Questions and answers
Ceramics
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Questions: 81
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Question 1
Examples of engineering, dielectric, optical ceramics
Engineering: oxide: Al2O3, non oxide: SiC Dielectric : strontium titanate (ST), calcium titanate (CT), magnesium titanate (MT), Optical ceramics: Al2O3, YAG, Nd: YAG, Yttrium oxide (Y2O3)
Question 2
Examples of ceramics with ionic bonding
MgO, CaO, Al2O3, ZrO2
Question 3
Examples of ceramics with covalent bonding
SiC, TiC, AlN, Si3N4
Question 4
Give a basic differences between the monocrystalline oxide compound and ceramics
Monocrystalline oxide is not necessarily sintered, Ceramics are sintered material and we know the way of the uprising
Question 5
Examples (3) of advanced ceramics
Si3N4, Zr2O3, SiC
Question 6
Examples (3) of traditional ceramics
faience (quartz+ feldspar), porcelain (kaolin+quartz+feldspar), stoneware (stoneware products are produced from clay raw materials)
Question 7
Main stages of ceramic technology
Raw materials → Chemical treatment → Milling → Batching → Mixing → Forming → Drying → Sintering → Final machining
Question 8
What parameters are essential for characterization of the given powder?
particle size (granulometry), particle shape (morhpology), deegre of fragmentation, chemical composition, purity, degree of crystallinity and concentration of defects
Question 9
How the surface energy of powder could be decreased?
Surface energy can be reduced by adding wetting agents
Question 10
Difference between an aggregate and an agglomerate
Aggregate - a collection of crystallites of common borders, An agglomerate - a collection of crystallites or aggregates that contact each other pointwise
Question 11
Difference between an agglomerate and a granule
The agglomerate is a spontaneously formed porous form composed of crystallites or aggregates contacting each other pointwise. Granula is a powder specially formulated in agglomerates with regular shapes, minimized porosity, created under conditions that allow slipping and dense packing.
Question 12
Types of bonding in granules
Van der Waals or resulting from binder, electrostatic bonding
Question 13
Types of bonding in agglomerates
Electrostatic or van der Waals, polymer
Question 14
List examples (3) of natural raw materials for ceramic industry
Clay, Silica, Kaolinite
Question 15
List the names (2) of natural hydroxides of alumina-silicates
Kaolinite (Al4[Si4O10](OH)8), Illite K0.6-0.85Al2(Si,Al)4O10(OH)2