V\u00fdrobky z keramick\u00e9ho oxidu hlinit\u00e9ho maj\u00fa fyzik\u00e1lne, mechanick\u00e9 a elektrick\u00e9 vlastnosti, v\u010faka ktor\u00fdm s\u00fa vhodn\u00e9 na cel\u00fd rad priemyseln\u00fdch aplik\u00e1ci\u00ed vr\u00e1tane opotrebovan\u00fdch d\u00fdz a krvn\u00fdch ventilov, puzdier elektrick\u00fdch konektorov, hermetick\u00fdch tesnen\u00ed, vysokonap\u00e4\u0165ov\u00fdch puzdier a zost\u00e1v na sp\u00e1jkovanie keramiky s kovom. Vyzna\u010duj\u00fa sa vysokou pevnos\u0165ou a tvrdos\u0165ou, ako aj silnou odolnos\u0165ou vo\u010di chemik\u00e1li\u00e1m, er\u00f3zii a kor\u00f3zii, pri\u010dom ich n\u00edzka tepeln\u00e1 roz\u0165a\u017enos\u0165 umo\u017e\u0148uje odol\u00e1va\u0165 vysok\u00fdm teplot\u00e1m.<\/p>\n
Ako keramick\u00fd materi\u00e1l sa oxid hlinit\u00fd m\u00f4\u017ee pochv\u00e1li\u0165 v\u00fdnimo\u010dnou tvrdos\u0165ou; s tvrdos\u0165ou 9 pod\u013ea Mohsa sa pribli\u017euje tvrdosti diamantov a odol\u00e1va ve\u013ekej sile a tlaku bez toho, aby pod tlakom praskol. Oxid hlinit\u00fd sa m\u00f4\u017ee pochv\u00e1li\u0165 aj ve\u013ekou pevnos\u0165ou v \u0165ahu a odolnos\u0165ou, v\u010faka \u010domu je vhodn\u00fd na n\u00e1ro\u010dn\u00e9 aplik\u00e1cie.<\/p>\n
Hlin\u00edk sa vyzna\u010duje vynikaj\u00facimi vlastnos\u0165ami kor\u00f3zie a tepelnej stability, v\u010faka \u010domu je vhodn\u00fd pre chemicky citliv\u00e9 odvetvia, ako je elektronika alebo automobilov\u00fd priemysel. Okrem toho jeho n\u00edzky koeficient roz\u0165a\u017enosti umo\u017e\u0148uje presnos\u0165, pokia\u013e ide o presnos\u0165 a konzistenciu pri v\u00fdrobn\u00fdch procesoch.<\/p>\n
Oxid hlinit\u00fd je ide\u00e1lnym materi\u00e1lom pre vysoko presn\u00e9 aplik\u00e1cie vy\u017eaduj\u00face hladk\u00fd povrch v\u010faka svojim samomazn\u00fdm vlastnostiam, ktor\u00e9 pom\u00e1haj\u00fa zni\u017eova\u0165 trenie a opotrebovanie zariadenia, predl\u017euj\u00fa jeho \u017eivotnos\u0165 a z\u00e1rove\u0148 zlep\u0161uj\u00fa v\u00fdkon. Navy\u0161e, v\u010faka v\u00fdnimo\u010dne n\u00edzkemu koeficientu tepelnej roz\u0165a\u017enosti je oxid hlinit\u00fd ide\u00e1lnou vo\u013ebou materi\u00e1lu pre presn\u00e9 v\u00fdrobky a komponenty so stabiln\u00fdmi rozmermi.<\/p>\n
Na z\u00e1klade potrieb va\u0161ej aplik\u00e1cie je k dispoz\u00edcii cel\u00fd rad typov oxidu hlinit\u00e9ho na v\u00fdber. \u010cist\u00e1 forma 99,5 % je vynikaj\u00facou vo\u013ebou na pou\u017eitie v pokovovan\u00fdch v\u00fdrobkoch, preto\u017ee sa m\u00f4\u017ee pochv\u00e1li\u0165 vysokou pevnos\u0165ou v tlaku a ohybe, ako aj v\u00fdnimo\u010dnou hermetickos\u0165ou, v\u010faka \u010domu je vhodn\u00fd na sp\u00e1jkovanie keramiky s kovom a pre zdravotn\u00edcke zariadenia, r\u00f6ntgenov\u00e9 trubice a elektr\u00f3nov\u00e9 mikroskopy.<\/p>\n
V\u00fdroba keramiky z oxidu hlinit\u00e9ho si vzh\u013eadom na jej ve\u013ek\u00fa \u0161pecifick\u00fa hmotnos\u0165 vy\u017eaduje pou\u017eitie vhodn\u00e9ho procesu tvarovania. Ak sa pr\u00e1\u0161ok pred za\u010dat\u00edm v\u00fdpalu dobre nesformuje, mohlo by d\u00f4js\u0165 k zmr\u0161teniu, ktor\u00e9 by ohrozilo fyzik\u00e1lne vlastnosti a mohlo by negat\u00edvne ovplyvni\u0165 fyzik\u00e1lne vlastnosti. Existuj\u00fa r\u00f4zne techniky vytv\u00e1rania tejto keramiky, ako napr\u00edklad lisovanie za sucha, studen\u00fd izostatick\u00fd lis (CIP), vstrekovanie a odlievanie, z ktor\u00fdch ka\u017ed\u00e1 m\u00e1 svoje vlastn\u00e9 v\u00fdhody a nev\u00fdhody; v\u0161etky zah\u0155\u0148aj\u00fa p\u00f4sobenie tlaku z viacer\u00fdch smerov na lep\u0161ie zhutnenie a zlo\u017eitej\u0161ie tvary.<\/p>\n
Tvrdos\u0165 keramick\u00e9ho oxidu hlinit\u00e9ho ho rob\u00ed vysoko odoln\u00fdm vo\u010di oderu, n\u00e1razom a kor\u00f3zii, zatia\u013e \u010do jeho chemick\u00e1 inertnos\u0165 a odolnos\u0165 vo\u010di vysok\u00fdm teplot\u00e1m z neho robia dobr\u00fa vo\u013ebu materi\u00e1lu na pou\u017eitie ako oblo\u017eenie \u017e\u013eabov, syst\u00e9mov mletia cementu, syst\u00e9mov mletia v uho\u013en\u00fdch elektr\u00e1r\u0148ach, syst\u00e9mov \u00fapravy drvenej rudy a in\u00fdch priemyseln\u00fdch zariaden\u00ed. Hlin\u00edkov\u00e1 keramika okrem toho reguluje trenie medzi komponentmi, v\u010faka \u010domu je vhodn\u00e1 pre krvn\u00e9 ventily, d\u00fdzy a in\u00e9 lek\u00e1rske n\u00e1stroje.<\/p>\n
Hlin\u00edkov\u00fa keramiku mo\u017eno vyr\u00e1ba\u0165 tenk\u00fa a ve\u013ek\u00fa bez toho, aby sa zn\u00ed\u017eil pomer pevnosti a hmotnosti, pri\u010dom st\u00e1le pon\u00faka vysok\u00fa rozmerov\u00fa stabilitu. Okrem toho mo\u017eno tento materi\u00e1l formova\u0165 do predmetov s r\u00f4znou povrchovou \u00fapravou, ako s\u00fa hladk\u00e9, \u0161trukt\u00farovan\u00e9 alebo ryhovan\u00e9 povrchy pre r\u00f4zne predmety z neho tvarovan\u00e9 - v\u010faka t\u00fdmto vlastnostiam je oxid hlinit\u00fd ide\u00e1lny pre aplik\u00e1cie, ako s\u00fa diely podliehaj\u00face opotrebovaniu, tesniace kr\u00fa\u017eky, tesnenia \u010derpadiel a puzdr\u00e1 elektrick\u00fdch konektorov.<\/p>\n
Zu\u0161\u013eachtenie zrna je z\u00e1kladn\u00fdm faktorom zvy\u0161ovania odolnosti keramiky oxidu hlinit\u00e9ho proti opotrebovaniu. So zmen\u0161ovan\u00edm ve\u013ekosti z\u0155n sa ich rozlo\u017eenie st\u00e1va nerovnomernej\u0161\u00edm, \u010do vedie k v\u00e4\u010d\u0161ej koncentr\u00e1cii nap\u00e4tia na hraniciach z\u0155n a k zvy\u0161ovaniu koncentr\u00e1cie nap\u00e4tia v z\u00f3nach koncentr\u00e1cie nap\u00e4tia. Zjemnenie zrna pom\u00e1ha zn\u00ed\u017ei\u0165 jeho koeficient abraz\u00edvneho opotrebenia - faktor, ktor\u00fd je najviac zodpovedn\u00fd za odolnos\u0165 proti opotrebeniu.<\/p>\n
Hlin\u00edkov\u00e1 keramika je zn\u00e1ma svoj\u00edm n\u00edzkym koeficientom tepelnej roz\u0165a\u017enosti (CTE). Na \u010fal\u0161ie zn\u00ed\u017eenie tejto hodnoty CTE sa m\u00f4\u017eu prid\u00e1va\u0165 mal\u00e9 mno\u017estv\u00e1 prvkov vz\u00e1cnych zem\u00edn bu\u010f do matrice, alebo ako druh\u00e9 f\u00e1zy do skla, ktor\u00e9 sa nach\u00e1dza medzi jej kry\u0161talick\u00fdmi zrnami.<\/p>\n
Lek\u00e1ri sa \u010doraz \u010dastej\u0161ie obracaj\u00fa na keramiku oxidu hlinit\u00e9ho na vytv\u00e1ranie umel\u00fdch kost\u00ed a k\u013abov v\u010faka jej biokompatibilite, biologickej inertnosti, fyzik\u00e1lno-chemickej stabilite a vysokej tvrdosti.<\/p>\n
V\u010faka svojim vynikaj\u00facim elektrick\u00fdm vlastnostiam a dielektrickej pevnosti 15 kV\/mm sa oxid hlinit\u00fd \u010dasto vyber\u00e1 ako substr\u00e1t pre zapa\u013eovacie svie\u010dky. V\u010faka svojim izola\u010dn\u00fdm a pevnostn\u00fdm vlastnostiam sa oxid hlinit\u00fd m\u00f4\u017ee pou\u017e\u00edva\u0165 aj v z\u00e1suvk\u00e1ch alebo pl\u00e1\u0161\u0165och obvodov.<\/p>\n
Oxid hlinit\u00fd je mimoriadne pevn\u00fd materi\u00e1l, ktor\u00fd sa d\u00e1 le\u0161ti\u0165 na mimoriadne jemn\u00fd povrch, tak\u017ee je vhodn\u00fd na n\u00e1stroje, br\u00fasne kot\u00fa\u010de a abraz\u00edva, ako aj na lisovacie formy s vysok\u00fdmi po\u017eiadavkami na presnos\u0165. V\u010faka svojim n\u00e1razuvzdorn\u00fdm vlastnostiam tvor\u00ed aj neoddelite\u013en\u00fa s\u00fa\u010das\u0165 syst\u00e9mov pancierovania.<\/p>\n
Hlin\u00edkov\u00e1 keramika m\u00e1 vynikaj\u00facu chemick\u00fa stabilitu a odolnos\u0165 proti kor\u00f3zii, \u010do z nej rob\u00ed vynikaj\u00faci materi\u00e1l pre priemyseln\u00e9 aplik\u00e1cie. Odol\u00e1va vysok\u00fdm teplot\u00e1m, pri\u010dom si st\u00e1le zachov\u00e1va mechanick\u00fa pevnos\u0165, chemick\u00fa inertnos\u0165, n\u00edzku mieru er\u00f3zie a vynikaj\u00face elektroizola\u010dn\u00e9 vlastnosti. Biokompatibilita navy\u0161e zaru\u010duje, \u017ee pri kontakte s \u013eudsk\u00fdmi alebo zvierac\u00edmi tkanivami nedoch\u00e1dza k \u017eiadnym negat\u00edvnym ved\u013eaj\u0161\u00edm \u00fa\u010dinkom.<\/p>\n
Kor\u00f3zia znamen\u00e1 interakciu pevn\u00fdch materi\u00e1lov a agres\u00edvneho prostredia, zvy\u010dajne roztokov kysel\u00edn alebo z\u00e1sad. Hlin\u00edk odol\u00e1va chemick\u00e9mu p\u00f4sobeniu v\u010faka svojej n\u00edzkej rozpustnosti v kyselin\u00e1ch a z\u00e1sad\u00e1ch; t\u00e1to odolnos\u0165 bola potvrden\u00e1 testami merania \u00fabytku hmotnosti.<\/p>\n
Odolnos\u0165 keramiky z oxidu hlinit\u00e9ho proti kor\u00f3zii mo\u017eno zlep\u0161i\u0165 aj r\u00f4znymi v\u00fdrobn\u00fdmi postupmi s pou\u017eit\u00edm pr\u00edsad, ako s\u00fa oxid zirkoni\u010dit\u00fd (ZrO2), oxid titani\u010dit\u00fd (TiO2), oxid chr\u00f3mu (Cr2O3) a oxid kremi\u010dit\u00fd (SiO2). Po pridan\u00ed po\u010das v\u00fdrobn\u00fdch procesov tieto pr\u00edsady pom\u00e1haj\u00fa zhut\u0148ova\u0165 a zni\u017eova\u0165 p\u00f3rovitos\u0165 a z\u00e1rove\u0148 posil\u0148uj\u00fa odolnos\u0165 keramiky vo\u010di chemick\u00fdm \u00fatokom.<\/p>\n
Oxid hlinit\u00fd pon\u00faka mnoho v\u00fdhod na pou\u017eitie ako materi\u00e1l vo v\u00fdrobe, od jednoduch\u00e9ho spekania a tvarovania do r\u00f4znych foriem a\u017e po trvanlivos\u0165 s dobrou mechanickou a chemickou odolnos\u0165ou. V d\u00f4sledku toho sa v\u00fdrobky z oxidu hlinit\u00e9ho m\u00f4\u017eu pochv\u00e1li\u0165 ve\u013emi presn\u00fdmi rozmermi ako v\u00fdrobky s takmer sie\u0165ov\u00fdm tvarom s dobr\u00fdmi mechanick\u00fdmi vlastnos\u0165ami a chemickou odolnos\u0165ou.<\/p>\n
Hlin\u00edkov\u00e1 keramika sa zvy\u010dajne vyr\u00e1ba zo surov\u00edn, ktor\u00e9 boli jemne zomlet\u00e9 pred spekan\u00edm bu\u010f v lisoch, alebo v hor\u00facej izostatickej lisovacej peci, aby sa dosiahla vysok\u00e1 hustota. Po vytvoren\u00ed sa t\u00e1to korundov\u00e1 keramika m\u00f4\u017ee n\u00e1sledne formova\u0165 vstrekovan\u00edm, odlievan\u00edm izostatick\u00fdm lisovan\u00edm za studena alebo such\u00fdm lisovan\u00edm do v\u00fdrobkov zlo\u017eit\u00fdch tvarov a ve\u013ekost\u00ed.<\/p>\n
Vynikaj\u00faca odolnos\u0165 oxidu hlinit\u00e9ho vo\u010di opotrebovaniu a kor\u00f3zii z neho rob\u00ed vynikaj\u00faci materi\u00e1l, ktor\u00fd nahr\u00e1dza kovov\u00e9 \u010dasti v mnoh\u00fdch priemyseln\u00fdch aplik\u00e1ci\u00e1ch vr\u00e1tane zapa\u013eovac\u00edch svie\u010dok pre automobilov\u00e9 aj komer\u010dn\u00e9 motory. Hlin\u00edk sa vyzna\u010duje aj vysokou odolnos\u0165ou vo\u010di tepeln\u00fdm \u0161okom, v\u010faka \u010domu je u\u017eito\u010dn\u00fd vo ventiloch a tesneniach ur\u010den\u00fdch na odol\u00e1vanie drsn\u00fdm prostrediam, ako s\u00fa kyseliny fluorovod\u00edkov\u00e9 alebo alkalick\u00e9 v\u00fdpary, \u010do \u010falej zvy\u0161uje spo\u013eahlivos\u0165 v\u010faka jeho vynikaj\u00facim mechanick\u00fdm a elektrick\u00fdm vlastnostiam.<\/p>\n
Substr\u00e1ty z oxidu hlinit\u00e9ho s\u00fa nepostr\u00e1date\u013en\u00e9 pri v\u00fdrobe elektronick\u00fdch zariaden\u00ed a komponentov, preto\u017ee poskytuj\u00fa izola\u010dn\u00fd, ale z\u00e1rove\u0148 tepelne vodiv\u00fd z\u00e1klad, ktor\u00fd chr\u00e1ni obvody pred po\u0161koden\u00edm, prehriat\u00edm a in\u00fdmi probl\u00e9mami, ktor\u00e9 zni\u017euj\u00fa ich \u017eivotnos\u0165. V\u010faka svojej elektrickej izol\u00e1cii je oxid hlinit\u00fd cenn\u00fdm materi\u00e1lom vhodn\u00fdm na pou\u017eitie v r\u00f4znych aplik\u00e1ci\u00e1ch a prostrediach.<\/p>\n
Existuj\u00fa r\u00f4zne s\u00e9rie korundovej keramiky v z\u00e1vislosti od obsahu Al2O3 a pr\u00edsad pou\u017eit\u00fdch pri v\u00fdrobe, napr\u00edklad korundov\u00e1 keramika 75% a 85% m\u00e1 r\u00f4zne vlastnosti v z\u00e1vislosti od \u00farovne \u010distoty; keramika vyroben\u00e1 s vy\u0161\u0161ou \u00farov\u0148ou \u010distoty vykazuje v\u00e4\u010d\u0161iu odolnos\u0165 proti kor\u00f3zii, lep\u0161iu pevnos\u0165 v ohybe a elektroizola\u010dn\u00e9 schopnosti ako keramika s ni\u017e\u0161ou \u00farov\u0148ou \u010distoty. Okrem toho substr\u00e1ty potiahnut\u00e9 sklom poskytuj\u00fa dodato\u010dn\u00fa ochranu a zvy\u0161uj\u00fa \u017eivotnos\u0165.<\/p>\n
Vysok\u00e1 odolnos\u0165 keramiky oxidu hlinit\u00e9ho vo\u010di oderu ju predur\u010duje na pou\u017eitie v n\u00e1strojoch, br\u00fasnych kot\u00fa\u010doch a br\u00fasnych materi\u00e1loch. Tvrdos\u0165 pod\u013ea Mohsa 9 a jej nereakt\u00edvny charakter robia z oxidu hlinit\u00e9ho ob\u013e\u00faben\u00fa vo\u013ebu, pokia\u013e ide o aplik\u00e1cie na obr\u00e1banie. Hlin\u00edk odol\u00e1va teplot\u00e1m a\u017e do 1 800 stup\u0148ov Celzia a z\u00e1rove\u0148 pon\u00faka dobr\u00fa odolnos\u0165 vo\u010di kyselin\u00e1m a z\u00e1sad\u00e1m, ako aj drsn\u00e9mu prostrediu a vysok\u00e9mu pracovn\u00e9mu nap\u00e4tiu bez toho, aby sa \u010dasom naru\u0161ila.<\/p>\n
V\u010faka svojej vysokej hustote a elektroizola\u010dn\u00fdm vlastnostiam je korundov\u00e1 keramika ide\u00e1lnym materi\u00e1lom pre elektrick\u00e9 vodi\u010de a vedenia. Hlin\u00edk m\u00e1 pozoruhodn\u00fa odolnos\u0165 proti oderu, kyselin\u00e1m, z\u00e1sad\u00e1m, chemik\u00e1li\u00e1m a vibr\u00e1ci\u00e1m, ktor\u00e9 zabra\u0148uj\u00fa kor\u00f3zii alebo po\u0161kodeniu sp\u00f4soben\u00e9mu t\u00fdmito faktormi; okrem toho sa m\u00f4\u017ee pochv\u00e1li\u0165 v\u00fdnimo\u010dnou mechanickou pevnos\u0165ou proti vibra\u010dn\u00fdm n\u00e1razom, ktor\u00e9 by inak mohli sp\u00f4sobi\u0165 poruchu jeho komponentov.<\/p>","protected":false},"excerpt":{"rendered":"
Alumina ceramic products feature physical, mechanical and electrical properties that make them suitable for a range of industrial applications, including […]<\/p>\n","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":[6],"tags":[],"class_list":["post-10","post","type-post","status-publish","format-standard","hentry","category-alumina-knowledge"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/aluminaceramics.net\/sk\/wp-json\/wp\/v2\/posts\/10","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aluminaceramics.net\/sk\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/aluminaceramics.net\/sk\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/aluminaceramics.net\/sk\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/aluminaceramics.net\/sk\/wp-json\/wp\/v2\/comments?post=10"}],"version-history":[{"count":3,"href":"https:\/\/aluminaceramics.net\/sk\/wp-json\/wp\/v2\/posts\/10\/revisions"}],"predecessor-version":[{"id":13,"href":"https:\/\/aluminaceramics.net\/sk\/wp-json\/wp\/v2\/posts\/10\/revisions\/13"}],"wp:attachment":[{"href":"https:\/\/aluminaceramics.net\/sk\/wp-json\/wp\/v2\/media?parent=10"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aluminaceramics.net\/sk\/wp-json\/wp\/v2\/categories?post=10"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aluminaceramics.net\/sk\/wp-json\/wp\/v2\/tags?post=10"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}