{"id":735,"date":"2026-11-08T23:03:29","date_gmt":"2026-11-08T15:03:29","guid":{"rendered":"https:\/\/siliconcarbide.net\/?p=735"},"modified":"2026-11-08T23:03:29","modified_gmt":"2026-11-08T15:03:29","slug":"carbura-de-siliciu-recristalizata-pentru-accesorii-de-cuptor","status":"publish","type":"post","link":"https:\/\/siliconcarbide.net\/ro\/recrystallized-silicon-carbide-for-kiln-furniture\/","title":{"rendered":"Carbur\u0103 de siliciu recristalizat\u0103 pentru accesorii de cuptor"},"content":{"rendered":"<h1><span class=\"\">Carbur\u0103 de siliciu recristalizat\u0103 (RSiC \/ RSC) \u2014 pentru accesorii de cuptor, duze de arz\u0103tor \u0219i piese structurale pentru temperaturi ridicate<\/span><\/h1>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Dac\u0103 ciclul cuptorului dumneavoastr\u0103 dep\u0103\u0219e\u0219te 1450 \u00b0C, implic\u0103 \u00eenc\u0103lzire\/r\u0103cire rapid\u0103, iar un adjuvant de sinterizare sau o faz\u0103 cu siliciu liber ar putea deveni punctul slab \u2014 aceasta este pagina dedicat\u0103 materialului pe care ar trebui s\u0103 o citi\u021bi \u00eenainte de a face specifica\u021biile.<\/span><\/strong><span class=\"\"> RSiC nu este \u201cun alt tip de SiC\u201d. Este tipul pe care \u00eel alege\u021bi atunci c\u00e2nd <\/span><strong><span class=\"\">rezisten\u021ba la \u0219oc termic \u0219i puritatea chimic\u0103 sunt mai importante dec\u00e2t densitatea maxim\u0103<\/span><\/strong><span class=\"\">.<\/span><\/p>\n<h2><span class=\"\">Singura diferen\u021b\u0103 care influen\u021beaz\u0103 toate deciziile ulterioare<\/span><\/h2>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Majoritatea paginilor furnizorilor prezint\u0103 densitatea, porozitatea \u0219i rezisten\u021ba RSiC, dar se opresc aici. Aceste informa\u021bii sunt necesare, dar nu suficiente. \u00centrebarea relevant\u0103 pentru luarea deciziei este: <\/span><strong><span class=\"\">De ce ar alege cineva \u00een mod deliberat un carbur\u0103 de siliciu cu porozitate deschis\u0103 de 10\u201320% \u00een locul unui SSiC dens, care arat\u0103 mai bine \u00een fi\u0219a tehnic\u0103?<\/span><\/strong><\/p>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">R\u0103spunsul se afl\u0103 \u00een microstructur\u0103. RSiC se ob\u021bine prin sinterizarea pulberii de SiC de \u00eenalt\u0103 puritate la o temperatur\u0103 cuprins\u0103 \u00eentre aproximativ 2200 \u0219i 2450 \u00b0C <\/span><strong><span class=\"\">f\u0103r\u0103 aditivi de sinterizare<\/span><\/strong><span class=\"\">. Granulele de carbur\u0103 de siliciu se dezvolt\u0103 printr-un mecanism de evaporare-condensare, form\u00e2nd leg\u0103turi directe de tip \u201eg\u00e2t\u201d \u00eentre granule. Materialul se contract\u0103 foarte pu\u021bin \u00een timpul arderii, iar spa\u021biul pe care SiC-ul dens l-ar umple cu aditivi de sinterizare sau siliciu liber r\u0103m\u00e2ne ca <\/span><strong><span class=\"\">porozitate conectat\u0103, deschis\u0103<\/span><\/strong><span class=\"\">. Aceast\u0103 porozitate nu reprezint\u0103 un defect de fabrica\u021bie. Este caracteristica func\u021bional\u0103 care confer\u0103 RSiC-ului rezisten\u021ba la \u0219ocuri termice \u0219i inertitatea chimic\u0103.<\/span><\/p>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Acesta este criteriul de evaluare care face diferen\u021ba \u00eentre un cump\u0103r\u0103tor care \u00een\u021belege clasele de SiC \u0219i unul care se bazeaz\u0103 doar pe coloana cu densitatea.<\/span><\/p>\n<h2><span class=\"\">RSiC vs. SSiC vs. SiSiC\/RBSiC: tabelul comparativ pe care majoritatea furnizorilor nu \u00eel afi\u0219eaz\u0103 pe pagina produselor lor<\/span><\/h2>\n<div class=\"ds-scroll-area ds-scroll-area--show-on-focus-within ds-scroll-area--enabled _1210dd7 c03cafe9\">\n<div class=\"ds-scroll-area__gutters\">\n<div class=\"ds-scroll-area__horizontal-gutter\">\n<div class=\"ds-scroll-area__horizontal-bar\">&nbsp;<\/div>\n<\/div>\n<div class=\"ds-scroll-area__vertical-gutter\">&nbsp;<\/div>\n<\/div>\n<table>\n<thead>\n<tr>\n<th><span class=\"\">Articol<\/span><\/th>\n<th><strong><span class=\"\">RSiC (recristalizat)<\/span><\/strong><\/th>\n<th><strong><span class=\"\">SSiC (sinterizat f\u0103r\u0103 presiune)<\/span><\/strong><\/th>\n<th><strong><span class=\"\">SiSiC \/ RBSiC (legat prin reac\u021bie)<\/span><\/strong><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong><span class=\"\">Puritatea SiC<\/span><\/strong><\/td>\n<td><span class=\"\">\u226599%, <\/span><strong><span class=\"\">f\u0103r\u0103 agent de sinterizare<\/span><\/strong><\/td>\n<td><span class=\"\">De obicei &gt;98%, con\u021bine aditivi de sinterizare pe baz\u0103 de bor \u0219i carbon<\/span><\/td>\n<td><span class=\"\">Schelet din SiC + <\/span><strong><span class=\"\">8\u201315% siliciu liber<\/span><\/strong><\/td>\n<\/tr>\n<tr>\n<td><strong><span class=\"\">Porozitate deschis\u0103<\/span><\/strong><\/td>\n<td><strong><span class=\"\">10\u201320% (func\u021bional, conectat)<\/span><\/strong><\/td>\n<td><span class=\"\">De obicei &lt;2\u20133%<\/span><\/td>\n<td><span class=\"\">Aproape de zero (pori umplu\u021bi cu Si)<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong><span class=\"\">Temperatura maxim\u0103 de func\u021bionare (aer)<\/span><\/strong><\/td>\n<td><strong><span class=\"\">~1600\u20131650 \u00b0C<\/span><\/strong><\/td>\n<td><span class=\"\">~1500\u20131550 \u00b0C (\u00een func\u021bie de agentul de ajutor)<\/span><\/td>\n<td><strong><span class=\"\">Limitat la ~1400 \u00b0C pe termen lung<\/span><\/strong><span class=\"\"> (Si liber se \u00eenmoaie)<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong><span class=\"\">Rezisten\u021ba la \u0219oc termic<\/span><\/strong><\/td>\n<td><strong><span class=\"\">Excelent<\/span><\/strong><span class=\"\"> \u2014 motivul principal pentru care se opteaz\u0103 pentru RSiC<\/span><\/td>\n<td><span class=\"\">Bun, dar limitat de caroseria mai grea \u0219i de echipamentele auxiliare<\/span><\/td>\n<td><span class=\"\">Moderat; siliciul liber introduce o faz\u0103 cu punct de topire sc\u0103zut<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong><span class=\"\">Rezisten\u021ba chimic\u0103<\/span><\/strong><\/td>\n<td><span class=\"\">Excelent \u2014 f\u0103r\u0103 Si liber, f\u0103r\u0103 faz\u0103 sticloas\u0103 la limitele dintre granule<\/span><\/td>\n<td><span class=\"\">Bine, dar aditivii de sinterizare pot fi eluia\u021bi \u00een medii chimice agresive<\/span><\/td>\n<td><strong><span class=\"\">Siliciul liber limiteaz\u0103 rezisten\u021ba la alcali puternici \u0219i la HF<\/span><\/strong><\/td>\n<\/tr>\n<tr>\n<td><strong><span class=\"\">Geometrie tipic\u0103 \/ logica costurilor<\/span><\/strong><\/td>\n<td><span class=\"\">Pl\u0103ci, grinzi, \u021bevi, duze \u2014 <\/span><strong><span class=\"\">piese cu pere\u021bi sub\u021biri \u0219i supuse ciclurilor termice<\/span><\/strong><\/td>\n<td><span class=\"\">Piese de uzur\u0103 compacte, garnituri, componente mici de precizie<\/span><\/td>\n<td><strong><span class=\"\">Piese mari, complexe, cu form\u0103 aproape de cea final\u0103<\/span><\/strong><span class=\"\"> \u00een cazul \u00een care costul conteaz\u0103 mai mult dec\u00e2t temperatura maxim\u0103<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Regula de selec\u021bie:<\/span><\/strong><span class=\"\"> potrivi nota cu <\/span><strong><span class=\"\">temperatura, mediul, contactul cu substan\u021be chimice \u0219i ciclul termic \u2014 nu la abrevierea \u201cSiC\u201d.\u201d<\/span><\/strong><span class=\"\"> Dac\u0103 aplica\u021bia necesit\u0103 o suprafa\u021b\u0103 dens\u0103, cu porozitate redus\u0103, pentru etan\u0219are sau rezisten\u021b\u0103 la uzur\u0103, RSiC nu este alegerea potrivit\u0103. Dac\u0103 aplica\u021bia implic\u0103 \u00eenc\u0103lziri \u0219i r\u0103ciri rapide repetate la temperaturi de peste 1450 \u00b0C, iar o faz\u0103 de siliciu liber sau un aditiv de sinterizare ar putea constitui cauza defect\u0103rii, RSiC este adesea singurul tip de SiC care rezist\u0103<\/span><span class=\"\">.<\/span><\/p>\n<h2><span class=\"\">Specifica\u021bii tehnice \u2014 cifrele care conteaz\u0103 pentru elaborarea specifica\u021biilor \u0219i controlul la recep\u021bie<\/span><\/h2>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Tabelul de mai jos prezint\u0103 intervalul de valori pe care ar trebui s\u0103 \u00eel utiliza\u021bi ca <\/span><strong><span class=\"\">criteriu de referin\u021b\u0103 \u00een evaluarea fi\u0219ei tehnice a oric\u0103rui furnizor de RSiC<\/span><\/strong><span class=\"\">. Valorile variaz\u0103 \u00een func\u021bie de granula\u021bie, de traseul de formare \u0219i de profilul de ardere; \u00een cazul \u00een care un furnizor indic\u0103 o singur\u0103 valoare f\u0103r\u0103 a preciza un interval, ar trebui s\u0103 i se solicite standardul de testare \u0219i geometria e\u0219antionului.<\/span><\/p>\n<div class=\"ds-scroll-area ds-scroll-area--show-on-focus-within ds-scroll-area--enabled _1210dd7 c03cafe9\">\n<div class=\"ds-scroll-area__gutters\">\n<div class=\"ds-scroll-area__horizontal-gutter\">&nbsp;<\/div>\n<div class=\"ds-scroll-area__vertical-gutter\">&nbsp;<\/div>\n<\/div>\n<table>\n<thead>\n<tr>\n<th><span class=\"\">Parametru<\/span><\/th>\n<th><span class=\"\">Gama tipic\u0103 de produse RSiC<\/span><\/th>\n<th><span class=\"\">Not\u0103 tehnic\u0103<\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong><span class=\"\">Con\u021binutul de SiC<\/span><\/strong><\/td>\n<td><span class=\"\">\u226599 % \u00een greutate%<\/span><\/td>\n<td><strong><span class=\"\">F\u0103r\u0103 agent de sinterizare<\/span><\/strong><span class=\"\"> este afirma\u021bia privind puritatea care face diferen\u021ba; solicita\u021bi verificarea prin ICP sau XRF.<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong><span class=\"\">Densitatea aparent\u0103<\/span><\/strong><\/td>\n<td><span class=\"\">2,0\u20132,75 g\/cm\u00b3<\/span><\/td>\n<td><span class=\"\">O valoare mai mic\u0103 indic\u0103 o porozitate mai mare; densitatea \u00een sine nu constituie un criteriu de clasificare a calit\u0103\u021bii.<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong><span class=\"\">Porozitate deschis\u0103<\/span><\/strong><\/td>\n<td><strong><span class=\"\">10\u201320% (clase func\u021bionale)<\/span><\/strong><\/td>\n<td><span class=\"\">The <\/span><strong><span class=\"\">conectat<\/span><\/strong><span class=\"\"> Natura porozit\u0103\u021bii are o importan\u021b\u0103 decisiv\u0103 pentru permeabilitate \u0219i rezisten\u021ba la \u0219oc termic, nu doar procentul acesteia.<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong><span class=\"\">Rezisten\u021ba la \u00eencovoiere (RT)<\/span><\/strong><\/td>\n<td><span class=\"\">~80\u2013110 MPa<\/span><\/td>\n<td><span class=\"\">RSiC este <\/span><strong><span class=\"\">nu<\/span><\/strong><span class=\"\"> SiC-ul cu cea mai mare rezisten\u021b\u0103; nu \u00eel specifica\u021bi pentru elementele structurale portante, \u00een cazul c\u0103rora SSiC-ul ar fi mai rezistent.<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong><span class=\"\">Rezisten\u021ba la \u00eencovoiere (1200 \u00b0C)<\/span><\/strong><\/td>\n<td><span class=\"\">~90\u2013110 MPa<\/span><\/td>\n<td><span class=\"\">Men\u021binerea rezisten\u021bei la temperatur\u0103 reprezint\u0103 un avantaj esen\u021bial fa\u021b\u0103 de sortimentele care con\u021bin siliciu liber.<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong><span class=\"\">Temperatura maxim\u0103 de func\u021bionare (aer)<\/span><\/strong><\/td>\n<td><strong><span class=\"\">~1600\u20131650 \u00b0C<\/span><\/strong><\/td>\n<td><span class=\"\">\u00cen plus, cinetica de oxidare se accelereaz\u0103; temperatura maxim\u0103 admis\u0103 \u00een atmosfer\u0103 inert\u0103 poate ajunge la ~1800 \u00b0C.<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong><span class=\"\">Temperatura maxim\u0103 de func\u021bionare (\u00een mediu inert)<\/span><\/strong><\/td>\n<td><span class=\"\">~1800 \u00b0C<\/span><\/td>\n<td><span class=\"\">Preciza\u021bi \u00een mod explicit condi\u021biile de atmosfer\u0103 atunci c\u00e2nd compara\u021bi afirma\u021biile furnizorilor.<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong><span class=\"\">Conductivitatea termic\u0103 (RT)<\/span><\/strong><\/td>\n<td><span class=\"\">~23 W\/m\u00b7K<\/span><\/td>\n<td><span class=\"\">Moderat, nu cel mai ridicat dintre clasele de SiC, dar adecvat pentru accesoriile de cuptor \u0219i tuburile radiante.<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong><span class=\"\">CTE (20\u20131000 \u00b0C)<\/span><\/strong><\/td>\n<td><span class=\"\">~4,6\u20134,8 \u00d7 10\u207b\u2076 \/K<\/span><\/td>\n<td><span class=\"\">Expansiunea redus\u0103 constituie baza, la nivel de material, a rezisten\u021bei la \u0219ocul termic.<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong><span class=\"\">Parametrul de \u0219oc termic R1<\/span><\/strong><\/td>\n<td><span class=\"\">~56 K<\/span><\/td>\n<td><span class=\"\">Un indicator comparativ; folosi\u021bi-l pentru a clasifica calit\u0103\u021bile RSiC de la diferi\u021bi furnizori, nu ca un criteriu absolut de acceptare\/respingere.<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong><span class=\"\">Dimensiunea granulelor<\/span><\/strong><\/td>\n<td><span class=\"\">1\u2013150 \u03bcm (longitudinal)<\/span><\/td>\n<td><span class=\"\">Granulele grosiere sunt normale \u00een cazul RSiC \u0219i contribuie la formarea structurii cu pun\u021bi; granulele foarte fine pot indica un alt tip de produs.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Sursele de date au fost integrate din fi\u0219ele tehnice ale furnizorilor; intervalele reflect\u0103 varia\u021biile comerciale obi\u0219nuite \u0219i nu constituie o garan\u021bie pentru fiecare geometrie<\/span><\/strong><span class=\"\">.<\/span><\/p>\n<h2><span class=\"\">\u00cen ce cazuri RSiC este specifica\u021bia corect\u0103 \u2014 \u0219i \u00een ce cazuri este cea gre\u0219it\u0103<\/span><\/h2>\n<h3><span class=\"\">Se va specifica RSiC atunci c\u00e2nd modul de defectare este \u0219ocul termic sau atacul chimic la temperatur\u0103<\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Accesorii pentru cuptor destinate ciclurilor de ardere rapid\u0103.<\/span><\/strong><span class=\"\"> Pl\u0103ci sub\u021biri de a\u0219ezare, grinzi \u0219i role care sunt supuse \u00een mod repetat la \u00eenc\u0103lzire \u0219i r\u0103cire rapide la temperaturi de peste 1450 \u00b0C. Contrac\u021bia redus\u0103 \u00een timpul sinteriz\u0103rii RSiC permite <\/span><strong><span class=\"\">sec\u021biuni cu pere\u021bi sub\u021biri, f\u0103r\u0103 deform\u0103ri<\/span><\/strong><span class=\"\">, iar porozitatea deschis\u0103 permite absorb\u021bia deforma\u021biilor termice care ar provoca fisurarea unui corp mai dens<\/span><span class=\"\">.<\/span><\/p>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Duzele arz\u0103torului \u0219i tuburile radiante.<\/span><\/strong><span class=\"\"> Duzele arz\u0103toarelor din RSiC sunt utilizate \u00een cuptoarele cu navet\u0103, tunel \u0219i cu role, deoarece rezist\u0103 la oxidare \u0219i la cicluri termice de p\u00e2n\u0103 la ~1650\u20131700 \u00b0C f\u0103r\u0103 a prezenta fisurarea care apare \u00een cazul SiC-ului legat prin reac\u021bie, atunci c\u00e2nd siliciul liber devine faza slab\u0103<\/span><span class=\"\">.<\/span><\/p>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Componente pentru cuptoare utilizate \u00een industria semiconductorilor \u0219i a energiei fotovoltaice.<\/span><\/strong><span class=\"\"> RSiC de \u00eenalt\u0103 puritate este utilizat pentru <\/span><strong><span class=\"\">Pl\u0103ci, cuve \u0219i componente interne pentru cuptoare de difuzie LPCVD<\/span><\/strong><span class=\"\"> \u00een cazul \u00een care trebuie controlate contaminarea cu metale \u0219i generarea de particule. Absen\u021ba aditivilor de sinterizare este factorul determinant al specifica\u021biilor \u00een acest caz, nu densitatea<\/span><span class=\"\">.<\/span><\/p>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Tuburi de protec\u021bie a componentelor \u00een cuptoarele cu atmosfer\u0103 controlat\u0103.<\/span><\/strong><span class=\"\"> Porozitatea interconectat\u0103 a RSiC nu afecteaz\u0103 inertitatea chimic\u0103 \u00een majoritatea atmosferelor din cuptoare, iar materialul suport\u0103 gradientele termice de-a lungul peretelui tubului f\u0103r\u0103 a se sf\u0103r\u00e2ma.<\/span><\/p>\n<h3><span class=\"\">Nu specifica\u021bi RSiC atunci c\u00e2nd cerin\u021bele se refer\u0103 la densitate, etan\u0219eitate sau rezisten\u021b\u0103 maxim\u0103<\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Dac\u0103 piesa trebuie s\u0103 asigure o etan\u0219are sub vid, s\u0103 aib\u0103 o suprafa\u021b\u0103 de uzur\u0103 lustruit\u0103 sau s\u0103 suporte o sarcin\u0103 structural\u0103 \u00een cazul \u00een care <\/span><strong><span class=\"\">Densitatea \u0219i rezisten\u021ba superioare ale SSiC<\/span><\/strong><span class=\"\"> sunt propriet\u0103\u021bile determinante, RSiC nu este tipul potrivit. \u00cen mod similar, dac\u0103 piesa este de dimensiuni mari, cu o geometrie complex\u0103 \u0219i cu costuri sensibile la temperaturi sub ~1400 \u00b0C, <\/span><strong><span class=\"\">SiSiC\/RBSiC<\/span><\/strong><span class=\"\"> este, de obicei, alegerea cea mai potrivit\u0103 \u2014 siliciul liber din compozi\u021bia sa umple porozitatea \u0219i permite fabricarea cu o form\u0103 aproape final\u0103, \u00een schimbul unor limit\u0103ri legate de temperatur\u0103 \u0219i de rezisten\u021ba chimic\u0103<\/span><span class=\"\">.<\/span><\/p>\n<h2><span class=\"\">R\u0103spunsuri la \u00eentreb\u0103rile pe care cump\u0103r\u0103torii le pun de fapt \u00eenainte de a trimite o cerere de ofert\u0103<\/span><\/h2>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">RSiC este acela\u0219i lucru cu SSiC?<\/span><\/strong><span class=\"\"> Nu. SSiC este sinterizat f\u0103r\u0103 presiune, cu ajutorul unor aditivi de sinterizare, \u0219i are o structur\u0103 dens\u0103. RSiC este recristalizat f\u0103r\u0103 aditivi \u0219i \u00ee\u0219i p\u0103streaz\u0103 <\/span><strong><span class=\"\">porozitate deschis\u0103 prin proiectare<\/span><\/strong><span class=\"\">. Sunt materiale diferite, cu compromisuri diferite \u00een ceea ce prive\u0219te propriet\u0103\u021bile, nu sinonime<\/span><span class=\"\">.<\/span><\/p>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Se poate utiliza RSiC la temperaturi mai mari de 1650 \u00b0C \u00een aer?<\/span><\/strong><span class=\"\"> Limita practic\u0103 continu\u0103 \u00een aer este de aproximativ <\/span><strong><span class=\"\">1600\u20131650 \u00b0C<\/span><\/strong><span class=\"\">. Unii furnizori indic\u0103 valori mai mari pentru utilizarea pe termen scurt sau \u00een atmosfer\u0103 inert\u0103; solicita\u021bi <\/span><strong><span class=\"\">atmosfera \u0219i durata<\/span><\/strong><span class=\"\"> \u00een spatele oric\u0103rei preten\u021bii superioare.<\/span><\/p>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Porozitatea \u00eenseamn\u0103 c\u0103 piesa este mai slab\u0103 sau de calitate inferioar\u0103?<\/span><\/strong><span class=\"\"> \u00censeamn\u0103 c\u0103 materialul este <\/span><strong><span class=\"\">optimizat prin compromis \u00eentre rezisten\u021ba la \u0219oc termic \u0219i puritate, nu pentru rezisten\u021b\u0103 maxim\u0103<\/span><\/strong><span class=\"\">. Dac\u0103 aplica\u021bia dumneavoastr\u0103 nu necesit\u0103 aceste propriet\u0103\u021bi, un grad mai dens ar putea fi mai potrivit. Porozitatea este o variabil\u0103 de specifica\u021bie, nu o etichet\u0103 care indic\u0103 un defect.<\/span><\/p>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Care este diferen\u021ba dintre RSiC \u0219i SiSiC\/RBSiC \u00een aplica\u021bii chimice?<\/span><\/strong><span class=\"\"> SiSiC\/RBSiC con\u021bine <\/span><strong><span class=\"\">siliciu liber<\/span><\/strong><span class=\"\">, ceea ce limiteaz\u0103 utilizarea pe termen lung la temperaturi mai mari de ~1400 \u00b0C \u0219i reduce rezisten\u021ba la mediile alcaline puternice \u0219i la cele care con\u021bin acid fluorhidric. RSiC nu con\u021bine siliciu liber \u0219i nici o faz\u0103 sticloas\u0103 la limitele dintre granule, motiv pentru care este preferat atunci c\u00e2nd <\/span><strong><span class=\"\">iner\u021bia chimic\u0103 la temperatur\u0103<\/span><\/strong><span class=\"\"> este o cerin\u021b\u0103<\/span><span class=\"\">.<\/span><\/p>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Piesele din RSiC pot fi furnizate cu geometrii personalizate, nu doar sub form\u0103 de pl\u0103ci \u0219i tuburi standard?<\/span><\/strong><span class=\"\"> Da, \u00een limitele impuse de procesul de recristalizare. RSiC este foarte potrivit pentru <\/span><strong><span class=\"\">forme cu pere\u021bi sub\u021biri \u0219i suprafa\u021b\u0103 de contact mare<\/span><\/strong><span class=\"\"> cum ar fi pl\u0103cile \u0219i grinzile de fixare, \u00eens\u0103 sec\u021biunile extrem de groase sau cavit\u0103\u021bile interne complexe pot fi realizate mai economic folosind o o\u021beluri lipite prin reac\u021bie. Trimite\u021bi-ne un desen \u0219i condi\u021biile de func\u021bionare pentru o evaluare a fezabilit\u0103\u021bii de fabrica\u021bie.<\/span><\/p>","protected":false},"excerpt":{"rendered":"<p>Recrystallized Silicon Carbide (RSiC \/ RSC) \u2014 for Kiln Furniture, Burner Nozzles &amp; High-Temperature Structural Parts If your furnace cycle runs above 1450\u00b0C, involves rapid heating\/cooling, and a sintering aid or free-silicon phase would become the weak link \u2014 this is the material page you should read before you specify. RSiC is not \u201canother SiC&hellip;&nbsp;<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"off","neve_meta_content_width":70,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","ngg_post_thumbnail":0,"footnotes":""},"categories":[23],"tags":[],"class_list":["post-735","post","type-post","status-publish","format-standard","hentry","category-recrystallized-silicon-carbide"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/siliconcarbide.net\/ro\/wp-json\/wp\/v2\/posts\/735","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/siliconcarbide.net\/ro\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/siliconcarbide.net\/ro\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/siliconcarbide.net\/ro\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/siliconcarbide.net\/ro\/wp-json\/wp\/v2\/comments?post=735"}],"version-history":[{"count":1,"href":"https:\/\/siliconcarbide.net\/ro\/wp-json\/wp\/v2\/posts\/735\/revisions"}],"predecessor-version":[{"id":736,"href":"https:\/\/siliconcarbide.net\/ro\/wp-json\/wp\/v2\/posts\/735\/revisions\/736"}],"wp:attachment":[{"href":"https:\/\/siliconcarbide.net\/ro\/wp-json\/wp\/v2\/media?parent=735"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/siliconcarbide.net\/ro\/wp-json\/wp\/v2\/categories?post=735"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/siliconcarbide.net\/ro\/wp-json\/wp\/v2\/tags?post=735"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}