{"id":84,"date":"2024-05-31T02:28:40","date_gmt":"2024-05-30T18:28:40","guid":{"rendered":"https:\/\/aluminaceramics.net\/?p=84"},"modified":"2024-07-15T20:21:08","modified_gmt":"2024-07-15T12:21:08","slug":"co-je-oxid-hlinity-cte","status":"publish","type":"post","link":"https:\/\/aluminaceramics.net\/sk\/what-is-alumina-cte\/","title":{"rendered":"\u010co je hlin\u00edk CTe?"},"content":{"rendered":"<p>Hlin\u00edk cte je modern\u00fd \u017eiaruvzdorn\u00fd materi\u00e1l s vynikaj\u00facou pri\u013enavos\u0165ou, ktor\u00fd sa d\u00e1 \u013eahko formova\u0165 do tvarov bl\u00edzkych sieti pomocou r\u00f4znych met\u00f3d konsolid\u00e1cie a spekania, \u010do umo\u017e\u0148uje presn\u00e9 formovanie bl\u00edzko siete. Okrem toho je tento materi\u00e1l v\u010faka svojej elektrickej odolnosti a odolnosti vo\u010di tepeln\u00fdm \u0161okom ve\u013emi vyh\u013ead\u00e1van\u00fd.<\/p>\n<p>Hlin\u00edk sa m\u00f4\u017ee pochv\u00e1li\u0165 extr\u00e9mne n\u00edzkym koeficientom tepelnej roz\u0165a\u017enosti (CTE), v\u010faka \u010domu je vhodn\u00fd na keramicko-kovov\u00e9 priechodky a izol\u00e1tory, priechodky pre r\u00f6ntgenov\u00e9 komponenty a komponenty v\u00e1kuov\u00fdch v\u00fdvev.<\/p>\n<h2>Koeficient tepelnej roz\u0165a\u017enosti<\/h2>\n<p>Koeficient tepelnej roz\u0165a\u017enosti (CTE) materi\u00e1lu ozna\u010duje r\u00fdchlos\u0165 n\u00e1rastu d\u013a\u017eky na jednotku zv\u00fd\u0161enia teploty alebo reakciu na zmeny teploty, ktor\u00e1 z\u00e1vis\u00ed od \u0161pecifick\u00fdch tvarov at\u00f3mov a medzimolekulov\u00fdch s\u00edl, ktor\u00e9 ich dr\u017eia pohromade. Merania CTE mo\u017eno vykona\u0165 bu\u010f konkr\u00e9tne pri jednej teplote, alebo v nieko\u013ek\u00fdch teplotn\u00fdch rozsahoch, aby sa z\u00edskal stredn\u00fd koeficient (a). CTE m\u00f4\u017ee by\u0165 ovplyvnen\u00e1 aj vonkaj\u0161\u00edmi vplyvmi, ako s\u00fa tlak, magnetick\u00e9 a elektrick\u00e9 polia, ktor\u00e9 menia usporiadanie at\u00f3mov v materi\u00e1loch.<\/p>\n<p>Oxid hlinit\u00fd (Al2O3) je umel\u00e1 keramika s chemick\u00fdm zlo\u017een\u00edm Al2O3. Medzi jeho vlastnosti patr\u00ed vysok\u00e1 mechanick\u00e1 pevnos\u0165, tvrdos\u0165, odolnos\u0165 proti opotrebovaniu a je jedn\u00fdm z dvoch najtvrd\u0161\u00edch technick\u00fdch materi\u00e1lov (druh\u00fd po karbide krem\u00edka). V\u010faka t\u00fdmto vlastnostiam je oxid hlinit\u00fd ide\u00e1lny pre aplik\u00e1cie vr\u00e1tane vysokovakuov\u00fdch zariaden\u00ed, vojensk\u00fdch aplik\u00e1ci\u00ed a leteck\u00fdch s\u00fa\u010diastok - a tie\u017e je vhodn\u00fd na metaliz\u00e1ciu v\u010faka svojej vynikaj\u00facej odolnosti vo\u010di kor\u00f3zii a teplu.<\/p>\n<p>Pochopenie rozdielov v hodnot\u00e1ch CTE r\u00f4znych materi\u00e1lov pri ich v\u00fdbere pre aplik\u00e1ciu je ve\u013emi d\u00f4le\u017eit\u00e9. Hlin\u00edk m\u00e1 ove\u013ea vy\u0161\u0161iu hodnotu CTE ako me\u010f, \u010do by mohlo sp\u00f4sobi\u0165 komplik\u00e1cie pri sp\u00e1jan\u00ed rozdielnych kovov v aplik\u00e1ci\u00e1ch, ako s\u00fa elektrick\u00e9 k\u00e1ble, kde by dilata\u010dn\u00e9 sily mohli sp\u00f4sobi\u0165 \u0161kodliv\u00e9 sily v spojoch a vies\u0165 k de\u0161trukt\u00edvnym sil\u00e1m v spojoch.<\/p>\n<p>Na minimaliz\u00e1ciu t\u00fdchto \u00fa\u010dinkov je najlep\u0161ie vybera\u0165 kovy s n\u00edzkymi hodnotami CTE a vzia\u0165 na vedomie, \u017ee niektor\u00e9 materi\u00e1ly sa rozp\u00ednaj\u00fa \u00famerne svojej teplote; to znamen\u00e1, \u017ee ak by sa teplota zdvojn\u00e1sobila, tento materi\u00e1l by sa rozp\u00ednal \u0161tvorn\u00e1sobne!<\/p>\n<p>Line\u00e1rna tepeln\u00e1 roz\u0165a\u017enos\u0165 (LTE) je z\u00e1kladnou charakteristikou materi\u00e1lov, preto\u017ee s\u00favis\u00ed s ich modulom pru\u017enosti, Youngov\u00fdm modulom a plochou prierezu. Okrem toho LTE ovplyv\u0148uje aj bezdeforma\u010dn\u00fa teplotu Tref a mo\u017eno ju ur\u010di\u0165 pomocou diferenci\u00e1lnej termickej anal\u00fdzy (DTA).<\/p>\n<p>Na ur\u010denie line\u00e1rnej tepelnej roz\u0165a\u017enosti materi\u00e1lov sa sk\u00fa\u0161obn\u00e9 vzorky zmrazia a zmeraj\u00fa sa ich rozmerov\u00e9 zmeny; tieto v\u00fdsledky sa potom porovnaj\u00fa s ich p\u00f4vodn\u00fdmi hodnotami, aby sa zistila hodnota koeficientu tepelnej roz\u0165a\u017enosti (CTE). V\u00fdsledky CTE z\u00e1visia od r\u00f4znych faktorov vr\u00e1tane zlo\u017eenia a geometrie vzorky, techn\u00edk merania d\u013a\u017eky a teploty, ako aj od \u0161tandardn\u00fdch alebo akceptovan\u00fdch hodn\u00f4t CTE.<\/p>\n<h2>Youngov modul<\/h2>\n<p>Youngov modul meria odolnos\u0165 materi\u00e1lov vo\u010di ohybu alebo tlaku. In\u017einieri t\u00fato vlastnos\u0165 vyu\u017e\u00edvaj\u00fa pri navrhovan\u00ed kon\u0161trukci\u00ed tak, aby odolali primeran\u00fdm \u00farovniam nam\u00e1hania, a pou\u017e\u00edva sa aj ako met\u00f3da hodnotenia ich pru\u017en\u00fdch vlastnost\u00ed - uis\u0165uje sa, \u017ee vydr\u017eia opakovan\u00e9 pou\u017e\u00edvanie v n\u00e1ro\u010dn\u00fdch podmienkach.<\/p>\n<p>In\u017einieri pou\u017e\u00edvaj\u00fa na v\u00fdpo\u010det Youngovho modulu nieko\u013eko sk\u00fa\u0161obn\u00fdch pr\u00edstrojov. Najprv zmeraj\u00fa r\u00f4zne priemery materi\u00e1lu a od\u010d\u00edtaj\u00fa hodnoty vo viacer\u00fdch bodoch, aby stanovili presn\u00fa z\u00e1kladn\u00fa hodnotu, ktor\u00e1 sa pou\u017eije na \u010fal\u0161ie v\u00fdpo\u010dty. \u010ealej testovanie deform\u00e1cie umo\u017e\u0148uje in\u017einierom zisti\u0165, ako r\u00f4zne sily ovplyv\u0148uj\u00fa reakciu materi\u00e1lu za r\u00f4znych okolnost\u00ed.<\/p>\n<p>Po vyhodnoten\u00ed svojich zisten\u00ed in\u017einieri vypo\u010d\u00edtaj\u00fa Youngov modul materi\u00e1lu porovnan\u00edm jeho hodn\u00f4t so \u0161tandardn\u00fdmi referen\u010dn\u00fdmi hodnotami. Toto ur\u010denie uk\u00e1\u017ee, \u010di jeho schopnos\u0165 absorbova\u0165 nap\u00e4tie dok\u00e1\u017ee odola\u0165 norm\u00e1lnemu nam\u00e1haniu, alebo \u010di jeho krehkos\u0165 vylu\u010duje pou\u017eitie v kon\u0161truk\u010dn\u00fdch aplik\u00e1ci\u00e1ch.<\/p>\n<p>Youngov modul oxidu hlinit\u00e9ho z\u00e1vis\u00ed od viacer\u00fdch premenn\u00fdch vr\u00e1tane teploty, zlo\u017eenia zliatiny a kry\u0161t\u00e1lovej \u0161trukt\u00fary. Vo v\u0161eobecnosti sa vyjadruje ako funkcia deform\u00e1cie, ktor\u00e1 na\u0148 p\u00f4sob\u00ed; konkr\u00e9tne frac LL0\/frac EE(LL)2.<\/p>\n<p>Hlin\u00edk a zirk\u00f3n s\u00fa materi\u00e1ly \u0161iroko pou\u017e\u00edvan\u00e9 v leteckom, automobilovom a priemyselnom priemysle v\u010faka svojej pevnosti, trvanlivosti, vysokej teplotnej tolerancii a odolnosti vo\u010di kor\u00f3zii a oderu.<\/p>\n<p>Hlin\u00edk sa vyzna\u010duje silnou i\u00f3novou v\u00e4zbou medzi svojimi at\u00f3mami, v\u010faka \u010domu m\u00e1 \u017eiaduce vlastnosti materi\u00e1lu. Hoci pri zv\u00fd\u0161en\u00fdch teplot\u00e1ch existuje viacero kry\u0161t\u00e1lov\u00fdch f\u00e1z, v\u00e4\u010d\u0161ina z nich pomerne r\u00fdchlo prech\u00e1dza do hexagon\u00e1lnej alfa f\u00e1zy, \u010do vedie k vzniku pevn\u00e9ho a tuh\u00e9ho keramick\u00e9ho materi\u00e1lu, ktor\u00fd sa \u010dasto pou\u017e\u00edva v kon\u0161truk\u010dn\u00fdch aplik\u00e1ci\u00e1ch.<\/p>\n<p>Modul pru\u017enosti oxidu hlinit\u00e9ho je pribli\u017ene 69 gigapascalov (GPa). T\u00e1to hodnota bola overen\u00e1 experiment\u00e1lnymi meraniami, teoretick\u00fdmi v\u00fdpo\u010dtami a simul\u00e1ciami; jeho presn\u00e1 hodnota sa v\u0161ak m\u00f4\u017ee l\u00ed\u0161i\u0165 v z\u00e1vislosti od sp\u00f4sobu spracovania a v\u00fdroby.<\/p>\n<h2>P\u00f3rovitos\u0165<\/h2>\n<p>Hlin\u00edkov\u00e1 keramika je v\u0161estrann\u00e1 technick\u00e1 keramika s vynikaj\u00facou odolnos\u0165ou proti kor\u00f3zii a opotrebovaniu, vynikaj\u00facou mechanickou pevnos\u0165ou a odol\u00e1va n\u00e1ro\u010dn\u00fdm podmienkam od zemn\u00fdch pr\u00e1c a aplik\u00e1ci\u00ed na prenos materi\u00e1lu a\u017e po vysokoteplotn\u00e9 pece a pece. Hlin\u00edkov\u00e1 keramika pou\u017e\u00edvan\u00e1 v t\u00fdchto prostrediach zvy\u010dajne vykazuje prisp\u00f4soben\u00e9 mikro\u0161trukt\u00fary a zlo\u017eenie prisp\u00f4soben\u00e9 \u0161peci\u00e1lne pre dan\u00fa \u00falohu - v\u010faka t\u00fdmto vlastnostiam je hlin\u00edkov\u00e1 keramika preferovan\u00fdm rie\u0161en\u00edm pre mnoh\u00e9 n\u00e1ro\u010dn\u00e9 aplik\u00e1cie.<\/p>\n<p>P\u00f3rotvorn\u00e9 \u010dinidl\u00e1 pou\u017e\u00edvan\u00e9 pri v\u00fdrobe keramiky z oxidu hlinit\u00e9ho m\u00f4\u017eu ma\u0165 obrovsk\u00fd vplyv na jej tepeln\u00e9 spr\u00e1vanie, napr\u00edklad typy \u0161krobu pou\u017e\u00edvan\u00e9 na tvorbu. V\u00fdsledky tejto \u0161t\u00fadie nazna\u010duj\u00fa, \u017ee tieto materi\u00e1ly vykazuj\u00fa pri v\u00fdrobe zo zemiakov\u00e9ho, p\u0161eni\u010dn\u00e9ho a kukuri\u010dn\u00e9ho \u0161krobu r\u00f4zne \u00farovne p\u00f3rovitosti a ve\u013ekosti p\u00f3rov - pri\u010dom ka\u017ed\u00fd pr\u00e1\u0161ok m\u00e1 aj r\u00f4znu hustotu, ktor\u00e1 ovplyv\u0148uje tepeln\u00fa vodivos\u0165.<\/p>\n<p>S cie\u013eom presk\u00fama\u0165 vplyv p\u00f3rotvorn\u00e9ho \u010dinidla na tepeln\u00e9 vlastnosti oxidu hlinit\u00e9ho cte sa pripravili tri povlaky s pou\u017eit\u00edm r\u00f4znych pr\u00e1\u0161kov a parametrov n\u00e1streku, aby sa presk\u00famal jeho vplyv na tepelnoizola\u010dn\u00e9 vlastnosti. Nastriekan\u00e9 vzorky sa potom podrobili tepelnoizola\u010dn\u00fdm testom, ktor\u00e9 odhalili, \u017ee povlaky s hrub\u00fdmi a stredn\u00fdmi \u010dasticami vykazovali ni\u017e\u0161iu tepeln\u00fa izol\u00e1ciu ako povlaky s jemn\u00fdmi \u010dasticami; navy\u0161e tieto keramick\u00e9 materi\u00e1ly vyroben\u00e9 z hrub\u00fdch a stredn\u00fdch pr\u00e1\u0161kov mali viac neroztaven\u00fdch \u010dast\u00edc a nepravideln\u00e9 rozlo\u017eenie ve\u013ekosti p\u00f3rov ako ich n\u00e1protivky s jemn\u00fdmi \u010dasticami.<\/p>\n<p>Tieto v\u00fdsledky dokazuj\u00fa, \u017ee p\u00f3rotvorn\u00e9 \u010dinidl\u00e1 a ve\u013ekos\u0165 \u010dast\u00edc v\u00fdchodiskov\u00e9ho pr\u00e1\u0161ku zohr\u00e1vaj\u00fa v\u00fdznamn\u00fa \u00falohu pri charakteriz\u00e1cii por\u00e9znej keramiky z oxidu hlinit\u00e9ho, preto\u017ee ich ve\u013ekos\u0165, tvar a distrib\u00facia zohr\u00e1vaj\u00fa neoddelite\u013en\u00fa \u00falohu pri tepeln\u00fdch vlastnostiach povlaku, ako s\u00fa izola\u010dn\u00e9 vlastnosti.<\/p>\n<p>Hodnotili sme nielen l\u00e1tky vytv\u00e1raj\u00face p\u00f3ry a ve\u013ekosti \u010dast\u00edc, ale pou\u017eili sme aj r\u00f6ntgenov\u00fa pr\u00e1\u0161kov\u00fa difrakciu na anal\u00fdzu morfol\u00f3gie 3D \u0161trukt\u00fary AAO. V\u00fdsledky r\u00f6ntgenovej anal\u00fdzy potvrdili existenciu pozd\u013a\u017enych p\u00f3rov v 3D membr\u00e1nach z oxidu hlinit\u00e9ho, ako aj prie\u010dnych nanokan\u00e1likov; ich d\u013a\u017eka ovplyv\u0148uje tepeln\u00fa vodivos\u0165, ako aj pou\u017eit\u00fd materi\u00e1l plniva.<\/p>\n<h2>Hustota<\/h2>\n<p>Oxid hlinit\u00fd je modern\u00fd technick\u00fd keramick\u00fd materi\u00e1l, ktor\u00fd sa be\u017ene pou\u017e\u00edva v r\u00f4znych priemyseln\u00fdch zariadeniach. M\u00f4\u017ee sa pochv\u00e1li\u0165 vynikaj\u00facimi mechanick\u00fdmi a elektrick\u00fdmi vlastnos\u0165ami, v\u010faka \u010domu je vhodn\u00fd na presn\u00e9 tesniace aplik\u00e1cie v prostred\u00ed s vysok\u00fdmi teplotami, ako aj na vynikaj\u00face izola\u010dn\u00e9 vlastnosti v\u010faka extr\u00e9mne n\u00edzkej p\u00f3rovitosti a ve\u013ekej ve\u013ekosti z\u0155n. Hlin\u00edk je chemicky inertn\u00fd a odoln\u00fd vo\u010di kor\u00f3zii.<\/p>\n<p>Medzi mechanick\u00e9 vlastnosti oxidu hlinit\u00e9ho patr\u00ed aj jeho odolnos\u0165 proti oderu, tvrdos\u0165 a pevnos\u0165 v ohybe - \u010dasto presahuj\u00faca 160 MPa v \u0165ahu a 280 MPa v ohybe - stanoven\u00e1 testovan\u00edm za stanoven\u00fdch podmienok. Pevnos\u0165 v ohybe meria schopnos\u0165 materi\u00e1lu deformova\u0165 sa pri za\u0165a\u017een\u00ed; na presn\u00e9 pos\u00fadenie t\u00fdchto vlastnost\u00ed sa pevnos\u0165 v \u0165ahu a pevnos\u0165 v ohybe meria priamym p\u00f4soben\u00edm nap\u00e4tia a meran\u00edm deform\u00e1cie v mieste poru\u0161enia.<\/p>\n<p>Fyzik\u00e1lne vlastnosti oxidu hlinit\u00e9ho sa m\u00f4\u017eu l\u00ed\u0161i\u0165 v z\u00e1vislosti od jeho \u010distoty a v\u00fdrobn\u00e9ho procesu. Reakt\u00edvny oxid hlinit\u00fd m\u00e1 ni\u017e\u0161iu teplotu topenia a vy\u0161\u0161iu hustotu ako be\u017en\u00fd oxid hlinit\u00fd a tento rozdiel m\u00f4\u017ee v\u00fdznamne ovplyvni\u0165 v\u00fdrobu, procesy pou\u017e\u00edvania, ako aj v\u00fdkonnos\u0165 v\u00fdrobku.<\/p>\n<p>Jemnozrnn\u00fd technick\u00fd oxid hlinit\u00fd je jedn\u00fdm z \u0165a\u017en\u00fdch kon\u00ed priemyslu a poskytuje atrakt\u00edvnu rovnov\u00e1hu medzi n\u00e1kladmi a v\u00fdkonom. Dostupn\u00e9 \u00farovne \u010distoty sa pohybuj\u00fa od 94% pre aplik\u00e1cie s jednoduchou metaliz\u00e1ciou a\u017e po 99,8%, ktor\u00e9 sp\u013a\u0148aj\u00fa po\u017eiadavky aj n\u00e1ro\u010dn\u00fdch aplik\u00e1ci\u00ed.<\/p>\n<p>Keramick\u00fd materi\u00e1l v zelenom alebo pi\u0161k\u00f3tovom stave sa d\u00e1 \u013eahko opracova\u0165 do zlo\u017eit\u00fdch geometrick\u00fdch tvarov. Bohu\u017eia\u013e, proces spekania potrebn\u00fd na jeho \u00fapln\u00e9 zhutnenie sp\u00f4sobuje jeho zmr\u0161tenie pribli\u017ene o 20%; v d\u00f4sledku toho si dosiahnutie tesn\u00fdch toleranci\u00ed vy\u017eaduje presn\u00e9 obr\u00e1banie pomocou diamantov\u00fdch br\u00fasnych techn\u00edk, ktor\u00e9 m\u00f4\u017ee by\u0165 \u010dasovo aj finan\u010dne n\u00e1ro\u010dn\u00e9.<\/p>\n<p>Obr\u00e1bate\u013en\u00e1 sklokeramika Macor m\u00f4\u017ee predstavova\u0165 cenovo v\u00fdhodn\u00fa alternat\u00edvu, ke\u010f v\u00fdkonnos\u0165 oxidu hlinit\u00e9ho nie je prvorad\u00e1. Macor m\u00e1 porovnate\u013en\u00fa pevnos\u0165 v ohybe a tepeln\u00fa vodivos\u0165, ale s v\u00e4\u010d\u0161ou ve\u013ekos\u0165ou z\u0155n; preto m\u00f4\u017ee pon\u00faka\u0165 men\u0161iu odolnos\u0165 proti oderu a slab\u0161ie fungova\u0165 v prostrediach, v ktor\u00fdch doch\u00e1dza k r\u00fdchlym cyklom zahrievania\/ochladzovania.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-187\" src=\"https:\/\/aluminaceramics.net\/wp-content\/uploads\/2024\/05\/what-is-alumina-cte.jpg\" alt=\"\u010co je oxid hlinit\u00fd cte\" width=\"750\" height=\"750\" srcset=\"https:\/\/aluminaceramics.net\/wp-content\/uploads\/2024\/05\/what-is-alumina-cte.jpg 750w, https:\/\/aluminaceramics.net\/wp-content\/uploads\/2024\/05\/what-is-alumina-cte-300x300.jpg 300w, https:\/\/aluminaceramics.net\/wp-content\/uploads\/2024\/05\/what-is-alumina-cte-150x150.jpg 150w, https:\/\/aluminaceramics.net\/wp-content\/uploads\/2024\/05\/what-is-alumina-cte-12x12.jpg 12w\" sizes=\"auto, (max-width: 750px) 100vw, 750px\" \/><\/p>","protected":false},"excerpt":{"rendered":"<p>Alumina cte is an advanced refractory material with superior adhesiveness that can be easily formed into near net shapes using 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