R\u00e4nikarbiid (SiC) on \u00e4\u00e4rmiselt k\u00f5va s\u00fcnteetiliselt toodetud kristalliline \u00fchend, millel on laialdased t\u00f6\u00f6stuslikud rakendused. SiC on Mohsi skaalal mineraalide k\u00f5vaduse j\u00e4rgi 9,5, mis on selles osas teine p\u00e4rast teemanti.<\/p>\n
Keraamilised kiud on lahutamatu osa t\u00e4iustatud tulekindlates materjalides ja funktsionaalses keraamikas, kus need annavad t\u00e4iendava kulumiskindluse, olles kaetud v\u00f5i kaetud t\u00e4iendava kulumiskindluse saavutamiseks.<\/p>\n
R\u00e4nikarbiid, mida nimetatakse ka mustaks r\u00e4nikarbiidiks ja K-karbiidiks, on oksiidita keraamiline materjal, millel on erakordne tugevus, k\u00f5vadus ja keemiline inertsus. R\u00e4nikarbiidil, mis koosneb r\u00e4ni aatomitega kovalentselt seotud s\u00fcsinikuaatomitest kristallv\u00f5rega, on mitmesuguse j\u00e4rjestusega pol\u00fcmorfism, mille tulemuseks on kuubiline, heksagonaalne ja romboeedriline kristallstruktuur.<\/p>\n
SiC on \u00fcks k\u00f5ige k\u00f5vemaid olemasolevaid materjale, mis on Mohsi skaalal hinnatud 9,5 - teisel kohal p\u00e4rast borkarbiidi (9,5) ja teemanti (10). See on suurep\u00e4rase kulumiskindlusega ning seda on \u00e4\u00e4rmiselt raske murda v\u00f5i kahjustada; lisaks sellele on see v\u00f5imeline taluma k\u00f5rgeid temperatuure, mist\u00f5ttu sobib see t\u00f6\u00f6stuslikeks rakendusteks.<\/p>\n
Alumiiniumoksiidi kasutatakse laialdaselt selle k\u00f5vaduse t\u00f5ttu, abrasiivides selle kulumiskindluse t\u00f5ttu, tulekindlates materjalides ja keraamikas selle madala soojuspaisumise ja roomavuskindluse t\u00f5ttu, elektroonikas selle paremate elektriliste omaduste t\u00f5ttu ning tuumareaktorites selle vastupidavuse t\u00f5ttu kiirguskahjustustele.<\/p>\n
R\u00e4nikarbiidi toodetakse kaubanduslikult paagutamise teel, kus pulbriline r\u00e4ni ja s\u00fcsinik surutakse kokku \u00e4\u00e4rmise surve all tahkeks massiks. P\u00e4rast mehaanilist t\u00f6\u00f6tlemist torudeks v\u00f5i plaatideks\/plokkideks v\u00f5ib seda edasi t\u00f6\u00f6delda, et seda saaks kasutada t\u00f6\u00f6stuslikes protsessiseadmetes ja kaasaegses lapidariidis. T\u00e4nu oma vastupidavusele ja suhteliselt odavale hinnale on see endiselt populaarne valik kaasaegsete lapidarite seas.<\/p>\n
R\u00e4nikarbiid (SiC) on \u00e4\u00e4rmiselt k\u00f5va materjal, mille k\u00f5vadus on Mohsi skaalal 9 ja millel on suurep\u00e4rased soojuspaisumisomadused, keemiline vastupidavus hapete ja leeliste suhtes, k\u00f5rge temperatuuritaluvus ning korrosiooni- ja termilise \u0161oki vastupidavus. SiC on ka v\u00e4ga tiheda struktuuriga, mis muudab selle tihedaks, kuid samas vastupidavaks materjaliks, millega t\u00f6\u00f6tada.<\/p>\n
Moissaniiti leidub looduses haruldase mineraali moissanitina, kuid alates 1893. aastast on seda masstoodanguna toodetud nii abrasiivse pulbri kujul kui ka suurte \u00fcksikkristallidena, mida kasutatakse v\u00e4\u00e4riskividena. Moissaniit on osutunud mitmek\u00fclgseks komponendiks, mis muudab tootjate ja inseneride elu lihtsamaks, kuna seda kasutatakse laialdaselt vastupidavates t\u00f6\u00f6stuslikes rakendustes, nagu lihvimine, l\u00f5ikamine ja mehaaniline t\u00f6\u00f6tlemine, samuti metallmaatriksiga komposiitides, kus see toimib keraamilise sideainena, mis tugevdab ja stabiliseerib osi.<\/p>\n
R\u00e4nikarbiid eristub abrasiivina oma konkurentidest selle poolest, et see ei lagune l\u00f5hkumise v\u00f5i l\u00f6\u00f6kide m\u00f5jul, mist\u00f5ttu sobib see eriti h\u00e4sti t\u00f6\u00f6stuslikeks lihvimisseadmeteks, n\u00e4iteks rattadeks. Lisaks sellele kasutavad kivikillustikuga ehete valmistajad seda abrasiivi v\u00e4ga edukalt, kuna selle teravad ja k\u00f5vad servad paljastavad pidevalt uusi pindu lihvimiseks ja silumiseks. Musta r\u00e4nikarbiidi eelistatakse sageli rohelisele r\u00e4nikarbiidile, mida toodetakse selleks otstarbeks elektrisiseses takistusahjus.<\/p>\n
R\u00e4nikarbiidi k\u00f5vaduse, keemilise inertsuse ja termilise stabiilsuse kombinatsioon teeb sellest suurep\u00e4rase materjalivaliku kulumis- ja kulumiskindlust n\u00f5udvate rakenduste jaoks. See talub t\u00f5husalt korrosiooni, erosiooni ja h\u00f5\u00f5rdekulumist ning on hea m\u00f5\u00f5tmete stabiilsusega ja talub veatult k\u00f5rgeid temperatuure.<\/p>\n
Kuna korund on oma k\u00f5vaduse kohta suhteliselt kerge, saab seda kasutada abrasiivsetes rakendustes, ilma et see kahjustaks keraamika tugevust. Lisaks sellele on korund ideaalne abrasiiv, mis sobib h\u00e4sti nii m\u00e4rg- kui ka kuivlihvimiseks; erinevate teravikuv\u00f5imalustega on see suurep\u00e4rane vahend metallide koorimiseks, kivi- ja marmorpindade poleerimiseks ning rooste eemaldamiseks ja rooste eemaldamiseks metallosadelt.<\/p>\n
R\u00e4nikarbiid sobib h\u00e4sti elektrilisteks rakendusteks t\u00e4nu oma madalale lekkevoolule ja olekutakistusele, mist\u00f5ttu on see suurep\u00e4rane materjal pooljuhtkomponentide, n\u00e4iteks dioodide ja transistoride ning muude k\u00f5rgepingeseadmete tootmiseks.<\/p>\n
R\u00e4nikarbiid on \u00fcldjuhul ohutult k\u00e4sitletav; siiski v\u00f5ib selle tolm olla m\u00fcrgine, kui seda liivatamise v\u00f5i lihvimise ajal sisse hingata; et v\u00e4hendada kokkupuudet pulbrilise r\u00e4nikarbiidiga t\u00f6\u00f6tamise ajal, on m\u00f5istlik kanda n\u00f5uetekohaseid kaitsevahendeid ja ventileerida oma t\u00f6\u00f6ruum korralikult. Kuna see on ka habras ja n\u00f5uab erilist ettevaatust, kui seda t\u00f6\u00f6riistadega l\u00f5igatakse v\u00f5i kujundatakse; eriti oluline on see, kui seda kasutatakse v\u00e4ikeste \u00fcksikasjalike detailide, n\u00e4iteks skulptuuride v\u00f5i ehete valmistamiseks.<\/p>","protected":false},"excerpt":{"rendered":"
Silicon carbide (SiC) is an extremely hard synthetically produced crystalline compound with wide industrial applications. SiC ranks 9.5 on Mohs […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","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-44","post","type-post","status-publish","format-standard","hentry","category-sic-knowledge"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/siliconcarbideceramic.net\/et\/wp-json\/wp\/v2\/posts\/44","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/siliconcarbideceramic.net\/et\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/siliconcarbideceramic.net\/et\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/siliconcarbideceramic.net\/et\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/siliconcarbideceramic.net\/et\/wp-json\/wp\/v2\/comments?post=44"}],"version-history":[{"count":1,"href":"https:\/\/siliconcarbideceramic.net\/et\/wp-json\/wp\/v2\/posts\/44\/revisions"}],"predecessor-version":[{"id":45,"href":"https:\/\/siliconcarbideceramic.net\/et\/wp-json\/wp\/v2\/posts\/44\/revisions\/45"}],"wp:attachment":[{"href":"https:\/\/siliconcarbideceramic.net\/et\/wp-json\/wp\/v2\/media?parent=44"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/siliconcarbideceramic.net\/et\/wp-json\/wp\/v2\/categories?post=44"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/siliconcarbideceramic.net\/et\/wp-json\/wp\/v2\/tags?post=44"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}