Thermally Stable Polycrystalline Pob Zeb Diamond Bit Cutter

Thermally ruaj khov polycrystalline pob zeb diamond me ntsis cutters tau qhia thaum nws pom tias PDC me ntsis cutters tau qee zaum chipped thaum lub sij hawm drilling. Qhov kev ua tsis tiav no yog vim muaj kev ntxhov siab sab hauv los ntawm qhov sib txawv ntawm qhov nthuav dav ntawm pob zeb diamond thiab cov khoom siv khi.

Cobalt yog cov khoom siv dav tshaj plaws hauv sintered PCD khoom. Cov khoom no muaj thermal coefficient ntawm expansion ntawm 1.2 x 10 ^-5 deg. C piv rau 2.7 x 10 ^-6 rau pob zeb diamond. Yog li ntawd, cobalt expands sai dua pob zeb diamond. Raws li qhov kub ntawm cov cutter nce siab tshaj 730 ° C sab hauv kev ntxhov siab tshwm sim los ntawm qhov sib txawv ntawm kev nthuav dav ua rau muaj kev sib tshuam loj heev, macro chipping, thiab tsis ua haujlwm sai ntawm lub tshuab txiav.

Cov kub no ntau dua li qhov kub thiab txias kom pom nyob rau hauv qab ntawm lub borehole (feem ntau 100 deg C ntawm 8000 ft). Lawv tshwm sim los ntawm kev sib txhuam tsim los ntawm kev txiav txiav uas cov khoom no txiav lub pob zeb.

Qhov ntsuas kub ntawm 730 deg C nthuav qhia qhov teeb meem loj rau kev txhim kho kev ua haujlwm ntawm PCD cutter khoom.

Cov neeg tsim khoom tau sim nrog kev txhim kho thermal stability ntawm cov cutters thiab thermally ruaj khov polycrystalline pob zeb diamond khoom cutters tau tsim.

Cov khoom cutters no ruaj khov dua ntawm qhov kub siab dua vim tias cov cobalt khi tau raug tshem tawm thiab qhov no tshem tawm cov kev ntxhov siab sab hauv los ntawm kev nthuav dav sib txawv. Txij li feem ntau ntawm cov binder muaj kev sib tshuam, kev kho mob txuas ntxiv nrog cov kua qaub tuaj yeem tshem tawm feem ntau ntawm nws. Cov ntawv cog lus ntawm cov pob zeb diamond uas nyob ib sab tsis cuam tshuam, khaws 50-80% ntawm lub zog compacts. Leached PCD yog thermally ruaj khov nyob rau hauv ib qho inert los yog txo cov cua mus rau 1200 deg C tab sis yuav degrade ntawm 875 deg C nyob rau hauv muaj oxygen.

Nws tau raug pov thawj tias yog tias cov khoom siv cobalt tuaj yeem raug tshem tawm ntawm qhov sib txawv ntawm cov nplej, qhov thermal stability ntawm PDC cov hniav yuav zoo dua kom cov me ntsis tuaj yeem xyaum zoo dua hauv cov txheej txheem nyuaj thiab ntau dua. Lub tshuab tshem tawm cobalt no txhim kho qhov hnav tsis kam ntawm PDC cov hniav hauv cov pob zeb tawv tawv heev thiab ua kom dav ntxiv rau cov ntawv thov ntawm PDC cov khoom.

Yog xav paub ntxiv txog PDC cutters, txais tos tuaj xyuas peb ntawm www.zzbetter.com