{"id":6600,"date":"2021-04-04T11:49:44","date_gmt":"2021-04-04T11:49:44","guid":{"rendered":"https:\/\/www.aluminaceramicball.com\/?p=6600"},"modified":"2021-04-12T06:49:53","modified_gmt":"2021-04-12T06:49:53","slug":"wprowadzenie-do-proszku-tlenku-glinu","status":"publish","type":"post","link":"https:\/\/www.aluminaceramicball.com\/pl\/wprowadzenie-do-proszku-tlenku-glinu\/","title":{"rendered":"Wprowadzenie do potrzeb i podstawowej wiedzy na temat proszku tlenku glinu"},"content":{"rendered":"

Proszek tlenku glinu<\/a> (Al2O3) to bia\u0142y amorficzny proszek, nale\u017c\u0105cy do tlenk\u00f3w nieorganicznych, nierozpuszczalny w wodzie, rozpuszczalny w mocnych zasadach i mocnych kwasach, temperatura topnienia 2054 \u00b0 C, temperatura wrzenia 2980 \u00b0 C, o wysokiej czysto\u015bci i bieli Wysoka, wysoka specyficzno\u015b\u0107, dobra stabilno\u015b\u0107 termiczna, jednolity rozk\u0142ad wielko\u015bci cz\u0105stek i dobra p\u0142ynno\u015b\u0107; tlenek glinu ma wiele izomer\u00f3w, a proszek tlenku glinu<\/a> przygotowana r\u00f3\u017cnymi metodami jest zupe\u0142nie inna. Trzy najcz\u0119\u015bciej spotykane formy krystaliczne tlenku glinu to: \u03b1-Al2O3, \u03b2-Al2O3 i \u03b3-Al2O3.<\/p>\n

(A) \u03b1-Al2O3, trygonalny uk\u0142ad krystaliczny, wyst\u0119puje w przyrodzie w postaci korundu, o zwartej strukturze, dobrej przewodno\u015bci cieplnej, jest najbardziej stabilnym typem kryszta\u0142u, a jego twardo\u015b\u0107 ust\u0119puje tylko diamentowi i w\u0119glikowi krzemu;<\/p>\n

(B) \u03b2-Al2O3, sze\u015bcienna struktura spinelowa, jony tlenu s\u0105 u\u0142o\u017cone w sze\u015bcienne centrowanie, a jony glinu wype\u0142niaj\u0105 luki. \u03b2-Al2O3 nie jest oddzieln\u0105 substancj\u0105 Al2O3, ale minera\u0142em polialuminianowym o wysokiej zawarto\u015bci tlenku glinu;<\/p>\n

(C) \u03b3-Al2O3 jest p\u00f3\u0142produktem transformacji z amorficznego Al2O3 do \u03b1-Al2O3 i jest niskotemperaturow\u0105 form\u0105 Al2O3. Struktura jest lu\u017ana, g\u0119sto\u015b\u0107 niewielka, aktywno\u015b\u0107 du\u017ca i \u0142atwo absorbuje wod\u0119. Nie mo\u017ce istnie\u0107 stabilnie w wysokiej temperaturze i nie wyst\u0119puje w przyrodzie.<\/p>\n

Produkcja proszku tlenku glinu zajmuje du\u017c\u0105 cz\u0119\u015b\u0107 ca\u0142kowitej produkcji sztucznego proszku ceramicznego na \u015bwiecie. Z ca\u0142kowitego zapotrzebowania na proszek tlenku glinu, ponad 80% jest wykorzystywane do wytapiania aluminium, a reszta mo\u017ce by\u0107 bezpo\u015brednio wykorzystywana w postaci proszku tlenku glinu jako surowce do produkcji innych produkt\u00f3w. Bezpo\u015brednio stosowany proszek tlenku glinu jest u\u017cywany g\u0142\u00f3wnie w materia\u0142ach ogniotrwa\u0142ych, drobnej ceramice, materia\u0142ach \u015bciernych itp. Proszek tlenku glinu o wysokiej czysto\u015bci jest zwykle u\u017cywany do przygotowania sztucznych kryszta\u0142\u00f3w, przezroczystego tlenku glinu, precyzyjnych element\u00f3w elektronicznych itp. Ponadto sztuczne kryszta\u0142y maj\u0105 bardzo wysokie wymagania jako\u015bciowe dla tlenku glinu o wysokiej czysto\u015bci, a wi\u0119kszo\u015b\u0107 z nich musi osi\u0105gn\u0105\u0107 czysto\u015b\u0107 5N. Chiny pozostaj\u0105 daleko w tyle za innymi krajami w przygotowywaniu tlenku glinu o wysokiej czysto\u015bci, a proszek o szczeg\u00f3lnie dobrej jako\u015bci nadal opiera si\u0119 na imporcie.<\/p>","protected":false},"excerpt":{"rendered":"

Alumina powder (Al2O3) is a white amorphous powder, belonging to inorganic oxide, insoluble in water, soluble in strong alkalis and strong acids, melting point 2054\u00b0C, boiling point 2980\u00b0C, with high purity and whiteness High, high specificity, good thermal stability, uniform particle size distribution and good fluidity; alumina has many isomers, and the alumina powder prepared 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