Ukukhishwa kwe-PDC

Bisizinda

I-Polycrystalline diamond compacts (PDC) isetshenziswe ekusetshenzisweni kwezimboni, okuhlanganisa izinhlelo zokusebenza zokumba amatshe kanye nezicelo zomshini wensimbi. Ama-compact anjalo abonise izinzuzo ngaphezu kwezinye izinhlobo zezinto zokusika, ezifana nokumelana nokugqoka okungcono kanye nokumelana nomthelela. I-PDC ingakhiwa ngokufaka izinhlayiya zedayimane ngazinye ndawonye ngaphansi kwezimo zengcindezi ephezulu kanye nezinga lokushisa eliphezulu (HPHT), phambi kwe-catalyst/solvent ekhuthaza ukuhlangana kwedayimane nedayimane. Ezinye izibonelo ze-catalyst/solvents ze-sintered diamond compacts yi-cobalt, i-nickel, insimbi, nezinye izinsimbi zeQembu VIII. Ama-PDC ajwayele ukuba nedayimane elingaphezu kwamashumi ayisikhombisa ekhulwini ngevolumu, cishe amaphesenti angamashumi ayisishiyagalombili kuya cishe angamashumi ayisishiyagalolunye nesishiyagalombili ekhulwini. I-PDC iboshelwe ku-substrate, ngaleyo ndlela yakhe isisiki se-PDC, esivame ukufakwa ngaphakathi, noma sigxunyekwe, ethuluzini lokudonsa amanzi elifana ne-drill bit noma i-reamer.

Ukukhishwa kwe-PDC

Abasiki be-PDC benziwa nge-tungsten carbide substrate kanye nempushana yedayimane ngaphansi kwezinga lokushisa eliphezulu nokucindezela okukhulu. UCobalt ungumxhumanisi. Inqubo ye-leaching isusa ngamakhemikhali i-cobalt catalyst ehlanganisa isakhiwo se-polycrystalline. Umphumela uba itafula ledayimane elinokumelana okuthuthukisiwe ekonakaleni okushisayo kanye nokuguga okuhuquzelayo, okuholela ekuphileni okuwusizo komsiki ende.. Le nqubo ivamise ukuqedwa emahoreni angaphezu kwayi-10 ngaphansi kuka-500 kuya ku-600 degree ngesithando somlilo. Inhloso ye-leached ukuthuthukisa ukuqina kwe-PDC. Imvamisa nje i-PDC yensimu kawoyela yamukela lobu buchwepheshe, ngoba indawo yokusebenza yensimu kawoyela iyinkimbinkimbi kakhulu.

KafushaneUmlando

Ngawo-1980, bobabili i-GE Company (USA) kanye ne-Sumitomo Company (eJapane) bafunde ukukhishwa kwe-cobalt endaweni yokusebenza yamazinyo e-PDC ukuze kuthuthukiswe ukusebenza kwamazinyo. Kodwa abazange bazuze impumelelo kwezohwebo. Ubuchwepheshe baphinde bathuthukiswa futhi bagunyazwa yi-Hycalog（USA）. Kwafakazelwa ukuthi uma impahla yensimbi ingasuswa esikhaleni sokusanhlamvu, ukuzinza okushisayo kwamazinyo e-PDC kuzothuthukiswa kakhulu ukuze i-bit ikwazi ukubhoboza kangcono ekubunjweni okuqinile nokulimazayo. Lobu buchwepheshe bokukhipha i-cobalt buthuthukisa ukumelana nokugqokwa kwamazinyo e-PDC ekwakhekeni kwamatshe aqinile abrasive kakhulu futhi kwandise ububanzi bokusetshenziswa kwamabhithi e-PDC.