I-Thermally Stable Polycrystalline Diamond Bit Cutter

Abasiki bebhithi bedayimane be-polycrystalline abazinzile ngokwezinga lokushisa baqalwa lapho kutholakala ukuthi ama-bit cutter e-PDC kwesinye isikhathi ayeqoshwa ngesikhathi sokumba. Lokhu kwehluleka kube ngenxa yokucindezeleka kwangaphakathi okubangelwa ukunwetshwa okuhlukile kwedayimane nokuhlanganisa.

I-Cobalt iyi-binder esetshenziswa kakhulu emikhiqizweni ye-PCD ehlanganisiwe. Le nto ine-coefficient eshisayo yokunwetshwa okungu-1.2 x 10 ^-5 deg. C uma kuqhathaniswa no-2.7 x 10 ^-6 wedayimane. Ngakho-ke i-cobalt ikhula ngokushesha kunedayimane. Njengoba izinga lokushisa eliningi lomsiki likhuphuka ngaphezu kuka-730 deg C ukucindezeleka kwangaphakathi okubangelwa amazinga ahlukene okwandisa kuholela ekuqhekekeni okukhulu kwe-intergranular, ukusika ama-macro, kanye nokwehluleka okusheshayo komsiki.

Lawa mazinga okushisa aphezulu kakhulu kunamazinga okushisa atholakala ngaphansi kwe-borehole (imvamisa engu-100 deg C ku-8000 ft). Zivela ngenxa yokungqubuzana okukhiqizwa isenzo sokugunda lapho lezi zicucu zisika idwala.

Lesi sithiyo sezinga lokushisa esingu-730 deg C sethule imigoqo engathi sína ekusebenzeni okuthuthukisiwe kwamabhithi okusika i-PCD.

Abakhiqizi bazame ukuthuthukisa ukuzinza okushisayo kwabasiki kanye nezisiki zebhithi zedayimane ezizinzile ze-polycrystalline zedayimane zathuthukiswa.

Lezi zicucu ze-bits zizinzile emazingeni okushisa aphakeme ngoba i-cobalt binder isusiwe futhi lokhu kuqeda ukucindezeleka kwangaphakathi okubangelwa ukwandiswa okuhlukile. Njengoba iningi le-binder lixhumene, ukwelashwa okunwetshiwe ngama-asidi kungakhipha iningi lazo. Izibopho phakathi kwezinhlayiya zedayimane eziseduze azithinteki, zigcina u-50-80% wamandla ama-compact. I-PCD evundile izinzile ngokushisa okushisayo endaweni engasebenzi noma enciphisa umoya ibe ngu-1200 deg C kodwa izokwehlisa izinga ku-875 deg C lapho kukhona umoya-mpilo.

Kwafakazelwa ukuthi uma impahla ye-cobalt ingasuswa esikhaleni sokusanhlamvu, ukuzinza okushisayo kwamazinyo e-PDC kuzothuthukiswa kakhulu ukuze i-bit ikwazi ukubhoboza kangcono ekubunjweni okuqinile nokunamandla. Lobu buchwepheshe bokususa i-cobalt buthuthukisa ukumelana nokugqokwa kwamazinyo e-PDC ekwakhekeni kwamatshe aqinile abrasive kakhulu futhi kunwebise kakhulu uhla lokusetshenziswa kwamabhithi e-PDC.

Ukuze uthole ulwazi olwengeziwe mayelana nabasiki be-PDC, wamukelekile ukusivakashela ku-www.zzbetter.com