Zeziphi izigaba ezine kwinkqubo ye-vacuum sintering ye-Cemented Carbid

I-carbide enesamentei-vacuum sintering yinkqubo apho i-sintering yenziwa kuxinzelelo olungaphantsi koxinzelelo lwe-atmospheric.Le nkqubo ibandakanya ukususwa kweplasticizer, degassing, solid phase sintering, liquid phase sintering, alloying, densification, and dissolution precipitation.Makhe sijonge kwiinkqubo ezine eziphambili ze-cemented carbide vacuum sintering:

①Inqanaba lokususa iPlastiki

Inqanaba lokususa iplasticizer liqala kubushushu begumbi kwaye linyuke ukuya kuma 200°C.I-gas adsorbed phezu kwe-powder particles kwi-billet ihlukaniswe ukusuka kwi-surface ye-particle ngokushisa kwaye ibalekela kwi-billet ngokuqhubekayo.I-plasticizer kwi-billet iyatshisa ukubaleka kwi-billet.Ukugcina inqanaba eliphezulu le-vacuum kunceda ukukhululwa kunye nokuphunyuka kweegesi.Iindidi ezahlukeneyo zeplastiki ziphantsi kokutshintsha kobushushu ekusebenzeni kuyahluka, ukuphuhliswa kwenkqubo yokususa i-plasticizer kufuneka kumiselwe ngokweemeko ezithile zovavanyo.Ubushushu beplastiki yegesi ngokubanzi bungaphantsi kwama-550 ℃.

② Isigaba esikhutshwe ngaphambili

Isigaba sangaphambili se-sintering sibhekisela kwiqondo lokushisa eliphezulu lokutshisa ngaphambi kokuba i-sintering, ukwenzela ukuba i-oksijini yekhemikhali kwi-particle powder kunye nokunciphisa i-carbon reaction reaction ukuvelisa i-carbon monoxide gas eshiya i-billet ye-press, ukuba le gesi ayikwazi ukukhutshwa xa isigaba solwelo sibonakala, iya kuba yintsalela ye-pore evaliweyo kwi-alloy, nokuba i-pressurized sintering, kunzima ukuyiphelisa.Kwelinye icala, ubukho be-oxidation buya kuchaphazela kakhulu ukumanzisa kwesigaba solwelo ukuya kwinqanaba elinzima kwaye ekugqibeleni kuchaphazele inkqubo yoxinaniso.i-carbide enesamente.Ngaphambi kokuba kuvele isigaba solwelo, kufuneka sisuswe ngokwaneleyo kwaye kusetyenziswe eyona vacuum iphezulu.

③ inqanaba lobushushu eliphezulu sintering

Ukushisa kwe-sintering kunye nexesha le-sintering ziyimilinganiselo yenkqubo ebalulekileyo yoxinaniso lwe-billet, ukubunjwa kwesakhiwo esilinganayo kunye nokufumana iipropati ezifunekayo.Ukushisa kwe-sintering kunye nexesha le-sintering lixhomekeke ekubunjweni kwe-alloy, ubungakanani bepowder, amandla okugaya umxube kunye nezinye izinto, kwaye zilawulwa yilo lonke uyilo lwezinto.

④Inqanaba lokupholisa

Isigaba sokupholisa apho izinga lokupholisa lichaphazela ukubunjwa kunye nesakhiwo sesigaba esibophekileyo se-alloy kwaye sivelise uxinzelelo lwangaphakathi.Izinga lokupholisa kufuneka libe kwimeko elawulwayo.I-Sintering hot isostatic pressing yinkqubo entsha ye-sintering, eyaziwa ngokuba yi-low-pressure sintering, apho imveliso ixinzezeleka ngoxinzelelo oluthile lwegesi ukukhuthaza ukuxinana phantsi kweemeko zokugqitywa kwe-degassing, iipores kumphezulu we-billet ecinezelweyo. ziye zavalwa, kwaye isigaba sokubopha sihlala simanzi.