PDC cov cuab yeej (Polycrystalline Pob Zeb Diamond Composite Cov Cuab Yeej) yog cov cuab yeej tseem ceeb hauv niaj hnub drilling thiab siab - hnav- resistant machining teb. Lawv cov yam ntxwv thev naus laus zis yog los ntawm kev sib sib zog nqus ntawm cov qauv tsim tshwj xeeb thiab cov txheej txheem tsim khoom siab heev. Nrog ib tug tub ntxhais ob - txheej architecture uas muaj ib tug nto polycrystalline pob zeb diamond txheej thiab ib tug hauv qab cemented carbide matrix, PDC cov cuab yeej tuav lub siab heev hardness ntawm pob zeb diamond thaum compensating rau nws brittleness, tsim ib tug zoo sib xws uas combines hnav tsis kam, cuam tshuam tsis kam, thiab zoo clamping kev ua tau zoo, muab kev txhawb txhim khu kev qha rau cov hauj lwm zoo nyob rau hauv complex tej yam kev mob.
Lub hom phiaj tseem ceeb tshaj plaws yog ultra- nyuaj thiab hnav- cov txheej txheem txiav. Cov txheej txheej pob zeb diamond polycrystalline yog tsim los ntawm siab - kub thiab siab - siab sintering ntawm micron - pob zeb diamond hais. Lub pob zeb diamond tsim ib qhov ntom ntom peb- qhov sib txuas sib txuas nrog cov ntawv cog lus muaj zog, ua tiav qhov hardness ze rau ntawm pob zeb diamond ntuj thiab deb tshaj li cov pa cemented carbide thiab cov ntaub ntawv ceramic. Cov yam ntxwv no ua rau PDC cov cuab yeej txo qis cov cuab yeej hnav thaum lub sij hawm tshem tawm cov khoom thaum ua hauj lwm nrog siab -cov pob zeb hardness (xws li granite thiab basalt) los yog hnav heev-cov khoom ua haujlwm tiv taus (xws li siab- silicon aluminium alloys thiab carbon fiber ntau), txuas ntxiv lub neej kev pabcuam ntawm ib lub sijhawm ua haujlwm thiab txo cov cuab yeej faux.
Thib ob, muaj cov qauv tsim qauv sib xyaw ua ke uas sib xyaw ua ke rigidity thiab yooj. Hauv qab cemented carbide matrix (feem ntau yog tungsten-cobalt alloy) muaj kev cuam tshuam zoo heev thiab lub zog ntawm lub zog, nqus tau zoo thiab cuam tshuam qhov cuam tshuam ntawm cov khoom tsim tawm thaum txiav, tiv thaiv cov pob zeb diamond txheej los ntawm kev tawg los yog tev tawm vim yog brittleness ntau dhau. Qhov kev faib ua haujlwm no, qhov uas cov pob zeb diamond txheej yog lub luag haujlwm rau hnav- tiv thaiv kev txiav thiab cov cemented carbide txheej yog lub luag haujlwm rau kev thauj khoom- kev txhawb nqa, tso cai rau PDC cov cuab yeej kom muaj kev ruaj ntseg hauv kev txiav tsis tu ncua thiab tseem tuav cov txheej txheem kev ncaj ncees raws li qhov cuam tshuam tsis sib xws (xws li gravel txheej hauv drilling los yog cov ntsiab lus nyuaj hauv machining), nthuav lawv cov ntawv thov ntau yam.
Thib peb, muaj siab -kub stability thiab qis- tus yam ntxwv kev sib txhuam. Covalent daim ntawv cog lus ntawm pob zeb diamond tswj kev sib raug zoo txawm tias qhov kub thiab txias, tso cai rau cov cuab yeej siv PDC ua haujlwm tsis tu ncua saum 300℃yam tsis muaj qhov muag muag. Los ntawm kev ua kom zoo ntawm cov txheej txheem kev sib txuas (xws li, txo cov catalytic hlau residue thiab qhia cov theem ceramic los yog carbide), thermally ruaj khov PDC variants tuaj yeem tiv taus qhov kub siab tshaj 700 degree, yoog mus rau qhov kub siab tam sim no - kub ib puag ncig ntawm siab - ceev txiav lossis tob tob drilling. Tib lub sijhawm, qhov sib txhuam qis ntawm cov pob zeb diamond nto txo qhov adhesion thiab ua tau - nce ntug tsim thaum txiav, txhim kho nto tiav thiab txo kev siv zog.
Tsis tas li ntawd, kev tswj xyuas meej meej ntawm cov txheej txheem tsim khoom yog qhov kev txhawb nqa tseem ceeb rau cov thev naus laus zis no. Siab - kub, siab - siab sintering tso cai rau kev tswj cov pob zeb diamond particle loj tis thiab grain ciam ciam teb lub zog, kom ntseeg tau qhov ceev thiab uniformity ntawm txiav txheej. Optimized tsim ntawm kev sib raug zoo theem muaj pes tsawg leeg (xws li, siv silicides los yog borides es tsis txhob ntawm tsoos hlau catalysts) zoo suppresses theem transformation ntawm pob zeb diamond rau graphite, txhim kho thermal stability thiab oxidation kuj. Customized hniav geometry tsim (xws li, rake lub kaum sab xis, clearance lub kaum sab xis, thiab yas profile) ntxiv optimizes lub txiav trajectory thiab nti tshem tawm efficiency, txo torque fluctuations thiab cov kev pheej hmoo ntawm theem nrab hnav. Hauv cov ntsiab lus, cov yam ntxwv ntawm PDC cov cuab yeej txiav tau tshwm sim hauv lawv cov ultra- nyuaj thiab hnav- cov txheej txheem txiav, cov qauv sib xyaw ua ke uas sib xyaw ua ke thiab ua kom yooj yim, zoo heev - qhov kub thiab txias thiab tsis tshua muaj kev sib txhuam, thiab cov txheej txheem tsim khoom raug tswj tau. Cov yam ntxwv no ua rau lawv nthuav tawm cov txiaj ntsig tseem ceeb thiab kev ntseeg siab hauv cov roj drilling, kev tshawb nrhiav geological, thiab siab - hnav- tiv taus machining teb, ua rau lawv yog cov cuab yeej tseem ceeb rau kev ua txhaum kev ua haujlwm ntawm cov cuab yeej ib txwm muaj.
