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MSE 2034 > Chapter 13 > Flashcards

Chapter 13 Flashcards

1
Q

What are 8 types of Ceramic materials?

A

1) Glasses (optical, composite)
2) Clay Products (whiteware)
3) Refractories (bricks for high temp)
4) Abrasives (sandpaper, cut, polish)
5) Cements (composites)
6) Ceramic Biomaterials (implants)
7) Carbon (abrasives, composites)
8) Advanced Ceramics (engine rotors, valves, bearings, sensors)

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2
Q

What are die blanks (or blanking die)?

A

A blanking die produces a flat piece of material by cutting the desired shape in one operation.

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3
Q

What are ceramic tools used for?

A

Grinding glass, tungsten, carbide, and ceramics. For cutting Si wafers and oil drilling.

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4
Q

What are materials used for ceramic tools?

A

Manufactured single crystal or polycrystalline diamonds in a metal or resin matrix.

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5
Q

What are refractory materials?

A

Materials that are to be used at high temperature.

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6
Q

What are advanced ceramics advantages?

A

Operate at high temp, low frictional loss, operate without a cooling system, lower weights than current engines.

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7
Q

What are advanced ceramics disadvantages?

A

Ceramic materials are brittle, difficult to remove internal voids (that weaken structures), ceramic parts are difficult to form and machine.

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8
Q

What is Fullerenes?

A

Spherical cluster of 60 carbon atoms, C_60 (Like a soccer ball).

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9
Q

What is carbon nanotubes?

A

Sheet of graphite rolled into a tube, ends capped with fullerene hemisphere.

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10
Q

What is Graphene?

A

Single-atomic-layer of graphite, composed of hexagonally sp^2 bonded carbon atoms.

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11
Q

What are the three ceramic fabrication methods?

A

Glass forming, particulate forming, cementation.

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12
Q

What is forms of glass forming?

A

Blowing of Glass bottles, Pressing, Fiber Drawing, Sheet forming.

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13
Q

What is Sheet Forming?

A

Sheets are formed by floating the molten glass on a pool of molten tin.

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14
Q

What are the different types of particulate forming?

A

Hydro-plastic forming, slip casting, powder pressing.

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15
Q

What is process of Cementation?

A

Hardening of paste, formation of rigid structures having varied and complex shapes, finally hardening process.

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16
Q

What is Blowing of Glass Bottles?

A

Gobs of heated glass from the furnace are directed to a molding machine and into the cavities where air is forced in to produce the neck and general container shape.

17
Q

What is Pressing?

A

Glass formed by application of pressure - mold is steel with graphite lining.

18
Q

What is Fiber drawing?

A

Thermal fiber drawing is a process in which a comparatively thicker structure is heated and drawn into extended lengths of microstructure fiber.

19
Q

What are some characteristics of glass?

A

Do not crystallize, change in slope is spec. vol. curve at glass transition temperature, transparent - no grain boundaries to scatter light.

20
Q

What is viscosity?

A

Relates shear stress and velocity gradient.

21
Q

Effects of Annealing on glass?

A

Removes internal stresses caused by uneven cooling.

22
Q

Effects of Tempering on glass?

A

Puts surface of glass part into compression, suppresses growth of cracks from surface scratches.

23
Q

What is hydro-plastic forming?

A

The most common hydro-plastic forming technique is extrusion, in which a stiff plastic ceramic mass is forced through a die orifice having the desired cross sectional geometry; it is similar to the extrusion of metals

24
Q

What is typical Porcelain composition?

A

50 % Clay, 25 % Filler (quartz finely grounded), Fluxing agent (Feldspar)

25
Q

What is Drying?

A

As water is removed - interparticle spacings decrease - shrinkage?

26
Q

What is firing?

A

Heat treatment between 900-1400 degrees Celsius.

27
Q

What is vitrification?

A

Liquid glass forms from clay and flux - flows between SiO_2 particles.

28
Q

What is the power pressing

A
29
Q

What is Sintering?

A

Occurs during firing of a piece that has been powder pressed, power particles coalesce and reduction of pore size.

30
Q

What is Tape Casting?

A

Thin sheets of green ceramic cast as flexible tape. Used for integrated circuits and capacitors.

31
Q

What is Porosity?

A

Porosity is the percentage of void space in a rock. It is defined as the ratio of the volume of the voids or pore space divided by the total volume.

32
Q

Abrasive ceramics include what?

A

Diamond, Aluminum Oxide, Silica Sand, Tungsten Carbide, and Silicon Carbide,

MSE 2034 (6 decks)

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