Hauv thaj teb ntawmsiab -kev ua tau zooPDC Cutter manufacturing, "leaching" yog cov txheej txheem tshuaj tseem ceeb hauv kev tshaj tawm - theem ua tiav, nrog rau cov tub ntxhais yog cov kev taw qhia tshem tawm cov residual cobalt hlau nyob rau hauv polycrystalline pob zeb diamond txheej los txhim khothermal stability.
ThaumHPHTPDC sintering, cobalt ua raws li ib tug catalyst los txhawb cov tsim ntawm ruaj khov covalent bonds ntawm pob zeb diamond hais. Txawm li cas los xij, txawm hais tias cov cobalt residual nyob rau hauv cov hniav tiav tuaj yeem txhim kho tag nrho cov tawv nqaij, muaj qhov tsis txaus ntseeg ntawmthermal degradation. Lub thermal expansion coefficients ntawm cobalt thiab pob zeb diamond txawv ze li ntawm 10 npaug. Thaum qhov kub ntawm hauv av drilling tshaj 700 degree, qhov sib txawv deformation ntawm ob yuav ua rau muaj kev ntxhov siab nyob rau hauv, ua rau lub cev qhuav dej thiab detachment ntawm pob zeb diamond txheej, ua rau lub neej luv luv.xyaum ntsis txiav cov hniav. Cov txheej txheem leaching siv cov kua qaub etching reagents los xaiv yaj cov ntsiab lus cobalt nyob rau saum npoo ntawm pob zeb diamond, txo qhov kev pheej hmoo ntawm siab - kub deformation mismatch los ntawm lub hauv paus.
CovPDC leaching txheej txheemmuab faib ua peb theem: ntiav (20-50 $\\mu$m), nruab nrab (50-100 $\\mu$m), thiab tob (siab tshaj 100 $\\mu$m), uas yog haum rau txawvpob zeb tsimtej yam kev mob. Plab leaching hniav xav txog ob qho tib si cuam tshuam thiab kub tsis kam, haum rau drilling hauv nruab nrab nyuaj sandstone thiab limestone formations; Lub thermal stability ntawmsib sib zog nqus leached PDC cutterstau raug txhim kho los ntawm ntau tshaj 40%, ua rau nws haum rau siab - kub kub ua haujlwm xws lisiab abrasive nyuaj formationsthiabshale gas kab rov tav qhov dej.
