Carbura de siliciu (carborundum) este un material dur - chiar sub diamant pe scara Mohs a durit\u0103\u021bii minerale - care se g\u0103se\u0219te sub form\u0103 de cristale negre sau verde \u00eenchis.<\/p>\n
Un material abraziv extrem de dur utilizat pentru \u0219lefuirea metalelor neferoase \u0219i a ceramicii. De asemenea, este potrivit pentru aplica\u021bii de \u0219lefuire, sablare \u0219i sablare.<\/p>\n
Carbura de siliciu (SiC), un compus covalent de o duritate ireductibil\u0103, compus din atomi de carbon \u0219i siliciu, se situeaz\u0103 pe locul al doilea dup\u0103 diamant \u0219i nitrura de bor cubic\u0103 \u00een clasamentul sc\u0103rii de duritate Mohs.<\/p>\n
Datorit\u0103 propriet\u0103\u021bilor sale abrazive, discurile abrazive diamantate sunt ideale pentru \u0219lefuirea \u0219i lustruirea metalelor neferoase, a ceramicii \u0219i a suprafe\u021belor din sticl\u0103. \u00cen plus, polizoarele diamantate pot fi g\u0103site, de asemenea, utilizate \u00een mod obi\u0219nuit pentru aplica\u021bii aerospa\u021biale \u0219i auto ca metod\u0103 de \u0219lefuire a componentelor metalurgice.<\/p>\n
SiC-ul negru este friabil, ceea ce \u00eei permite s\u0103 fie reciclat de numeroase ori prin intermediul ma\u0219inilor de tocat roci. \u00cen timp, componentele sale se fragmenteaz\u0103 \u0219i se microfractureaz\u0103, cre\u00e2nd noi muchii ascu\u021bite pentru opera\u021biuni \u00eembun\u0103t\u0103\u021bite de \u0219lefuire\/polizare.<\/p>\n
SiC se remarc\u0103 printre materialele dure prin duritatea sa extrem\u0103, propriet\u0103\u021bile sale unice \u0219i capacitatea de a \u0219lefui o\u021belul mai rapid \u0219i mai eficient dec\u00e2t oxidul de aluminiu (alumin\u0103 topit\u0103 brun\u0103) sau al\u021bi abrazivi naturali precum B4C. \u00cen plus, SiC se m\u00e2ndre\u0219te cu propriet\u0103\u021bi termice superioare celor ale B4C, ceea ce \u00eel face o alegere superioar\u0103 pentru utilizarea \u00een aplica\u021bii la temperaturi ridicate.<\/p>\n
Carbura de siliciu (SiC) este un material ceramic dur \u0219i durabil, utilizat pe scar\u0103 larg\u0103 \u00een toate industriile pentru duritatea sa \u0219i pentru alte caracteristici dezirabile, cum ar fi iner\u021bia chimic\u0103, conductivitatea termic\u0103 ridicat\u0103, coeficientul sc\u0103zut de dilatare, stabilitatea temperaturii \u0219i rezisten\u021ba la coroziune \u0219i abraziune.<\/p>\n
SiC este cunoscut pentru c\u0103 are o rezisten\u021b\u0103 mecanic\u0103 excelent\u0103, o rezisten\u021b\u0103 ridicat\u0103 la trac\u021biune \u0219i compresiune \u0219i o valoare impresionant\u0103 a modulului Young. \u00cen plus, este rezistent la acizi \u0219i le\u0219ii \u0219i se m\u00e2ndre\u0219te cu propriet\u0103\u021bi excelente de rezisten\u021b\u0103 la \u0219ocuri termice.<\/p>\n
SiC este utilizat pe scar\u0103 larg\u0103 pentru aplica\u021bii multiple, dincolo de rolul s\u0103u principal de material abraziv \u00een aplica\u021biile de \u0219mirghel \u0219i de ro\u021bi de \u0219lefuit, inclusiv pentru c\u0103ptu\u0219eli de cuptoare industriale, unelte de t\u0103iere, piese rezistente la uzur\u0103 pentru pompe \u0219i motoare de rachete, substraturi semiconductoare pentru diode emi\u021b\u0103toare de lumin\u0103 (LED), precum \u0219i substraturi semiconductoare pentru diode emi\u021b\u0103toare de lumin\u0103 (LED). SiC verde se m\u00e2ndre\u0219te, de obicei, cu niveluri de puritate mai ridicate dec\u00e2t SiC negru pentru aplica\u021bii de rectificare\/polizare de precizie, precum \u0219i pentru aplica\u021bii pentru substraturi pentru semiconductori; ambele variet\u0103\u021bi ofer\u0103 avantaje unice \u00een raport cu alte ceramice precum Alumina\/Zirconia \u00een ceea ce prive\u0219te caracteristicile de duritate\/conductivitate termic\u0103\/rezisten\u021b\u0103 la rupere, precum \u0219i aplica\u021biile pentru substraturi semiconductoare \u00een compara\u021bie cu ceramice precum Alumina\/Zirconia \u00een ceea ce prive\u0219te caracteristicile de duritate\/conductivitate termic\u0103\/rezisten\u021b\u0103 la rupere \u00een compara\u021bie cu alte ceramice precum Alumina\/Zirconia \u00een ceea ce prive\u0219te caracteristicile de duritate\/conductivitate termic\u0103\/rezisten\u021b\u0103 la rupere fa\u021b\u0103 de alte ceramici precum Alumina\/Zrconia, pe care alte ceramici nu le pot egala, caracteristicile sale superioare de performan\u021b\u0103, precum duritatea\/conductivitatea termic\u0103\/rezisten\u021ba la fractur\u0103\/rezisten\u021ba la fractur\u0103, fa\u021b\u0103 de ceramici precum Alumina\/Zirconia \u00een ceea ce prive\u0219te duritatea\/conductivitatea termic\u0103\/rezisten\u021ba la fractur\u0103\/rezisten\u021ba la fractur\u0103\/rezisten\u021ba la fractur\u0103\/rezisten\u021ba la fractur\u0103\/rezisten\u021ba la fractur\u0103 caracteristici de performan\u021b\u0103\/rezisten\u021ba la fractur\u0103\/rezisten\u021ba la fractur\u0103.Caracteristicile de performan\u021b\u0103 ale performan\u021belor Alum \/Zirconia\/zirconia\/ performan\u021bele de performan\u021b\u0103 ale rezisten\u021bei la fractur\u0103\/frconia \u00een ceea ce prive\u0219te duritatea\/fractalusivitatea \u00een ceea ce prive\u0219te duritatea\/conductivitatea termic\u0103\/rezisten\u021ba la fractur\u0103\/rezisten\u021ba la fractur\u0103\/rezisten\u021ba la fractur\u0103 etc. vs. etc... ZIN(I\/zirconiu+ rezisten\u021b\u0103 la fractur\u0103 etc.). vs==f =5=5=conia=5. Si=4. ZIN=1<\/p>\n
Carbura de siliciu (SiC) este una dintre cele mai u\u0219oare, mai dure \u0219i mai rezistente ceramici avansate de pe pia\u021b\u0103. Se m\u00e2ndre\u0219te cu o conductivitate termic\u0103 excelent\u0103, precum \u0219i cu faptul c\u0103 este foarte rezistent\u0103 la acizi \u0219i baze, rezistent\u0103 la temperaturi de p\u00e2n\u0103 la 1400 de grade Celsius f\u0103r\u0103 a suferi nicio degradare a rezisten\u021bei sau a performan\u021bei.<\/p>\n
Datorit\u0103 durit\u0103\u021bii sale incredibile, materialul Kevlar(r) este utilizat pe scar\u0103 larg\u0103 pentru produc\u021bia de veste antiglon\u021b. \u00cen plus, aceast\u0103 \u021bes\u0103tur\u0103 durabil\u0103 ofer\u0103 propriet\u0103\u021bi excep\u021bionale de rezisten\u021b\u0103 la abraziune \u0219i eroziune, ceea ce o face o alegere excelent\u0103 de material pentru fabricarea duzelor, a cicloanelor \u0219i a componentelor de pulverizare.<\/p>\n
Rezisten\u021ba chimic\u0103 a SiC poate fi \u00eent\u0103rit\u0103 \u0219i mai mult prin dopan\u021bi precum dopajul cu bor \u0219i aluminiu; atunci c\u00e2nd este dopat cu bor devine un semiconductor de tip p; dopajul cu aluminiu produce un semiconductor de tip n.<\/p>\n
Propriet\u0103\u021bile mecanice ale carburii de siliciu pot fi \u00eembun\u0103t\u0103\u021bite drastic atunci c\u00e2nd sunt acoperite cu un strat de grafen epitaxial atomic sub\u021bire. Testele de indentare a diamantului Berkovich au ar\u0103tat c\u0103 acoperirea acestuia cu grafen\u0103 duce la o duritate cu p\u00e2n\u0103 la 30% mai mare - la ad\u00e2ncimi de indentare de p\u00e2n\u0103 la 175 nanometri; se crede c\u0103 acest fenomen este atribuit form\u0103rii de diamin\u0103 din cauza presiunii aplicate de un indentator \u00een timpul indent\u0103rii.<\/p>\n
Carbura de siliciu se eviden\u021biaz\u0103 ca un material excep\u021bional de dur \u0219i durabil, cu o dilatare termic\u0103 foarte redus\u0103 \u0219i o conductivitate termic\u0103 ridicat\u0103, ceea ce \u00eel face potrivit pentru aplica\u021bii care implic\u0103 fluctua\u021bii mari de temperatur\u0103.<\/p>\n
SiC este cunoscut pentru c\u0103 rezist\u0103 la temperaturi ridicate \u0219i este rezistent la degradarea prin procese chimice \u0219i nucleare, fiind \u00een acela\u0219i timp un semiconductor electric care ofer\u0103 propriet\u0103\u021bi electrice utile.<\/p>\n
Edward G. Acheson a sintetizat pentru prima dat\u0103 carborundul ca parte a \u00eencerc\u0103rii sale de a sintetiza diamante sintetice \u00een 1891, folosind propriul s\u0103u procedeu de creare a unor cristale verzi \u0219i dure din pulberi de siliciu \u0219i reac\u021bii de carbon pe care le-a creat, numindu-\u0219i crea\u021bia carborundum dup\u0103 numele latin corundum - numele dat pietrelor pre\u021bioase rare precum corindonul.<\/p>\n
Carbura de siliciu legat\u0103 prin reac\u021bie este ob\u021binut\u0103 prin amestecarea pulberii de SiC cu un plastifiant \u0219i prin turnarea acesteia \u00een form\u0103, \u00eenainte de a reac\u021biona din nou cu siliciu gazos sau lichid pentru a produce SiC suplimentar. Pe de alt\u0103 parte, carbura de siliciu sinterizat\u0103 direct are granule mai fine \u0219i costuri de produc\u021bie mai mici, av\u00e2nd \u00een acela\u0219i timp o rezisten\u021b\u0103 mecanic\u0103 superioar\u0103 la temperatura camerei de 300 grade C \u0219i peste.<\/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\/ro\/wp-json\/wp\/v2\/posts\/144","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ceramicatijolart.com\/ro\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ceramicatijolart.com\/ro\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ceramicatijolart.com\/ro\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ceramicatijolart.com\/ro\/wp-json\/wp\/v2\/comments?post=144"}],"version-history":[{"count":1,"href":"https:\/\/ceramicatijolart.com\/ro\/wp-json\/wp\/v2\/posts\/144\/revisions"}],"predecessor-version":[{"id":145,"href":"https:\/\/ceramicatijolart.com\/ro\/wp-json\/wp\/v2\/posts\/144\/revisions\/145"}],"wp:attachment":[{"href":"https:\/\/ceramicatijolart.com\/ro\/wp-json\/wp\/v2\/media?parent=144"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ceramicatijolart.com\/ro\/wp-json\/wp\/v2\/categories?post=144"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ceramicatijolart.com\/ro\/wp-json\/wp\/v2\/tags?post=144"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}