Silicio karbidas (karborundas) yra kieta med\u017eiaga - vos \u017eemiau deimanto pagal Moho skal\u0119, randama juod\u0173 arba tamsiai \u017eali\u0173 kristal\u0173 pavidalo.<\/p>\n
Itin kieta abrazyvin\u0117 med\u017eiaga, naudojama spalvotiesiems metalams ir keramikai \u0161lifuoti. Taip pat tinka \u0161lifavimui, uolien\u0173 \u0161lifavimui ir sm\u0117liavimui.<\/p>\n
Silicio karbidas (SiC) - nepakartojamai kietas kovalentinis junginys, sudarytas i\u0161 anglies ir silicio atom\u0173, pagal kietum\u0105 Moho skal\u0117je u\u017eima antr\u0105 viet\u0105 po deimanto ir kubinio boro nitrido.<\/p>\n
D\u0117l savo abrazyvini\u0173 savybi\u0173 deimantiniai \u0161lifavimo diskai idealiai tinka spalvotiesiems metalams, keramikai ir stiklo pavir\u0161iams \u0161lifuoti ir poliruoti. Be to, deimantiniai poliravimo diskai taip pat da\u017enai naudojami aviacijos ir automobili\u0173 pramon\u0117je kaip metalurgini\u0173 komponent\u0173 \u0161lifavimo b\u016bdas.<\/p>\n
Juodasis SiC yra trapus, tod\u0117l j\u012f galima daug kart\u0173 perdirbti naudojant uolien\u0173 trintuvus. Laikui b\u0117gant jo sudedamosios dalys suskyla ir mikro\u012ftr\u016bksta, tod\u0117l atsiranda nauj\u0173 a\u0161tri\u0173 briaun\u0173, kurios naudojamos geresn\u0117ms \u0161lifavimo ir poliravimo operacijoms.<\/p>\n
SiC i\u0161siskiria tarp kiet\u0173j\u0173 med\u017eiag\u0173 ypatingu kietumu, unikaliomis savyb\u0117mis ir geb\u0117jimu greitai ir efektyviai \u0161lifuoti plien\u0105, palyginti su aliuminio oksidu (ruduoju lydytuoju aliuminio oksidu) ar kitomis nat\u016braliomis abrazyvin\u0117mis med\u017eiagomis, pavyzd\u017eiui, B4C. Be to, SiC pasi\u017eymi geresn\u0117mis termin\u0117mis savyb\u0117mis nei B4C, tod\u0117l yra geresnis pasirinkimas naudoti esant auk\u0161tai temperat\u016brai.<\/p>\n
Silicio karbidas (SiC) yra tvirta, ilgaam\u017e\u0117 keramin\u0117 med\u017eiaga, pla\u010diai naudojama \u012fvairiose pramon\u0117s \u0161akose d\u0117l savo kietumo ir kit\u0173 pageidaujam\u0173 savybi\u0173, pavyzd\u017eiui, cheminio inerti\u0161kumo, didelio \u0161iluminio laidumo, ma\u017eo pl\u0117timosi koeficiento, temperat\u016bros stabilumo ir atsparumo korozijai bei dilimui.<\/p>\n
SiC pasi\u017eymi puikiu mechaniniu atsparumu, dideliu tempimo ir gniu\u017edymo stipriu ir \u012fsp\u016bdinga Youngo modulio verte. Be to, jis yra atsparus r\u016bg\u0161tims ir \u0161armams ir pasi\u017eymi puikiomis atsparumo terminiams sm\u016bgiams savyb\u0117mis.<\/p>\n
SiC pla\u010diai naudojamas ne tik kaip abrazyvin\u0117 med\u017eiaga \u0161vitriniam popieriui ir \u0161lifavimo diskams, bet ir \u012fvairioms kitoms reikm\u0117ms, \u012fskaitant pramonini\u0173 krosni\u0173 \u012fd\u0117klus, pjovimo \u012frankius, dilimui atsparias siurbli\u0173 ir raket\u0173 varikli\u0173 dalis, puslaidininkinius \u0161viesos diod\u0173 (LED) substratus, taip pat puslaidininkinius \u0161viesos diod\u0173 (LED) substratus. \u017daliasis SiC paprastai pasi\u017eymi didesniu grynumu nei juodasis SiC, skirtas tiksliojo \u0161lifavimo ir (arba) poliravimo reikm\u0117ms, taip pat puslaidininki\u0173 substrat\u0173 reikm\u0117ms; abi r\u016b\u0161ys turi unikali\u0173 privalum\u0173, palyginti su kita keramika, pavyzd\u017eiui, aliuminio oksidu ir cirkonio oksidu, d\u0117l kietumo, \u0161ilumos laidumo ir atsparumo l\u016b\u017eiams charakteristik\u0173, taip pat d\u0117l puslaidininki\u0173 substrat\u0173 naudojimo, palyginti su kita keramika, pavyzd\u017eiui, aliuminio oksidu ir cirkonio oksidu, d\u0117l kietumo, \u0161ilumos laidumo ir atsparumo l\u016b\u017eiams charakteristik\u0173, palyginti su kita keramika, pavyzd\u017eiui, aliuminio oksidu ir cirkonio oksidu, d\u0117l kietumo, \u0161ilumos laidumo ir atsparumo l\u016b\u017eiams charakteristik\u0173. palyginti su kita keramika, pavyzd\u017eiui, aliuminio oksidu \/ cirkoniu, kuriai kita keramika negali prilygti d\u0117l savo geresni\u0173 eksploatacini\u0173 savybi\u0173, toki\u0173 kaip kietumas \/ \u0161iluminis laidumas \/ atsparumas l\u016b\u017eiams \/ atsparumas l\u016b\u017eiams, palyginti su kita keramika, pavyzd\u017eiui, aliuminio oksidu \/ cirkoniu, d\u0117l kietumo \/ \u0161iluminio laidumo \/ atsparumo l\u016b\u017eiams \/ atsparumo l\u016b\u017eiams \/ atsparumo l\u016b\u017eiams eksploatacini\u0173 savybi\u0173 \/ atsparumo l\u016b\u017eiams \/ atsparumo l\u016b\u017eiams.ness performance characteristics alum \/ Circonia\/zirconia\/fractoughness performance\/fracture toughness\/frconia in terms of hardness\/fractalusive in terms of hardness\/thermal conductivity\/frac toughness\/fracture toughness\/fracture toughness\/fracture toughness etc vs etc... ZIN (I\/cirkonis+ l\u016b\u017eio tvirtumas ir t. t.). vs==f =5=conia=5. Si=4. ZIN=1<\/p>\n
Silicio karbidas (SiC) yra viena lengviausi\u0173, kie\u010diausi\u0173 ir tvir\u010diausi\u0173 pa\u017eangi\u0173j\u0173 keramik\u0173, esan\u010di\u0173 dabartin\u0117je rinkoje. Jis pasi\u017eymi puikiu \u0161ilumos laidumu, taip pat yra labai atsparus r\u016bg\u0161tims ir \u0161armams, atlaiko iki 1400 laipsni\u0173 C temperat\u016br\u0105, ta\u010diau jo tvirtumas ir eksploatacin\u0117s savyb\u0117s nesuma\u017e\u0117ja.<\/p>\n
D\u0117l ne\u012ftik\u0117tino kietumo kevlaro(r) med\u017eiaga pla\u010diai naudojama neper\u0161aunamoms liemen\u0117ms gaminti. Be to, \u0161is patvarus audinys pasi\u017eymi i\u0161skirtin\u0117mis atsparumo dilimui ir erozijai savyb\u0117mis, tod\u0117l yra puikus med\u017eiagos pasirinkimas purk\u0161tukams, ciklonams ir pur\u0161kimo komponentams gaminti.<\/p>\n
SiC atsparum\u0105 chemin\u0117ms med\u017eiagoms galima dar labiau padidinti naudojant papildomas priemai\u0161as, pavyzd\u017eiui, boro ir aliuminio doping\u0105; dopingas boro priemai\u0161omis tampa p tipo puslaidininkiu, o dopingas aliuminio priemai\u0161omis - n tipo puslaidininkiu.<\/p>\n
Silicio karbido mechanin\u0117s savyb\u0117s gali b\u016bti labai pagerintos, kai jis padengiamas atomi\u0161kai plona epitaksine grafeno danga. Berkovi\u010diaus deimanto \u012fdubimo bandymai atskleid\u0117, kad j\u012f padengus grafenu, kietumas padid\u0117ja iki 30% - esant \u012fdubimams iki 175 nanometr\u0173 gylyje; manoma, kad \u0161\u012f rei\u0161kin\u012f lemia diameno susidarymas d\u0117l \u012fdubimo metu indentoriaus taikomo sl\u0117gio.<\/p>\n
Silicio karbidas yra i\u0161skirtinai kieta ir patvari med\u017eiaga, pasi\u017eyminti labai ma\u017eu \u0161iluminiu pl\u0117timusi ir dideliu \u0161iluminiu laidumu, tod\u0117l tinka naudoti esant dideliems temperat\u016bros svyravimams.<\/p>\n
SiC atlaiko auk\u0161t\u0105 temperat\u016br\u0105, yra atsparus chemini\u0173 ir branduolini\u0173 proces\u0173 sukeliamam irimui ir yra elektrinis puslaidininkis, pasi\u017eymintis naudingomis elektrin\u0117mis savyb\u0117mis.<\/p>\n
Edvardas G. Achesonas pirm\u0105 kart\u0105 karborund\u0105 susintetino 1891 m. bandydamas sintetinti sintetinius deimantus, naudodamas savo paties sukurt\u0105 kiet\u0173 \u017eali\u0173 kristal\u0173 i\u0161 silicio milteli\u0173 ir anglies reakcij\u0173 k\u016brimo proces\u0105, pavadindamas savo k\u016brin\u012f karborundu lotyni\u0161ku pavadinimu corundum - taip vadinami tokie reti brangakmeniai kaip korundas.<\/p>\n
Reakcijos b\u016bdu suri\u0161tas silicio karbidas gaminamas sumai\u0161ant SiC miltelius su plastifikatoriumi ir suformuojant form\u0105, o po to v\u0117l reaguojant su dujiniu arba skystu siliciu, kad susidaryt\u0173 papildomas SiC. Kita vertus, tiesiogiai sukepintas silicio karbidas pasi\u017eymi smulkesniais gr\u016bdeliais ir ma\u017eesn\u0117mis gamybos s\u0105naudomis, o jo mechaninis atsparumas kambario temperat\u016broje yra didesnis nei 300 laipsni\u0173 C.<\/p>","protected":false},"excerpt":{"rendered":"
Silicon carbide (carborundum) is a hard material – just below diamond on the Mohs scale of mineral hardness – found in black or dark green crystal form. An extremely hard abrasive material used for grinding nonferrous metals and ceramics. Also suitable for sanding, rock tumbling and sandblasting applications. Abrasive Properties Silicon carbide (SiC), an irreducibly […]<\/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-144","post","type-post","status-publish","format-standard","hentry","category-knowledge"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/ceramicatijolart.com\/lt\/wp-json\/wp\/v2\/posts\/144","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=144"}],"version-history":[{"count":1,"href":"https:\/\/ceramicatijolart.com\/lt\/wp-json\/wp\/v2\/posts\/144\/revisions"}],"predecessor-version":[{"id":145,"href":"https:\/\/ceramicatijolart.com\/lt\/wp-json\/wp\/v2\/posts\/144\/revisions\/145"}],"wp:attachment":[{"href":"https:\/\/ceramicatijolart.com\/lt\/wp-json\/wp\/v2\/media?parent=144"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ceramicatijolart.com\/lt\/wp-json\/wp\/v2\/categories?post=144"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ceramicatijolart.com\/lt\/wp-json\/wp\/v2\/tags?post=144"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}