PCD cov khoom sib tsoo cov yam ntxwv

PCD yog tsim los ntawm sintering tshwj xeeb kho pob zeb diamond thiab ib qho me me ntawm binder nyob rau hauv qhov kub thiab txias. Cov pob zeb diamond uas tsis sib haum xeeb muab PCD ib qho zoo, tsis tshua muaj siab hardness thiab hnav tsis kam. PCD tuaj yeem siv rau kev txiav cov cuab yeej, sib tsoo log hnav, geological drilling, ntsuas cov cuab yeej sojntsuam, cov cuab yeej kos duab, cov cuab yeej sandblasting, thiab lwm yam. Txawm li cas los xij, lub siab hardness thiab siab hnav tsis kam ntawm PCD kuj coj teeb meem loj rau nws cov txheej txheem.

Cov kws tshawb fawb hauv tsev thiab txawv teb chaws tau ua ntau yam kev tshawb fawb thiab kev sim ntawm kev ua cov teeb meem tshwm sim los ntawm lub siab hardness thiab siab hnav tsis kam ntawm PCD cov ntaub ntawv, xws li hluav taws xob tawm machining, ultrasonic machining, electrochemical machining, laser machining, thiab lwm yam., thiab tau tiav. tej yam tshwm sim. Txawm li cas los xij, kev tsom xam pom tau hais tias cov txheej txheem kev ua haujlwm tam sim no feem ntau haum rau kev ua haujlwm nyuaj ntawm PCD cov ntaub ntawv. Txhawm rau kom tau txais PCD txiav ntug zoo, txoj kev ua haujlwm zoo tshaj plaws yog tseem sib tsoo lossis lapping nrog pob zeb diamond log.

Cov txheej txheem sib tsoo ntawm PCD feem ntau yog tshwm sim los ntawm kev sib xyaw ua haujlwm ntawm cov tshuab thiab cov thermochemical. Lub tshuab ua haujlwm yog qhov micro-breaking, abrasion, shedding lossis cleavage ntawm pob zeb diamond tsim los ntawm kev cuam tshuam tas mus li ntawm pob zeb diamond log abrasive hais rau PCD cov khoom; cov thermochemical kev txiav txim yog qhov kub siab tsim los ntawm lub pob zeb diamond log sib tsoo PCD kom oxidize lossis graphitize lub pob zeb diamond. Raws li kev sib xyaw ua haujlwm ntawm ob, PCD cov khoom raug tshem tawm.

Cov yam ntxwv ntawm nws txoj kev sib tsoo yog:

(1) Lub zog sib tsoo zoo heev

Pob zeb diamond yog cov khoom hnyav tshaj plaws ntawm cov pob zeb uas paub txog, thiab qhov hnav ntawm kev sib txhuam nrog ntau yam hlau thiab cov khoom tsis yog hlau tsuas yog 1/50 - 1/800 ntawm cemented carbide; PCD hardness (HV) yog 80 - 120KN / mm2, thib ob tsuas yog siv lead ua pob zeb diamond, ntau dua li cemented carbide. Thaum lub pob zeb diamond sib tsoo log yog siv los zom PCD, qhov pib txiav lub zog yog siab heev, uas yog li ntawm 10 npaug ntau dua li cov cemented carbide (0.4MPa); qhov kev sib tsoo tshwj xeeb tuaj yeem ncav cuag 1.2 × 104 - 1.4 × 105J / mm3; Yog li ntawd, kev sib tsoo quab yuam ntau dua Siv rau kev sib tsoo cemented carbide.

(2) Qhov sib tsoo yog me me

Vim lub siab tawv thiab hnav tsis kam ntawm PCD (cov txheeb ze hnav tsis kam yog 16 txog 199 npaug ntawm cov cemented carbide), qhov sib tsoo piv thaum sib tsoo PCD tsuas yog 0.005 rau 0.033, uas yog hais txog 1/1000 rau cemented carbide. 1/100000; kev sib tsoo efficiency tsuas yog 0.4 - 4.8mm3 / min. Yog li ntawd, txhawm rau txhawm rau txhawm rau txhawm rau txiav ntug zoo thiab tshem tawm tus nqi ntawm cov cuab yeej txiav, lub sij hawm sib tsoo yog ntev thiab kev ua haujlwm tsawg. Tsis tas li ntawd, thaum lub hardness, cov ntsiab lus thiab particle loj ntawm PCD sib txawv, lub sij hawm sib tsoo kuj sib txawv heev.

(3) Granularity muaj txiaj ntsig zoo

Cov ntaub ntawv PCD yog siv los txiav cov cuab yeej raws li qhov loj me. Lawv feem ntau muab faib ua peb pawg: coarse particle loj (20-50 μm), nruab nrab particle loj (li 10 μm) thiab nplua particle loj (~ 5 μm). Kev sib tsoo quab yuam thiab kev sib tsoo yog ob peb zaug rau kaum sib txawv. Sijhawm. Coarse-grained PCD muaj qhov sib tsoo siab tshaj plaws, thiab kev sib tsoo kuj yog qhov nyuaj tshaj plaws. Tom qab kev sib tsoo, qhov txiav ntug yog qhov hnyav tshaj plaws thiab qhov zoo tshaj plaws yog qhov phem tshaj, tab sis qhov hnav tsis kam yog qhov muaj zog tshaj plaws; Qhov zoo-grained PCD sib tsoo piv yog qhov qis tshaj, thiab kev sib tsoo yooj yim dua. Kev txiav ntug zoo tom qab sib tsoo