PDC (Polycrystalline Pob Zeb Diamond Composite) cov cuab yeej, nrog lawv cov hardness siab ntawm txheej pob zeb diamond txheej thiab qhov zoo toughness ntawm lub hauv paus cemented carbide txheej, ua kom pom qhov zoo ntawm cov roj drilling, geological tshawb nrhiav, thiab machining ntawm cov khoom hnav heev - cov ntaub ntawv resistant. Txawm li cas los xij, kev paub txog cov txiaj ntsig kev ua tau zoo no yog nyob ntawm kev xaiv kev tshawb fawb txog kev tshawb fawb - tsuas yog los ntawm kev sib koom ua ke ntawm cov yam ntxwv ua haujlwm, cov khoom siv tsis zoo, thiab cov hom phiaj ntawm daim ntawv thov tuaj yeem ua tau zoo, ruaj khov, thiab kev siv nyiaj txiag ua tiav.
Lub hauv paus tseem ceeb rau kev xaiv PDC cov cuab yeej yog kev tshuaj xyuas meej ntawm cov yam ntxwv ua haujlwm. Cov txheej txheem tseem ceeb rau kev txiav cov cuab yeej sib txawv ntawm qhov sib txawv ntawm daim ntawv thov: Hauv cov roj drilling, cov ntsiab lus tseem ceeb suav nrog cov pob zeb hardness (piv txwv li, nruab nrab-cov yam ntxwv mos ntawm sandstone thiab limestone piv rau nruab nrab- cov yam ntxwv nyuaj ntawm granite), abrasiveness (siab dua quartz cov ntsiab lus ua rau muaj zog abrasiveness ntau dua), thiab drillability siab, thiab drillability indexing down, thiab drillability siab. cuam tshuam cuam tshuam los ntawm gravel txheej); nyob rau hauv geological kev tshawb nrhiav coring kev khiav hauj lwm, ntxiv rau tsim tej yam kev mob, kev ncaj ncees ntawm cov tub ntxhais qauv thiab kev tswj ntawm cov tub ntxhais kev cuam tshuam los ntawm cov hniav txiav yuav tsum tau txiav txim siab; nyob rau hauv machining siab- hnav- cov ntaub ntawv resistant (xws li, siab- silicon aluminium alloys thiab carbon fiber composites), lub hom phiaj yuav tsum yog ntawm cov khoom siv thermal conductivity, ua hauj lwm hardening nyiam, thiab thermomechanical load nyob rau hauv tej cheeb tsam. Tsim kom muaj tus qauv ua haujlwm raws li cov ntaub ntawv geological, cov ntaub ntawv keeb kwm kev ua haujlwm, lossis kev sim machining yog lub hauv paus rau kev xaiv cov cuab yeej tom ntej.
Kev sib piv cov cuab yeej cov qauv tsis yog ib kauj ruam tseem ceeb hauv kev xaiv. Cov pob zeb diamond loj ntawm cov pob zeb diamond txheej saum npoo av yuav tsum tau hloov kho raws li qhov sib txawv ntawm qhov tsim: zoo - pob zeb diamond txheej (piv txwv li, 1-5μm) yog tsim rau cov txheej txheem abrasive heev los yog machining scenarios nquag ua cov cuab yeej nplaum vim lawv cov kab lis kev cai tuab thiab zoo heev hnav tsis kam; ntxhib- pob zeb diamond txheej (piv txwv li, 10-25μm) yog qhov tsim nyog rau kev ua hauj lwm uas muaj cov khoom nyuaj los yog cuam tshuam tsis sib xws vim lawv qhov loj intergranular bonding cheeb tsam thiab muaj zog tiv taus. Hom kev sib txuas ncaj qha cuam tshuam rau thermal stability: cov pa hlau sib txuas cov theem (xws li cobalt{14}}raws li) yog tus nqi qis tab sis yooj yim catalyze graphitization ntawm qhov kub thiab txias, ua rau lawv haum rau qis- kub, qis-load scenarios; qis-catalysis lossis tsis yog{21}}hlau sib txuas theem (piv txwv li, silicides, carbides), txawm tias kim dua, tuaj yeem nce qhov kub ntawm thermal decomposition mus rau ntau tshaj 700 degree, ua rau lawv qhov tseem ceeb rau kev sib sib zog nqus zoo siab - kub drilling lossis high-speed machining. Cov ntsiab lus cobalt ntawm lub hauv paus cemented carbide matrix yuav tsum sib npaug toughness thiab hardness: siab cobalt cov ntsiab lus (piv txwv li, 15% -20%) ua rau zoo heev matrix toughness, muaj peev xwm tiv taus muaj zog cuam tshuam; cov ntsiab lus qis cobalt (piv txwv li, 6% -10%) ua rau siab matrix hardness, haum rau hnav tsis kam nyob rau hauv cov khoom ruaj khov. Tsis tas li ntawd, cov hniav zoo nkauj ntawm cov hniav txiav (piv txwv li, tiaj tus sab saum toj, puag ncig sab saum toj), rake lub kaum sab xis, thiab kev tshem tawm lub kaum sab xis tsim cuam tshuam rau kev txiav thiab nti tshem tawm kev ua haujlwm, yuav tsum tau ua kom zoo raws li pob zeb tawg lossis txiav cov txheej txheem.
Cov txheej txheem tsim khoom thiab kev ruaj ntseg zoo yog qhov cuam tshuam tab sis tseem ceeb heev. High-PDC cov cuab yeej zoo yuav tsum tau ua kom nruj- kub, siab-siab (HPHT) sintering txheej txheem los xyuas kom meej lub metallurgical bonding zog ntawm lub pob zeb diamond txheej thiab cov matrix, tsis txhob muaj kev pheej hmoo ntawm interlayer delamination; lub purity (Ntau tshaj los yog sib npaug rau 99.9%) thiab particle loj faib uniformity (span Tsawg dua los yog sib npaug rau 2μm) ntawm cov pob zeb diamond hmoov ncaj qha cuam tshuam rau cov cuab yeej hnav tsis sib xws; lub uniformity ntawm lub tsev cog khoom theem faib (tsis muaj lub zos enrichment los yog deficiency) txiav txim qhov kev cia siab ntawm thermal stability thiab cuam tshuam rau qaug zog. Xaiv ib tus neeg muag khoom nrog cov kev tshuaj ntsuam xyuas zoo (xws li kev kuaj ultrasonic, kev tshuaj ntsuam xyuas metallographic, thiab ntsuas ntsuas kub) tuaj yeem txo qhov kev pheej hmoo ntawm kev ua tsis tiav thaum ntxov vim kev tsim khoom tsis zoo los ntawm qhov pib.
Kev lag luam thiab tag nrho cov nqi ntawm lub neej yuav tsum tau suav nrog hauv kev ntsuam xyuas dav. Txawm hais tias siab -PDC cov cuab yeej ua tau zoo muaj tus nqi pib yuav ntau dua, lawv lub neej ntev (3-5 zaug ntev dua li cov cuab yeej siv) thiab kev ua haujlwm siab (30% -50% siab dua cov tshuab drilling ceev) tuaj yeem txo tus nqi tag nrho ntawm ib chav tsev ntawm footage lossis ib chav ntawm machining. Nws yog ib qho tseem ceeb kom tsis txhob muaj kev txi ntawm qhov tseem ceeb ntawm kev ua tau zoo rau lub hom phiaj ntawm tus nqi qis; Kev suav tag nrho lub neej ntawm "tus nqi pib + hloov zaus + kev poob qis" yuav tsum tau ua los xaiv cov kev daws teeb meem zoo tshaj plaws.
Hauv cov ntsiab lus, xaiv PDC cov cuab yeej yog ib txoj haujlwm sib koom ua ke ntawm kev ua haujlwm ntawm kev txheeb xyuas, kev sib piv, kev txheeb xyuas cov txheej txheem, thiab kev ntsuam xyuas nyiaj txiag. Tsuas yog los ntawm kev ua cov ntaub ntawv -tsav thiab xav tau- taw qhia tuaj yeem txheeb xyuas cov cuab yeej tsim nyog tshaj plaws hauv kev ua haujlwm nyuaj, muab kev lav zoo rau kev ua haujlwm tau zoo thiab kev tswj hwm tus nqi.
