Chapter 76 P2 Flashcards
CERAMICS
What is a cermaci
Inorganic coumpound consisting of metal (maybe semimetals) and one more more nonmetals
what are four most common elements in the earth’s crust
oxygen, silicon, aluminium and iron
what is the difference between traditional and new cermacis
tradiotionas are based in clayy products while new ceramics are simpler in chemical composition
what is the feature that distingueshes glass form traditional and new ceramics
it is amporphus, while most other cramics have a crystaline structurew
hat are the general mechanical properties of ceramic materials
hihg hardness, britlensess and no ductility
what are the general physical properties of ceramic materials
electrical and thermal insulating, medium density, high melting temp, and thermal expansion is less than metals
What type of atomic bonding characterizes tehc eramics
covalent and ionic
What do bauxite and corundum have in common
both minerals of alumina
What is clay, used in making ceramic products
Clay most commonly consists of hydrous aliuminum silicate, for example kaolinite is a common clay
What is glazieng
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
What does the term refractory mean
refractories are heat resistant ceramic materials. Also applied to metals that are heat ressitant
What are some of the principal applications of cement carvide
Include cutting tool inserts, drawind dies, rck drilling bits, dies for powder metallurgy and other applications where hardness is a crit. factor.
What are some of the important applications of titanium nitride
thin coating on cutting tools to prolong tool life
What are eements in the cermaic material Sialon
Sialon consists of the elements silicon,a luminum, oxygen and nitrogen
define glass
inroganic, nonmetalic material that cools to a rigid solid without crystalisation
what is the primary mineral in glass products
silica or silicon dioxide
what are some of the funcitons of the ingredients that are added to glass in addition to silica name at least three
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
devirtrification?
the transfomation form the glassy state into polycrystalline state
what is graphite
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
which of the following is the most commonelement in the earths crust (a) aluminum, (b)
calcium, (c) iron, (d) oxygen, or (e) silicon?
d ocygen
Glass products are bsed on which of the following minerals (a) alumina, (b)
corundum, (c) feldspar, (d) kaolinite, or (e) silica?
e silica
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?
a alumina, b bauxite, c corundum
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?
a aluminium oxide, ,d silicon carbide
which of the follwoing is generally the most porus of the clay-based pottery ware (a) china, (b)
earthenware, (c) porcelain, or (d) stoneware?
b earthenware
Which fot he following is fired at the highest temp. (a) china, (b) earthenware, (c)
porcelain, or (d) stoneware?
c porcelain
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?
b (wtf is that)
Glass ceramics are plyctystaline ceramic structures that have been transformed into the glassy state tru false
false. Glass ceramics are glasses that have been transformed into mostly crystalline form through heat tretement
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?
c cubic boron nitride
which of the following vest characterizes the structure of glass-ceramcis ) 95% polycrystalline, (b)
95% vitreous, or (b) 50% polycrystalline?
a 95% polycrystalline
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?
a efficiency in porcessing, d strong relative to other galsses
Diamond is the hardes material known
true (but graphene is harder)
sunthetic diamonds date to o (a) ancient times, (b) 1800s, (c) 1950s, or (d) 1980.
c 1950s
