V\u00fdrobcovia h\u013eadaj\u00fa energeticky \u00fa\u010dinnej\u0161ie motory a chc\u00fa nahradi\u0165 kritick\u00e9 kovy. Tieto mot\u00edvy iniciovali v\u00fdvoj r\u00f4znych keramick\u00fdch materi\u00e1lov a postupov. Reak\u010dne viazan\u00fd karbid krem\u00edka je v\u00fdsledkom t\u00fdchto v\u00fdskumov.Reak\u010dne viazan\u00fd karbid krem\u00edka je typ karbidu krem\u00edka, ktor\u00fd sa vyr\u00e1ba chemickou reakciou medzi grafitom alebo por\u00e9znym uhl\u00edkom s roztaven\u00fdm krem\u00edkom. Materi\u00e1l obsahuje ur\u010dit\u00e9 stopy krem\u00edka, preto sa ozna\u010duje aj ako silik\u00f3novan\u00fd karbid krem\u00edka. jeho vynikaj\u00face vlastnosti odolnosti vo\u010di opotrebovaniu a chemik\u00e1li\u00e1m ho predur\u010duj\u00fa na pou\u017eitie v extr\u00e9mnych prostrediach. V\u010faka svojej vysokej tvrdosti a dobrej teplotnej odolnosti je keramika z karbidu krem\u00edka vhodn\u00e1 na r\u00f4zne typy aplik\u00e1ci\u00ed, ako s\u00fa opotrebovate\u013en\u00e9 diely a axi\u00e1lne lo\u017eisk\u00e1.
\nV tejto pr\u00edru\u010dke sa budeme venova\u0165 r\u00f4znym aspektom reak\u010dne viazan\u00fdch karbidov krem\u00edka, ako s\u00fa ich k\u013e\u00fa\u010dov\u00e9 vlastnosti a aplik\u00e1cie. \u010ealej sa budeme zaobera\u0165 r\u00f4znymi typmi reak\u010dne viazan\u00fdch karbidov krem\u00edka. Za\u010dnime...<\/p>\n
Spracovanie karbidu krem\u00edka viazan\u00e9ho reakciou<\/strong> Ak\u00e9 s\u00fa r\u00f4zne typy reak\u010dne viazan\u00e9ho karbidu krem\u00edka?<\/strong> R\u00f4zne vlastnosti karbidu krem\u00edka<\/strong> R\u00f4zne aplik\u00e1cie karbidu krem\u00edka viazan\u00e9ho reakciou<\/strong> Sisic sa \u0161iroko pou\u017e\u00edva v lopatk\u00e1ch \u010derpadiel a mechanick\u00fdch tesneniach v\u010faka svojej vysokej odolnosti proti oderu. Vlastnosti materi\u00e1lu z\u00e1visia od obsahu vo\u013en\u00e9ho grafitu vo v\u00fdrobku. Reak\u010dne viazan\u00fd karbid krem\u00edka sa pou\u017e\u00edva ako materi\u00e1l na nosy tesnen\u00ed, ktor\u00fd dokonale funguje v nepriazniv\u00fdch prev\u00e1dzkov\u00fdch prostrediach. Manufacturers are looking for more energy-efficient engines and want to replace critical metals. These motives initiated the development of different ceramic materials and processes. Reaction bonded silicon carbide is a result of these investigations.Reaction bonded silicon carbide is a type of silicon carbide that is produced by a chemical reaction between graphite or porous carbon […]<\/p>\n","protected":false},"author":1,"featured_media":280,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[30],"tags":[],"class_list":["post-454","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sic-knowledge"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/siliconcarbide.net\/sk\/wp-json\/wp\/v2\/posts\/454","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/siliconcarbide.net\/sk\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/siliconcarbide.net\/sk\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/siliconcarbide.net\/sk\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/siliconcarbide.net\/sk\/wp-json\/wp\/v2\/comments?post=454"}],"version-history":[{"count":3,"href":"https:\/\/siliconcarbide.net\/sk\/wp-json\/wp\/v2\/posts\/454\/revisions"}],"predecessor-version":[{"id":532,"href":"https:\/\/siliconcarbide.net\/sk\/wp-json\/wp\/v2\/posts\/454\/revisions\/532"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/siliconcarbide.net\/sk\/wp-json\/wp\/v2\/media\/280"}],"wp:attachment":[{"href":"https:\/\/siliconcarbide.net\/sk\/wp-json\/wp\/v2\/media?parent=454"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/siliconcarbide.net\/sk\/wp-json\/wp\/v2\/categories?post=454"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/siliconcarbide.net\/sk\/wp-json\/wp\/v2\/tags?post=454"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\nReak\u010dne viazan\u00fd karbid krem\u00edka sa vyr\u00e1ba zmesou karbidu krem\u00edka a uhl\u00edka s kvapaln\u00fdm krem\u00edkom. Karbid krem\u00edka sa z\u00edskava po reakcii medzi krem\u00edkom a uhl\u00edkom. Zvy\u0161n\u00e9 p\u00f3ry po reakcii s\u00fa vyplnen\u00e9 krem\u00edkom. V\u00fdsledkom je hust\u00fd kompozit SiC-Si.
\nRozdelenie ve\u013ekosti \u010dast\u00edc a pomer medzi SIC a uhl\u00edkom sa u r\u00f4znych v\u00fdrobcov zna\u010dne l\u00ed\u0161i. Preto sa materi\u00e1l vyr\u00e1ba v \u0161irokom rozsahu vlastnost\u00ed a zlo\u017eenia. Napr\u00edklad na jednej strane je mo\u017en\u00e9 infiltrova\u0165 uhl\u00edkov\u00e9 vl\u00e1kno alebo tkaninu tekut\u00fdm krem\u00edkom. Na druhej strane v\u0161ak m\u00f4\u017eete vyrobi\u0165 nepriepustn\u00fd krem\u00edk s mal\u00fdm mno\u017estvom uhl\u00edka.
\nOkrem toho mnoh\u00ed v\u00fdrobcovia vyr\u00e1bali reak\u010dne viazan\u00fd karbid krem\u00edka s pr\u00edpravkami, ktor\u00e9 obsahuj\u00fa organick\u00e9 zm\u00e4k\u010dovadlo, \u010dastice karbidu krem\u00edka a uhl\u00edk. Zmes sa formuje lisovan\u00edm, vytl\u00e1\u010dan\u00edm alebo vstrekovan\u00edm. V\u00fdrobcovia maj\u00fa navy\u0161e dobr\u00fa kontrolu nad toleranciou komponentov, preto\u017ee reak\u010dn\u00fd proces pon\u00faka menej ako 1% rozmerov\u00fdch zmien.<\/p>\n
\nExistuj\u00fa dva z\u00e1kladn\u00e9 typy reak\u010dne viazan\u00e9ho karbidu krem\u00edka:
\n1. Monolitick\u00fd alebo pevn\u00fd karbid krem\u00edka viazan\u00fd reakciou
\nV tomto type karbidu krem\u00edka krem\u00edk prenik\u00e1 do integr\u00e1lnej absorp\u010dnej schopnosti matrice. V d\u00f4sledku toho z\u00edskate nepriepustn\u00e9 zlo\u017eenie. Vo\u013en\u00fd krem\u00edk tie\u017e vytv\u00e1ra povrchov\u00fa \u0161trukt\u00faru, ktor\u00e1 zn\u00ed\u017ei trenie pre pred\u013a\u017eenie \u017eivotnosti s\u00fa\u010diastky.
\nMonolitick\u00fd karbid krem\u00edka viazan\u00fd reakciou je vhodn\u00fdm kandid\u00e1tom na tribologick\u00e9 komponenty. Pou\u017e\u00edva sa v kvapalin\u00e1ch, ktor\u00e9 s\u00fa trochu \u017eierav\u00e9 alebo kysl\u00e9, vr\u00e1tane abraz\u00edvnych, pal\u00edv, \u013eahk\u00fdch uh\u013eovod\u00edkov at\u010f. Pon\u00faka najvy\u0161\u0161iu schopnos\u0165 PV pri spojen\u00ed s r\u00f4znymi mechanick\u00fdmi uhl\u00edkov\u00fdmi materi\u00e1lmi.
\n2. Reak\u010dne viazan\u00fd karbid krem\u00edka s grafitom (CMC)
\nJe to nepriepustn\u00fd materi\u00e1l s jedine\u010dnou \u0161trukt\u00farou povrchu. Jeho kr\u00e1sna \u0161trukt\u00fara je sp\u00f4soben\u00e1 pr\u00edtomnos\u0165ou grafitu a krem\u00edka. Tento typ keramiky z karbidu krem\u00edka m\u00e1 tie\u017e vynikaj\u00facu tepeln\u00fa vodivos\u0165 a ni\u017e\u0161\u00ed stupe\u0148 tepelnej roz\u0165a\u017enosti. V\u010faka t\u00fdmto schopnostiam je vhodn\u00fd na aplik\u00e1cie n\u00e1chyln\u00e9 na r\u00f4zne trecie sily, n\u00e1razy, er\u00f3ziu, oderu, vysok\u00e9 teploty a tepeln\u00e9 \u0161oky.<\/p>\n
\nTrieda materi\u00e1lu definuje vlastnosti r\u00f4znych zlo\u017eiek karbidu krem\u00edka. Napr\u00edklad v pr\u00edpade \u00faplne hust\u00e9ho kompozitu SIC-SI materi\u00e1l vykazuje vynikaj\u00facu pevnos\u0165 v ohybe pri izbovej teplote. T\u00fato vlastnos\u0165 si zachov\u00e1va a\u017e do teploty topenia krem\u00edka, ktor\u00e1 je 1410o C. Jeho Youngov modul sa pohybuje v rozmedz\u00ed 350 a\u017e 400 GPa.
\nNi\u017e\u0161ie s\u00fa uveden\u00e9 niektor\u00e9 k\u013e\u00fa\u010dov\u00e9 vlastnosti karbidu krem\u00edka:
\nKarbid krem\u00edka m\u00e1 vynikaj\u00facu schopnos\u0165 odol\u00e1va\u0165 \u0161irok\u00e9mu spektru kysel\u00edn a z\u00e1sad.
\nM\u00e1 dobr\u00fa odolnos\u0165 proti opotrebovaniu a oxid\u00e1cii.
\nMateri\u00e1l m\u00e1 dobr\u00fa schopnos\u0165 odol\u00e1va\u0165 oderu.
\nV\u010faka vysokej tepelnej vodivosti a n\u00edzkemu koeficientu tepelnej roz\u0165a\u017enosti m\u00e1 vynikaj\u00facu odolnos\u0165 proti tepeln\u00fdm \u0161okom.
\nSvoju pevnos\u0165 si zachov\u00e1va aj pri ve\u013emi vysok\u00fdch teplot\u00e1ch.
\nKarbid krem\u00edka m\u00e1 dobr\u00fa kontrolu rozmerov zlo\u017eit\u00fdch tvarov.<\/p>\n
\n1. Opotrebovan\u00e9 \u010dasti a axi\u00e1lne lo\u017eisk\u00e1
\nsisic sa vyzna\u010duje vynikaj\u00facou odolnos\u0165ou proti opotrebovaniu a kor\u00f3zii, vysokou tvrdos\u0165ou a pevnos\u0165ou pri vysok\u00fdch teplot\u00e1ch. V\u010faka t\u00fdmto vlastnostiam je ide\u00e1lny pre r\u00f4zne opotrebov\u00e1van\u00e9 komponenty, ako s\u00fa dosky, skrutky a obe\u017en\u00e9 koles\u00e1. \u010ealej ho m\u00f4\u017eete pou\u017ei\u0165 aj v axi\u00e1lnych lo\u017eisk\u00e1ch, ktor\u00e9 bud\u00fa ve\u013emi u\u017eito\u010dn\u00e9 na pren\u00e1\u0161anie extr\u00e9mne vysok\u00fdch za\u0165a\u017een\u00ed vo ve\u013emi zne\u010disten\u00fdch kvapalin\u00e1ch.
\nV\u010faka jeho k\u013e\u00fa\u010dov\u00fdm vlastnostiam m\u00f4\u017eu v\u00fdrobcovia vyr\u00e1ba\u0165 kompaktn\u00e9 lo\u017eisk\u00e1, ktor\u00e9 m\u00f4\u017eu pracova\u0165 v teplotnom rozsahu od -200o C do 400o C.
\n2. N\u00e1bytok pece a podporn\u00e9 komponenty
\nOdolnos\u0165 proti oxid\u00e1cii, odolnos\u0165 proti tepeln\u00fdm \u0161okom a odolnos\u0165 proti vysok\u00fdm teplot\u00e1m umo\u017e\u0148uj\u00fa spolo\u010dnostiam vyr\u00e1ba\u0165 podpery pre pece s n\u00edzkou hmotnos\u0165ou. Medzi r\u00f4zne v\u00fdrobky do pec\u00ed patria st\u013apiky, d\u00fdzy hor\u00e1kov, tenkostenn\u00e9 nosn\u00edky, nastavovacie zariadenia a valce.
\nTieto v\u00fdrobky pom\u00e1haj\u00fa pri \u00faspor\u00e1ch energie a pon\u00fakaj\u00fa mo\u017enos\u0165 r\u00fdchlej\u0161ieho prechodu v\u00fdrobkov zn\u00ed\u017een\u00edm tepelnej hmotnosti pecn\u00fdch voz\u0148ov. Pec na b\u00e1ze RBSC by v\u0161ak bola takmer \u0161tyrikr\u00e1t drah\u0161ia v porovnan\u00ed s kordieritom.
\n3. Presn\u00e9 komponenty
\nPo reakcii s kvapaln\u00fdm krem\u00edkom zaznamen\u00e1te zanedbate\u013ene mal\u00fa zmenu objemu. T\u00e1to vlastnos\u0165 v\u00e1m poskytuje vynikaj\u00facu kontrolu rozmerov zlo\u017eit\u00fdch tvarov. M\u00f4\u017eete napr\u00edklad vyr\u00e1ba\u0165 laserov\u00e9 zrkadlov\u00e9 polotovary, optick\u00e9 lavice a zariadenia na manipul\u00e1ciu s do\u0161ti\u010dkami. Tieto komponenty s\u00fa tuh\u00e9 a \u013eahk\u00e9 a maj\u00fa vynikaj\u00facu tepeln\u00fa stabilitu.<\/p>\n
\nReak\u010dne viazan\u00fd karbid krem\u00edka je materi\u00e1l, ktor\u00fd obsahuje pribli\u017ene 7 a\u017e 15% kovov\u00e9ho krem\u00edka, mal\u00e9 mno\u017estvo nezreagovan\u00e9ho uhl\u00edka a karbid krem\u00edka. Tieto materi\u00e1ly sa vyr\u00e1baj\u00fa pomocou r\u00f4znych procesov v z\u00e1vislosti od potreby kone\u010dn\u00e9ho v\u00fdrobku. Ak napr\u00edklad chcete vyr\u00e1ba\u0165 opotrebite\u013en\u00e9 s\u00fa\u010diastky, v\u00fdrobn\u00e9 procesy SiC-Si sa bud\u00fa l\u00ed\u0161i\u0165 od procesu, ktor\u00fd ste pou\u017eili na v\u00fdrobu presn\u00fdch s\u00fa\u010diastok. reak\u010dne viazan\u00fd karbid krem\u00edka je ide\u00e1lny pre aplik\u00e1cie na opotrebite\u013en\u00e9 s\u00fa\u010diastky, ako s\u00fa tlmivky na regul\u00e1ciu prietoku, potrubia a v\u00e4\u010d\u0161ie opotrebite\u013en\u00e9 s\u00fa\u010diastky. Ide o ekonomick\u00fd a spo\u013eahliv\u00fd materi\u00e1l pre mno\u017estvo aplik\u00e1ci\u00ed v\u010faka jeho vynikaj\u00facemu s\u00faboru vlastnost\u00ed.<\/p>","protected":false},"excerpt":{"rendered":"