For each of the following material properties, mark whether metals or ceramics w

Question

For each of the following material properties, mark whether metals or ceramics would typically have a higher value (mark both if its not clear).

Ceramics                            Metals

Maximum Tensile Strength (Ideal)                           _______                             ______

Maximum Tensile Strength (in practice)                 _______                             ______

Elastic Modulus                                                              _______                             ______

Ductility                                                                           _______                             ______

Thermal Conductivity                                                   _______                             ______

Corrosion Resistance                                                   _______                             ______

Impact Toughness                                                         _______                             ______

Scratch Resistance                                                        _______                             ______

Ease of Manufacture                                                    _______                             ______

Cost                                                                                  _______                             ______

Prove the minimum ratio of the ionic radii in an octahedral pair (coordination # = 6) is 0.414. (Hint: Draw a picture of what a coordination number = 6 would look like)

Describe the difference in the atomic behaviors (specifically viscosity) of crystalline and amorphous ceramics as they heat up.

Determine the coordination number for the following pairs:

MgO

Al2S3

BaO

NiS

Which of the following is not an advantage of powder sintering

Faster processing

Ease of final shape processing

High Strength

Lower temperature/energy requirements

Assume you make a semi-conductor out of germanium, and dope it with nitrogen.   What type of semi-conductor is the result?

N-Type                -or-                       P-Type

Match the form of carbon to its description

Graphite

sp2 bonding, but folded on itself to get strength and 3-D stability together. Expensive to make, but promising properties.

Diamond

Single plane of extremely strong bonds, excellent conductivity.

Graphene

Planar structure of sp2 bonding, stacked in layers. Extremely strong in plane, weak between layers. Used as a lubricant.

Fullerenes/nanotubes

3-D crystalline structure of sp3 bonds. Extremely stable, so very hard

Graphite

sp2 bonding, but folded on itself to get strength and 3-D stability together. Expensive to make, but promising properties.

Diamond

Single plane of extremely strong bonds, excellent conductivity.

Graphene

Planar structure of sp2 bonding, stacked in layers. Extremely strong in plane, weak between layers. Used as a lubricant.

Fullerenes/nanotubes

3-D crystalline structure of sp3 bonds. Extremely stable, so very hard

Explanation / Answer

Max tensile strength ideal metal

Max tensile strength practice metal

Elastic modulus . Metal

Ductility . Metal because metals are drawn to wires

Thermal conductivity . Metal because ceramic is heat insyinsula material

Corrosion resistance ceramic materials

Impact toughness metal

Scratch resistant . Metal

Easy of manufacturing . Ceramic

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