{"id":631,"date":"2024-08-21T04:47:19","date_gmt":"2024-08-20T20:47:19","guid":{"rendered":"https:\/\/ceramicatijolart.com\/?p=631"},"modified":"2024-08-21T04:47:20","modified_gmt":"2024-08-20T20:47:20","slug":"co-je-to-oxid-hlinity","status":"publish","type":"post","link":"https:\/\/ceramicatijolart.com\/sk\/co-je-to-oxid-hlinity\/","title":{"rendered":"\u010co je to oxid hlinit\u00fd?"},"content":{"rendered":"<p>Oxid hlinit\u00fd je hlavnou zlo\u017ekou hlin\u00edka. Na jeho z\u00edskanie z bauxitu (lateritov\u00e9ho nerastu bohat\u00e9ho na hlin\u00edk) sa pou\u017e\u00edva Bayerov proces. Ten spo\u010d\u00edva v rozpusten\u00ed nerastov obsahuj\u00facich hlin\u00edk v roztoku hydroxidu sodn\u00e9ho a n\u00e1slednom vysr\u00e1\u017ean\u00ed kry\u0161t\u00e1lov hlinitanu sodn\u00e9ho z tohto roztoku.<\/p>\n<p>Keramika z oxidu hlinit\u00e9ho je hust\u00fd, odoln\u00fd materi\u00e1l s vynikaj\u00facimi elektrick\u00fdmi vlastnos\u0165ami. Pou\u017e\u00edva sa v r\u00farkach, izol\u00e1toroch a v \u010fal\u0161\u00edch priemyseln\u00fdch aplik\u00e1ci\u00e1ch.<\/p>\n<h2>Oxid hlinit\u00fd je miner\u00e1l<\/h2>\n<p>Oxid hlinit\u00fd (tie\u017e ozna\u010dovan\u00fd ako Al\u2082O\u2083) je biely, zrnit\u00fd miner\u00e1l podobn\u00fd kuchynskej soli alebo jemn\u00e9mu pr\u00e1\u0161ku, ktor\u00fd zohr\u00e1va k\u013e\u00fa\u010dov\u00fa \u00falohu pri v\u00fdrobe hlin\u00edka a \u0161iroko sa vyu\u017e\u00edva v priemyselnej keramike, br\u00fasnych prostriedkoch a materi\u00e1loch na le\u0161tenie a leptanie. Oxid hlinit\u00fd sl\u00fa\u017ei tie\u017e ako izola\u010dn\u00fd materi\u00e1l pri v\u00fdrobe zeolitov, pri povrchovej \u00faprave tit\u00e1nov\u00fdch pigmentov, ako aj pri v\u00fdrobe retard\u00e9rov horenia a prostriedkov na potla\u010denie dymu.<\/p>\n<p>Keramika z oxidu hlinit\u00e9ho je ve\u013emi tvrd\u00e1 a pevn\u00e1, v\u010faka \u010domu je odoln\u00e1 vo\u010di mechanick\u00e9mu opotrebeniu. Okrem toho je v\u010faka svojej vynikaj\u00facej odolnosti vo\u010di kor\u00f3zii, er\u00f3zii a chemick\u00fdm vplyvom vhodn\u00e1 pre pou\u017eitie vo vysokoteplotn\u00fdch prostrediach a z\u00e1rove\u0148 je bioinertn\u00e1 \u2013 \u010do ju predur\u010duje na pou\u017eitie v medic\u00ednskych implant\u00e1toch a in\u00fdch medic\u00ednskych aplik\u00e1ci\u00e1ch.<\/p>\n<p>\u201cPojem \u201doxid hlinit\u00fd\u201c ozna\u010duje \u010dist\u00fd oxid hlinit\u00fd s chemick\u00fdm vzorcom Al\u2082O\u2083. Vo\u013en\u00fd oxid hlinit\u00fd sa prirodzene vyskytuje vo forme korundu alebo drahokamov, ako s\u00fa rub\u00edn a zaf\u00edr; synteticky vyr\u00e1ban\u00e9 formy sl\u00fa\u017eia ako v\u00fdchodiskov\u00e1 surovina pre pokro\u010dil\u00e9 keramick\u00e9 v\u00fdrobky, ako aj na tavenie kovov\u00e9ho hlin\u00edka.<\/p>\n<p>V\u010faka svojej vynikaj\u00facej odolnosti proti oderu je oxid hlinit\u00fd neocenite\u013enou surovinou pri v\u00fdrobe \u017eiaruvzdorn\u00fdch materi\u00e1lov, keramiky a br\u00fasnych materi\u00e1lov. Okrem toho s\u00fa jeho elektrick\u00e9 izola\u010dn\u00e9 vlastnosti a vysok\u00e1 tepeln\u00e1 vodivos\u0165 d\u00f4vodom, pre\u010do je oxid hlinit\u00fd nevyhnutnou zlo\u017ekou technickej keramiky ur\u010denej pre n\u00e1ro\u010dn\u00e9 aplik\u00e1cie, ktor\u00e9 si vy\u017eaduj\u00fa zv\u00fd\u0161en\u00fa odolnos\u0165 proti opotrebeniu a ochranu proti kor\u00f3zii.<\/p>\n<p>Technick\u00e1 keramick\u00e1 oxid hlinit\u00e1 sa \u010dasto vyr\u00e1ba Bayerov\u00fdm procesom, pri ktorom sa pomocou hydroxidu sodn\u00e9ho rozp\u00fa\u0161\u0165aj\u00fa a odde\u013euj\u00fa miner\u00e1ly obsahuj\u00face hlin\u00edk z rozomlet\u00e9ho bauxitu. \u010cerven\u00fd kal vznikaj\u00faci v tejto f\u00e1ze sa n\u00e1sledne zahrieva v peci, a\u017e k\u00fdm sa z neho nevytvor\u00ed \u010dist\u00fd oxid hlinit\u00fd ako kone\u010dn\u00fd produkt. Po vytvoren\u00ed sa tento materi\u00e1l mus\u00ed rozomlie\u0165 na jemn\u00e9 \u010dastice, aby sa zn\u00ed\u017eil obsah dut\u00edn a zv\u00fd\u0161ila hustota; pri teplote 77 \u00b0F (25 \u00b0C) dosahuje jeho hustota 3,965 g\/cm\u00b3. Po vytvoren\u00ed do r\u00f4znych tvarov pomocou vstrekovania, lisovania, izostatick\u00e9ho lisovania, liatia z ka\u0161e, liatia z ka\u0161e alebo techniky diamantov\u00e9ho obr\u00e1bania.<\/p>\n<h2>Oxid hlinit\u00fd je kov<\/h2>\n<p>Oxid hlinit\u00fd, alebo Al\u2082O\u2083, je anorganick\u00e1 zl\u00fa\u010denina s chemick\u00fdm vzorcom Al\u2082O\u2083, ktor\u00e1 sl\u00fa\u017ei ako hlavn\u00e1 zlo\u017eka hlin\u00edka \u2013 kovu, ktor\u00fd m\u00e1 pred sebou perspekt\u00edvu v\u00fdznamn\u00e9ho rozmachu v dne\u0161nej n\u00edzkouhl\u00edkovej ekonomike. Oxid hlinit\u00fd sa d\u00e1 z\u00edskava\u0165 z bauxitu Bayerov\u00fdm procesom a vyu\u017e\u00edva sa v r\u00f4znych oblastiach; najm\u00e4 pri v\u00fdrobe \u017eiaruvzdorn\u00fdch materi\u00e1lov, keramiky, le\u0161tiacich materi\u00e1lov a br\u00fasiv \u2013 naj\u010dastej\u0161ie pri v\u00fdrobe \u017eiaruvzdorn\u00fdch materi\u00e1lov, keramiky a le\u0161tiacich br\u00fasiv, ako aj substr\u00e1tov a tunelov\u00fdch bari\u00e9r v supravodiv\u00fdch zariadeniach \u2013 a tie\u017e ako cenn\u00e1 surovina v mnoh\u00fdch priemyseln\u00fdch odvetviach.<\/p>\n<p>Oxid hlinit\u00fd sa d\u00e1 vyr\u00e1ba\u0165 v r\u00f4znych form\u00e1ch, od hrub\u00fdch z\u0155n a\u017e po jemn\u00e9 pr\u00e1\u0161ky a bloky \u010di pelety ur\u010den\u00e9 na v\u00fdrobu a na pou\u017eitie pri abraz\u00edvnom tryskan\u00ed. Okrem toho aktivovan\u00fd oxid hlinit\u00fd (por\u00e9zna forma oxidu hlinit\u00e9ho) sl\u00fa\u017ei ako nosi\u010d katalyz\u00e1tora v chemick\u00fdch procesoch, ako aj ako adsorbent, ktor\u00fd absorbuje vodu z plynov a kvapal\u00edn; \u010falej zohr\u00e1va k\u013e\u00fa\u010dov\u00fa \u00falohu pri v\u00fdrobe \u017eiaruvzdorn\u00fdch v\u00fdrobkov, ako s\u00fa v\u00fdmurovky pec\u00ed, zliev\u00e1rensk\u00fd piesok a mlecie prostriedky.<\/p>\n<p>Kalcinovan\u00fd oxid hlinit\u00fd je najroz\u0161\u00edrenej\u0161ou formou oxidu hlinit\u00e9ho. Existuje v mnoh\u00fdch triedach a typoch ur\u010den\u00fdch na v\u00fdrobu \u017eiaruvzdorn\u00fdch materi\u00e1lov a keramiky, pri\u010dom tabu\u013ekov\u00fd oxid hlinit\u00fd, ktor\u00fd sa vyr\u00e1ba spekan\u00edm kalcinovan\u00fdch guli\u010diek oxidu hlinit\u00e9ho, m\u00e1 vysok\u00fa pevnos\u0165 a tepeln\u00fa kapacitu a zachov\u00e1va si pevnos\u0165 v oxida\u010dn\u00fdch aj reduk\u010dn\u00fdch podmienkach, ako aj v kysl\u00fdch a z\u00e1sadit\u00fdch prostrediach.<\/p>\n<p>Aluminosilik\u00e1tov\u00e9 sklo obsahuje 5\u201310% oxidu hlinit\u00e9ho a vyu\u017e\u00edva sa v mnoh\u00fdch komer\u010dn\u00fdch a priemyseln\u00fdch aplik\u00e1ci\u00e1ch. Aluminosilik\u00e1t, ktor\u00fd sa v\u010faka svojej jedine\u010dnej kombin\u00e1cii fyzik\u00e1lnych a tepeln\u00fdch vlastnost\u00ed ozna\u010duje aj ako technick\u00e1 keramika, sa \u0161iroko vyu\u017e\u00edva pre svoju odolnos\u0165 proti kor\u00f3zii, ako aj v prostrediach s vysok\u00fdmi teplotami, kde sa m\u00f4\u017eu vyskytova\u0165 aplik\u00e1cie vy\u017eaduj\u00face odolnos\u0165 vo\u010di vysok\u00fdm teplot\u00e1m, ako s\u00fa ochrann\u00e9 r\u00farky alebo k\u013azav\u00e9 lo\u017eisk\u00e1 v \u010derpadl\u00e1ch.<\/p>\n<p>Na rozdiel od v\u00e4\u010d\u0161iny anorganick\u00fdch materi\u00e1lov sa oxid hlinit\u00fd vo vode nerozp\u00fa\u0161\u0165a. Hoci je nerozpustn\u00fd vo v\u00e4\u010d\u0161ine organick\u00fdch rozp\u00fa\u0161\u0165adiel a kysel\u00fdch roztokov, je rozpustn\u00fd v hor\u00facich kysel\u00fdch roztokoch a vo vriacich roztokoch kyseliny chlorovod\u00edkovej. \u0160t\u00fadie inhal\u00e1cie r\u00e1dioakt\u00edvne zna\u010den\u00e9ho gama-oxid hlinit\u00fd (26AlO) preuk\u00e1zali, \u017ee sa spr\u00e1va ako nerozpustn\u00e1 prachov\u00e1 \u010dastica a v\u00e4\u010d\u0161ina bola vyl\u00fa\u010den\u00e1 do jedn\u00e9ho d\u0148a, pri\u010dom zvy\u0161n\u00fd 45% bol pomaly mechanicky vyl\u00fa\u010den\u00fd v priebehu 72 dn\u00ed.<\/p>\n<h2>Oxid hlinit\u00fd je keramick\u00fd materi\u00e1l<\/h2>\n<p>Alumina je priemyseln\u00e1 oxidov\u00e1 keramika zn\u00e1ma svojou trvanlivos\u0165ou a odolnos\u0165ou proti kor\u00f3zii. Alumina, ktor\u00e1 sa vyr\u00e1ba z bauxitu, sa d\u00e1 tvarova\u0165 pomocou vstrekovania, lisovania, izostatick\u00e9ho lisovania, liatia z ka\u0161e alebo diamantov\u00e9ho obr\u00e1bania do najr\u00f4znej\u0161\u00edch tvarov, ve\u013ekost\u00ed alebo kval\u00edt v z\u00e1vislosti od jej pou\u017eitia \u2013 vr\u00e1tane elektrick\u00fdch komponentov, ako s\u00fa izol\u00e1tory alebo vysokoteplotn\u00e9 kondenz\u00e1tory; balistiku (na absorpciu a rozpt\u00fdlenie kinetickej energie projektilu); alebo sa v balistike pou\u017e\u00edva ako prv\u00e1 vrstva panciera proti projektilom.<\/p>\n<p>Oxid hlinit\u00fd sa v pr\u00edrode vyskytuje vo forme korundu a synteticky sa vyr\u00e1ba vo forme zaf\u00edru a rub\u00ednu. Oxid hlinit\u00fd sl\u00fa\u017ei ako hlavn\u00e1 surovina pri v\u00fdrobe hlin\u00edka a je tie\u017e d\u00f4le\u017eitou zlo\u017ekou r\u00f4znych priemyseln\u00fdch keram\u00edk. Vyzna\u010duje sa vysok\u00fdm modulom pru\u017enosti, vynikaj\u00facou tepelnou vodivos\u0165ou, odolnos\u0165ou proti opotrebeniu a chemick\u00fdm vplyvom, v\u010faka \u010domu je odoln\u00fd vo\u010di opotrebeniu a chemick\u00fdm vplyvom.<\/p>\n<p>Oxid hlinit\u00fd sa zvy\u010dajne vyr\u00e1ba vo forme pr\u00e1\u0161ku rafin\u00e1ciou bauxitu, hojn\u00e9ho \u00edlovit\u00e9ho materi\u00e1lu, ktor\u00fd sa vyskytuje po celom svete, na jemn\u00e9 \u010dastice naz\u00fdvan\u00e9 \u201ckalcinovan\u00fd oxid hlinit\u00fd\u201d. Tento materi\u00e1l m\u00e1 vynikaj\u00face mechanick\u00e9 vlastnosti a d\u00e1 sa z neho vyr\u00e1ba\u0165 cel\u00fd rad produktov, medzi ktor\u00e9 patria izol\u00e1tory zapa\u013eovac\u00edch svie\u010dok, svorky elektrick\u00fdch komponentov a \u017eiaruvzdorn\u00e9 v\u00fdstelky pec\u00ed; okrem toho sa vyu\u017e\u00edva pri v\u00fdrobe \u010fal\u0161\u00edch chemik\u00e1li\u00ed na b\u00e1ze oxidu hlinit\u00e9ho (\u017eiaruvzdorn\u00e9 tehly), ako aj pri v\u00fdrobe skla.<\/p>\n<p>Tabul\u00e1rny oxid hlinit\u00fd sa vyr\u00e1ba spekan\u00edm drven\u00fdch a rafinovan\u00fdch gu\u013e\u00f4\u010dok z pr\u00e1\u0161ku oxidu hlinit\u00e9ho, \u010d\u00edm sa dosahuje vysok\u00e1 \u017eiaruvzdornos\u0165 a tvrdos\u0165 na \u00farovni 9 stup\u0148ov pod\u013ea Mohsovej stupnice. Medzi jej k\u013e\u00fa\u010dov\u00e9 v\u00fdhody patr\u00ed vysok\u00e1 tepeln\u00e1 kapacita, v\u00fdnimo\u010dn\u00e1 teplotn\u00e1 stabilita, n\u00edzka elektrick\u00e1 vodivos\u0165 pri vysok\u00fdch teplot\u00e1ch, odolnos\u0165 proti kor\u00f3zii sp\u00f4sobenej kyselinami a z\u00e1sadami a dobr\u00e9 dielektrick\u00e9 vlastnosti pri frekvenci\u00e1ch v gigahertzovom rozsahu.<\/p>\n<p>V\u010faka svojej odolnosti vo\u010di extr\u00e9mnym teplot\u00e1m a kor\u00f3zii je oxid hlinit\u00fd univerz\u00e1lnym materi\u00e1lom, ktor\u00fd je ide\u00e1lny pre mnoh\u00e9 r\u00f4zne pou\u017eitia. V\u010faka \u013eahkej obrobite\u013enosti je oxid hlinit\u00fd vynikaj\u00facou vo\u013ebou v pr\u00edpadoch, kde je d\u00f4le\u017eit\u00e1 presnos\u0165; \u0161iroko sa vyu\u017e\u00edva najm\u00e4 v keramick\u00fdch povlakoch trysiek a trec\u00edch s\u00fa\u010diastok, ako aj ako materi\u00e1l odoln\u00fd vo\u010di vysok\u00e9mu tlaku v rezn\u00fdch n\u00e1strojoch.<\/p>\n<h2>Oxid hlinit\u00fd je materi\u00e1l<\/h2>\n<p>Oxid hlinit\u00fd je priemyseln\u00e1 keramika, ktor\u00fa mo\u017eno \u013eahko tvarova\u0165 do r\u00f4znych tvarov a ve\u013ekost\u00ed, v\u010faka \u010domu je to univerz\u00e1lny materi\u00e1l vhodn\u00fd pre mnoh\u00e9 odvetvia, vr\u00e1tane elektroniky. V\u010faka vysokej teplotnej odolnosti, dobr\u00fdm mechanick\u00fdm vlastnostiam a vynikaj\u00facej odolnosti proti kor\u00f3zii je oxid hlinit\u00fd k\u013e\u00fa\u010dovou technickou keramikou. Oxid hlinit\u00fd je mo\u017en\u00e9 dokonca urobi\u0165 prieh\u013eadn\u00fdm pomocou \u010dast\u00edc zirk\u00f3nu alebo vl\u00e1kien karbidu krem\u00edka \u2013 v\u010faka svojej prieh\u013eadnosti je ide\u00e1lny pre vysokotlakov\u00e9 sod\u00edkov\u00e9 v\u00fdbojky.<\/p>\n<p>V\u010faka svojej chemickej inertnosti a n\u00edzkej reaktivite je oxid hlinit\u00fd vysoko odoln\u00fd vo\u010di kyselin\u00e1m a z\u00e1sad\u00e1m pri vysok\u00fdch teplot\u00e1ch; jeho bioinertnos\u0165 ho predur\u010duje na pou\u017eitie v lek\u00e1rskych implant\u00e1toch a jeho nereaktivita vo\u010di siln\u00fdm kyselin\u00e1m a z\u00e1sad\u00e1m z neho rob\u00ed vynikaj\u00faci materi\u00e1l odoln\u00fd vo\u010di oderu, ktor\u00fd odol\u00e1va aj kor\u00f3zii na vzduchu alebo v kvapalin\u00e1ch. Oxid hlinit\u00fd je tie\u017e odoln\u00fd vo\u010di oxid\u00e1cii a kor\u00f3zii.<\/p>\n<p>Bauxit, ktor\u00fd obsahuje ve\u013ek\u00e9 mno\u017estvo oxidu hlinit\u00e9ho, je hlavn\u00fdm zdrojom pre v\u00fdrobu oxidu hlinit\u00e9ho. Pri Bayerovom procese sa extrahuje zmie\u0161an\u00edm hydroxidu sodn\u00e9ho za tepla a tlaku, \u010d\u00edm sa rozpustia miner\u00e1ly obsahuj\u00face hlin\u00edk v bauxite; n\u00e1slednou kry\u0161taliz\u00e1ciou a su\u0161en\u00edm v rota\u010dn\u00fdch peciach sa z\u00edska \u010dist\u00fd oxid hlinit\u00fd, ktor\u00fd sa potom m\u00f4\u017ee pomocou r\u00f4znych techn\u00edk a tepeln\u00e9ho spracovania premeni\u0165 na r\u00f4zne v\u00fdrobky.<\/p>\n<p>V z\u00e1vislosti od \u00fa\u010delu pou\u017eitia sa oxid hlinit\u00fd d\u00e1 spracova\u0165 do r\u00f4znych foriem, tvarov a kvalitat\u00edvnych tried; medzi ne patria aglomerovan\u00e9, kalcinovan\u00e9 a tabu\u013ekov\u00e9 formy. Aglomerovan\u00e9 formy s\u00fa ide\u00e1lne ako suroviny pre keramick\u00e9 procesy, ako je napr\u00edklad spekanie. Kalcinovan\u00e9 formy sa vyu\u017e\u00edvaj\u00fa v aplik\u00e1ci\u00e1ch, ako s\u00fa br\u00fasiv\u00e1, \u017eiaruvzdorn\u00e9 materi\u00e1ly a vysokonap\u00e4\u0165ov\u00e9 priechodky, zatia\u013e \u010do tabu\u013ekov\u00e9 formy poskytuj\u00fa hermetickos\u0165 pre pou\u017eitie ako keramicko-kovov\u00e9 priechodky, r\u00f6ntgenov\u00e9 komponenty alebo vysokonap\u00e4\u0165ov\u00e9 priechodky.<\/p>\n<p>Oxid hlinit\u00fd je nenahradite\u013en\u00fd materi\u00e1l, ktor\u00fd nach\u00e1dza uplatnenie v celom rade odvetv\u00ed. O\u010dak\u00e1va sa, \u017ee jeho popularita medzi pracovn\u00edkmi v elektronickom priemysle bude r\u00fdchlo r\u00e1s\u0165 v\u010faka jeho elektrick\u00fdm a tepeln\u00fdm izola\u010dn\u00fdm vlastnostiam, ako aj vynikaj\u00facej odolnosti proti oteru a opotrebeniu. V\u010faka svojej cenovej dostupnosti je oxid hlinit\u00fd \u013eahko dostupn\u00fd a d\u00e1 sa z neho vytv\u00e1ra\u0165 r\u00f4zne tvary. Navy\u0161e m\u00e1 n\u00edzku hmotnos\u0165, \u010do u\u013eah\u010duje manipul\u00e1ciu s n\u00edm.<\/p>","protected":false},"excerpt":{"rendered":"<p>Alumina is the primary element in aluminum. To extract it from bauxite (an aluminum-rich laterite mineral), using the Bayer process. This involves dissolving aluminum-bearing minerals into caustic soda solution before precipitating crystalline sodium aluminate crystals from their solution. Alumina ceramics are dense, long-wearing materials with outstanding electrical properties. 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