Silicio karbidas (SiC) yra viena i\u0161 kie\u010diausi\u0173 keramini\u0173 med\u017eiag\u0173, i\u0161laikanti savo kietum\u0105 net ir esant auk\u0161tai temperat\u016brai, tod\u0117l pasi\u017eymi i\u0161skirtiniu atsparumu dilimui ir apsauga nuo korozijos. Be to, SiC pasi\u017eymi i\u0161skirtiniu atsparumu dilimui ir korozijai.<\/p>\n
Naudojant XRD ir SEM analiz\u0117s metodus, buvo \u012fvertinta skysta faze sukepinto SiC, kuriame yra \u012fvairi\u0173 sukepinim\u0105 aktyvinan\u010di\u0173 pried\u0173, mikrostrukt\u016bra. Be to, i\u0161tirtas j\u0173 poveikis lenkimo stiprumui kambario temperat\u016broje.<\/p>\n
Silicio karbidas (SiC) yra labai kieta med\u017eiaga, u\u017eimanti vidurini\u0105j\u0105 Mohso skal\u0117s dal\u012f tarp aliuminio oksido ir deimanto. SiC keramika paprastai pasi\u017eymi dideliu atsparumu temperat\u016brai ir oksidacijai, o tai yra svarbiausi daugelio pramon\u0117s sri\u010di\u0173 komponentai.<\/p>\n
Silicio karbido gamybos procesai paprastai apima reakcin\u012f sukepinim\u0105, kar\u0161t\u0105j\u012f presavim\u0105, sukepinim\u0105 dujiniu sl\u0117giu ir sukepinim\u0105 kar\u0161tuoju izostatiniu presu. Reakcinis sukepinimas turi daug privalum\u0173, palyginti su analogi\u0161kais procesais: visi\u0161ko tankio strukt\u016bra, ma\u017eesni apdorojimo temperat\u016bros reikalavimai, geros formos galimyb\u0117s ir grynumas. Reakcinis sukepinimas tapo pagrindiniu didelio dyd\u017eio ar sud\u0117tingos formos SiC keramikos gamybos metodu, nes gaminant suma\u017e\u0117ja matmen\u0173 poky\u010diai, kurie gali pakenkti jos eksploatacin\u0117ms savyb\u0117ms auk\u0161toje temperat\u016broje.<\/p>\n
Tyrimai atskleid\u0117, kad didelio stiprio reakcijos sukepintos SiC keramikos atsparumas lenkimui kambario temperat\u016broje siekia iki 1400 MPa - tai viena did\u017eiausi\u0173 ver\u010di\u0173 tarp neoksidini\u0173 keramini\u0173 med\u017eiag\u0173.<\/p>\n
Skystosios faz\u0117s sukepinimas yra dar vienas silicio karbido gamybos b\u016bdas. \u0160io proceso metu silicio karbido milteliai su neoksidin\u0117mis sukepinimo pagalbin\u0117mis med\u017eiagomis infiltruojami \u012f skyst\u0105 silic\u012f, kuris reaguoja su anglimi, kad susidaryt\u0173 daugiau SiC - gaunamas tankesnis produktas, pasi\u017eymintis puikiomis mechanin\u0117mis savyb\u0117mis, ta\u010diau brangesnis; \"Saint-Gobain\" si\u016blo \u0161i\u0105 r\u016b\u0161\u012f pavadinimu \"CarSiK-NG\".<\/p>\n
Silicio karbido keramika yra labai atspari korozijai. Ji puikiai atspari daugeliui r\u016bg\u0161\u010di\u0173 (druskos, sieros, vandenilio ir vandenilio fluorido r\u016bg\u0161tims), taip pat \u0161armams (visoms baz\u0117ms, i\u0161skyrus \u0161armines) ir tirpikliams; be to, d\u0117l atsparumo azoto r\u016bg\u0161\u010diai \u0161i keramika ypa\u010d atspari dilimui auk\u0161tesn\u0117je temperat\u016broje, kartu i\u0161laikydama kietum\u0105 ir tvirtum\u0105 vis\u0105 savo gyvavimo cikl\u0105.<\/p>\n
Be sl\u0117gio sukepintas silicio karbidas yra itin tanki med\u017eiaga, pasi\u017eyminti puikiomis mechanin\u0117mis savyb\u0117mis, pavyzd\u017eiui, dideliu atsparumu lenkimui ir geru atsparumu \u0161liau\u017eimui. Be to, jo pavir\u0161ius labai atsparus dilimui ir korozijai, taip pat daugeliui chemini\u0173 med\u017eiag\u0173, pavyzd\u017eiui, r\u016bg\u0161tims ir \u0161armams.<\/p>\n
Reakcijos b\u016bdu suri\u0161tas silicio karbidas skiriasi nuo SSiC stambesniais gr\u016bdeliais ir ma\u017eesniu atsparumu lenkimui, gaminamas infiltruojant i\u0161lydyt\u0105 silic\u012f \u012f akytas anglies ar grafito ruo\u0161inius ir naudojant skirtingus sukepinimo priedus, kurie sukuria skirtingas chemines ir morfologines savybes.<\/p>\n
SSiC su MgO turi kristalin\u0119 strukt\u016br\u0105 ir pasi\u017eymi didesniu atsparumu korozijai nei jo konkurentas RBSIC, pagamintas su Y2O3, ta\u010diau jo gamyba yra daug pigesn\u0117, tod\u0117l jis labiau tinka tam tikroms reikm\u0117ms, kai norima auk\u0161t\u0173 eksploatacini\u0173 savybi\u0173 u\u017e priimtinesn\u0119 kain\u0105. Nepaisant \u0161i\u0173 s\u0105naud\u0173 prana\u0161um\u0173, daugelis renkasi SSiC d\u0117l jo i\u0161skirtinio \u0161iluminio atsparumo auk\u0161tesn\u0117je temperat\u016broje ir puiki\u0173 tribologini\u0173 savybi\u0173 - da\u017enai jis naudojamas didel\u0117ms besid\u0117vin\u010dioms dalims, pavyzd\u017eiui, sandarikliams ir guoliams.<\/p>\n
Silicio karbidas yra itin stabili keramika auk\u0161toje temperat\u016broje, pasi\u017eyminti i\u0161skirtiniu atsparumu terminiams sm\u016bgiams, taip pat atsparumu cheminei korozijai ir oksidacijai, tod\u0117l ji tinka naudoti \u012fvairiose aplinkose ir \u012fvairiose srityse.<\/p>\n
Sukepintas silicio karbidas i\u0161 konkurent\u0173 i\u0161siskiria i\u0161skirtiniu kietumu ir atsparumu dilimui, o terminis stabilumas leid\u017eia jam atlaikyti auk\u0161t\u0105 temperat\u016br\u0105, nesuardant ir nekei\u010diant formos - \u0161ios dvi unikalios savyb\u0117s leid\u017eia j\u012f naudoti \u012fvairiose pramon\u0117s \u0161akose, pavyzd\u017eiui, puslaidininki\u0173 gamybos \u012frangos dalims, metalurgijos komponentams, skirtiems aviacijos ir kosmoso varikliams, ir branduolini\u0173 reaktori\u0173 konstrukcin\u0117ms med\u017eiagoms.<\/p>\n
Sukepintas silicio karbidas (SSiC) gaminamas presuojant ir sukepinant silicio karbido miltelius. Sukepinant milteliai kaitinami auk\u0161toje temperat\u016broje, kad susiliet\u0173 \u012f vien\u0105 tanki\u0105 mas\u0119, pasi\u017eymin\u010di\u0105 ne\u012ftik\u0117tinu tvirtumu, atspari\u0105 oksidacijai, dilimui ir \u012ftr\u016bkimams.<\/p>\n
Reakcijos b\u016bdu suri\u0161tas silicio karbidas (RBSiC) gaminamas reaguojant akytai anglies \u017ealiavai su i\u0161lydytu siliciu duj\u0173 arba skys\u010dio faz\u0117se, gaunant galutin\u012f produkt\u0105, pasi\u017eymint\u012f didelio tankio keramika, pasi\u017eymin\u010di\u0105 i\u0161skirtin\u0117mis mechanin\u0117mis savyb\u0117mis ekstremaliose galutinio naudojimo temperat\u016brose iki 1400 laipsni\u0173 Celsijaus. \"Saint-Gobain Performance Ceramics & Refractories\" si\u016blo dviej\u0173 form\u0173 RBSiC, skirt\u0105 apsaugoti nuo dabartini\u0173 ir nauj\u0173 balistini\u0173 gr\u0117smi\u0173: Hexoloy SA SiC si\u016blo puik\u0173 atsparum\u0105 chemin\u0117ms med\u017eiagoms ir dilimui \u012fvairiose aplinkose, o CarSiK-NG SiC si\u016blo be sl\u0117gio sukepint\u0105 RBSiC, skirt\u0105 naudoti prie\u0161 dabartines balistines gr\u0117smes; abi r\u016b\u0161ys gali u\u017etikrinti patikim\u0105 balistin\u0119 apsaug\u0105 nuo dabartini\u0173 balistini\u0173 gr\u0117smi\u0173, taip pat apsaugoti nuo dabartini\u0173 balistini\u0173 gr\u0117smi\u0173; Hexoloy SA SiC gali pasi\u016blyti be sl\u0117gio sukepint\u0105 RBSiC, nes Hexoloy SA SiC si\u016blo be sl\u0117gio sukepint\u0105 RBSiC formas; taip u\u017etikrinamas i\u0161skirtinis atsparumas chemin\u0117ms med\u017eiagoms ir dilimui \u012fvairiose aplinkose, palyginti su savo analogu CarSiK-NG SiC pasi\u017eymi i\u0161skirtiniu atsparumu chemin\u0117ms med\u017eiagoms ir dilimui \u012fvairiose aplinkose, o Hexoloy SA SiC si\u016blo be sl\u0117gio sukepint\u0105 sukepint\u0105 form\u0105, kuri pasi\u017eymi i\u0161skirtiniu atsparumu cheminiam dilimui, palyginti su savo analogu CarSiK-NG SiC. CarSiK-NG SiK-NG SiK-NG SiK-NG SiK-NG SiK-NG SiK-NG SiK-NG si\u016blo be sl\u0117gio sukepint\u0105 form\u0105 si\u016blo be sl\u0117gio sukepint\u0105 Hexoy SA SiC be sl\u0117gio Hexoy SA SiC be sl\u0117gio RBSiK-NG SiC taip pat sukurta taip, kad atitikt\u0173 dabartines ir kylan\u010dias balistini\u0173 gr\u0117smi\u0173 gr\u0117smes: Hexoy Performance Ceramics Refractories si\u016blo abiej\u0173 tip\u0173, kuriuos galima \u012fsigyti i\u0161 Saint Gobain Performance Ceramics Refractories Performance Ceramics Refractories Performance Ceramics Refractories Performance Ceramics Refractories Performance Ceramics Refractories Performance Ceramics Refractories si\u016blo Hexoloy SA SiK-NG balistin\u0117ms gr\u0117sm\u0117ms, o CarSiK-NG SiC tiek kaip apsaug\u0105 nuo CarSiK-NG SiC abu si\u016blo i\u0161skirtin\u012f atsparum\u0105 cheminiam nusid\u0117v\u0117jimui nuo dabartini\u0173 ir atsirandan\u010di\u0173 balistini\u0173 gr\u0117smi\u0173, o CarSiK-NG SiC si\u016blo CarSiK-NG abu tipai gali abu CarSiK-NG SiC si\u016blo abu si\u016blomi yra skirti CarSiK-NG gamins 2NG teikia CarSiKNG SiKNG si\u016blo CarSiKNG si\u016blo CarSiKNG si\u016blo dvi veisles, skirtas Car SiK-NGNG si\u016blo dviej\u0173 form\u0173 RBSiK-NG yra suprojektuoti CarSiK-NG siCar ugniai atsparioms med\u017eiagoms CarSiK-NG si\u016blo CarSiK-NG SiCarSiK-NG SiCarSiK-NG SiCarSiK-NG SiK Refrac apsaugoti CarSiK-NG SiK-NG SiCar, nes abu yra abu produktai suprojektuoti Car SiK NG, kuri\u0173 abi formos si\u016blomos kaip apsauga nuo CarSiK-NG SiK-NG SiK-NG CarSiKNG CarSiK-NG SiC apsaugai nuo CarSiK-NG SiK-NG SI KNG NG SiK-NG SiK-NG SiK-NG SiK-NG si\u016blo dvi formas CarSiK-NG SiK-NG si\u016blo i\u0161skirtin\u012f atsparum\u0105 cheminiam dilimui HexoloYRa NG SIKC taip pat u\u017etikrina veiksmingesn\u0119 apsaug\u0105 nuo CarSiK-NG SIKC apsaugai SiK-NG SiC u\u017e<\/p>\n
Silicio karbidas yra ideali med\u017eiaga mechaninei in\u017einerijai d\u0117l savo i\u0161skirtinio kietumo, standumo ir \u0161ilumos laidumo savybi\u0173. Be to, jis chemi\u0161kai inerti\u0161kas, jo pl\u0117timosi koeficientas ma\u017eas, jis apdirbamas \u012fprastais keraminiais \u012frankiais - d\u0117l vis\u0173 \u0161i\u0173 savybi\u0173 j\u012f galima naudoti puslaidininki\u0173 gamybos \u012frangos dalims, optini\u0173 veidrod\u017ei\u0173 \u012ftaisams kosmin\u0117se misijose, taip pat strukt\u016brin\u0117ms med\u017eiagoms branduolin\u0117s sintez\u0117s reaktoriuose. Gaminamas naudojant \u012fvairius procesus, pavyzd\u017eiui, sukepinim\u0105 susl\u0117gtomis dujomis, kar\u0161t\u0105 izostatin\u012f presavim\u0105, reakcin\u012f sukepinim\u0105 arba chemin\u012f nusodinim\u0105 i\u0161 gar\u0173; reakcinis sukepinimas i\u0161siskiria tuo, kad gaminamos i\u0161tisin\u0117s denseno strukt\u016bros, naudojant ma\u017eesn\u0119 apdorojimo temperat\u016br\u0105 nei kiti sukepinimo procesai sukepinimo b\u016bdai sukepinant gaunamos i\u0161tisin\u0117s denseno strukt\u016bros, palyginti su kitais sukepinimo procesais, d\u0117l kuri\u0173 gaunamos i\u0161tisin\u0117s denseno strukt\u016bros su i\u0161tisin\u0117mis denseno strukt\u016bromis, pagamintomis naudojant ma\u017eesn\u0119 apdorojimo temperat\u016br\u0105, reikaling\u0105 apdorojimo temperat\u016br\u0105 nei kiti naudojami sukepinimo procesai.<\/p>\n
Siekiant padidinti sukepinto silicio karbido stiprum\u0105, buvo sukurtas sukepinto silicio karbido sukepinimas be sl\u0117gio, \u012f sukepinimo mi\u0161in\u012f pridedant boro ir anglies, taip suma\u017einant gr\u016bdeli\u0173 pavir\u0161iaus energij\u0105. Palyginti su tradiciniais kietosios faz\u0117s sukepinimo procesais, sukepinimas be sl\u0117gio leid\u017eia iki 99% sutank\u0117ti ir kartu slopina gr\u016bdeli\u0173 augim\u0105, tod\u0117l padid\u0117ja sukepint\u0173 k\u016bn\u0173 atsparumas l\u016b\u017eiams. Ta\u010diau, deja, \u0161is metodas yra brangus ir sud\u0117tingas naudoti, o d\u0117l ribot\u0173 gamini\u0173 dyd\u017ei\u0173 ir form\u0173 jo pritaikomumas yra ribotas atsi\u017evelgiant \u012f pramon\u0117s reikalavimus.<\/p>\n
Reakcinio sukepinimo b\u016bdu buvo gaminami mezokarbono mikrogranuli\u0173 ir silicio karbido (MCMB-SiC) kompozitai, kuri\u0173 sud\u0117tyje MCMB dalel\u0117s sudaro 0-30 mas\u0117s procent\u0173, ir vertinamos j\u0173 tribologin\u0117s savyb\u0117s. Atsparumas dilimui did\u0117jo, o trinties koeficiento kreiv\u0117 rod\u0117 ma\u017e\u0117jimo tendencij\u0105 did\u0117jant bandymo laikui; \u0161\u012f pager\u0117jim\u0105 galima paai\u0161kinti MCMB daleli\u0173 sukeltu tepimo pl\u0117veli\u0173 susidarymu ant slydimo pavir\u0161i\u0173.<\/p>","protected":false},"excerpt":{"rendered":"
Silicon carbide (SiC) is one of the hardest ceramic materials and retains its hardness even at elevated temperatures, offering exceptional wear-resistance and corrosion protection. Additionally, SiC offers exceptional resistance against wear-and-corrosion damage. By employing XRD and SEM analysis techniques, the microstructure of liquid-phase sintered SiC containing various sintering activating additives was evaluated. Furthermore, its impact […]<\/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":"","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":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","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":[64],"tags":[],"class_list":["post-226","post","type-post","status-publish","format-standard","hentry","category-knowledge"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/ceramicatijolart.com\/lt\/wp-json\/wp\/v2\/posts\/226","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ceramicatijolart.com\/lt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ceramicatijolart.com\/lt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ceramicatijolart.com\/lt\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ceramicatijolart.com\/lt\/wp-json\/wp\/v2\/comments?post=226"}],"version-history":[{"count":1,"href":"https:\/\/ceramicatijolart.com\/lt\/wp-json\/wp\/v2\/posts\/226\/revisions"}],"predecessor-version":[{"id":227,"href":"https:\/\/ceramicatijolart.com\/lt\/wp-json\/wp\/v2\/posts\/226\/revisions\/227"}],"wp:attachment":[{"href":"https:\/\/ceramicatijolart.com\/lt\/wp-json\/wp\/v2\/media?parent=226"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ceramicatijolart.com\/lt\/wp-json\/wp\/v2\/categories?post=226"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ceramicatijolart.com\/lt\/wp-json\/wp\/v2\/tags?post=226"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}