![\"sa\u0137epin\u0101ts](\"http:\/\/siliconcarbideceramic.net\/wp-content\/uploads\/2024\/04\/sintered-silicon-carbide.jpg\")
<\/p>","protected":false},"excerpt":{"rendered":"Sil\u012bcija karb\u012bds ir viens no ciet\u0101kajiem keramikas materi\u0101liem, kam piem\u012bt \u0101rk\u0101rt\u012bgi augsta iztur\u012bba un siltumvad\u012btsp\u0113ja. Turkl\u0101t t\u0101 iztur\u012bba pret oksid\u0113\u0161anos un koroziju padara to piem\u0113rotu izmanto\u0161anai augstas temperat\u016bras apst\u0101k\u013cos.<\/p>\n
Reakcijas ce\u013c\u0101 saist\u012btajam SiC ir rupji graudi un zema iztur\u012bba pret koroziju, savuk\u0101rt tie\u0161i sa\u0137epin\u0101tajam SiC ir liel\u0101ks bl\u012bvums un tas nodro\u0161ina lab\u0101kus ekspluat\u0101cijas r\u0101d\u012bt\u0101jus augst\u0101s temperat\u016br\u0101s. Sa\u0137epin\u0101\u0161an\u0101 bez spiediena izmanto \u013coti smalku SiC pulveri ar neoks\u012bda sa\u0137epin\u0101\u0161anas piedev\u0101m, lai ieg\u016btu bl\u012bvu materi\u0101lu ar izcil\u0101m fizik\u0101laj\u0101m \u012bpa\u0161\u012bb\u0101m.<\/p>\n
Sil\u012bcija karb\u012bds ir viens no ciet\u0101kajiem pla\u0161i izmantotajiem abraz\u012bvajiem materi\u0101liem, kura ciet\u012bba p\u0113c Mosa skalas ir 9,5 \u2014 tuvu dimanta ciet\u012bbai, kas ir 10. \u0160\u012b ciet\u012bba nodro\u0161ina tam izcilu nodilumiztur\u012bbu pat paaugstin\u0101t\u0101s temperat\u016br\u0101s; \u0137\u012bmisk\u0101s vielas, s\u0101\u013ci, sk\u0101bes un s\u0101rmi tam nerada lielu apdraud\u0113jumu; siltuma triecienu iztur\u012bba ir laba; turkl\u0101t t\u0101 svars ir divreiz maz\u0101ks nek\u0101 t\u0113raudam!<\/p>\n
\u0160\u0137idr\u0101s f\u0101zes sinter\u0113\u0161anai ir priek\u0161roc\u012bbas sal\u012bdzin\u0101jum\u0101 ar citiem procesiem, tostarp zemas apstr\u0101des temperat\u016bras un labas form\u0113jam\u012bbas \u012bpa\u0161\u012bbas. Turkl\u0101t t\u0101s piln\u0101 bl\u012bvums un izcil\u0101s meh\u0101nisk\u0101s \u012bpa\u0161\u012bbas padara to piem\u0113rotu abraz\u012bvai apstr\u0101dei, sl\u012bp\u0113\u0161anai un pul\u0113\u0161anai, k\u0101 ar\u012b grie\u0161anai, urb\u0161anai, \u0113st\u0113\u0161anai un fr\u0113z\u0113\u0161anai.<\/p>\n
Sinter\u0113tais SiC tiek pla\u0161i izmantots pusvad\u012bt\u0101ju ra\u017eo\u0161anas iek\u0101rtu deta\u013c\u0101s, l\u0101zeros un kodoltermisko reaktoru konstrukcij\u0101s, pateicoties t\u0101 izcilajai \u0137\u012bmiskajai stabilit\u0101tei, temperat\u016bras iztur\u012bbai, zemajam bl\u012bvumam, iztur\u012bbai, nodilumiztur\u012bbai un zemajai aktiv\u0101cijas ener\u0123ijai. Pieejami gan reakcijas ce\u013c\u0101 saist\u012bti, gan tie\u0161i sinter\u0113ti SiC materi\u0101li; reakcijas ce\u013c\u0101 saist\u012btie materi\u0101li parasti ir l\u0113t\u0101ki un tiem ir rupj\u0101ka graudain\u012bba, kas nodro\u0161ina zem\u0101ku triecieniztur\u012bbu un siltuma iztur\u012bbu, savuk\u0101rt tie\u0161i sinter\u0113tajiem materi\u0101liem ir lab\u0101ka nodilumiztur\u012bba paaugstin\u0101t\u0101s temperat\u016br\u0101s, un to smalk\u0101ka graudain\u012bba nodro\u0161ina liel\u0101ku nodilumiztur\u012bbu paaugstin\u0101t\u0101s temperat\u016br\u0101s. Reakcijas ce\u013c\u0101 saist\u012btie materi\u0101li ar rupj\u0101ku graudain\u012bbu parasti tiek izmantoti bie\u017e\u0101k, savuk\u0101rt tie ar smalk\u0101ku graudain\u012bbu tiek specifik\u0101cij\u0101s nor\u0101d\u012bti ret\u0101k.\u00a0 Lai nodro\u0161in\u0101tu liel\u0101ku ciet\u012bbu darba apst\u0101k\u013cos, kas prasa augst\u0101ku iztur\u012bbu pret nodilumu paaugstin\u0101t\u0101s temperat\u016br\u0101s, sal\u012bdzin\u0101jum\u0101 ar tie\u0161i sa\u0137epin\u0101tajiem veidiem bie\u017e\u0101k tiek nor\u0101d\u012bti reakcijas sa\u0137epin\u0101tie veidi; savuk\u0101rt, ja ir nepiecie\u0161ama liel\u0101ka ciet\u012bba, tie\u0161i sa\u0137epin\u0101tie veidi tiek izmantoti bie\u017e\u0101k, jo tiem ir lab\u0101ka ciet\u012bba.ciet\u012bbu paaugstin\u0101t\u0101s darba temperat\u016br\u0101s, t\u0101d\u0113\u013c tie tiek bie\u017e\u0101k nor\u0101d\u012bti; ja tiek nor\u0101d\u012bti tie\u0161i sa\u0137epin\u0101tie materi\u0101li, var b\u016bt nepiecie\u0161amas abas opcijas, un ciet\u012bba tiek nodro\u0161in\u0101ta bie\u017e\u0101k, t\u0101d\u0113\u013c tie tiek izmantoti bie\u017e\u0101k.<\/p>\n
Sil\u012bcija karb\u012bds ir \u0101rk\u0101rt\u012bgi iztur\u012bgs ugunsiztur\u012bgs keramikas materi\u0101ls, kam piem\u012bt izcila ciet\u012bba, iztur\u012bba pret augst\u0101m temperat\u016br\u0101m un iztur\u012bba pret \u0137\u012bmisko koroziju \u2014 \u012bpa\u0161\u012bbas, kas to padara par vienu no daudzpus\u012bg\u0101kajiem ugunsiztur\u012bgajiem materi\u0101liem pasaul\u0113 un ko izmanto da\u017e\u0101d\u0101s r\u016bpniecisk\u0101s jom\u0101s.<\/p>\n
Karst\u0101 pres\u0113\u0161ana ar sinter\u0113\u0161anu ir viena no galvenaj\u0101m SiC keramikas ra\u017eo\u0161anas metod\u0113m. \u0160aj\u0101 proces\u0101 tiek izmantots \u0101rk\u0101rt\u012bgi smalks sil\u012bcija karb\u012bda pulveris, kas sajaukts ar sinter\u0113\u0161anas piedev\u0101m, un to sabl\u012bv\u0113, izmantojot tradicion\u0101l\u0101s keramikas form\u0113\u0161anas metodes, piem\u0113ram, izost\u0101tisko pres\u0113\u0161anu, pres\u0113\u0161anu ar matricu vai injekcijas form\u0113\u0161anu, lai ieg\u016btu bl\u012bvas strukt\u016bras, kas sast\u0101v no s\u012bk\u0101m da\u013ci\u0146\u0101m, kuras nodro\u0161ina iztur\u012bbu.<\/p>\n
SiC bezspiediena sa\u0137epin\u0101\u0161ana \u0161\u0137idr\u0101 f\u0101z\u0113 (LPPSiC) ir v\u0113l viena SiC bl\u012bvuma palielin\u0101\u0161anas metode. \u0160aj\u0101 proces\u0101 a-SiC da\u013ci\u0146u neapdedzin\u0101t\u0101 \u0137ermen\u012b ievada \u0161\u0137idro sil\u012bciju vai sil\u012bcija sakaus\u0113jumu, lai veidotu b-SiC, kas rea\u0123\u0113 un saist\u0101s ar eso\u0161aj\u0101m a-SiC da\u013ci\u0146\u0101m, t\u0101d\u0113j\u0101di bl\u012bv\u0113jot gan \u0161\u012bs da\u013ci\u0146as, gan \u0137ermeni kopum\u0101.<\/p>\n
Reakcijas ce\u013c\u0101 sa\u0137epin\u0101tajam sil\u012bcija karb\u012bdam piem\u012bt izcilas form\u0113\u0161anas \u012bpa\u0161\u012bbas sare\u017e\u0123\u012btu formu izgatavo\u0161anai, zemas apstr\u0101des temperat\u016bras un augsts t\u012br\u012bbas l\u012bmenis; t\u0101 meh\u0101nisk\u0101s \u012bpa\u0161\u012bbas, piem\u0113ram, lieces iztur\u012bba, ir zem\u0101kas nek\u0101 parastajam sa\u0137epin\u0101tajam sil\u012bcija karb\u012bdam; lai uzlabotu \u0161o \u012bpa\u0161\u012bbu, ir nepiecie\u0161ams kontrol\u0113t atliku\u0161\u0101 sil\u012bcija (Si) da\u013ci\u0146u izm\u0113rus, uzturot tos zem 100 nm \u2013 \u0161is sasniegums iez\u012bm\u0113 lielu pan\u0101kumu LSiC keramikas iztur\u012bbas uzlabo\u0161an\u0101.<\/p>\n
Sil\u012bcija karb\u012bds izce\u013cas ar izcilu iztur\u012bbu pret koroziju un sp\u0113j iztur\u0113t temperat\u016bras l\u012bdz pat 1 900 \u00b0C, t\u0101d\u0113\u013c tas ir piem\u0113rots lietojumiem, kur \u0137\u012bmiskie un termiskie triecieni var saboj\u0101t deta\u013cas.<\/p>\n
Keramikas korozija rodas oks\u012bda sl\u0101\u0146a veido\u0161an\u0101s rezult\u0101t\u0101 uz t\u0101s virsmas; parasti tas ir sil\u012bcija dioks\u012bds vai silik\u0101ts, atkar\u012bb\u0101 no t\u0101diem faktoriem k\u0101 vides iedarb\u012bba, piemais\u012bjumi, aglomer\u0101cijas pal\u012bgvielas, graudu robe\u017eu f\u0101zes un reakcijas, kas notiek \u012bsi p\u0113c tam. Tas izraisa iev\u0113rojamas at\u0161\u0137ir\u012bbas sil\u012bcija karb\u012bda un sil\u012bcija nitr\u012bda materi\u0101lu korozijas \u012bpa\u0161\u012bb\u0101s.<\/p>\n
T\u0101 k\u0101 galvenie faktori, kas j\u0101\u0146em v\u0113r\u0101, projekt\u0113jot materi\u0101lus lieto\u0161anai koroz\u012bv\u0101s vid\u0113s, ir iztur\u012bbas r\u0101d\u012bt\u0101js (ko m\u0113ra k\u0101 korozijas progres\u0113\u0161anas \u0101trumu koroz\u012bv\u0101 vid\u0113) un meh\u0101nisk\u0101 iztur\u012bba (C-gredzena vai \u010detru punktu lieces iztur\u012bba), korozija palielina virsmas defektu skaitu, kas laika gait\u0101 v\u0101jina materi\u0101la iztur\u012bbu un samazina t\u0101 meh\u0101nisko kalpo\u0161anas laiku.<\/p>\n
Sinter\u0113tais sil\u012bcija karb\u012bds ir lieliska izv\u0113le izmanto\u0161anai nelabv\u0113l\u012bgos apst\u0101k\u013cos, pateicoties t\u0101 augstajai iztur\u012bbai un nodilumiztur\u012bbai, zemajam \u012bpatn\u0113jam bl\u012bvumam un izcilaj\u0101m tribolo\u0123iskaj\u0101m \u012bpa\u0161\u012bb\u0101m. To bie\u017ei izmanto deta\u013c\u0101s, kur\u0101m j\u0101iztur trieciena slodzes no smag\u0101m slodz\u0113m, piem\u0113ram, str\u016bklas sprausl\u0101s vai sl\u012bdo\u0161o gult\u0146u gult\u0146os; turkl\u0101t to pla\u0161i izmanto oglek\u013ca \u0161\u0137iedras pastiprin\u0101tu sil\u012bcija karb\u012bda brem\u017eu vai bru\u0146u ra\u017eo\u0161an\u0101, jo tas ir iztur\u012bgs pret liel\u0101m slodz\u0113m un augst\u0101m temperat\u016br\u0101m.<\/p>\n
Sinter\u0113tais sil\u012bcija karb\u012bds ir \u0101rk\u0101rt\u012bgi cietais keramikas materi\u0101ls ar izcilu nodilumiztur\u012bbu un korozijas aizsardz\u012bbas \u012bpa\u0161\u012bb\u0101m, kas to padara par lielisku abraz\u012bvo materi\u0101lu. To izmanto sl\u012bp\u0113\u0161anas rati\u0146os, hon\u0113\u0161anas r\u012bkos, smil\u0161u str\u016bklu iek\u0101rt\u0101s un \u016bdensstr\u016bklas grie\u0161anas iek\u0101rt\u0101s sl\u012bp\u0113\u0161anas vai hon\u0113\u0161anas darbiem, k\u0101 ar\u012b \u016bdensstr\u016bklas grie\u0161anas procesos.<\/p>\n
\u0160\u012b materi\u0101la \u0137\u012bmisk\u0101 iztur\u012bba \u013cauj tam iztur\u0113t ilgsto\u0161u saskari ar parast\u0101m neorganiskaj\u0101m sk\u0101b\u0113m, s\u0101\u013ciem un s\u0101rmiem, necie\u0161ot kvalit\u0101tes pasliktin\u0101\u0161anos. Turkl\u0101t t\u0101 iztur\u012bbu palielina cie\u0161i sak\u0101rtotas kovalent\u0101s saites, kas veidojas no 4 sil\u012bcija un 4 oglek\u013ca atomiem, veidojot tetraedr\u0101las koordin\u0101cijas.<\/p>\n
Sinter\u0113tais SiC tiek ieg\u016bts, saspie\u017eot un sinter\u0113jot (kars\u0113jot) sil\u012bcija dioks\u012bda pulvera da\u013ci\u0146as. Sinter\u0113\u0161anas proces\u0101 \u0161\u012bs atsevi\u0161\u0137\u0101s da\u013ci\u0146as sapl\u016bst vien\u0101 ciet\u0101 gabal\u0101 ar augstu ciet\u012bbu un iztur\u012bbu, kas ir iztur\u012bgs ar\u012b pret oksid\u0113\u0161anos un koroziju; turkl\u0101t tam ir liel\u0101ka iztur\u012bba nek\u0101 liel\u0101kajai da\u013cai keramikas veidu.<\/p>\n
Reakcijas ce\u013c\u0101 saist\u012btais sil\u012bcija karb\u012bds, ko ra\u017eo, infiltr\u0113jot \u0161\u0137idro sil\u012bciju porain\u0101s graf\u012bta vai oglek\u013ca sagatav\u0113s, pied\u0101v\u0101 zem\u0101ku iztur\u012bbu nek\u0101 sa\u0137epin\u0101tais sil\u012bcija karb\u012bds, ta\u010du ir piem\u0113rot\u0101ks, pateicoties zem\u0101m apstr\u0101des temperat\u016br\u0101m, labai form\u0113jam\u012bbai un liel\u0101kai t\u012br\u012bbai. Komerci\u0101li pieejamajam reakcijas ce\u013c\u0101 sa\u0137epin\u0101tajam sil\u012bcija karb\u012bdam lieces iztur\u012bba istabas temperat\u016br\u0101 ir apm\u0113ram 300 MPa.<\/p>\n
Reakcijas ce\u013c\u0101 sa\u0137epin\u0101ts sil\u012bcija karb\u012bds ar bora vai oglek\u013ca sa\u0137epin\u0101\u0161anas pal\u012bgviel\u0101m piem\u012bt \u0101rk\u0101rt\u012bgi augsta pretest\u012bba pret l\u0113n\u0101s deform\u0101cijas, ko pan\u0101k, mainot graudu robe\u017eu ener\u0123ijas un virsmas ener\u0123ijas, k\u0101 ar\u012b palielinot apjoma dif\u016bzijas \u0101trumus, lai veicin\u0101tu bl\u012bvuma palielin\u0101\u0161anos un bl\u012bvuma palielin\u0101\u0161anos. Tas \u013cauj graudiem palikt tie\u0161\u0101 krist\u0101lisk\u0101 kontakt\u0101, neveidojot otr\u0101s f\u0101zes strukt\u016bras graudu robe\u017e\u0101s.<\/p>\n
<\/p>","protected":false},"excerpt":{"rendered":"
Silicon carbide is one of the hardest ceramic materials, boasting extremely high strength and thermal conductivity. Additionally, its resistance to […]<\/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":"default","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":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","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":[5],"tags":[],"class_list":["post-86","post","type-post","status-publish","format-standard","hentry","category-product-related"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/siliconcarbideceramic.net\/lv\/wp-json\/wp\/v2\/posts\/86","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=86"}],"version-history":[{"count":4,"href":"https:\/\/siliconcarbideceramic.net\/lv\/wp-json\/wp\/v2\/posts\/86\/revisions"}],"predecessor-version":[{"id":380,"href":"https:\/\/siliconcarbideceramic.net\/lv\/wp-json\/wp\/v2\/posts\/86\/revisions\/380"}],"wp:attachment":[{"href":"https:\/\/siliconcarbideceramic.net\/lv\/wp-json\/wp\/v2\/media?parent=86"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/siliconcarbideceramic.net\/lv\/wp-json\/wp\/v2\/categories?post=86"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/siliconcarbideceramic.net\/lv\/wp-json\/wp\/v2\/tags?post=86"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}