) 95% polycrystalline, (b)
95% vitreous, or (b) 50% polycrystalline?

Answer 29

a 95% polycrystalline

Question 30

Properties and charactersitics of the glass ceramics include:(a) efficiency in processing, (b) electrical conductor, (c) high thermal expansion, and (d)
strong, relative to other glasses?

Answer 30

a efficiency in porcessing, d strong relative to other galsses

Question 31

Diamond is the hardes material known

Answer 31

true (but graphene is harder)

Question 32

sunthetic diamonds date to o (a) ancient times, (b) 1800s, (c) 1950s, or (d) 1980.

Answer 32

c 1950s