![\"\u017d\u00e1ruvzdorn\u00fd](\"http:\/\/aluminaceramic.net\/wp-content\/uploads\/2024\/07\/Alumina-Refractory.jpg\")
<\/p>","protected":false},"excerpt":{"rendered":"\u017d\u00e1ruvzdorn\u00e9 cihly s vysok\u00fdm obsahem oxidu hlinit\u00e9ho chr\u00e1n\u00ed pr\u016fmyslov\u00e9 pece p\u0159ed vysok\u00fdmi teplotami, koroz\u00ed a eroz\u00ed. Jsou nepostradateln\u00e9 v ocel\u00e1\u0159sk\u00e9m pr\u016fmyslu a pom\u00e1haj\u00ed zvy\u0161ovat produktivitu a sni\u017eovat n\u00e1klady. Tento \u010dl\u00e1nek se zab\u00fdv\u00e1 z\u00e1kladn\u00edmi informacemi o t\u011bchto materi\u00e1lech, v\u010detn\u011b jejich vlastnost\u00ed a pou\u017eit\u00ed.<\/p>\n
Z\u00e1kladem \u017e\u00e1ruvzdorn\u00e9ho materi\u00e1lu pou\u017e\u00edvan\u00e9ho p\u0159i taven\u00ed hlin\u00edku je kalcinovan\u00fd bauxit. Tento materi\u00e1l je odoln\u00fd v\u016f\u010di hlin\u00edkov\u00e9 l\u00e1zni a soln\u00fdm tavidl\u016fm. Nab\u00edz\u00ed tak\u00e9 dobrou tepelnou stabilitu a odolnost proti chemick\u00e9 erozi strusky.<\/p>\n
\u017d\u00e1ruvzdorn\u00e9 materi\u00e1ly z oxidu hlinit\u00e9ho se \u010dasto pou\u017e\u00edvaj\u00ed v pr\u016fmyslov\u00e9m prost\u0159ed\u00ed s vysok\u00fdmi teplotami k ochran\u011b kovov\u00fdch slitin a stavebn\u00edch d\u00edl\u016f p\u0159ed p\u0159eh\u0159\u00e1t\u00edm, nap\u0159\u00edklad stavebn\u00edch d\u00edl\u016f ze slitiny m\u011bdi. D\u00edky jejich vynikaj\u00edc\u00ed odolnosti proti vysok\u00fdm teplot\u00e1m, ot\u011bru, chemick\u00e9mu napaden\u00ed a instalaci se jedn\u00e1 o jednoduch\u00e1 a n\u00e1kladov\u011b efektivn\u00ed \u0159e\u0161en\u00ed, kter\u00e1 vy\u017eaduj\u00ed jen m\u00e1lo oprav; jejich n\u00edzk\u00e9 n\u00e1klady na \u00fadr\u017ebu zkracuj\u00ed prostoje na pracovi\u0161t\u00edch, \u0161et\u0159\u00ed n\u00e1klady na pracovn\u00ed s\u00edlu a v\u00fdrazn\u011b sni\u017euj\u00ed spot\u0159ebu energie.<\/p>\n
Izola\u010dn\u00ed vlastnosti \u017e\u00e1ruvzdorn\u00fdch materi\u00e1l\u016f s vysok\u00fdm obsahem oxidu hlinit\u00e9ho jsou zvl\u00e1\u0161t\u011b v\u00fdhodn\u00e9 v pec\u00edch a pec\u00edch, kde pom\u00e1haj\u00ed p\u0159edch\u00e1zet \u0161kod\u00e1m zp\u016fsoben\u00fdm intenzivn\u00edm teplem vznikaj\u00edc\u00edm p\u0159i v\u00fdrobn\u00edch procesech a z\u00e1rove\u0148 \u0161et\u0159\u00ed energii d\u00edky sn\u00ed\u017een\u00fdm energetick\u00fdm ztr\u00e1t\u00e1m z unikaj\u00edc\u00edch struktur. D\u00edky t\u011bmto v\u00fdhod\u00e1m se \u017e\u00e1ruvzdorn\u00e9 materi\u00e1ly s vysok\u00fdm obsahem oxidu hlinit\u00e9ho rychle st\u00e1vaj\u00ed obl\u00edben\u00fdm materi\u00e1lem p\u0159i vyzd\u00edv\u00e1n\u00ed pec\u00ed nebo pec\u00ed.<\/p>\n
Vysokohlinit\u00e9 lit\u00e9 \u017e\u00e1ruvzdorn\u00e9 materi\u00e1ly maj\u00ed dobrou odolnost v\u016f\u010di roztaven\u00e9mu hlin\u00edku (Al) a jeho slitin\u00e1m, ale v tavic\u00edch pec\u00edch jsou n\u00e1chyln\u00e9 ke korozi nad lini\u00ed kovu v d\u016fsledku reakc\u00ed, kter\u00e9 zp\u016fsobuj\u00ed objemovou kontrakci, co\u017e vede k tvorb\u011b korundu, kter\u00fd vede ke korozi. V\u00fdzkumn\u00edci aktivn\u011b pracuj\u00ed na zp\u016fsobech, jak zv\u00fd\u0161it v\u00fdkonnost \u017e\u00e1ruvzdorn\u00fdch materi\u00e1l\u016f.<\/p>\n
Jednou z mo\u017enost\u00ed, jak zlep\u0161it odolnost \u017e\u00e1ruvzdorn\u00fdch materi\u00e1l\u016f proti korozi a zabr\u00e1nit kontaminaci Al nad kovov\u00fdmi linkami, je p\u0159id\u00e1n\u00ed nesm\u00e1\u010div\u00fdch p\u0159\u00edsad (NWA). NWA mohou zabr\u00e1nit tvorb\u011b spinelu, kter\u00fd p\u0159isp\u00edv\u00e1 ke korozi Al2O3. T\u00edm by tyto NWA mohly zlep\u0161it korozn\u00ed odolnost t\u011bchto materi\u00e1l\u016f a z\u00e1rove\u0148 pomoci zabr\u00e1nit kontaminaci Al nad jejich kovovou lini\u00ed.<\/p>\n
\u017d\u00e1ruvzdorn\u00fd materi\u00e1l s vysok\u00fdm obsahem oxidu hlinit\u00e9ho je \u0161iroce vyu\u017e\u00edv\u00e1n v metalurgick\u00fdch pec\u00edch, keramick\u00fdch pec\u00edch a skl\u00e1\u0159sk\u00fdch n\u00e1dr\u017e\u00edch pro sv\u00e9 extr\u00e9mn\u00ed teploty, n\u00edzkou tepelnou vodivost a odolnost v\u016f\u010di korozivn\u00edm l\u00e1tk\u00e1m, jako je roztaven\u00fd kov a koroze strusky. Krom\u011b toho tento typ materi\u00e1lu poskytuje odolnost proti tepeln\u00fdm \u0161ok\u016fm.<\/p>\n
Materi\u00e1l ur\u010den\u00fd pro pou\u017eit\u00ed v metalurgick\u00fdch pec\u00edch a sl\u00e9v\u00e1rn\u00e1ch. D\u00edky n\u00edzk\u00e9 rozta\u017enosti a\u017e do 1540oC a vynikaj\u00edc\u00ed odolnosti proti p\u016fsoben\u00ed strusky je tento materi\u00e1l vynikaj\u00edc\u00ed volbou pro t\u011bsn\u00e9 spojen\u00ed s jin\u00fdmi \u017e\u00e1ruvzdorn\u00fdmi materi\u00e1ly a bezpe\u010dnostn\u00ed vyzd\u00edvky p\u00e1nv\u00ed a odl\u00e9vac\u00edch pec\u00ed.<\/p>\n
Bublinkov\u00fd oxid hlinit\u00fd je \u00fa\u010dinn\u00fd izolant s vysokou pevnost\u00ed za tepla a n\u00edzkou tepelnou vodivost\u00ed, kter\u00fd nab\u00edz\u00ed vynikaj\u00edc\u00ed pevnost za tepla a z\u00e1rove\u0148 z\u016fst\u00e1v\u00e1 tepeln\u011b inertn\u00ed. Vyzna\u010duje se dvojn\u00e1sobnou objemovou hustotou oproti cihl\u00e1m z oxidu hlinit\u00e9ho pr\u00e9miov\u00e9 kvality, tak\u017ee je vhodn\u00fd pro konstruk\u010dn\u00ed aplikace vy\u017eaduj\u00edc\u00ed izola\u010dn\u00ed schopnosti a z\u00e1rove\u0148 je mikrovlnn\u011b a VF transparentn\u00ed.<\/p>\n
Tento \u017e\u00e1ruvzdorn\u00fd materi\u00e1l se skl\u00e1d\u00e1 z hrub\u00fdch superkalcinovan\u00fdch kameninov\u00fdch agreg\u00e1t\u016f a reaktivn\u00edch kalcinovan\u00fdch kameninov\u00fdch jemn\u00fdch \u010d\u00e1stic, kter\u00e9 byly superkalcinov\u00e1ny p\u0159i vysok\u00e9 teplot\u011b a pot\u00e9 sm\u00edch\u00e1ny dohromady pomoc\u00ed reaktivn\u00edch kalcinovan\u00fdch kameninov\u00fdch jemn\u00fdch \u010d\u00e1stic z marock\u00fdch geomateri\u00e1l\u016f, pak p\u0159\u00edmo v\u00e1zanou mikrostrukturou s p\u0159eva\u017euj\u00edc\u00ed aluminokorundovou f\u00e1z\u00ed jako hlavn\u00ed slo\u017ekou (b\u00edl\u00e9 barvy s kruhov\u00fdmi p\u00f3ry pro vynikaj\u00edc\u00ed odolnost proti erozi tekouc\u00ed tekutou ocel\u00ed), jako\u017e i velmi hustou matric\u00ed t\u00e9to f\u00e1ze, kter\u00e1 p\u0159ed\u010d\u00ed jin\u00e9 v\u00fdrobky s vysok\u00fdm obsahem oxidu hlinit\u00e9ho, jako jsou k\u0159emi\u010dit\u00e9 cihly, pokud jde o vynikaj\u00edc\u00ed izola\u010dn\u00ed vlastnosti. Obr\u00e1zek 6 zobrazuje tuto mikrostrukturu p\u0159i mal\u00e9m, resp. velk\u00e9m zv\u011bt\u0161en\u00ed pomoc\u00ed optick\u00e9 mikroskopie z marock\u00fdch geomateri\u00e1l\u016f geomateri\u00e1l\u016f pou\u017eit\u00fdch jako zdroj.<\/p>\n
\u017d\u00e1ruvzdorn\u00e9 materi\u00e1ly z oxidu hlinit\u00e9ho se vyzna\u010duj\u00ed vynikaj\u00edc\u00ed chemickou odolnost\u00ed, tak\u017ee jsou schopny odol\u00e1vat korozi zp\u016fsoben\u00e9 kovy, jako je m\u011b\u010f a roztaven\u00e1 struska, vysok\u00fdm teplot\u00e1m pr\u016fmyslov\u00fdch proces\u016f a jsou tak\u00e9 cenov\u011b v\u00fdhodnou volbou pro r\u016fzn\u00e9 aplikace, jako je izolace n\u00e1dob a izolace pec\u00ed. Tento materi\u00e1l je vynikaj\u00edc\u00ed izola\u010dn\u00ed volbou.<\/p>\n
\u017d\u00e1ruvzdorn\u00e9 v\u00fdrobky z oxidu hlinit\u00e9ho poskytuj\u00ed vynikaj\u00edc\u00ed izolaci d\u00edky dut\u00fdm koul\u00edm oxidu hlinit\u00e9ho spojen\u00fdm pevn\u00fdm cementem. Jejich lehk\u00e1 konstrukce nab\u00edz\u00ed tepelnou izolaci bez v\u00fdrazn\u00e9ho sn\u00ed\u017een\u00ed mechanick\u00e9 pevnosti - co\u017e je vynikaj\u00edc\u00ed kombinace. \u017d\u00e1ruvzdorn\u00e9 v\u00fdrobky z oxidu hlinit\u00e9ho tak\u00e9 odol\u00e1vaj\u00ed vysok\u00fdm teplot\u00e1m v prost\u0159ed\u00ed, jako jsou pece, chemick\u00e9 provozy nebo kontinu\u00e1ln\u00ed lic\u00ed tundry, ani\u017e by \u010dasem ztr\u00e1cely pevnost.<\/p>\n
\u017d\u00e1ruvzdorn\u00fd oxid hlinit\u00fd se skl\u00e1d\u00e1 z r\u016fzn\u00fdch surovin, jako je bauxit a \u0161amot, a obvykle se vyr\u00e1b\u00ed lisov\u00e1n\u00edm za sucha p\u0159i vysok\u00fdch teplot\u00e1ch p\u0159ed vyp\u00e1len\u00edm, aby se vytvrdil. Kvalitu \u0161amotu lze m\u011b\u0159it pomoc\u00ed standardn\u00edch zkou\u0161ek, jako je tepeln\u00e1 vodivost, cyklick\u00e1 zkou\u0161ka tepeln\u00fdm \u0161okem, m\u011b\u0159en\u00ed otev\u0159en\u00e9 p\u00f3rovitosti a m\u011b\u0159en\u00ed smr\u0161t\u011bn\u00ed p\u0159i v\u00fdpalu. Tyto zkou\u0161ky jsou z\u00e1sadn\u00ed pro p\u0159edpov\u011b\u010f vlastnost\u00ed \u017e\u00e1ruvzdorn\u00fdch materi\u00e1l\u016f p\u0159i vysok\u00fdch teplot\u00e1ch a nam\u00e1h\u00e1n\u00ed a pro identifikaci p\u0159\u00edpadn\u00fdch vad nebo poruch v jejich struktu\u0159e. Krom\u011b toho m\u016f\u017ee anal\u00fdza mikrostruktury pomoc\u00ed rastrovac\u00edho elektronov\u00e9ho a binokul\u00e1rn\u00edho mikroskopu d\u00e1le odhalit strukturu krystalick\u00e9 f\u00e1ze, vzorce distribuce velikosti \u010d\u00e1stic, chemick\u00e9 slo\u017een\u00ed a chemickou skladbu.<\/p>\n
\u017d\u00e1ruvzdorn\u00e9 materi\u00e1ly z oxidu hlinit\u00e9ho jsou nezbytnou sou\u010d\u00e1st\u00ed ocel\u00e1\u0159sk\u00fdch, cement\u00e1\u0159sk\u00fdch a petrochemick\u00fdch v\u00fdrobn\u00edch proces\u016f. Pom\u00e1haj\u00ed zaji\u0161\u0165ovat spr\u00e1vnou funkci za\u0159\u00edzen\u00ed pou\u017e\u00edvan\u00fdch v t\u011bchto odv\u011btv\u00edch, sni\u017euj\u00ed prostoje a n\u00e1klady na \u00fadr\u017ebu. Krom\u011b toho jsou \u017e\u00e1ruvzdorn\u00e9 materi\u00e1ly z oxidu hlinit\u00e9ho trvanliv\u00e9 a maj\u00ed dobrou odolnost proti opot\u0159eben\u00ed. Tyto vlastnosti jim umo\u017e\u0148uj\u00ed odol\u00e1vat vysok\u00fdm teplot\u00e1m a n\u00e1ro\u010dn\u00fdm chemick\u00fdm podm\u00ednk\u00e1m.<\/p>\n
Za \u00fa\u010delem zv\u00fd\u0161en\u00ed odolnosti \u017e\u00e1ruvzdorn\u00fdch materi\u00e1l\u016f z oxidu hlinit\u00e9ho proti korozi vyvinuli v\u011bdci nov\u00e9 typy materi\u00e1l\u016f na b\u00e1zi nanotechnologi\u00ed. Tyto materi\u00e1ly obsahuj\u00ed oxid b\u00f3ru, kter\u00fd je chemicky stabiln\u011bj\u0161\u00ed ne\u017e voln\u00fd b\u00f3r. Obsahuj\u00ed tak\u00e9 velk\u00e9 mno\u017estv\u00ed krystalick\u00e9ho oxidu hlinit\u00e9ho, co\u017e jim pom\u00e1h\u00e1 odol\u00e1vat degradaci vlivem tepeln\u00fdch \u0161ok\u016f. Tyto materi\u00e1ly se v sou\u010dasnosti pou\u017e\u00edvaj\u00ed p\u0159i v\u00fdrob\u011b cementu, skla a dal\u0161\u00edch pr\u016fmyslov\u00fdch v\u00fdrobk\u016f.<\/p>\n
V\u00fdb\u011br \u017e\u00e1ruvzdorn\u00e9ho materi\u00e1lu je rozhoduj\u00edc\u00ed pro stabilitu \u017e\u00e1ruvzdorn\u00e9ho materi\u00e1lu p\u0159i zv\u00fd\u0161en\u00fdch teplot\u00e1ch. Tyto materi\u00e1ly mus\u00ed m\u00edt vysok\u00fd bod t\u00e1n\u00ed a b\u00fdt tepeln\u011b stabiln\u00ed, co\u017e znamen\u00e1, \u017ee se p\u0159i vysok\u00fdch teplot\u00e1ch neroztav\u00ed ani nerozlo\u017e\u00ed. Mus\u00ed m\u00edt tak\u00e9 n\u00edzk\u00fd koeficient rozta\u017enosti a b\u00fdt chemicky odoln\u00e9 v\u016f\u010di korozi a erozi.<\/p>\n
Existuje n\u011bkolik typ\u016f \u017e\u00e1ruvzdorn\u00fdch materi\u00e1l\u016f z oxidu hlinit\u00e9ho, v\u010detn\u011b mullitu a korundu. Tyto \u017e\u00e1ruvzdorn\u00e9 materi\u00e1ly jsou vhodn\u00e9 zejm\u00e9na pro st\u0159echy elektrick\u00fdch pec\u00ed a n\u00e1stavby vysok\u00fdch pec\u00ed. Pou\u017e\u00edvaj\u00ed se tak\u00e9 v tundr\u00e1ch pro kontinu\u00e1ln\u00ed lit\u00ed. Tyto \u017e\u00e1ruvzdorn\u00e9 materi\u00e1ly maj\u00ed nejvy\u0161\u0161\u00ed obsah oxidu hlinit\u00e9ho, d\u00edky \u010demu\u017e jsou mimo\u0159\u00e1dn\u011b pevn\u00e9 a odoln\u00e9 v\u016f\u010di zat\u00ed\u017een\u00ed.<\/p>\n
<\/p>","protected":false},"excerpt":{"rendered":"
Alumina Refractory – The Unsung Fireproof Hero of Industry High alumina refractory bricks protect industrial furnaces from high temperatures, corrosion, and erosion. They are indispensable in the steel industry and help enhance productivity and cost savings. This article will cover the basic information about these materials, including their properties and applications. The refractory material used… \u010c\u00edst d\u00e1le »\u017d\u00e1ruvzdorn\u00fd oxid hlinit\u00fd: Neop\u011bvovan\u00fd ohnivzdorn\u00fd hrdina pr\u016fmyslu<\/span><\/a><\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"off","neve_meta_content_width":70,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","footnotes":""},"categories":[13],"tags":[],"class_list":["post-133","post","type-post","status-publish","format-standard","hentry","category-product"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/aluminaceramic.net\/cs\/wp-json\/wp\/v2\/posts\/133","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aluminaceramic.net\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/aluminaceramic.net\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/aluminaceramic.net\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/aluminaceramic.net\/cs\/wp-json\/wp\/v2\/comments?post=133"}],"version-history":[{"count":3,"href":"https:\/\/aluminaceramic.net\/cs\/wp-json\/wp\/v2\/posts\/133\/revisions"}],"predecessor-version":[{"id":136,"href":"https:\/\/aluminaceramic.net\/cs\/wp-json\/wp\/v2\/posts\/133\/revisions\/136"}],"wp:attachment":[{"href":"https:\/\/aluminaceramic.net\/cs\/wp-json\/wp\/v2\/media?parent=133"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aluminaceramic.net\/cs\/wp-json\/wp\/v2\/categories?post=133"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aluminaceramic.net\/cs\/wp-json\/wp\/v2\/tags?post=133"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}