.38-.45 Σεπτέμβριος 2, 2005 #21 Κοινοποίηση Σεπτέμβριος 2, 2005 μηπως πρεπει να ορισουμε τα κεραμικα καπως; ή το υλικο απο το οποιο ειναι φτιαγμενες οι δυο επιφανειεs του tec???γιατι αυτα που βρισκω, λενε για μονωση με κεραμικα υλικα. Min-K microporous insulation features the lowest thermal conductivity of any known insulation.The proprietary formulation of all BTU-BLOCK Link to comment Share on other sites More sharing options...
darkCount Σεπτέμβριος 2, 2005 #22 Κοινοποίηση Σεπτέμβριος 2, 2005 whilst ceramics are perceived as electrical and thermal insulators, ceramic oxides (initially based on Y-Ba-Cu-O) are the basis for high temperature superconductivity. Εκει το εξηγεί....Λογικά θα υπάρχουν διάφοροι τύποι και είδη κεραμικών. Τα συγκεκριμένα θεωρώ ότι δεν θα μπορούσαν να είναι μονωτές γιατί αλλιώς πως θα μεταφερόταν η θερμότητα απο τους ημιαγωγούς του τεκ? Link to comment Share on other sites More sharing options...
athlon=greek Σεπτέμβριος 2, 2005 Author #23 Κοινοποίηση Σεπτέμβριος 2, 2005 106.50euro στα multirama πιο παλια ειχε ακριβοτερα,παντως ειναι καλο εργαλειο,θα του βαλω ενα μεγαλυτερο fav και θα δειξει.Τώρα εχω 32-34 βαθμους περιπου. Link to comment Share on other sites More sharing options...
.38-.45 Σεπτέμβριος 2, 2005 #24 Κοινοποίηση Σεπτέμβριος 2, 2005 high temperature superconductivity υπεραγωγιμοτητα??? Ceramic materials are expected to be insulators -- certainly not superconductors, but that is just what Georg Bednorz and Alex Muller found when they studied the conductivity of a lanthanum-barium-copper oxide ceramic in 1986. Its critical temperature of 30 K was the highest which had been measured to date, but their discovery started a surge of activity which discovered superconducting behavior as high as 125 K.http://hyperphysics.phy-astr.gsu.edu/hbase/solids/hitc.htmlThermal conductivity - W/mK at 20°CProperties of different technical ceramicsALUMINA Al2O3 -- 20-30 ZIRCONIA ZrO2 -- 2-3 NITRIDE Si3N4 -- 35 CARBIDE SiC -- 110http://www.louwers.nl/materials/advanced-ceramics-properties.htmSilver -- 406.0Copper -- 385.0Brass --109.0Aluminum -- 205.0http://hyperphysics.phy-astr.gsu.edu/hbase/tables/thrcn.htmlPeltier element is called as a heat pump, it pumps heat from one side to the other by electric current. Al2O3 substrate is used as an electric insulator, but as the heat conductor. Therefore, the efficiency to Peltier element depends on its thermal conductivity. The thermal conductivity of commercial Al2O3 substrate is about 24 W/m.K while that of Al2O3 single crystal is 40. The objective of the development is to attain over 30 W/m.K using commercial Al2O3 powder as a raw material. www.sc.chula.ac.th/research/raynam/matsci.doc Link to comment Share on other sites More sharing options...
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