Module 6 None-Metallic Materials Objective Four

Question 1

Ceramics

Answer 1

inorganic compounds where the primary bonds are ionic and/or covalent in a 3D structure

Question 2

Ionically Bonded Ceramics

Answer 2

complex compounds of a metal with a non-metal

Question 3

Covalent Ceramics

Answer 3

compounds of Two non-metals, or just pure elements

Question 4

Structures of Ceramics: Glasses

Answer 4

Silica based with other compound additions to decrease the melting range and other special properties.
Easily molded, but low creep resistance

Question 5

Structures of Ceramics: Vitreous Ceramics

Answer 5

made from clays which are formed in a wet plastic state, and then dried and fried. Held together by a glassy phase based on silica

Question 6

Structures of Ceramics: High performance Ceramics

Answer 6

cutting tools, dies, wear resistant parts

Question 7

Engineering Ceramics: Oxides

Answer 7

used as insulators, abrasive and wear parts, ballistic vests.
Includes aluminia Al2O3 Zirconia ZrO2 Silica SiO2 etc

Question 8

Engineering Ceramics: Carbides

Answer 8

Very high hardness, used in abrasives, cutting tools and wear resistant parts
Carbides of tungsten, chromium, silicon, boron, titantium, vanadium

Question 9

Engineering Ceramics: Nitrides

Answer 9

used for wear-resistant parts and specialized electronic devices, extremely thermal shock resistant, so they’re used for gas turbines and rocket engines

Question 10

Engineering Ceramics: Intermetallics

Answer 10

used in wear coatings, two metals together results in a different crystal structure from the constituents, resulting in special properties NiAl

Question 11

Engineering Ceramics: Diamond

Answer 11

highest naturally occurring hardness. Used in cutting tools, dies and abrasives

Question 12

Physical Vapour Deposition

Answer 12

when the substrate is placed in a vacuum chamber and the coating material is evaporated from a heated container. all surfaces in the line of sight are coated with the vapour (deposition)

Question 13

DC sputtering Techniques

Answer 13

a part is place in a vacuum with a small amount of argon. Then a high voltage DC current creates plasma between the part (anode) and the coating material (cathode), which sputters off its atoms through the plasma to coat the part

Question 14

Ion Plating

Answer 14

combines PVD and DC sputtering. The coating material is evaporated, then ionized by the plasma using an electron beam gun. The ionized ceramic bombards the substrate

Question 15

Chemical Vapour Deposition (CVD)

Answer 15

involves the deposition of coating material vapour on a preheated substrate. Does not require line of sight

Question 16

Plasma arc spray/High velocity thermal spray

Answer 16

processes melt and spray the ceramics onto a metal surface

Question 17

Ion Implantation

Answer 17

ions of one material impinging and embedding into the substrate with sufficient energy, which results in modification/improvement of the surface properties