Advanced or technical ceramics

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Presentation transcript:

Advanced or technical ceramics Can take many forms: Multifunctional Ceramics Ferroelectrics Conductive Ceramics Dielectric Ceramics Magnetic Ceramics Etc. IMOS Intended for classroom instruction only. Do not circulate.

Advanced or technical ceramics Can take many forms: Multifunctional Ceramics Ferroelectrics Conductive Ceramics Dielectric Ceramics Magnetic CeramicsEtc. IMOS Intended for classroom instruction only. Do not circulate.

Multifunctional Ceramics IMOS Intended for classroom instruction only. Do not circulate. Methods of Transducing Energy

Intended for classroom instruction only. How do they work? Use the crystal structure to facilitate the transducer action: E.g. piezoelectric Quartz IMOS Intended for classroom instruction only. Do not circulate. Application of stress induces a positive and negative side to the crystal. This electric filed can be very large e.g. thousands of volts http://paganpath.com/study/academy/crystals/347-2

Multifunctional Ceramics IMOS Intended for classroom instruction only. Do not circulate. Other possibilities exist but at very inefficient (e.g. electrocaloric record is <12°C/480V/cm)

Advanced or technical ceramics Can take many forms: Multifunctional Ceramics Ferroelectrics Conductive Ceramics Dielectric Ceramics Magnetic Ceramics Etc. IMOS Intended for classroom instruction only. Do not circulate.

What other forms of these functional ceramics exist Ferroelectrics Display a permanent polarization after electric field is removed. Way of storing information Used in the chip for your smartcard Examples include BaTiO3 IMOS Intended for classroom instruction only. Do not circulate. http://cmt-stl.org/bringing-smart-cards-to-the-region/ http://what-when-how.com/electronic-properties-of-materials/electrical-properties-of-polymers-ceramics-dielectrics-and-amorphous-materials-part-3/

Advanced or technical ceramics Can take many forms: Multifunctional Ceramics Ferroelectrics Conductive Ceramics Dielectric Ceramics Magnetic Ceramics Etc. IMOS Intended for classroom instruction only. Do not circulate.

Intended for classroom instruction only. Conductive Ceramics Transparent conductive oxides Display a high electrical conductivity Are transparent in the visible regime Critical to flat panel displays, TV’s, IPhones, solar cells Examples include Indium Tin Oxide (ITO) Less expensive alternative is Aluminum Zinc Oxide (AZO) IMOS Intended for classroom instruction only. Do not circulate. http://bizbeatblog.dallasnews.com/tag/head-up-display/

Advanced or technical ceramics Can take many forms: Multifunctional Ceramics Ferroelectrics Conductive Ceramics Dielectric Ceramics Magnetic Ceramics Etc. IMOS Intended for classroom instruction only. Do not circulate.

Intended for classroom instruction only. Dielectric Ceramics Used to store electrical charge Unlike a battery the discharge is very rapid The ability to store charge is both materials and structure dependent Used in all circuits, Powering Transportation IMOS Intended for classroom instruction only. Do not circulate. Ceramic layer Charge capacitor at each bus stop http://citytransport.info/Electbus2.htm https://en.wikipedia.org/wiki/Polymer_capacitor

Advanced or technical ceramics Can take many forms: Multifunctional Ceramics Ferroelectrics Conductive Ceramics Dielectric Ceramics Magnetic Ceramics Etc. IMOS Intended for classroom instruction only. Do not circulate.

Intended for classroom instruction only. Magnetic Ceramics Lots of examples like superconductors, giant magntoresistance E.g. Ferrofluids : Fe3O4 or other magnetic oxides nanoparticles Average particle size 10nm with stabilizing surfactant Used for vacuum seals in space Examples of possible future uses include: cancer treatments microsatellite propulsion IMOS Intended for classroom instruction only. Do not circulate. http://fractalenlightenment.com/14637/artwork/fractal-sculptures-with-magnetic-ferrofluid Jian Zeng et al Journal of Magnetism and Magnetic Materials, Volume 346, 2013, 118–123

Intended for classroom instruction only. Summary Technical or functional ceramics can take many forms Multifunctional Ceramics, Ferroelectrics, Conductive Ceramics, Dielectric Ceramics, Magnetic Ceramics, etc. These materials require a number of steps in their operational chain of fabrication These range from mining/purchasing the raw materials, transportation, material preparation, processing of materials (synthesis, deposition etc.), scale up and yield improvement, distribution, intensification There are both scientific an social challenges associated with each step IMOS Intended for classroom instruction only. Do not circulate.