Thermally Stable Polycrystalline Diamond Bit Cutter

Odulira pang'ono a diamondi okhazikika a polycrystalline adayambitsidwa pomwe zidapezeka kuti PDC bit cutters nthawi zina amadulidwa pobowola. Kulephera kumeneku kudachitika chifukwa cha kupsinjika kwamkati komwe kumachitika chifukwa cha kukulirakulira kwa diamondi ndi zinthu zomangira.

Cobalt ndiye binder yomwe imagwiritsidwa ntchito kwambiri pazinthu za PCD za sintered. Nkhaniyi ili ndi choyezera chotenthetsera cha kukula kwa 1.2 x 10 ^-5 deg. C poyerekeza ndi 2.7 x 10 ^-6 pa diamondi. Chifukwa chake cobalt imakula mwachangu kuposa diamondi. Pamene kutentha kwakukulu kwa wodula kumakwera pamwamba pa 730 deg C kupsyinjika kwamkati komwe kumachitika chifukwa cha kufalikira kosiyanasiyana kumabweretsa kuphulika kwakukulu kwa intergranular, macro chips, ndi kulephera kofulumira kwa wodulayo.

Kutentha kumeneku kumakhala kokwera kwambiri kuposa kutentha komwe kungapezeke pansi pa borehole (nthawi zambiri 100 deg C pa 8000 ft). Amachokera ku kukangana komwe kumabwera chifukwa cha kumeta ubweya komwe timadulira timadula mwala.

Chotchinga cha kutentha ichi cha 730 deg C chinapereka zopinga zazikulu pakuwongolera magwiridwe antchito a PCD cutter bits.

Opanga adayesa kukonza kukhazikika kwamafuta kwa odulawo ndipo odula ma diamondi okhazikika a polycrystalline adapangidwa.

Odula ma bits awa amakhala okhazikika pakutentha kwambiri chifukwa chomangira cha cobalt chachotsedwa ndipo izi zimachotsa kupsinjika kwamkati komwe kumachitika chifukwa chakukula kosiyana. Popeza zambiri zomangira zimalumikizidwa, chithandizo chotalikirapo ndi ma acid amatha kutulutsa zambiri. Zomangira zomwe zili pakati pa tinthu tating'ono ta diamondi sizimakhudzidwa, zomwe zimasunga 50-80% ya mphamvu za compacts. PCD yolemedwa imakhala yokhazikika pa kutentha kwa inert kapena kuchepetsa mpweya ku 1200 deg C koma idzawonongeka pa 875 deg C pamaso pa mpweya.

Zinatsimikiziridwa kuti ngati zinthu za cobalt zitha kuchotsedwa mumpata wambewu, kukhazikika kwamafuta kwa mano a PDC kudzakhala bwino kwambiri kotero kuti pang'onopang'ono amatha kubowola bwino pamapangidwe olimba komanso owopsa. Ukadaulo wochotsa cobalt umathandizira kukana kwa mano a PDC m'miyala yolimba kwambiri komanso kumakulitsa kuchuluka kwa ma PDC bits.

Kuti mumve zambiri za odula a PDC, mwalandiridwa kuti mutichezere pa www.zzbetter.com