Pr\u00e1\u0161kov\u00fd oxid hlinit\u00fd je nepostradateln\u00fdm j\u00e1drem a plnivem nanokompozit\u016f a slou\u017e\u00ed tak\u00e9 jako d\u016fle\u017eit\u00e1 podp\u016frn\u00e1 slou\u010denina pro pr\u016fmyslov\u00e9 katalyz\u00e1tory. Por\u00e9zn\u00ed saze jsou d\u00edky sv\u00e9 hust\u00e9 konzistenci a schopnosti absorbovat ne\u010distoty ned\u00edlnou sou\u010d\u00e1st\u00ed kosmetick\u00fdch v\u00fdrobk\u016f a slou\u017e\u00ed jako z\u00e1klad korundu, brusiva pou\u017e\u00edvan\u00e9ho k le\u0161t\u011bn\u00ed drah\u00fdch kamen\u016f.<\/p>\n
Pr\u00e1\u0161kov\u00fd oxid hlinit\u00fd vznik\u00e1 kalcinac\u00ed hydroxidu hlinit\u00e9ho p\u0159i vysok\u00fdch teplot\u00e1ch za \u00fa\u010delem odstran\u011bn\u00ed vody a vzniku oxidu hlinit\u00e9ho, kter\u00fd se d\u00e1le zpracov\u00e1v\u00e1 a vyr\u00e1b\u00ed se z n\u011bj r\u016fzn\u00e9 formy s r\u016fzn\u00fdmi vlastnostmi a pou\u017eit\u00edm.<\/p>\n
V z\u00e1vislosti na kvalit\u011b m\u016f\u017ee m\u00edt oxid hlinit\u00fd r\u016fznou strukturu od jemn\u00e9 po hrubou a r\u016fzn\u00e9 \u00farovn\u011b chemick\u00e9 \u010distoty a povrchu. T\u0159\u00eddy s velmi n\u00edzk\u00fdm obsahem ne\u010distot jsou zn\u00e1m\u00e9 jako vysoce \u010dist\u00fd oxid hlinit\u00fd (HPA), zat\u00edmco t\u0159\u00eddy s extr\u00e9mn\u011b velk\u00fdm povrchem jsou zn\u00e1m\u00e9 jako zrnit\u00fd oxid hlinit\u00fd (GA) s ni\u017e\u0161\u00edm stupn\u011bm \u010distoty.<\/p>\n
Jemn\u00fd pr\u00e1\u0161kov\u00fd oxid hlinit\u00fd lze nal\u00e9zt v le\u0161tic\u00edch sm\u011bs\u00edch a materi\u00e1lech na podporu katalyz\u00e1tor\u016f a tak\u00e9 se pou\u017e\u00edv\u00e1 jako plnivo p\u0159i v\u00fdrob\u011b plast\u016f a pry\u017ee. Krom\u011b toho se vysoce \u010dist\u00fd oxid hlinit\u00fd pou\u017e\u00edv\u00e1 p\u0159i v\u00fdrob\u011b saf\u00edrov\u00fdch substr\u00e1t\u016f pro elektronick\u00e1 za\u0159\u00edzen\u00ed a tak\u00e9 se pokovuje pro pou\u017eit\u00ed ve vysokoteplotn\u00edch p\u00e1jec\u00edch sestav\u00e1ch - zkr\u00e1tka m\u00e1 mnohostrann\u00e9 vyu\u017eit\u00ed a funguje jako vynikaj\u00edc\u00ed elektrick\u00fd izolant.<\/p>\n
Hlin\u00edk lze tak\u00e9 pou\u017e\u00edt jako ochrann\u00fd povlak na pr\u016fmyslov\u00e9 v\u00fdrobky a stroje, kter\u00e9 pom\u00e1h\u00e1 chr\u00e1nit p\u0159ed ot\u011brem. D\u00edky sv\u00e9 vynikaj\u00edc\u00ed tvrdosti a pevnosti je oxid hlinit\u00fd ide\u00e1ln\u00edm keramick\u00fdm izol\u00e1torem a substr\u00e1tem, stejn\u011b jako d\u00edky tepeln\u00e9 kapacit\u011b a vysok\u00e9mu bodu t\u00e1n\u00ed je u\u017eite\u010dn\u00fd p\u0159i v\u00fdrob\u011b \u017e\u00e1ruvzdorn\u00fdch v\u00fdrobk\u016f pou\u017e\u00edvan\u00fdch v aplikac\u00edch, jako je petrochemick\u00e9 zpracov\u00e1n\u00ed, v\u00fdroba cementu, spalov\u00e1n\u00ed odpadu a v\u00fdroba \u017eeleza a oceli. Hlin\u00edk m\u016f\u017ee b\u00fdt dokonce sm\u00edch\u00e1n se sklem pro zv\u00fd\u0161en\u00ed pevnosti.<\/p>\n
Pr\u00e1\u0161kov\u00fd oxid hlinit\u00fd se pou\u017e\u00edv\u00e1 p\u0159i v\u00fdrob\u011b \u0161irok\u00e9 \u0161k\u00e1ly pr\u016fmyslov\u00fdch v\u00fdrobk\u016f, jako je keramika, metalurgie, elektronika a v\u00fdroba katalyz\u00e1tor\u016f. D\u00edky sv\u00fdm tepeln\u00fdm, chemick\u00fdm a mechanick\u00fdm vlastnostem je oxid hlinit\u00fd ide\u00e1ln\u00edm materi\u00e1lem pro \u017e\u00e1ruvzdorn\u00e9 materi\u00e1ly, brusn\u00e9 kotou\u010de a aplikace odoln\u00e9 proti opot\u0159eben\u00ed, stejn\u011b jako d\u00edky n\u00edzk\u00e9 \u00farovni t\u0159en\u00ed, kter\u00e1 jej \u010din\u00ed vhodn\u00fdm pro nanokompozity s po\u017eadavky na biokompatibilitu.<\/p>\n
D\u00edky vysok\u00e9mu bodu t\u00e1n\u00ed a tepeln\u00e9 odolnosti se oxid hlinit\u00fd hojn\u011b vyu\u017e\u00edv\u00e1 p\u0159i v\u00fdrob\u011b elektrick\u00fdch za\u0159\u00edzen\u00ed a polovodi\u010d\u016f. Krom\u011b toho se v chladi\u010d\u00edch vyu\u017e\u00edv\u00e1 jako kl\u00ed\u010dov\u00e1 sou\u010d\u00e1st pro odvod tepla vznikaj\u00edc\u00edho v elektronick\u00fdch sou\u010d\u00e1stk\u00e1ch a d\u00edky sv\u00fdm n\u00edzk\u00fdm t\u0159ec\u00edm a izola\u010dn\u00edm vlastnostem je vynikaj\u00edc\u00ed volbou materi\u00e1lu pro vytv\u00e1\u0159en\u00ed antiadh\u00e9zn\u00edch povlak\u016f.<\/p>\n
Kalcinovan\u00fd oxid hlinit\u00fd se v petrochemick\u00e9m pr\u016fmyslu hojn\u011b pou\u017e\u00edv\u00e1 k v\u00fdrob\u011b keramick\u00fdch proppant\u016f, kter\u00e9 se pou\u017e\u00edvaj\u00ed p\u0159i hydraulick\u00e9m \u0161t\u011bpen\u00ed, aby udr\u017eely trhliny otev\u0159en\u00e9 b\u011bhem hydraulick\u00e9ho \u0161t\u011bpen\u00ed (frackingu), a t\u00edm napomohly t\u011b\u017eb\u011b uhlovod\u00edk\u016f z podzemn\u00edch lo\u017eisek.<\/p>\n
\u010cist\u00fd oxid hlinit\u00fd (99%) se \u0161iroce pou\u017e\u00edv\u00e1 k v\u00fdrob\u011b d\u00edl\u016f pro stroje a za\u0159\u00edzen\u00ed, kter\u00e9 mus\u00ed b\u00fdt odoln\u00e9 proti ot\u011bru a z\u00e1rove\u0148 \u00fa\u010dinn\u011b izolovat proti hluku a z\u00e1\u0159en\u00ed. Mezi b\u011b\u017en\u00e9 aplikace tohoto materi\u00e1lu pat\u0159\u00ed h\u0159\u00eddele, lo\u017eiska, axi\u00e1ln\u00ed podlo\u017eky a p\u00edsty u \u010derpadel, kter\u00e1 pracuj\u00ed s chemik\u00e1liemi, a tak\u00e9 laserov\u00e9 komponenty, elektrooptick\u00e1 za\u0159\u00edzen\u00ed, senzory pr\u016ftokom\u011br\u016f a rentgenov\u00e1 za\u0159\u00edzen\u00ed.<\/p>\n
Hlin\u00edk lze p\u0159epravovat n\u00e1kladn\u00edmi automobily nebo p\u0159\u00edv\u011bsy speci\u00e1ln\u011b vybaven\u00fdmi pro p\u0159epravu t\u011b\u017ek\u00fdch n\u00e1klad\u016f, po \u017eeleznici, n\u00e1kladn\u00ed lod\u00ed nebo jak\u00fdmkoli jin\u00fdm zp\u016fsobem ur\u010den\u00fdm pro p\u0159epravu sypk\u00fdch komodit, jako je hlin\u00edk.<\/p>\n
Hlin\u00edk je nepostradateln\u00fdm materi\u00e1lem v mnoha aplikac\u00edch, jako jsou brusiva, slinut\u00e9 v\u00fdrobky, materi\u00e1ly pro plazmov\u00e9 st\u0159\u00edk\u00e1n\u00ed a plniva. Krom\u011b toho se oxid hlinit\u00fd vyskytuje tak\u00e9 jako monokrystaly, nosi\u010de katalyz\u00e1tor\u016f a fluorescen\u010dn\u00ed l\u00e1tky. N\u011bkter\u00e1 pou\u017eit\u00ed oxidu hlinit\u00e9ho vy\u017eaduj\u00ed jeho vysokou \u010distotu a \u00fazkou distribuci velikosti \u010d\u00e1stic, zat\u00edmco jin\u00e1 vy\u017eaduj\u00ed specifick\u00e9 tvary; nap\u0159\u00edklad keramick\u00e9 filtry pou\u017e\u00edvan\u00e9 v uheln\u00fdch elektr\u00e1rn\u00e1ch mus\u00ed obsahovat pr\u00e1\u0161kov\u00fd oxid hlinit\u00fd o pr\u016fm\u011bru 100 mikron\u016f Filtry pro odvod spalin vy\u017eaduj\u00ed pro optim\u00e1ln\u00ed pou\u017eit\u00ed pr\u00e1\u0161ek v\u00e1lcovit\u00e9ho tvaru, jeho\u017e pr\u016fm\u011br se rovn\u00e1 100 mikron\u016fm v pr\u016fm\u011bru.<\/p>\n
V\u011bt\u0161ina oxidu hlinit\u00e9ho se vyr\u00e1b\u00ed Bayerov\u00fdm procesem, kter\u00fd jako surovinu pou\u017e\u00edv\u00e1 bauxit - zemit\u00fd miner\u00e1l. \u010c\u00e1st oxidu hlinit\u00e9ho se t\u011b\u017e\u00ed ze zem\u011b a dopravuje do z\u00e1vod\u016f na v\u00fdrobu oxidu hlinit\u00e9ho, kde se rozpou\u0161t\u00ed vodn\u00fdmi roztoky hydroxid\u016f a filtruje, \u010d\u00e1st oxidu hlinit\u00e9ho se pak pos\u00edl\u00e1 do hlin\u00edkov\u00fdch hut\u00ed, kde se elektrolyzuje na kovov\u00fd hlin\u00edk; zb\u00fdvaj\u00edc\u00ed kusy se kalcinuj\u00ed na r\u016fzn\u00e9 keramick\u00e9 v\u00fdrobky, jako jsou izol\u00e1tory, \u017e\u00e1ruvzdorn\u00e9 materi\u00e1ly a brusiva, a tak\u00e9 na kostn\u00ed implant\u00e1ty, kostn\u00ed\/zubn\u00ed implant\u00e1ty a tak\u00e9 na laboratorn\u00ed n\u00e1dob\u00ed a \u017e\u00e1ruvzdorn\u00e9 vyzd\u00edvky laboratorn\u00edch pec\u00ed.<\/p>\n
Oxid hlinit\u00fd je komodita, co\u017e znamen\u00e1, \u017ee jeho cena denn\u011b kol\u00eds\u00e1 v z\u00e1vislosti na nab\u00eddce a popt\u00e1vce. V\u00fdrobci tuto cenu pe\u010dliv\u011b sleduj\u00ed, aby podle n\u00ed upravili v\u00fdrobn\u00ed n\u00e1klady, a obvykle ji dod\u00e1vaj\u00ed voln\u011b lo\u017eenou v kamionech nebo \u017eelezni\u010dn\u00edch vag\u00f3nech; v z\u00e1vislosti na vzd\u00e1lenosti a rychlosti pot\u0159ebn\u00e9 pro p\u0159epravu m\u016f\u017ee b\u00fdt dod\u00e1v\u00e1na tak\u00e9 lod\u00ed.<\/p>\n
Hlin\u00edk je jednou z nejpou\u017e\u00edvan\u011bj\u0161\u00edch technick\u00fdch keramik. D\u00edky sv\u00fdm vlastnostem je tvrd\u00fd, chemicky inertn\u00ed a stabiln\u00ed p\u0159i vysok\u00fdch teplot\u00e1ch; pr\u00e1\u0161kov\u00fd oxid hlinit\u00fd je ide\u00e1ln\u00ed pro v\u00fdrobu materi\u00e1l\u016f odoln\u00fdch proti opot\u0159eben\u00ed a \u017e\u00e1ruvzdorn\u00fdch v\u00fdrobk\u016f pro r\u016fzn\u00e9 aplikace. Hlin\u00edk vykazuje tak\u00e9 izola\u010dn\u00ed a elektrick\u00e9 vlastnosti; vysoce \u010dist\u00e9 druhy lze dokonce pou\u017e\u00edt jako separ\u00e1tory mezi anodami a katodami, aby se zabr\u00e1nilo zkratu mezi t\u011bmito bateriemi.<\/p>\n
Hlin\u00edk je tak\u00e9 z\u00e1kladn\u00ed surovinou p\u0159i v\u00fdrob\u011b k\u0159em\u00edkov\u00fdch desti\u010dek pro mikro\u010dipy a elektronick\u00e1 za\u0159\u00edzen\u00ed a d\u00edky sv\u00e9 tepeln\u00e9 odolnosti, vysok\u00fdm bod\u016fm varu a t\u00e1n\u00ed a vynikaj\u00edc\u00edm vodivostn\u00edm vlastnostem slou\u017e\u00ed jako z\u00e1kladn\u00ed slo\u017eka p\u0159i v\u00fdrob\u011b sv\u011bteln\u00fdch diod (LED).<\/p>\n
Tento vyn\u00e1lez popisuje zp\u016fsob m\u011b\u0159en\u00ed ne\u010distot ve vzorku pr\u00e1\u0161kov\u00e9ho oxidu hlinit\u00e9ho. Za t\u00edmto \u00fa\u010delem se vzorek oxidu hlinit\u00e9ho vystav\u00ed rentgenov\u00e9mu z\u00e1\u0159en\u00ed a pot\u00e9 se zaznamen\u00e1 jeho difrak\u010dn\u00ed \u00fahel a intenzita pro m\u011b\u0159en\u00ed. N\u00e1sledn\u011b lze vypo\u010d\u00edtat jeho m\u0159\u00ed\u017ekovou konstantu a stanovit korelaci mezi n\u00ed a obsahem ne\u010distot ve vzorku pr\u00e1\u0161kov\u00e9ho oxidu hlinit\u00e9ho.<\/p>","protected":false},"excerpt":{"rendered":"
Alumina powder is an indispensable core and filler material in nanocomposites, and also serves as an important support compound for […]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"footnotes":""},"categories":[2],"tags":[],"class_list":["post-7","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/aluminapowder.net\/cs\/wp-json\/wp\/v2\/posts\/7","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aluminapowder.net\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/aluminapowder.net\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/aluminapowder.net\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/aluminapowder.net\/cs\/wp-json\/wp\/v2\/comments?post=7"}],"version-history":[{"count":1,"href":"https:\/\/aluminapowder.net\/cs\/wp-json\/wp\/v2\/posts\/7\/revisions"}],"predecessor-version":[{"id":8,"href":"https:\/\/aluminapowder.net\/cs\/wp-json\/wp\/v2\/posts\/7\/revisions\/8"}],"wp:attachment":[{"href":"https:\/\/aluminapowder.net\/cs\/wp-json\/wp\/v2\/media?parent=7"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aluminapowder.net\/cs\/wp-json\/wp\/v2\/categories?post=7"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aluminapowder.net\/cs\/wp-json\/wp\/v2\/tags?post=7"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}