Iinkqubo ezahlukeneyo ze-cryogenic zibangela utshintsho kwiipropati zei-carbide enesamente, kunye neenguqu kwiipropati zihambelana ngokusondeleyo nokuguquka kwe-microstructure yayo.Ngoko ke, kuyimfuneko ukuhlalutya ngokuqhubekayo impembelelo yonyango lwe-cryogenic kwi-microstructure ye-carbide ene-cemented.
I-microstructure eqhelekileyo ye-WC-Co cemented carbide yile ilandelayo: isigaba - i-WC (isigaba esinzima);isigaba β - Co (isigaba sokubopha);y isigaba – (TaC, TiC, NbC, WC) equicubic lattice mixed carbides ;eta isigaba-decarburized isigaba (CoW, C, Co. W. C).UGill et al.wanika umzobo wesicwangciso sezigaba ezi-a kunye no-β, njengoko kubonisiwe kuMfanekiso 6. Phakathi kwazo, i-α isigaba-WC (isigaba esinzima) sithatha indawo ephambiliimathiriyeli ye-carbide enesamentengendlela ye-skeleton eqinile, ngelixa i-β phase-Co (isigaba se-binder) idibene ngokusondeleyo ne-tungsten carbide (WC) njengegridi.
Xa i-carbide ene-cemented ipholile emva kokucwiliswa kwe-sintering, ekubeni isixa esikhulu se-W kunye ne-C sichithwa kwi-Co, isigaba sobushushu obuphezulu α-Co kwiqondo lobushushu begumbi sisekho ngokuzinzileyo.Xa iqondo lobushushu liqhubeka nokuhla, uguquko lwesigaba se-martensitic ukusuka kwi-cubic α-Co egxininiswe kubuso ukuya kwi-hexagonal evaliweyo ene-hexagonal ε-Co kwenzeka kwisigaba se-bonding -Co.Kuyabonakala ukuba xa ubushushu butshintsha, kukho utshintsho kwi-microstructure yei-carbide enesamente, enika ithuba lonyango lwe-cryogenic ukukhuthaza ukuguqulwa kwesigabai-carbide enesamente.Izifundo ezininzi zijolise kutshintsho kwi-microstructure yei-carbide enesamentengaphambi nangemva konyango lwe-cryogenic kwaye uhlolisise indlela yokuguquguquka kwe-microscopic xa iipropati ze-macroscopic zitshintsha.
Ixesha lokuposa: Mar-06-2024
