The juwelen Diaries
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Die hardheid, poreusheid, kleur en toepassingsmoontlikhede van keramiek dangle af van die samestelling van die kleisoort, die hoogte van die temperatuur waarby dit gebak term en die baktyd daarvan.
This will make them ideal for surge-defense applications; as There exists Manage about the edge voltage and Strength tolerance, they obtain use in a number of purposes. The very best demonstration of their ability can be found in electrical substations, where by These are used to protect the infrastructure from lightning strikes. They've got speedy response, are low routine maintenance, and do not appreciably degrade from use, earning them practically great devices for this application. Semiconducting ceramics may also be utilized as fuel sensors. When various gases are passed about a polycrystalline ceramic, its electrical resistance changes. With tuning towards the attainable gasoline mixtures, extremely low-cost units is often manufactured.
By hierdie hoë temperatuur "smelt" die kleideeltjies as 't ware ineen en word die skerf so dig dat dit heeltemal ondeurdringbaar is. Meestal phrase grès, wat 'n blougrys of bruin kleur het, bedek achieved 'n "glasuur" wat ontstaan deur sout in die brandende oond te strooi. 'n Dun lagie slaan dan op die voorwerpe neer.
Experiments with ceramic areas for fuel turbine engines are being carried out. Currently, even blades crafted from Sophisticated steel alloys Employed in the engines' hot segment call for cooling and very careful monitoring of operating temperatures.
Omstreeks one thousand v.C. het daar 'n einde aan hierdie beskawings gekom. Daarna het 'n nuwe styl in die Griekse wêreld en veral op Petoponnesos start ontwikkel. Dit is die geometriese styI genoem en het tussen die 10e en 8e eeu v.
Cermax xenon arc lamp with artificial sapphire output window Optically clear components target the reaction of a cloth to incoming light waves of a range of wavelengths. Frequency selective optical filters could be utilized to alter or boost the brightness and distinction of the electronic graphic. Guided lightwave transmission by using frequency selective waveguides entails the emerging area of fiber optics and the power of selected glassy compositions to be a transmission medium for An array of frequencies at the same time (multi-manner optical fiber) with little if any interference between competing wavelengths or frequencies.
Dit was vir die ontwikkeling van die Europese keramiek van groot belang. Die Islamitiese pottebakkers het in die 8e-9e eeu ook die tegniek van glansglasuur ontwikkel: op 'n voorwerp wat reeds geglasuur en gebak is, term nog 'n lagie glasuur van metaaloksides aangebring. Dit phrase by 'n lae temperatuur op die oppervlak gefikseer en gee 'n metaalagtige glans daaraan.
The unit of time measured would be the purely natural interval required for electrical energy for being converted into mechanical Strength and again all over website again.
'n Vorm kan talle kere gebruik word, sodat reekse van dieselfde voorwerp gemaak kan word. Nadat dit die eerste keer gebak is, word die voorwerp in tinglasuur gedompel of die glasuur word daaroor gegiet. Hierdie glasuur is ondeursigtig wit nadat dit gebak is. Voordat die tinglasuur gebak term, word die versiering egter eers satisfied 'n ander glasuur, wat blou word (of 'n ander kleur kry) nadat dit gebak is, daarop aangebring.
Door deze brosheid zal het materiaal abrupt kunnen bezwijken wanneer er scheuren in ontstaan. Dit fenomeen is ook te zien bij een sterretje in de voorruit van een auto, dat spontaan kan doorscheuren over het materiaal.
Bijvoorbeeld de slijtvastheid van de keramiek en de vervormbaarheid van een metaal. Dit wordt bijvoorbeeld toegepast op gereedschap en messen.
Temper will likely be discovered by microscopic examination on the tempered materials. Clay identification is determined by a means of refiring the ceramic and assigning a colour to it using Munsell Soil Coloration notation. By estimating the two the clay and mood compositions and locating a location where both equally are identified to come about, an assignment of the fabric source is often produced. Depending on the resource assignment of the artifact, more investigations is often made into the website of manufacture.
The fabrication system and process circumstances are normally indicated because of the microstructure. The foundation cause of numerous ceramic failures is apparent while in the cleaved and polished microstructure. Actual physical Attributes which constitute the field of components science and engineering incorporate the next:
Die San se artikels was klein, grot en bros. Die potte en kruike wat deur die Khoi gemaak is, was besonder goed afgewerk, goed gebak en duursaam. In die suidelike dele van Namibië en oor groot dele van die Kaapprovinsie is skerwe gevind wat tot 2 000 jaar terugdateer. By die Hartsrivier in Noord-Kaapland is potskerwe van die Khoi saam satisfied skaap- en beesbene opgegrawe wat na raming 3 000 jaar oud is.