{"id":106,"date":"2024-06-10T04:31:17","date_gmt":"2024-06-09T20:31:17","guid":{"rendered":"https:\/\/aluminaceramics.net\/?p=106"},"modified":"2024-07-15T20:12:21","modified_gmt":"2024-07-15T12:12:21","slug":"vyhody-kotouce-z-oxidu-hliniteho","status":"publish","type":"post","link":"https:\/\/aluminaceramics.net\/cs\/the-benefits-of-alumina-disc\/","title":{"rendered":"V\u00fdhody hlin\u00edkov\u00e9ho disku"},"content":{"rendered":"<p>Hlin\u00edkov\u00fd kotou\u010d je keramick\u00e1 sou\u010d\u00e1stka ve tvaru kotou\u010de vyroben\u00e1 z univerz\u00e1ln\u00edho materi\u00e1lu oxidu hlinit\u00e9ho. Poskytuje \u0159adu v\u00fdhod.<\/p>\n<p>Silikonov\u00e1 pry\u017e je schopna odol\u00e1vat vysok\u00fdm teplot\u00e1m a mechanick\u00e9mu nam\u00e1h\u00e1n\u00ed a d\u00edky sv\u00e9 mechanick\u00e9 pevnosti je odoln\u00fdm materi\u00e1lem. Krom\u011b toho se vyzna\u010duje vynikaj\u00edc\u00edmi elektroizola\u010dn\u00edmi vlastnostmi, co\u017e z n\u011bj \u010din\u00ed vynikaj\u00edc\u00ed volbu pro pou\u017eit\u00ed ve filtra\u010dn\u00edch, katalytick\u00fdch a senzorov\u00fdch technologi\u00edch.<\/p>\n<h2>Odolnost proti vysok\u00fdm teplot\u00e1m<\/h2>\n<p>Keramick\u00e9 desky a kotou\u010de z oxidu hlinit\u00e9ho odol\u00e1vaj\u00ed vysok\u00fdm teplot\u00e1m a z\u00e1rove\u0148 jsou vysoce odoln\u00e9. V\u00fdrobky z oxidu hlinit\u00e9ho (Al2O3) se \u010dasto pou\u017e\u00edvaj\u00ed v aplikac\u00edch vy\u017eaduj\u00edc\u00edch mechanickou odolnost a tak\u00e9 jako elektrick\u00e9 izol\u00e1tory p\u0159i zv\u00fd\u0161en\u00fdch teplot\u00e1ch, v\u010detn\u011b rezistor\u016f a tranzistor\u016f pracuj\u00edc\u00edch pod nap\u011bt\u00edm. Hlin\u00edk m\u00e1 vysok\u00fd bod t\u00e1n\u00ed s vynikaj\u00edc\u00edmi vlastnostmi tepeln\u00e9 stability. Jeho tvarovatelnost nav\u00edc umo\u017e\u0148uje splnit specifick\u00e1 konstruk\u010dn\u00ed a v\u00fdkonnostn\u00ed krit\u00e9ria.<\/p>\n<p>Hlin\u00edk je vysoce odoln\u00fd v\u016f\u010di kyselin\u00e1m a louh\u016fm a odol\u00e1v\u00e1 vysok\u00fdm teplot\u00e1m po del\u0161\u00ed dobu, ani\u017e by do\u0161lo k jeho degradaci - tyto vlastnosti ho p\u0159edur\u010duj\u00ed k pou\u017eit\u00ed p\u0159i zpracov\u00e1n\u00ed chemik\u00e1li\u00ed, v\u00fdrob\u011b l\u00e9ka\u0159sk\u00fdch p\u0159\u00edstroj\u016f, keramiky a pokro\u010dil\u00fdch materi\u00e1l\u016f, v\u00fdrob\u011b optick\u00fdch sou\u010d\u00e1stek a v aplikac\u00edch zam\u011b\u0159en\u00fdch na biokompatibilitu.<\/p>\n<p>Hlin\u00edk odol\u00e1v\u00e1 teplu, ani\u017e by se deformoval, a z\u00e1rove\u0148 z\u016fst\u00e1v\u00e1 rozm\u011brov\u011b stabiln\u00ed i p\u0159i vysok\u00fdch teplot\u00e1ch, co\u017e mu umo\u017e\u0148uje odol\u00e1vat mechanick\u00e9mu zat\u00ed\u017een\u00ed bez deformace nebo poruchy. Jeho elektroizola\u010dn\u00ed vlastnosti nav\u00edc zabra\u0148uj\u00ed p\u0159eh\u0159\u00e1t\u00ed citliv\u00fdch obvod\u016f v podm\u00ednk\u00e1ch nadm\u011brn\u00e9 teploty, \u010d\u00edm\u017e zaru\u010duj\u00ed spolehliv\u00fd provoz za\u0159\u00edzen\u00ed.<\/p>\n<p>Hlin\u00edk je vysoce inertn\u00ed a nereaktivn\u00ed, tak\u017ee je ide\u00e1ln\u00edm materi\u00e1lem pro pou\u017eit\u00ed v laborato\u0159\u00edch pro podporu a skladov\u00e1n\u00ed vysokoteplotn\u00edch experiment\u016f a v\u00fdzkumn\u00fdch za\u0159\u00edzen\u00ed, jako jsou kel\u00edmky. Desky a disky z oxidu hlinit\u00e9ho tak\u00e9 slou\u017e\u00ed jako ned\u00edln\u00e1 sou\u010d\u00e1st p\u0159i p\u0159\u00edprav\u011b vzork\u016f k anal\u00fdze a p\u0159i r\u016fzn\u00fdch charakteriza\u010dn\u00edch technik\u00e1ch. Studie inhalace radioaktivn\u011b zna\u010den\u00e9ho 26Al prok\u00e1zaly, \u017ee v\u011bt\u0161ina tohoto oxidu hlinit\u00e9ho se rychle vy\u010dist\u00ed z plicn\u00ed tk\u00e1n\u011b a pouze mal\u00e9 mno\u017estv\u00ed z\u016fstane pro dlouhodobou sekvestraci.<\/p>\n<h2>Vysokopevnostn\u00ed<\/h2>\n<p>Kotou\u010de z oxidu hlinit\u00e9ho jsou ploch\u00e9 keramick\u00e9 desky strojov\u011b \u0159ezan\u00e9 do kruhov\u00fdch tvar\u016f. Jejich velikost a tlou\u0161\u0165ka z\u00e1vis\u00ed na konkr\u00e9tn\u00ed aplikaci, pro kterou jsou ur\u010deny; jsou vyrobeny z Al2O3, kter\u00fd se vyzna\u010duje dobrou mechanickou pevnost\u00ed a odolnost\u00ed proti opot\u0159eben\u00ed a z\u00e1rove\u0148 je elektricky a tepeln\u011b izoluj\u00edc\u00ed; tyto disky lze vyrobit pro r\u016fzn\u00e1 pou\u017eit\u00ed, jako je filtrace, separace kapalin, katal\u00fdza nebo senzorov\u00e9 technologie; nav\u00edc mohou b\u00fdt dokonce por\u00e9zn\u00ed, aby vyhovovaly pot\u0159eb\u00e1m biomedic\u00ednsk\u00fdch aplikac\u00ed, a to p\u0159izp\u016fsoben\u00edm rozlo\u017een\u00ed velikosti p\u00f3r\u016f a parametr\u016f celkov\u00e9 propustnosti - co\u017e z nich \u010din\u00ed ide\u00e1ln\u00ed materi\u00e1l.<\/p>\n<p>Keramick\u00fd materi\u00e1l z oxidu hlinit\u00e9ho se vyzna\u010duje vysokou tvrdost\u00ed a hou\u017eevnatost\u00ed, tak\u017ee \u00fa\u010dinn\u011b odol\u00e1v\u00e1 n\u00e1raz\u016fm a od\u011bru. Krom\u011b toho jsou tyto desky chemicky inertn\u00ed, co\u017e znamen\u00e1, \u017ee nereaguj\u00ed s kyselinami a louhy, a jsou tak\u00e9 teplotn\u011b odoln\u00e9 a schopn\u00e9 odol\u00e1vat r\u016fzn\u00fdm teplot\u00e1m. A kone\u010dn\u011b, d\u00edky sv\u00e9 schopnosti absorbovat n\u00e1razy a vibrace jsou ide\u00e1ln\u00ed pro pou\u017eit\u00ed v mechanick\u00fdch za\u0159\u00edzen\u00edch, kter\u00e1 pot\u0159ebuj\u00ed ochranu p\u0159ed od\u011brem.<\/p>\n<p>Zirkonem tvrzen\u00e1 keramika z oxidu hlinit\u00e9ho poskytuje podobn\u00fd v\u00fdkon za v\u00fdhodn\u011bj\u0161\u00ed cenu a m\u016f\u017ee se pochlubit vynikaj\u00edc\u00ed pevnost\u00ed v ohybu a lomovou hou\u017eevnatost\u00ed p\u0159i b\u011b\u017en\u00fdch teplot\u00e1ch s r\u016fzn\u00fdmi pom\u011bry zirkonu pro pot\u0159eby z\u00e1kazn\u00edk\u016f.<\/p>\n<p>Keramick\u00e9 kotou\u010de z oxidu hlinit\u00e9ho jsou ide\u00e1ln\u00ed pro brou\u0161en\u00ed a le\u0161t\u011bn\u00ed tvrd\u00fdch \u017eelezn\u00fdch kov\u016f a slitin na automatick\u00fdch nebo vysokorychlostn\u00edch ru\u010dn\u00edch brusk\u00e1ch, ani\u017e by vytv\u00e1\u0159ely nadm\u011brn\u00e9 teplo nebo hrub\u00fd povrch. Krom\u011b toho lze tyto kotou\u010de pou\u017e\u00edvat tak\u00e9 v procesech mokr\u00e9ho \u010di\u0161t\u011bn\u00ed, jako je myt\u00ed kyselinou a steriliza\u010dn\u00ed procesy, a jsou tak\u00e9 skv\u011blou volbou pro brou\u0161en\u00ed k odstran\u011bn\u00ed \u0161kr\u00e1banc\u016f a oxidace na kovov\u00fdch povr\u0161\u00edch.<\/p>\n<h2>Chemick\u00e1 inertnost<\/h2>\n<p>Hlin\u00edkov\u00e1 keramika m\u00e1 chemickou inertnost, tak\u017ee je odoln\u00e1 v\u016f\u010di mnoha typ\u016fm kapaln\u00fdch a plynn\u00fdch chemik\u00e1li\u00ed, kter\u00e9 by ji mohly napadnout. D\u00edky tomu jsou vhodn\u00e9 pro chemickou anal\u00fdzu a v\u00fdrobn\u00ed aplikace a tak\u00e9 jako \u00fa\u010dinn\u00e1 bari\u00e9ra proti kontaminaci obalov\u00fdch materi\u00e1l\u016f pou\u017e\u00edvan\u00fdch p\u0159i v\u00fdrob\u011b potravin.<\/p>\n<p>Chemicky inertn\u00ed materi\u00e1ly vy\u017eaduj\u00ed, aby nereagovaly s jin\u00fdmi slou\u010deninami; to znamen\u00e1, \u017ee maj\u00ed pln\u00fd vn\u011bj\u0161\u00ed elektronov\u00fd obal a nemaj\u00ed tendenci z\u00edsk\u00e1vat nebo ztr\u00e1cet elektrony. P\u00edsek (SiO2) a vz\u00e1cn\u00e9 plyny, jako je helium a neon, jsou p\u0159\u00edklady materi\u00e1l\u016f, kter\u00e9 maj\u00ed \u00fapln\u00fd vn\u011bj\u0161\u00ed elektronov\u00fd obal, ani\u017e by \u010dasem ztr\u00e1cely nebo z\u00edsk\u00e1valy elektrony; naproti tomu atom\u00e1rn\u00ed chlor a kyselina s\u00edrov\u00e1 snadno vytv\u00e1\u0159ej\u00ed vazby s jin\u00fdmi l\u00e1tkami, \u010d\u00edm\u017e se st\u00e1vaj\u00ed chemicky reaktivn\u00edmi.<\/p>\n<p>Chemick\u00e1 inertnost je d\u016fle\u017eit\u00fdm faktorem p\u0159i v\u00fdb\u011bru n\u00e1dob na nebezpe\u010dn\u00e9 chemick\u00e9 l\u00e1tky a dal\u0161\u00ed produkty, aby byla zaji\u0161t\u011bna bezpe\u010dn\u00e1 manipulace bez \u00faniku nebo rozlit\u00ed p\u0159i zat\u0159esen\u00ed nebo p\u00e1du. Chemicky inertn\u00ed n\u00e1doby hraj\u00ed tak\u00e9 ned\u00edlnou roli v mnoha chemick\u00fdch procesech, jako je destilace a su\u0161en\u00ed.<\/p>\n<p>Kotou\u010de z oxidu hlinit\u00e9ho maj\u00ed vynikaj\u00edc\u00ed chemickou inertnost a odolnost proti tepeln\u00e9mu nam\u00e1h\u00e1n\u00ed, co\u017e je p\u0159edur\u010duje k pou\u017eit\u00ed p\u0159i vysok\u00fdch teplot\u00e1ch a tepeln\u00e9m nam\u00e1h\u00e1n\u00ed. D\u00edky tomu jsou hlin\u00edkov\u00e9 kotou\u010de ide\u00e1ln\u00ed pro pou\u017eit\u00ed v procesech vy\u017eaduj\u00edc\u00edch zm\u00edrn\u011bn\u00ed tepeln\u00e9ho nam\u00e1h\u00e1n\u00ed.<\/p>\n<p>Kotou\u010de z oxidu hlinit\u00e9ho jsou vynikaj\u00edc\u00edmi elektrick\u00fdmi izol\u00e1tory, tak\u017ee jsou vhodn\u00e9 pro pou\u017eit\u00ed v elektronick\u00fdch za\u0159\u00edzen\u00edch a dal\u0161\u00edch aplikac\u00edch, kter\u00e9 vy\u017eaduj\u00ed izolaci. Krom\u011b toho jsou d\u00edky sv\u00e9 vysok\u00e9 odolnosti proti korozi a ot\u011bru vhodn\u00e9 i pro aplikace odoln\u00e9 proti opot\u0159eben\u00ed. Jejich por\u00e9zn\u00ed struktura nav\u00edc zvy\u0161uje katalytick\u00e9 reakce t\u00edm, \u017ee zv\u011bt\u0161uje povrch.<\/p>\n<h2>Odolnost proti korozi<\/h2>\n<p>Korozn\u00ed odolnost kov\u016f ozna\u010duje jejich schopnost odol\u00e1vat po\u0161kozen\u00ed vlivem prost\u0159ed\u00ed a chemick\u00e9mu rozkladu, nej\u010dast\u011bji koroz\u00ed v r\u016fzn\u00fdch form\u00e1ch - od rzi po d\u016flkovou korozi, kavitaci a zad\u00edr\u00e1n\u00ed - kter\u00e1 \u010dasem zp\u016fsobuje korozi kovov\u00fdch povrch\u016f. Koroze m\u016f\u017ee po\u0161kodit kovy do t\u00e9 m\u00edry, \u017ee se stanou nefunk\u010dn\u00edmi nebo dokonce zcela nefunk\u010dn\u00edmi a tak\u00e9 se prodra\u017e\u00ed jejich opravy nebo v\u00fdm\u011bna. Existuj\u00ed r\u016fzn\u00e9 techniky pro zlep\u0161en\u00ed odolnosti proti korozi, jako je nap\u0159\u00edklad potahov\u00e1n\u00ed materi\u00e1l\u016f inhibitory koroze nebo aplikace antikorozn\u00edch \u00faprav; \u017e\u00e1dn\u00fd kov nenab\u00edz\u00ed v\u0161estrannou ochranu p\u0159ed po\u0161kozen\u00edm zp\u016fsoben\u00fdm koroz\u00ed; mnoho slitin v\u0161ak poskytuje skv\u011blou ochranu p\u0159ed v\u0161emi prost\u0159ed\u00edmi.<\/p>\n<p>Por\u00e9zn\u00ed keramick\u00e9 kotou\u010de z oxidu hlinit\u00e9ho (Al2O3) se pou\u017e\u00edvaj\u00ed v r\u016fzn\u00fdch pr\u016fmyslov\u00fdch za\u0159\u00edzen\u00edch pro r\u016fzn\u00e9 aplikace. Mezi jejich p\u0159ednosti pat\u0159\u00ed tvrdost, odolnost proti opot\u0159eben\u00ed a korozi, tepeln\u00e1 vodivost a elektroizola\u010dn\u00ed vlastnosti - tyto vlastnosti umo\u017e\u0148uj\u00ed p\u0159izp\u016fsobit jejich p\u00f3rovitost podle konkr\u00e9tn\u00edch pot\u0159eb aplikace a s ohledem na \u017eivotn\u00ed prost\u0159ed\u00ed.<\/p>\n<p>Hlin\u00edkov\u00e1 keramika se pou\u017e\u00edv\u00e1 jako tepeln\u00fd izol\u00e1tor v prost\u0159ed\u00ed s vysok\u00fdmi teplotami, jako jsou pece a su\u0161\u00e1rny, a jako mechanick\u00e9 sou\u010d\u00e1sti, nap\u0159\u00edklad lo\u017eiska a t\u011bsn\u011bn\u00ed, kter\u00e9 sni\u017euj\u00ed t\u0159en\u00ed a prodlu\u017euj\u00ed \u017eivotnost syst\u00e9mu; nav\u00edc m\u016f\u017ee slou\u017eit jako substr\u00e1t pro procesy nan\u00e1\u0161en\u00ed tenk\u00fdch vrstev.<\/p>\n<p>D\u00edky odolnosti proti korozi je hlin\u00edkov\u00e1 keramika obzvl\u00e1\u0161t\u011b cenn\u00e1 v laboratorn\u00edm vybaven\u00ed, v\u010detn\u011b kel\u00edmk\u016f a vani\u010dek pou\u017e\u00edvan\u00fdch pro vysokoteplotn\u00ed p\u0159\u00edpravu a anal\u00fdzu vzork\u016f, supravodi\u010d\u016f, keramiky, l\u00e9ka\u0159sk\u00fdch a zubn\u00edch p\u0159\u00edstroj\u016f, proto\u017ee je biokompatibiln\u00ed, odoln\u00e1 proti chemik\u00e1li\u00edm a opot\u0159eben\u00ed, biokompatibiln\u00ed a dostate\u010dn\u011b odoln\u00e1 pro korozivn\u00ed prost\u0159ed\u00ed.<\/p>\n<h2>Odolnost proti opot\u0159eben\u00ed<\/h2>\n<p>Keramick\u00e9 kotou\u010de z oxidu hlinit\u00e9ho maj\u00ed vynikaj\u00edc\u00ed odolnost proti n\u00e1razov\u00e9mu opot\u0159eben\u00ed a erozivn\u00ed erozi. D\u00edky sv\u00e9 chemick\u00e9 inertnosti jsou vhodn\u00e9 pro aplikace vy\u017eaduj\u00edc\u00ed mechanickou pevnost, odolnost proti korozi a elektrickou izolaci; nav\u00edc maj\u00ed vynikaj\u00edc\u00ed tepeln\u011b stabiln\u00ed vlastnosti.<\/p>\n<p>Hlin\u00edk se m\u016f\u017ee pochlubit vy\u0161\u0161\u00ed tvrdost\u00ed ne\u017e zirkon, co\u017e z n\u011bj \u010din\u00ed lep\u0161\u00ed volbu v prost\u0159ed\u00ed s kluzn\u00fdm opot\u0159eben\u00edm, kde se protilehl\u00e9 plochy p\u0159\u00edmo nest\u00fdkaj\u00ed. V \u010dist\u011b abrazivn\u00edch nebo sm\u00ed\u0161en\u00fdch prost\u0159ed\u00edch, kde doch\u00e1z\u00ed sou\u010dasn\u011b ke kluzn\u00e9mu opot\u0159eben\u00ed i k abrazivn\u00edmu opot\u0159eben\u00ed t\u0159et\u00edho t\u011blesa, v\u0161ak m\u016f\u017ee m\u00edt zirkon v ur\u010dit\u00fdch situac\u00edch lep\u0161\u00ed vlastnosti ne\u017e oxid hlinit\u00fd.<\/p>\n<p>V porovn\u00e1n\u00ed s oxidem hlinit\u00fdm nab\u00edz\u00ed zirkonium vy\u0161\u0161\u00ed odolnost proti \u00fanav\u011b d\u00edky absenci mechanism\u016f k\u0159ehk\u00e9ho selh\u00e1n\u00ed a m\u00e1 ni\u017e\u0161\u00ed hustotu ne\u017e ocel nebo nerezov\u00e1 ocel, co\u017e pom\u00e1h\u00e1 sn\u00ed\u017eit zat\u00ed\u017een\u00ed za\u0159\u00edzen\u00ed a prodlou\u017eit \u017eivotnost.<\/p>\n<p>P\u0159i zkou\u0161k\u00e1ch pomoc\u00ed kol\u00ed\u010dk\u016f na kotou\u010di se pou\u017e\u00edv\u00e1 kulov\u00fd indentor, kter\u00fd tla\u010d\u00ed na povrch vzorku a vytv\u00e1\u0159\u00ed stopu opot\u0159eben\u00ed. Toto m\u011b\u0159en\u00ed poskytuje p\u0159ehled o odolnosti povlaku proti ot\u011bru, mazivosti a adhezivn\u00edch vlastnostech; oxid hlinit\u00fd vynik\u00e1 zejm\u00e9na svou vysokou tvrdost\u00ed a pevnost\u00ed jako vynikaj\u00edc\u00ed materi\u00e1l pro ot\u011br, zat\u00edmco jeho n\u00edzk\u00fd koeficient t\u0159en\u00ed zaji\u0161\u0165uje vynikaj\u00edc\u00ed mazac\u00ed vlastnosti.<\/p>\n<p>Hlin\u00edkov\u00e1 keramika je dob\u0159e zn\u00e1m\u00e1 pro svou odolnost proti ot\u011bru, p\u0159i\u010dem\u017e n\u011bkolik druh\u016f vykazuje v t\u00e9to aplikaci vynikaj\u00edc\u00ed v\u00fdsledky. C\u00edlem t\u00e9to studie je zjistit, jak\u00fd vliv m\u00e1 slo\u017een\u00ed a velikost zrn na v\u00fdkon kompozitn\u00edch materi\u00e1l\u016f oxidu hlinit\u00e9ho a zirkoni\u010dit\u00e9ho (Al2O3+ZnO) proti korundov\u00fdm a ocelov\u00fdm kuli\u010dkov\u00fdm brusiv\u016fm; testov\u00e1ny jsou tak\u00e9 in-situ vytvo\u0159en\u00e9 koncentrace tvrd\u00e9 boritanov\u00e9 f\u00e1ze hlin\u00edku, kter\u00e9 vytv\u00e1\u0159ej\u00ed stopy opot\u0159eben\u00ed podobn\u00e9 SEM mikrofotografi\u00edm vytvo\u0159en\u00fdm kompozity A10, A20 a B20 proti korundov\u00fdm i ocelov\u00fdm kuli\u010dkov\u00fdm brusiv\u016fm; jsou prezentov\u00e1ny SEM mikrofotografie a EDS spektra.<\/p>","protected":false},"excerpt":{"rendered":"<p>An Alumina disc is a disc-shaped ceramic component made of the versatile material Alumina (aluminum oxide). It provides numerous advantages. 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