Karburidi i silicit i lidhur me nitrid nuk merr po aq v\u00ebmendje sa SiC i lidhur me reaksion ose SiC i sinteruar. Kjo \u00ebsht\u00eb n\u00eb rregull. Ai \u00ebsht\u00eb i z\u00ebn\u00eb duke mbajtur vagon\u00ebt e furr\u00ebs, duke veshur qelizat e aluminit dhe duke p\u00ebrballuar g\u00ebrryerje q\u00eb tullat e lidhura me oksid nuk mund t'i mbijetojn\u00eb. Kam kaluar mjaft koh\u00eb pran\u00eb NSiC \u2014 shkruar edhe NBSiC ose SiC i lidhur me nitrid \u2014 p\u00ebr ta th\u00ebn\u00eb qart\u00eb: nuk \u00ebsht\u00eb nj\u00eb \u201cversion buxhetor\u201d i SiC-s\u00eb s\u00eb dendur. \u00cbsht\u00eb nj\u00eb material tjet\u00ebr me nj\u00eb detyr\u00eb tjet\u00ebr.<\/p>\n
Receta \u00ebsht\u00eb e thjesht\u00eb n\u00eb let\u00ebr. Merrni grimca karbidi silikoni, shtoni silikon metalik, formoni form\u00ebn, pastaj pjekeni n\u00eb azot. Silikoni kthehet n\u00eb nitrid silikoni dhe ky nitrid b\u00ebhet lidh\u00ebsi q\u00eb mban s\u00eb bashku grimcat e SiC. Trupat tipik\u00eb arrijn\u00eb rreth 70\u201380% SiC dhe 20\u201330% Si\u2083N\u2084. Ngurt\u00ebsimi gjat\u00eb nitrimit \u00ebsht\u00eb i vog\u00ebl, prandaj mund t\u00eb prodhoni pllaka t\u00eb m\u00ebdha, tulla dhe forma t\u00eb \u00e7uditshme pa dram\u00ebn e shtremb\u00ebrimit q\u00eb hasin disa qeramika t\u00eb tjera.<\/p>\n
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Dend\u00ebsia zakonisht \u00ebsht\u00eb n\u00eb intervalin 2.6\u20132.8 g\/cm\u00b3. Poroziteti i hapur te gradat standarde shpesh \u00ebsht\u00eb rreth 12\u201317%. Ky porozitet \u00ebsht\u00eb gj\u00ebja e par\u00eb q\u00eb njer\u00ebzit e keqkuptojn\u00eb. Nuk \u00ebsht\u00eb domosdoshm\u00ebrisht nj\u00eb defekt. \u00cbsht\u00eb arsyeja pse materiali mund t\u00eb p\u00ebrballoj\u00eb shokun termik q\u00eb do t\u00eb \u00e7ar\u00eb nj\u00eb trup plot\u00ebsisht t\u00eb dendur, dhe pse \u00ebsht\u00eb m\u00eb i leht\u00eb se SiC i lidhur me reaksion n\u00eb nj\u00eb karroc\u00eb furre. Disa klasa moderne ripjeken ose formulohen p\u00ebr t\u00eb mbyllur poret e sip\u00ebrfaqes me nj\u00eb shtres\u00eb silik\u00eb. Ato sillen m\u00eb shum\u00eb si nj\u00eb material refraktar i vulosur sesa si nj\u00eb sfungjer.<\/p>\n
Forca \u00ebsht\u00eb m\u00eb e ul\u00ebt se ajo e SiSiC t\u00eb dendur. Moduli i thyerjes n\u00eb temperatur\u00eb dhome p\u00ebr klasat e zakonshme t\u00eb furr\u00ebs dhe t\u00eb materialeve refraktare mund t\u00eb jet\u00eb dhjet\u00ebra MPa, jo 250 MPa q\u00eb d\u00ebgjoni p\u00ebr trar\u00ebt e lidhur me reaksion. Pjesa e dobishme \u00ebsht\u00eb ajo q\u00eb ndodh n\u00eb temperatur\u00eb. Karbidi i silicit i lidhur me nitrid ruan kapacitetin mbajt\u00ebs t\u00eb ngarkes\u00ebs shum\u00eb m\u00eb lart se pika ku silici i lir\u00eb n\u00eb SiC t\u00eb lidhur me reaksion fillon t\u00eb zbutet. Sh\u00ebrbimi praktik shpesh citohet n\u00eb intervalin 1450\u20131600 \u00b0C, n\u00eb var\u00ebsi t\u00eb atmosfer\u00ebs, ngarkes\u00ebs dhe n\u00ebse materiali \u00ebsht\u00eb nj\u00eb trup i im\u00ebt i derdhur me rr\u00ebshqitje apo nj\u00eb tull\u00eb m\u00eb e trash\u00eb e shtypur. N\u00ebse p\u00ebrdorni numrin e marketingut pa kontrolluar detyr\u00ebn, do t\u00eb p\u00ebrkulni ende nj\u00eb pllak\u00eb.<\/p>\n
Konduktiviteti termik \u00ebsht\u00eb i mir\u00eb krahasuar me cordieritin ose mullitin, zakonisht m\u00eb i ul\u00ebt se ai i RBSiC-s\u00eb s\u00eb dendur. Zgjerimi \u00ebsht\u00eb i ul\u00ebt. Ky kombinim, s\u00eb bashku me lidhjen nitride, \u00ebsht\u00eb arsyeja pse mobiljet mbijetojn\u00eb ngrohjen dhe ftohjen, n\u00eb vend q\u00eb t\u00eb zhvillojn\u00eb nj\u00eb \u00e7arje t\u00eb holl\u00eb t\u00eb mart\u00ebn.<\/p>\n
Kimikisht, ai \u00ebsht\u00eb i q\u00ebndruesh\u00ebm n\u00eb shum\u00eb atmosfera industriale. Alumin i shkrir\u00eb dhe kryoliti jan\u00eb shembulli i njohur: SiC i lidhur me nitrid u b\u00eb materiali i preferuar p\u00ebr muret an\u00ebsore n\u00eb qelizat e reduktimit, sepse karboni digjej dhe tullat e oksidit nuk zgjatnin. Ai gjithashtu p\u00ebrballon m\u00eb mir\u00eb g\u00ebrvishtjet, shum\u00eb llama dhe gazin e ndotur n\u00eb ciklon\u00eb sesa nj\u00eb tull\u00eb SiC e lidhur me balt\u00eb. Nuk \u00ebsht\u00eb i pavdeksh\u00ebm. Alkalet e forta, nitridimi i dob\u00ebt me silikon t\u00eb lir\u00eb t\u00eb mbetur dhe oksidimi i pakujdessh\u00ebm n\u00eb faqen e nxeht\u00eb do ta konsumojn\u00eb gjithsesi.<\/p>\n
Eqipamenti i furr\u00ebs \u00ebsht\u00eb puna e p\u00ebrditshme. Blloqe, pjat\u00eb, vendos\u00ebse, shtylla dhe trar\u00eb n\u00eb artikuj sanitar\u00eb, en\u00eb tavoline, porcelan elektrik dhe qeramik\u00eb teknike. Krahasuar me kordieritin, arrini temperatura m\u00eb t\u00eb larta, ngarkes\u00eb m\u00eb t\u00eb mir\u00eb, seksione m\u00eb t\u00eb holla dhe m\u00eb pak mas\u00eb t\u00eb vdekur n\u00eb furr\u00eb. Ky pik\u00eb i fundit nuk \u00ebsht\u00eb poezi. M\u00eb pak mas\u00eb pajisjesh do t\u00eb thot\u00eb m\u00eb shum\u00eb mallra dhe m\u00eb pak karburant p\u00ebr \u00e7do cik\u00ebl.<\/p>\n
Alumini \u00ebsht\u00eb sht\u00ebpia tjet\u00ebr e madhe. Blloqet an\u00ebsore n\u00eb linjat e tenxhereve kan\u00eb nevoj\u00eb p\u00ebr konduktivitet termik, forc\u00eb mekanike dhe rezistenc\u00eb ndaj kimis\u00eb s\u00eb banj\u00ebs. NSiC e kryen k\u00ebt\u00eb pun\u00eb me nj\u00eb kosto q\u00eb impiantet mund ta p\u00ebrballojn\u00eb. Zona t\u00eb konsumit n\u00eb pjes\u00ebn e poshtme t\u00eb tubacionit t\u00eb furr\u00ebs s\u00eb shkrirjes, linjat e mbrojtjes nga konsumimi n\u00eb impiantet e konvertimit t\u00eb mbeturinave n\u00eb energji, dhe mbulesat ciklonike n\u00eb minierat ose n\u00eb sektorin e energjis\u00eb ndjekin t\u00eb nj\u00ebjt\u00ebn logjik\u00eb: kokrra e fort\u00eb e SiC, nj\u00eb lidhje q\u00eb i reziston nxeht\u00ebsis\u00eb, dhe nj\u00eb form\u00eb q\u00eb mund ta instalosh si tull\u00eb ose si pjes\u00eb e derdhur.<\/p>\n
Pjes\u00ebt e konsumit shfaqen gjithashtu \u2014 pllaka, noz\u00ebla, pjes\u00eb pompe \u2014 kur mjedisi \u00ebsht\u00eb i nxeht\u00eb dhe g\u00ebrryes, por nuk keni nevoj\u00eb p\u00ebr porozitet thuajse zero t\u00eb SiC t\u00eb lidhur me reaksion. N\u00ebse slurry \u00ebsht\u00eb i ftoht\u00eb dhe armiku i vet\u00ebm \u00ebsht\u00eb g\u00ebrryerja rr\u00ebshqit\u00ebse, nj\u00eb veshje e dendur SiSiC shpesh zgjat m\u00eb gjat\u00eb. N\u00ebse armiku \u00ebsht\u00eb nxeht\u00ebsia, plus g\u00ebrryerja, plus ciklet termike, NSiC fillon t\u00eb duket zgjidhja e zgjuar.<\/p>\n
Karburidi i silicit i lidhur me reaksion \u00ebsht\u00eb m\u00eb i dendur, m\u00eb i fort\u00eb dhe m\u00eb i ngusht\u00eb. Ai prodhon rreze, rrota dhe pjes\u00eb precize t\u00eb konsumit t\u00eb shk\u00eblqyera n\u00ebn rreth 1350\u20131380 \u00b0C. Mbi at\u00eb temperatur\u00eb, silici i lir\u00eb \u00ebsht\u00eb sundimtari. NSiC nuk ka at\u00eb rezervuar metali n\u00eb mikrostruktur\u00eb, k\u00ebshtu q\u00eb ai vazhdon t\u00eb funksionoj\u00eb n\u00eb temperatura m\u00eb t\u00eb larta. Ai \u00ebsht\u00eb gjithashtu zgjedhja praktike p\u00ebr forma t\u00eb m\u00ebdha refraktare, ku infiltrimi i silicit n\u00eb nj\u00eb bllok gjigant nuk ka kuptim.<\/p>\n
SiC i rikristalizuar nxehet edhe m\u00eb shum\u00eb dhe mbetet m\u00eb i past\u00ebr n\u00eb disa atmosfera furre, por \u00ebsht\u00eb m\u00eb poroz dhe zakonisht m\u00eb i dob\u00ebt. SiC i lidhur me oksid \u00ebsht\u00eb m\u00eb i lir\u00eb dhe humbet n\u00eb rezistenc\u00eb ndaj nxeht\u00ebsis\u00eb dhe n\u00eb rezistenc\u00eb ndaj goditjeve. SiC i sinteruar \u00ebsht\u00eb kush\u00ebriri premium i dendur dhe kushton si i till\u00eb. NSiC gjendet n\u00eb segmentin ku impiantet kan\u00eb nevoj\u00eb p\u00ebr performanc\u00ebn e SiC n\u00eb copa t\u00eb m\u00ebdha pa bler\u00eb nj\u00eb qeramik\u00eb laboratorike.<\/p>\n
Nitrimi i paplot\u00eb \u00ebsht\u00eb vras\u00ebsi i heshtur. Nj\u00eb bllok mund t\u00eb duket i mir\u00eb nga jasht\u00eb dhe t\u00eb fsheh\u00eb silikon t\u00eb mbetur ose nj\u00eb b\u00ebrtham\u00eb t\u00eb dob\u00ebt. N\u00eb nj\u00eb qeliz\u00eb alumini kjo shkaktohet nga korrozion i hersh\u00ebm. N\u00eb nj\u00eb pllak\u00eb furre ajo kthehet n\u00eb oksidim q\u00eb e b\u00ebn sip\u00ebrfaqen pluhur dhe ul forcat. Lag\u00ebshtia n\u00eb nj\u00eb trup poroz, e ndjekur nga nj\u00eb pjekje e shpejt\u00eb, \u00ebsht\u00eb nj\u00eb tjet\u00ebr klasik. Avulli nuk i intereson orari juaj i prodhimit.<\/p>\n
Njer\u00ebzit gjithashtu mbingarkojn\u00eb me nxeht\u00ebsi t\u00eb tep\u00ebrt dhe me mendime t\u00eb dendura nj\u00eb grad\u00eb poroze. NSiC nuk \u00ebsht\u00eb nj\u00eb tub i vulosur. N\u00ebse atmosfera mund t\u00eb dep\u00ebrtoj\u00eb brenda, oksidimi dhe kimia e kondensatit kan\u00eb r\u00ebnd\u00ebsi. Dhe n\u00ebse aplikimi \u00ebsht\u00eb llum me shpejt\u00ebsi t\u00eb lart\u00eb n\u00eb temperatur\u00eb modeste, mund t\u00eb keni bler\u00eb nj\u00eb sigurim kund\u00ebr shokut termik q\u00eb nuk ju duheshte.<\/p>\n
Mos d\u00ebrgoni \u201cbllok SiC\u201d dhe t\u00eb shpresoni. Quajeni t\u00eb lidhur me nitrid. Jepni temperatur\u00ebn maksimale, atmosfer\u00ebn, ngarkes\u00ebn, koh\u00ebn e ciklit dhe kimin\u00eb \u2014 banj\u00ebn e aluminit, avullin alkalin, hirin e fluturimit, pikimin e glazur\u00ebs, \u00e7do gj\u00eb q\u00eb prek pjes\u00ebn. K\u00ebrkoni dend\u00ebsin\u00eb, porozitetin e duksh\u00ebm, modulin e thyerjes n\u00eb nxeht\u00ebsi dhe silicin e lir\u00eb t\u00eb mbetur. P\u00ebr pajisjet e furr\u00ebs, pyesni n\u00ebse pjesa \u00ebsht\u00eb formuar me derdhje balte me kokrriza t\u00eb im\u00ebta apo \u00ebsht\u00eb shtypur me kokrriza t\u00eb trasha. K\u00ebto dy produkte nuk konsumojn\u00eb dhe nuk p\u00ebrcjellin nxeht\u00ebsin\u00eb n\u00eb t\u00eb nj\u00ebjt\u00ebn m\u00ebnyr\u00eb.<\/p>\n
Sic i lidhur me nitrid \u00ebsht\u00eb materiali q\u00eb p\u00ebrdorni kur mobiljet me oksid jan\u00eb lodhur, SiC i lidhur me reaksion \u00ebsht\u00eb tep\u00ebr i kufizuar nga temperatura ose shum\u00eb i shtrenjt\u00eb n\u00eb seksione t\u00eb m\u00ebdha, dhe impianti duhet t\u00eb vazhdoj\u00eb t\u00eb funksionoj\u00eb. Nuk \u00ebsht\u00eb irhetorik. \u00cbsht\u00eb pllaka q\u00eb del e drejt\u00eb nga furra, muri an\u00ebsor q\u00eb nuk shembet dhe veshja q\u00eb mbetet aty pas fushat\u00ebs s\u00eb fundit. Specifikoni klas\u00ebn sipas detyr\u00ebs dhe ajo mbetet ashtu.<\/p>","protected":false},"excerpt":{"rendered":"
Hotter Than RBSiC, Tougher Than the Old Bricks: A Practical Guide to Nitride Bonded Silicon Carbide Nitride bonded silicon carbide does not get the same attention as reaction bonded SiC or sintered SiC. That is fine. It is busy holding up kiln cars, lining aluminum cells, and taking abrasion that oxide-bonded brick cannot survive. I […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-54","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/nitridebondedsic.com\/sq\/wp-json\/wp\/v2\/posts\/54","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nitridebondedsic.com\/sq\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nitridebondedsic.com\/sq\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nitridebondedsic.com\/sq\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nitridebondedsic.com\/sq\/wp-json\/wp\/v2\/comments?post=54"}],"version-history":[{"count":2,"href":"https:\/\/nitridebondedsic.com\/sq\/wp-json\/wp\/v2\/posts\/54\/revisions"}],"predecessor-version":[{"id":56,"href":"https:\/\/nitridebondedsic.com\/sq\/wp-json\/wp\/v2\/posts\/54\/revisions\/56"}],"wp:attachment":[{"href":"https:\/\/nitridebondedsic.com\/sq\/wp-json\/wp\/v2\/media?parent=54"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nitridebondedsic.com\/sq\/wp-json\/wp\/v2\/categories?post=54"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nitridebondedsic.com\/sq\/wp-json\/wp\/v2\/tags?post=54"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}