![\"reakcija](\"http:\/\/siliconcarbideceramic.net\/wp-content\/uploads\/2024\/02\/reaction-bonded-sic.jpg\")
<\/p>","protected":false},"excerpt":{"rendered":"Sil\u012bcija karb\u012bds ir viens no ciet\u0101kajiem un iztur\u012bg\u0101kajiem progres\u012bvajiem keramikas materi\u0101liem, ko izmanto gan k\u0101 abraz\u012bvu materi\u0101lu, gan karstumiztur\u012bbas un zema termisk\u0101s izple\u0161an\u0101s koeficienta d\u0113\u013c ugunsiztur\u012bgajos materi\u0101los un keramik\u0101.<\/p>\n
Moisan\u012bts var b\u016bt sastopams ar\u012b dab\u0101 k\u0101 caursp\u012bd\u012bgs miner\u0101ls moisan\u012bts. Pirmie m\u0101ksl\u012bgi sintez\u0113tie paraugi tika rad\u012bti 1891. gad\u0101 Edvarda A\u010dsona m\u0113\u0123in\u0101juma laik\u0101 rad\u012bt m\u0101ksl\u012bgos dimantus; v\u0113l\u0101k Nobela pr\u0113mijas laure\u0101ts \u0137\u012bmi\u0137is Anr\u012b Mois\u0101ns m\u0101ksl\u012bgi sintez\u0113ja vair\u0101k paraugu.<\/p>\n
Sil\u012bcija karb\u012bds (SiC) ir \u0101rk\u0101rt\u012bgi iztur\u012bga bezoks\u012bda keramika, kas nodro\u0161ina izcilu iztur\u012bbu pret koroziju un \u0137\u012bmisko iedarb\u012bbu paaugstin\u0101t\u0101 temperat\u016br\u0101. SiC tiek izmantots k\u0101 ugunsiztur\u012bgs oder\u0113juma materi\u0101ls r\u016bpnieciskaj\u0101s kr\u0101sn\u012bs k\u0101 ugunsiztur\u012bgs oder\u0113juma materi\u0101ls, sl\u012bp\u0113\u0161anas diskiem, griez\u0113jinstrumentiem un lietojumiem, kur iztur\u012bba ir b\u016btiska, piem\u0113ram, sl\u012bp\u0113\u0161anas diskiem, griez\u0113jinstrumentiem un apstr\u0101des iek\u0101rt\u0101m. Turkl\u0101t SiC komponenti veido galven\u0101s da\u013cas pretest\u012bbas sildelementos, termistorus elektriskaj\u0101m kr\u0101sn\u012bm, k\u0101 ar\u012b SiC saturo\u0161as oder\u0113juma caurules un bl\u012bv\u0113juma virsmas.<\/p>\n
SiC ir paz\u012bstams ar savu izcilo termisko pretest\u012bbu un iztur\u012bbu paaugstin\u0101t\u0101 temperat\u016br\u0101, t\u0101p\u0113c tas ir \u013coti nov\u0113rt\u0113ts r\u016bpnieciskajos lietojumos. SiC ir iztur\u012bgs pret oksid\u0113\u0161anos temperat\u016br\u0101 l\u012bdz 1000 gr\u0101diem C, veidojot oks\u012bda aizsargsl\u0101ni, kas darbojas k\u0101 barjera starp t\u0101 virsm\u0101m un elementiem, kurus t\u0101s ieskauj; tom\u0113r augst\u0101k\u0101s temperat\u016br\u0101s plaisas var iek\u013c\u016bt \u0161aj\u0101 barjer\u0101 un izklied\u0113t ener\u0123iju caur starpkrist\u0101lu vai granulu apgabaliem, k\u0101 rezult\u0101t\u0101 paaugstin\u0101t\u0101 temperat\u016br\u0101 ir gr\u016bti palielin\u0101t iztur\u012bbu.<\/p>\n
Sil\u012bcija karb\u012bdu var izgatavot divos at\u0161\u0137ir\u012bgos procesos: reakcijas saist\u012b\u0161anas un sa\u0137epin\u0101\u0161anas proces\u0101. Abas formas b\u016btiski ietekm\u0113 t\u0101 mikrostrukt\u016bru un l\u012bdz ar to ar\u012b veiktsp\u0113ju paaugstin\u0101t\u0101 temperat\u016br\u0101. Reakcijas saist\u012b\u0161ana ietver za\u013co kompaktu, kas sast\u0101v no SiC un oglek\u013ca mais\u012bjumiem, infiltr\u0113\u0161anu ar \u0161\u0137idro sil\u012bciju; t\u0101 tiek rad\u012btas strukt\u016bras ar minim\u0101l\u0101m izm\u0113ru izmai\u0146\u0101m apstr\u0101des laik\u0101 un pla\u0161u virsmas laukumu. Ugunsiztur\u012bg\u0101 serdes-apvalka mikrostrukt\u016bra nodro\u0161ina unik\u0101las \u012bpa\u0161\u012bbas, kas, k\u0101 pier\u0101d\u012bts, palielina SiC iztur\u012bbu paaugstin\u0101t\u0101s temperat\u016br\u0101s.<\/p>\n
Sil\u012bcija karb\u012bda iev\u0113rojam\u0101 iztur\u012bba padara to par lielisku materi\u0101lu, ko var izmantot augst\u0101s temperat\u016br\u0101s, piem\u0113ram, keramikas brem\u017eu klu\u010dos automobi\u013ciem. \u0160is materi\u0101ls sp\u0113j iztur\u0113t temperat\u016bru l\u012bdz pat 1400 gr\u0101diem p\u0113c Celsija, vienlaikus saglab\u0101jot izcilu iztur\u012bbu un ciet\u012bbu, kas padara sil\u012bcija karb\u012bdu par ide\u0101lu materi\u0101lu.<\/p>\n
Sil\u012bcija karb\u012bds at\u0161\u0137iras no citiem keramikas materi\u0101liem ar to, ka tas nesadegrad\u0113 un nekustas augst\u0101 temperat\u016br\u0101, t\u0101p\u0113c ir piem\u0113rots izmanto\u0161anai augstas slodzes apst\u0101k\u013cos, kas rada lielu slodzi, piem\u0113ram, gult\u0146os un lo\u017eu pl\u0101ksn\u0113s, neradot neatgriezeniskus struktur\u0101lus boj\u0101jumus. Tas padara sil\u012bcija karb\u012bdu \u012bpa\u0161i ide\u0101li piem\u0113rotu lietojumiem, kas saist\u012bti ar augstu slodzes slodzi, piem\u0113ram, gult\u0146iem un lo\u017eu pl\u0101tn\u0113m.<\/p>\n
Sil\u012bcija karb\u012bds dab\u0101 sastopams k\u0101 \u0101rk\u0101rt\u012bgi retais miner\u0101ls moizan\u012bts, savuk\u0101rt sint\u0113tisk\u0101 sic ra\u017eo\u0161ana atbilst m\u016bsdienu valsts aizsardz\u012bbas, kodolener\u0123\u0113tikas, kosmosa tehnolo\u0123iju un kosmisk\u0101s avi\u0101cijas nozares pras\u012bb\u0101m, kur\u0101s ir nepiecie\u0161ami prec\u012bzi izm\u0113ri.<\/p>\n
Sinter\u0113tajam sil\u012bcija karb\u012bdam ir viena no augst\u0101kaj\u0101m siltumvad\u012btsp\u0113ju \u012bpa\u0161\u012bb\u0101m tehnisk\u0101s keramikas vid\u016b, kas ir otr\u0101 viet\u0101 aiz alum\u012bnija nitr\u012bda. To var izskaidrot ar t\u0101 sk\u0101bek\u013ca re\u017e\u0123a strukt\u016bru, kas rada lielu fononu izkliedi. Lai gan t\u0101 siltumvad\u012btsp\u0113ju var v\u0113l vair\u0101k palielin\u0101t, sa\u0137epin\u0101\u0161anas procesos izmantojot oks\u012bdu piedevas, t\u0101s ir j\u0101samazina l\u012bdz absol\u016btam minimumam, lai saglab\u0101tu materi\u0101la struktur\u0101lo stabilit\u0101ti un iztur\u012bbu pret oksid\u0101ciju.<\/p>\n
Sil\u012bcija karb\u012bda zemais termisk\u0101s izple\u0161an\u0101s koeficients padara to par ide\u0101lu materi\u0101lu, ko var izmantot k\u0101 keramikas matricas kompoz\u012btu (CMC) skarbos apst\u0101k\u013cos, t\u0101p\u0113c to pla\u0161i izmanto t\u0101dos lietojumos k\u0101 g\u0101zes turb\u012bnas un ra\u0137e\u0161u sprauslas, kur materi\u0101liem j\u0101iztur augstas temperat\u016bras, k\u0101 ar\u012b termiskie \u0161oki.<\/p>\n
Notur\u012bba pret koroziju padara ner\u016bs\u0113jo\u0161o t\u0113raudu par lielisku materi\u0101lu izv\u0113li \u0137\u012bmisk\u0101s r\u016bpniec\u012bbas kr\u0101\u0161\u0146u oder\u0113jumam, jo tas var iztur\u0113t ekstrem\u0101las temperat\u016bras, vienlaikus saglab\u0101jot struktur\u0101lo integrit\u0101ti. Turkl\u0101t ner\u016bs\u0113jo\u0161ais t\u0113rauds ir \u013coti \u0137\u012bmiski notur\u012bgs, \u013caujot ilgsto\u0161i darboties t\u0101d\u0101s nelabv\u0113l\u012bg\u0101s \u0161\u0137idr\u0101s vid\u0113s k\u0101 sk\u0101bes un s\u0101rmu \u0161\u0137\u012bdumi.<\/p>\n
Silicija karb\u012bda visizplat\u012bt\u0101kais polimorfs, alfa forma, ir sastopams temperat\u016br\u0101 virs 1700 gr\u0101diem p\u0113c C ar virtz\u012bta krist\u0101lisko strukt\u016bru un ku\u0161anas temperat\u016bru virs 1700 gr\u0101diem p\u0113c C. Tom\u0113r var past\u0101v\u0113t ar\u012b ret\u0101ka beta forma ar cinka blende krist\u0101lisko strukt\u016bru, kas l\u012bdz\u012bga dimantam, un zem\u0101ku ku\u0161anas temperat\u016bru 1030 gr\u0101dos p\u0113c Celsija - \u0161\u012b ret\u0101k\u0101 forma var kalpot k\u0101 atbalsts heterog\u0113niem katalizatoriem.<\/p>\n
Sil\u012bcija karb\u012bdu var atrast gan porainas, gan bl\u012bvas keramikas veid\u0101. Ra\u017eo\u0161anas pa\u0146\u0113mieni ir \u013coti at\u0161\u0137ir\u012bgi, un gal\u012bg\u0101 mikrostrukt\u016bra ir atkar\u012bga no izmantot\u0101s ra\u017eo\u0161anas metodes. Rea\u0123\u0113jot saist\u012btais SiC tiek ra\u017eots, infiltr\u0113jot oglek\u013ca-SiC mais\u012bjuma kompaktus ar izkaus\u0113tu sil\u012bciju, kas savstarp\u0113ji rea\u0123\u0113, veidojot vair\u0101k SiC, saistot s\u0101kotn\u0113jo kompaktu; sa\u0137epin\u0101to SiC, piem\u0113ram, Hexoloy, veido, izmantojot parastos keramikas form\u0113\u0161anas procesus, pirms sa\u0137epin\u0101\u0161anas augst\u0101 temperat\u016br\u0101 inert\u0101 atmosf\u0113r\u0101.<\/p>\n
Sil\u012bcija karb\u012bda ciet\u012bba p\u0113c Mosa skalas sasniedz 9,5, ierindojot to tre\u0161aj\u0101 viet\u0101 aiz dimanta un bora nitr\u012bda. Tas padara to piem\u0113rotu griez\u0113jinstrumentu un abraz\u012bvo materi\u0101lu grie\u0161anai, k\u0101 ar\u012b pret nodilumu iztur\u012bgu deta\u013cu, piem\u0113ram, gult\u0146u un bl\u012bvsl\u0113gu, izgatavo\u0161anai meh\u0101niskaj\u0101 r\u016bpniec\u012bb\u0101.<\/p>\n
Sil\u012bcija karb\u012bda unik\u0101l\u0101 stabilo \u0137\u012bmisko \u012bpa\u0161\u012bbu, lielisk\u0101s siltumvad\u012btsp\u0113jas, zem\u0101 termisk\u0101s izple\u0161an\u0101s koeficienta, ciet\u012bbas un meh\u0101nisk\u0101s iztur\u012bbas kombin\u0101cija ir \u013c\u0101vusi to pla\u0161i izmantot vair\u0101k\u0101s r\u016bpniec\u012bbas nozar\u0113s, tostarp naftas, \u0137\u012bmijas, mikroelektronikas, automobi\u013cu, avi\u0101cijas, pap\u012bra ra\u017eo\u0161anas, l\u0101zera ieguves r\u016bpniec\u012bb\u0101. Turkl\u0101t sil\u012bcija karb\u012bds tiek izmantots ar\u012b vides aizsardz\u012bbas inform\u0101cijas elektronik\u0101 un ener\u0123ijas izmanto\u0161anas lietojumos.<\/p>\n
Sil\u012bcija karb\u012bdu (SiC) var ra\u017eot, izmantojot divus procesus - reakcijas saist\u012b\u0161anu un sa\u0137epin\u0101\u0161anu, un abi \u0161ie procesi ietekm\u0113 t\u0101 gal\u012bgo mikrostrukt\u016bru. Reakcijas sa\u0137epin\u0101to SiC parasti veido, infiltr\u0113jot kompaktus, kas sast\u0101v no sil\u012bcija un oglek\u013ca mais\u012bjumiem, ar \u0161\u0137idro sil\u012bciju, kas p\u0113c tam rea\u0123\u0113 ar cit\u0101m sil\u012bcija un oglek\u013ca molekul\u0101m, veidojot vair\u0101k SiC sai\u0161u, savuk\u0101rt sa\u0137epin\u0101to SiC ra\u017eo, izmantojot parast\u0101s keramikas form\u0113\u0161anas metodes un bezoksidus sa\u0137epin\u0101\u0161anas pal\u012bgl\u012bdzek\u013cus.<\/p>\n
Silicija karb\u012bda lielisk\u0101 apstr\u0101d\u0101jam\u012bba padara to par lielisku materi\u0101lu nodilumiztur\u012bgu bl\u012bv\u0113\u0161anas komponentu izgatavo\u0161anai, \u012bpa\u0161i kombin\u0101cij\u0101 ar graf\u012btu. \u0160\u012b kombin\u0101cija nodro\u0161ina zem\u0101ku berzes koeficientu nek\u0101 alum\u012bnija keramikas un cieto sakaus\u0113jumu gad\u012bjum\u0101, k\u0101 ar\u012b saglab\u0101 savu formu augst\u0101s PV v\u0113rt\u012bb\u0101s, lai nov\u0113rstu \u0137\u012bmisko vielu, piem\u0113ram, s\u0101rmu un sk\u0101bju nopl\u016bdi vid\u0113.<\/p>\n
<\/p>","protected":false},"excerpt":{"rendered":"
Silicon Carbide is one of the hardest and most durable advanced ceramic materials, used both for its hardness as an […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","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":[3],"tags":[],"class_list":["post-23","post","type-post","status-publish","format-standard","hentry","category-sic-knowledge"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/siliconcarbideceramic.net\/lv\/wp-json\/wp\/v2\/posts\/23","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/siliconcarbideceramic.net\/lv\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/siliconcarbideceramic.net\/lv\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/siliconcarbideceramic.net\/lv\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/siliconcarbideceramic.net\/lv\/wp-json\/wp\/v2\/comments?post=23"}],"version-history":[{"count":3,"href":"https:\/\/siliconcarbideceramic.net\/lv\/wp-json\/wp\/v2\/posts\/23\/revisions"}],"predecessor-version":[{"id":29,"href":"https:\/\/siliconcarbideceramic.net\/lv\/wp-json\/wp\/v2\/posts\/23\/revisions\/29"}],"wp:attachment":[{"href":"https:\/\/siliconcarbideceramic.net\/lv\/wp-json\/wp\/v2\/media?parent=23"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/siliconcarbideceramic.net\/lv\/wp-json\/wp\/v2\/categories?post=23"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/siliconcarbideceramic.net\/lv\/wp-json\/wp\/v2\/tags?post=23"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}