Indima ephambili ye-silicon carbide powder eluhlaza kwizinto eziphikisayo
I-silicon carbide powder eluhlaza, igama livakala linzima. Ngokusisiseko luhlobo oluthilei-silicon carbide (SiC), enyibilikiswa ngaphezu kwe-2000 degrees kwisithando somlilo esinezixhobo eziluhlaza ezifana nesanti ye-quartz kunye ne-petroleum coke. Yahluke kwizinto eziqhelekileyoi-silicon carbide emnyama, inolawulo oluchanekileyo lwenkqubo kwinqanaba lokugqibela lokunyibilika, kunye nokungcola okumbalwa kakhulu kunye nokucoceka kwe-crystal ephezulu, ngoko ke ibonisa umbala oyingqayizivele ohlaza okanye oluhlaza. Oku "kucoceka" kukunika phantse ubunzima obugqithisileyo (ubunzima be-Mohs buphezulu njenge-9.2-9.3, okwesibini kuphela kwidayimane kunye ne-boron carbide) kunye nokugqithiswa kwe-thermal conductivity kunye namandla aphezulu obushushu. Kwibala lezinto eziphikisayo, "lithambo elinzima" elinokumelana, ukulwa, ukushisa kunye nokwakha.
Ngoko ke, le powder eluhlaza ingabonisa njani amandla ayo kwihlabathi elinzima lezinto eziphikisayo kwaye ibe "yindoda ebalulekileyo" eyimfuneko?
Ukuphucula amandla kwaye uphose "amathambo ensimbi" aphezulu obushushu: Izinto eziphikisayo zoyika kakhulu "ukungakwazi ukumelana" namaqondo okushisa aphezulu, zibe zithambile kwaye ziwa.I-silicon carbide micropowder eluhlazainobunzima obuphezulu kakhulu kunye namandla abalaseleyo obushushu obuphezulu. Ukuyongeza kwii-castables ezahlukeneyo ze-refractory, izixhobo ze-ramming okanye izitena kufana nokongeza i-mesh yentsimbi ephezulu kwikhonkrithi. Iyakwazi ukwenza i-skeleton yenkxaso eqinile kwi-matrix, ixhathisa kakhulu i-deformation kunye nokuthambisa izinto phantsi komthwalo ophezulu weqondo lokushisa. Iintambo zentsimbi yokuqhuma kwentsimbi yesityalo esikhulu sensimbi zisebenzisa izinto eziqhelekileyo ngaphambili, eziye zatshitshiswa ngokukhawuleza, izinga lokuhamba kwentsimbi lingenakunyuswa, kunye nokugcinwa rhoqo kulibaziseka ukuveliswa. Kamva, kwenziwa impumelelo yobugcisa, kunye nomlinganiselo wei-silicon carbide micropowder eluhlaza yanda kakhulu. “Heyi, iyamangalisa!” Kamva umalathisi wendibano yokusebenzela wakhumbula oku, “Xa kwakufakwa intsimbi entsha, intsimbi enyibilikisiweyo yatyhutyha, icala lomjelo ngokucacileyo ‘laqutyulwa’, isantya sokuhamba kwentsimbi sajikela phezulu, yaye inani lamaxesha okulungisa lancitshiswa ngaphezu kwesiqingatha, yaye yonke imali eyayiyongiwe yayiyimali yokwenene!” Obu bunzima busisiseko sobomi obude bezixhobo zobushushu obuphezulu.
Ukuphucula ukuqhutyelwa kokushisa kunye nokufaka "i-heat sink" kwizinto eziphathekayo: Ukufudumala okungaphezulu kwe-heat-refractory material, kungcono! Kwiindawo ezinjengeengcango ze-oven ye-coke kunye neendonga ze-aluminium ze-electrolytic zecala, izinto ngokwazo kufuneka ziqhube ngokukhawuleza ukushisa kwangaphakathi ukukhusela ubushushu bendawo ukuba bube phezulu kwaye bonakaliswe. I-thermal conductivity ye-silicon carbide micropowder eluhlaza ngokuqinisekileyo "umfundi ogqwesileyo" phakathi kwezinto ezingezizo ezentsimbi (iqondo lobushushu begumbi le-thermal conductivity coefficient inokufikelela ngaphezulu kwe-125 W/m·K, ephindwe kaninzi kunezitena zodongwe eziqhelekileyo). Ukuyongeza kwizinto ezichasayo kwindawo ethile kufana nokufaka "umbhobho wokushisa" osebenzayo kwizinto eziphathekayo, ezinokuthi ziphucule kakhulu i-conductivity ye-thermal, incedise ukushisa ngokukhawuleza kunye nokutshatyalaliswa ngokulinganayo, kwaye ugweme ukugqithiswa kwendawo kunye ne-peeling okanye umonakalo obangelwa "i-heartburn".
Ukomeleza ukuxhathisa ukothuka kwe-thermal kwaye uphuhlise ukukwazi "ukuhlala uzolile xa ujongana notshintsho": Enye yezona "zibulala" ziyinkathazo zezixhobo eziphikisayo kukupholisa ngokukhawuleza kunye nokufudumeza. Isithando somlilo sivuliwe kwaye sivaliwe, kwaye iqondo lokushisa liguquguquka ngamandla, kwaye izinto eziqhelekileyo zilula "ukuqhuma" kunye nokucima.I-silicon carbide eluhlazaI-micropowder ine-coefficient encinci yokwandisa i-thermal kunye ne-conductivity ye-thermal ekhawulezayo, enokukhawuleza ukulinganisa uxinzelelo olubangelwa ngumahluko weqondo lokushisa. Ukuyizisa kwinkqubo ye-refractory kunokuphucula kakhulu amandla ezinto eziphathekayo ukuchasana nokutshintsha kweqondo lokushisa ngokukhawuleza, oko kukuthi, "i-thermal shock resistance". Intsimbi yomlomo we-onti enokugalelwa kwihonti yesamente ejikelezayo iphantsi kweyona ngqele iqhaqhazelisa amazinyo, yaye ubomi bayo obufutshane yayiyingxaki ekudala ikho. Omnye unonjineli wokwakha iziko onamava wandixelela oku: “Ukususela ekusetyenzisweni kwezinto zokuphoswa ezikumgangatho ophezulu ezinesilicon carbide micropowder njengowona mxube uphambili nomgubo, umphumo uye waba ngoko nangoko.” imizamo!” Oku "kuzola" kukujongana namahla ndinyuka kwimveliso.
Ngokubai-silicon carbide micropowder eluhlaza idibanisa amandla aphezulu, i-thermal conductivity ephezulu, ukuxhathisa ukothuka kwe-thermal, kunye nokumelana nokukhukuliseka okunamandla, kuye kwaba "ngumlingani womphefumlo" ekuqulunqweni kwezixhobo zanamhlanje ezisebenza kakuhle. Ukusuka kwiziko eliqhumayo, abaguquli, imisele yentsimbi, kunye neitanki ze-torpedo kwintsimbi kunye nesinyithi sesinyithi ukuya kwiiseli ze-electrolytic kwi-metallurgy engasebenziyo; ukusuka kwiindawo eziphambili zezibane zesamente kunye nezibane zeglasi kushishino lwemathiriyeli yokwakha ukuya kwiziko ezonakalisa kakhulu kwiindawo zoshishino lwemichiza, amandla ombane, kunye nokutshisa inkunkuma, kwanokugalela iikomityi kunye nezitena zentsimbi ezithululwayo zokugalela… Ifakwe ngokuthula kuzo zonke izitena eziphikisayo kunye nesikwele ngasinye esine-castable, inikezela ukukhuselwa okuqinileyo "kwintliziyo" yoshishino - ii-kilns eziphezulu zokushisa.
Ngokuqinisekileyo, "ukulima" kwe-silicon carbide micropowder eluhlaza ngokwayo akulula. Ukususela ekukhethweni kwezinto eziluhlaza, ukulawulwa ngokuchanekileyo kwenkqubo yokunyibilikisa isithando somlilo (ukuqinisekisa ubunyulu kunye nohlaza), ukutyumza, ukugaya, ukucoca kunye nokususwa kokungcola, ukuhlelwa kwe-hydraulic okanye ukuhamba komoya okuchanekileyo, ukupakishwa okungqongqo ngokuhambelana nokusabalalisa ubungakanani bamasuntswana (ukusuka kwii-microns ezimbalwa ukuya kumakhulu ama-microns), inyathelo ngalinye lihambelana nokusebenza okuzinzile kwemveliso yokugqibela. Ngokukodwa, ukucoceka, ukusabalalisa ubungakanani be-particle size shape ye-micropowder ichaphazela ngokuthe ngqo i-dispersibility yayo kunye nesiphumo kwizinto eziphikisayo. Kunokuthiwa umgangatho ophezulu we-silicon carbide micropowder ngokwayo imveliso yokudibanisa iteknoloji kunye nobugcisa.