Qhov kev ua tau zoo ntawm thermally ruaj khov polycrystalline pob zeb diamond (PCD) qia los ntawm nws cov txheej txheem tsim thiab kev npaj zoo. Nws tsis yog tsuas yog ib qho teeb meem ntawm stacking pob zeb diamond hmoov, tab sis yog ib qho kev sib xyaw ua ke ntawm cov khoom siv raw khoom zoo, kev ua kom zoo dua qub, thiab kev tshaj tawm tshwj xeeb - kev kho kom tsim tau cov khoom siv zoo tshaj plaws uas ua kom muaj kev ruaj ntseg ntawm cov pob zeb diamond theem thiab cov qauv kev ntseeg siab ntawm qhov kub thiab txias. Kev nkag siab txog nws txoj kev sib xyaw ua ke pab kom nkag siab qhov tseem ceeb ntawm kev tsim cov khoom siv thiab muab lub hauv paus theoretical rau kev xaiv daim ntawv thov.
Ntawm cov khoom siv raw, thermally ruaj khov PCD siv siab -purity ib leeg- siv lead ua pob zeb diamond micron hmoov ua nws cov ntsiab lus tseem ceeb. Qhov loj me me feem ntau yog tswj hwm hauv micrometer mus rau submicrometer ntau yam, thiab cov khoom sib txawv me me yog tau los ntawm kev sib tw nruj. A more uniform particle size helps to form a dense and continuous grain boundary network, reducing local weak points caused by significant differences in particle size. Daim ntawv siv lead ua ntawm cov khoom siv raw kuj yuav tsum tau ua kom zoo; ib daim ntawv ua tiav siv lead ua tuaj yeem ua rau thaj chaw sib cuag thiab sib txuas lub zog ntawm cov khoom, tso lub hauv paus zoo rau kev sintering tom ntej.
Qhov muaj pes tsawg leeg ntawm cov txheej txheem khi yog qhov tseem ceeb hauv kev txiav txim siab thermal stability. Cov pa PCD (polycrystalline pob zeb diamond) feem ntau siv cov hlau hloov pauv xws li cobalt thiab npib tsib xee ua catalysts thiab binders. Cov hlau no ua rau kev hloov pauv ntawm pob zeb diamond mus rau graphite ntawm qhov kub thiab txias, txwv kev ua haujlwm kub. Thermally ruaj khov PCD suav nrog kev hloov pauv tseem ceeb rau nws cov muaj pes tsawg leeg: txo cov ntsiab lus ntawm cov hlau catalytic thiab qhia cov ceramic los yog carbide-raws li tsis yog-hlau khi theem, xws li silicides, borides, los yog nitrides. Cov txheej txheem khi no tsis koom nrog cov tshuaj tiv thaiv catalytic graphitization thiab tswj cov tshuaj lom neeg thiab kev ruaj ntseg ntawm qhov kub thiab txias, yog li ua kom cov khoom thermal decomposition kub.
Cov txheej txheem sintering yog cov kauj ruam tseem ceeb hauv kev tsim cov qauv sib xyaw ua ke ntawm cov pob zeb diamond thiab cov txheej txheem khi. Siab -kub, siab -siab (HPHT) tej yam kev mob tso cai rau pob zeb diamond microparticles mus rau cov yas ntws thiab interlocking nyob rau hauv cov kev taw qhia ntawm lub binding theem, tsim ib tug peb -sib tshooj network. Cov txheej txheem no yuav tsum muaj kev tswj xyuas qhov kub thiab txias, siab, thiab lub sijhawm kom muaj kev sib koom ua ke txaus txaus thaum tsis txhob muaj cov cua kub ntau dhau uas tuaj yeem ua rau ua ntej -graphitization.
Tom qab- kev kho mob yog ib qho tseem ceeb ntxiv cov kauj ruam nyob rau hauv imparting thermal stability. Cov txheej txheem muaj xws li siab -lub tshuab nqus tsev kub los yog kev tiv thaiv huab cua annealing, uas txhawb nqa qhov sib txawv, sib sau ua ke, lossis ua kom tsis muaj zog ntawm cov khoom siv catalytic, txo lawv cov kev ua haujlwm catalytic ntawm cov ciam teb nplej. Qee cov txheej txheem kuj suav nrog oxidation nto lossis txheej txheej kom ntxiv dag zog oxidation thiab corrosion kuj. Cov ntawv tshaj tawm no - kev kho mob tsis hnov mob hnyav nrog lub pob zeb diamond matrix tab sis txhim kho cov khoom ruaj khov hauv kev sib hloov cov khoom kub.
Hauv cov ntsiab lus, cov txheej txheem sib xyaw ua ke rau thermally ruaj khov PCD integrates kev xaiv ntawm siab - zoo pob zeb diamond hmoov, tsim ntawm qis -catalysis los yog tsis yog -hlau binding theem, meej HPHT sintering tswj, thiab lub hom phiaj ncej- cov txheej txheem kho. Qhov no multi-theem synergistic nyhuv tso cai rau nws khaws cov ultra- cov khoom nyuaj ntawm pob zeb diamond thaum nthuav tawm cov qauv zoo thiab kev ua tau zoo tuav lub peev xwm nyob rau hauv siab - qhov kub thiab txias, muab cov khoom siv txhim khu kev qha rau kev ua haujlwm nyob rau hauv huab cua txias.
