PCD cov cuab yeej yog ua los ntawm polycrystalline pob zeb diamond riam taub thiab carbide matrix los ntawm kev kub siab thiab siab sintering. Nws tsis tuaj yeem tsuas yog muab tag nrho kev ua si rau qhov zoo ntawm kev tawv tawv, muaj kev sib txhuam me me, tab sis kuj tau txais mus rau hauv tus account lub zog ntawm nyuaj alloy.
Thermal stability, tej yam nyuaj thiab hnav tsis kam yog qhov ntsuas pom tau tseem ceeb ntawm PCD. Vim tias nws feem ntau yog siv hauv qhov kub thiab txias thiab muaj kev ntxhov siab ntau, thermal stability yog qhov tseem ceeb tshaj plaws. Qhov kev tshawb fawb no qhia tau hais tias kev siv hluav taws xob thermal ntawm PCD muaj qhov cuam tshuam zoo ntawm nws cov kev coj tsis kam thiab cuam tshuam nyuaj. Cov ntaub ntawv qhia tau tias thaum qhov ntsuas kub siab dua 750 ℃, cov coj tawv ntawm PCD feem ntau poob los ntawm 5% -10%.
Lub Xeev Crystal ntawm PCD txiav txim siab nws cov khoom. Hauv microstructure, carbon atoms daim ntawv cog lus nrog plaub lub cev atoment, thiab tom qab ntawd muaj cov kev taw qhia ua kom muaj zog thiab txoj kev tawv tawv muaj zog, thiab tawv tawv. Cov kev ua tau zoo tshaj plaws ntawm PCD yog raws li hauv qab no: ① Lub Hardness tuaj yeem ncav cuag 8000 hv, 8-12 zaug ntawm carbide; ② Thermal conductivity yog 700W / MK, 1.5-9 zaug, txawm siab tshaj li PCBN thiab tooj liab; ③ Kev sib txhuam ua ke coefficient feem ntau tsuas yog 0.1-0.3, ntau tsawg dua 0.4-1 ntawm carbide, tau txo lub zog txiav txim siab; ④ Qhov nthuav tawm thermal no tsuas yog 0.9x10-6-1.18x10-2010-6,1 / 5 ntawm carbide, uas tuaj yeem txo cov khoom deformal thiab txhim kho qhov raug; ⑤ thiab cov ntaub ntawv tsis yog xim hlau yog tsawg affinity rau daim ntawv nodules.
Cubic boron nitride muaj cov tshuaj oxidation muaj zog thiab tuaj yeem txheej txheem hlau-muaj cov khoom siv hlau-muaj qis dua li yog qeeb thiab ua tau zoo yog tsawg. Lub pob zeb diamond tib lub pob zeb diamond muaj siab tawv, tab sis cov tawv tsis muaj txaus. Anisotropy ua rau nws yooj yim rau kev sib cais nrog (111) nto nyob rau hauv qhov cuam tshuam ntawm kev quab yuam sab nraud, thiab kev ua tau zoo. PCD yog cov polymer synthesized los ntawm micron cim pob zeb diamond me me los ntawm qee yam txhais tau tias. Cov chaotic xwm ntawm cov disordered txuam nrog ntawm cov lus ua rau nws macroscopic, thiab tsis muaj qhov kev coj ua thiab muaj zog thiab muaj zog thiab lub zog. Piv nrog rau ib qho-siv lead ua pob zeb diamond, cov qoob loo nplej ntawm PCD ua tau zoo txo lub anyotropy thiab ua kom zoo tshaj plaws cov khoom siv mechanical.
1. Tus qauv tsim ntawm PCD tej cuab yeej
(1) Qhov kev xaiv tsim nyog ntawm PCD Particle Qhov Loj
Theoretically, PCD yuav tsum sim ua kom zoo nkauj, thiab kev faib cov khoom sib ntxiv ntawm cov khoom yuav tsum tau ua kom kov yeej cov anisotropy. Qhov kev xaiv ntawm PCD me me loj yog tseem cuam tshuam nrog kev ua haujlwm. Feem ntau hais lus, PCD nrog lub zog siab, kev tsis zoo, tuaj yeem siv rau kev ua tiav thiab cov khoom noj zoo, thiab PCD ntawm coarse nplej yuav siv rau cov av ntxhib machining. PCD PCD me me yuav cuam tshuam rau kev coj ua kev ua tau zoo ntawm cov cuab yeej. Cov ntaub ntawv tseem ceeb uas cov ntsiab lus hais tias thaum muaj cov khoom siv nyoos loj, tab sis thaum cov noob txhuv loj me me, txoj cai no tsis siv tau.
Lwm yam kev sim uas xaiv plaub lub pob zeb diamond hmoov nrog qhov ntau thiab tsawg, 5um, thiab nws tau xaus lus, thiab nws tau xaus rau cov khoom siv raw, co diffuses ntau tusyees. Nrog rau qhov txo qis ntawm ②, cov coj tsis kam thiab kub ua rau kub maj mam txo qis.
(2) Kev xaiv tsim nyog ntawm cov hniav qhov ncauj qhov ncauj thiab cov hniav tuab
Daim ntawv ntawm cov hniav hniav lub qhov ncauj tsuas yog suav nrog plaub tus qauv: inverted ntug, blunt vajvoog, inverted ntug blunt lub voj voog composite thiab ntse kaum sab xis. Lub ntse angular qauv ua rau ntug ntse, qhov txiav ceev nrawm nrawm, txhim kho cov khoom txiav qis thiab lwm yam tsis muaj zog, tsis sib haum hlau cov hlau tiav. Lub obtuse cov qauv hloov tuaj yeem dhau cov hniav lub qhov ncauj, kev sib sau r kaum, kom tiv thaiv cov hniav tawg, haum rau kev ua nruab nrab / siab silicon aluminium alloy. Hauv qee kis tshwj xeeb, xws li qhov sib txig tsis zoo thiab me me pub rau kev pub mis, tus qauv puag ncig yog qhov zoo dua. Tus qauv ntug kev inverted tuaj yeem nce cov npoo thiab fab, tab sis tib lub sijhawm yuav nce siab, ntau haum rau kev thauj khoom hnyav siab silicon alloy.
Txhawm rau pab txhawb Edm, feem ntau xaiv cov txheej txheej PDC nyias nyias (0.3-1.0 hli), ntxiv rau txheej carbide, tag nrho cov tuab ntawm cov cuab yeej yog li 28mm. Lub carbide txheej yuav tsum tsis txhob tuab kom tsis txhob stratification tshwm sim los ntawm kev ntxhov siab sib txawv ntawm cov chaw uas tau sib khi
2, PCD Tuam Tsim Kev Tsim Kho
Kev tsim qauv ntawm PCD tuam ncaj qha txiav txim siab cov kev txiav kev ua tau zoo thiab kev pabcuam lub neej ntawm lub cuab tam, uas yog tus yuam sij rau nws daim ntawv thov thiab kev loj hlob. Kev tsim qauv tsim qauv ntawm PCD cov cuab yeej tau pom hauv daim duab 5.
(1) Kev tsim cov ntsiav tshuaj PCD (PDC)
① Kev tsim qauv ntawm PDC
PDC feem ntau yog muaj cov khoom siv hluav taws xob ntuj lossis hluavtaws hluavtaws thiab khuam tus neeg sawv cev ntawm qhov kub (1000-2000 lub siab (5-10 ultrasonic. Tus neeg sawv cev khi cov qauv siv cov hlua khi nrog TIC, Sic, Fe, Crystal yog embedded nyob rau hauv lub pob txha taub hau nyob rau hauv daim ntawv ntawm kev sib khi lus. PDC feem ntau yog ua rau disks nrog tsau daws thiab tuab, thiab sib tsoo thiab sib xws thiab lwm yam kev kho lub cev nqaij daim tawv thiab tshuaj txhuam. Hauv cov ntsiab lus, cov qauv zoo tagnrho ntawm PDC yuav tsum tau khaws cov yam ntxwv zoo ntawm tib lub cev muaj peev xwm ua tau, tib lub sijhawm, cov particle dd kev sib tw ua ke kom ntau li ntau tau,
② Kev faib tawm thiab xaiv cov hlua khi
Cov phau ntawv yog qhov tseem ceeb tshaj plaws cuam tshuam rau lub thermal stability ntawm PCD cuab tam, uas cuam tshuam ncaj qha cuam tshuam rau nws lub hardness, hnav tsis kam thiab thermal ruaj khov. Txoj kev raug PCI ib txwm muaj yog: hlau, cobalt, npib tsib xee thiab lwm yam kev hloov pauv. CO thiab W sib xyaw cov hmoov tau raug siv los ua tus neeg sawv cev sib xyaw, thiab cov kev ua tau zoo ntawm Sintering PCD tau zoo tshaj plaws yog 1450 ℃ thiab cov rwb thaiv tsev rau 4min. Sic, TIC, WC, TIB2, thiab lwm cov ntaub ntawv sib xyaws. Sic lub thermal stability ntawm sic yog zoo dua li ntawd ntawm co, tab sis lub hardness thiab pob txha lov thiab pob txha lov. Kev txo cov khoom tsim nyog ntawm cov khoom siv raw loj tuaj yeem txhim kho lub hardness thiab tawv ntawm PCD. Tsis muaj cov nplaum, nrog lwm cov khoom siv cov khoom siv hauv ultra-siab thiab kub siab hlawv rau hauv ib qho nanoscale pob zeb diamond (NPD). Siv graphite raws li prefursor los npaj NPD yog qhov kev xav tau tshaj plaws, tab sis hluavtaws NPD muaj lub zog zoo tshaj plaws thiab cov khoom siv zoo tshaj plaws.
Xaiv thiab Tswj ③ nplej
Cov khoom siv khoom ua pob zeb tau yog ib qho tseem ceeb cuam tshuam rau kev ua tau zoo ntawm PCD. Detreating pob zeb diamond micropowder, ntxiv me me ntawm cov tshuaj uas cov kev xaiv tsis tsim nyog tuaj yeem inhibit kev loj hlob ntawm pob zeb diamond txawv txav.
High Bright NPD nrog cov qauv qauv sib xws tuaj yeem tshem tawm cov anisotropy thiab txuas ntxiv txhim kho cov khoom siv neeg kho tshuab. Tus nanographite precursor hmoov npaj los ntawm high zog pob cov ntsiab lus ntawm lub taub hau kub thiab 2100-2300-2300-2300-2300-2300 thiab 2100-2300
④ Kho Tshuaj Kho Mob lig
Ntawm tib lub ntsuas kub (200 ° ℃) thiab sijhawm (20H), kev cob qhia kev tshem tawm ntawm Lewis acid-fecl3 tau zoo dua li ntawm HCL yog 10-15G / 100mL. Lub thermal stability ntawm PCD txhim kho raws li cobalt tshem tawm qhov tob. Rau coarse-grained loj hlob PCR, muaj zog acid kho tau kom tiav kiag li, tab sis muaj ntau yam cuam tshuam ntawm cov kev ua tau zoo polymer; Ntxiv Tic thiab WC kom hloov cov cuab yeej hluavtaws polycrystal thiab sib txuas nrog cov tshuaj acid muaj zog los txhim kho qhov ruaj khov ntawm PCD. Txog tam sim no, txheej txheem npaj ntawm PCD cov ntaub ntawv yog kev txhim kho, lub anisotropy tau zoo heev, tau paub kev lag luam kev lag luam, kev lag luam cuam tshuam tab sis loj hlob sai.
(2) ua ntawm PCD hniav
① Cov txheej txheem txiav
PCD muaj lub hardness siab, hnav tsis zoo thiab cov txheej txheem kev phom sij siab.
② vuam txheej txheem
PDC thiab rab riam lub cev los ntawm cov neeg kho tshuab clamp, tsevneeg thiab brazing. Brazing yog mus nias PDC ntawm lub carbide matrix, suav nrog lub tshuab nqus tsev, thiab lwm yam Cov nqi qis thiab siab rov qab, thiab tau siv dav. Lub vuam zoo yog cuam tshuam nrog flux, vuam alloy thiab vuam kub. Vuam kub (feem ntau qis dua 700 ° ℃) muaj qhov kub tshaj plaws, lossis txawm tias cuam tshuam nrog kub heev yuav ua rau tsis muaj qhov txaus ntshai welding muaj zog. Qhov kev sib tw kub tuaj yeem tswj tau lub sijhawm rwb thaiv tsev thiab qhov tob ntawm PCD liab.
Hniav Sib Tsoo Hniav Sib Tsoo
PCD twj sib tsoo txheej txheem yog tus yuam sij rau tsim cov txheej txheem. Feem ntau, cov nqi siab tshaj ntawm cov hniav thiab cov hniav yog li ntawm 5um, thiab arc vojvoog yog li ntawm 4um; Sab hauv ntej thiab nram qab txiav saum npoo kom pom tseeb qhov chaw tas li, thiab txawm tias txo cov kev xav tau ntawm lub ntsej muag, ua cov chips ntws raws riam mus pem hauv ntej thiab tiv thaiv riam.
Hniav sib tsoo cov txheej txheem xws li pob zeb diamond sib tsoo tshuab hluav taws xob sib tsoo (elid), Composite hniav sib tsoo machining. Ntawm lawv, lub pob zeb diamond sib tsoo log tshuab cov hniav sib tsoo yog cov paub tab uas paub ntau ntxiv.
Lwm yam kev sim: ① Cov coarse particle sib tsoo yuav ua rau mob hniav loj heev, thiab qhov ua tau zoo ntawm cov hniav sib tsoo txo qis; Lub particle loj ntawm ② sib tsoo log yog ze ze rau cov hniav zoo ntawm cov cuab yeej PCD cov cuab yeej siv, tab sis tau muaj cov cuab yeej siv hluav taws xob PCD cov cuab yeej siv.
Lwm yam kev tshawb fawb hauv tsev thiab txawv teb chaws feem ntau yog tsom rau ntawm lub tshuab thiab cov txheej txheem ntawm cov hniav sib tsoo. Nyob rau hauv cov hniav sib tsoo mechanism kev tshem tawm thiab kev tshem tawm cov tshuab thiab cov tshuab tshem tawm yog qhov tseem ceeb, thiab kev tshem tawm thiab qaug zog me me. Thaum sib tsoo, raws li lub zog thiab kub ua rau muaj qhov sib txawv ntawm cov kev sib tsoo, txhim kho kev sib tsoo, txhim kho kev sib tsoo, thiab txo cov kev tshem tawm ntawm thuv. Qhov saum npoo av roughness ntawm kev sib tsoo qhuav yog tsawg, tab sis yooj yim vim qhov kev kub siab, hlawv roj saum npoo,
Hniav sib tsoo cov txheej txheem yuav tsum tau them sai sai rau: ① Xaiv cov kab mob sib tsoo ua kom zoo dua, tom hauv ntej thiab rov qab cov hniav sib tsoo zoo dua. Txawm li cas los xij, tseem xav txog qhov sib tsoo siab, poob loj, muaj kev sib tsoo qis, tus nqi siab; Xaiv cov kev sib tsoo uas tsim nyog zoo, suav nrog phau ntawv sib tsoo, pom zoo, sib tsoo cov khaub ncaws kom qhuav, thaum txhim kho qhov tsis zoo ntawm cov cuab yeej.
Txawv khi khi pob zeb diamond sib tsoo muaj cov yam ntxwv sib txawv, thiab sib sib sib tsoo sib txawv thiab cov nyhuv. Resin bindiam pob zeb pob zeb pob zeb lub log yog qhov sib tsoo yooj yim, cov kab sib tsoo tau yooj yim, cov hniav sib tsoo tau yooj yim, hniav sib tsoo los hnav cov cim, loj roughness; Hlau bern pob zeb diamond sib tsoo lub log yog khaws cia ntse, txawm tias muaj peev xwm sib tsoo, thiab cov kev sib tsoo yog qhov yooj yim tawm ntawm kev cuam tshuam tus kheej, ua rau muaj kev sib tsoo, ua rau muaj kev puas tsuaj loj; Ceramic berder pob zeb diamond sib tsoo lub log muaj qhov ua kom muaj zog, muaj peev xwm ua kom muaj zog, tuaj yeem yoog raws kev sib tsoo, muaj qhov sib tsoo ntawm cov pits ntawm lub pits ntawm lub cuab tam ntawm lub cuab tam ntawm lub cuab tam. Siv raws li cov khoom ua haujlwm, kev sib tsoo ua kom zoo, cov av tsis muaj zog depability thiab qhov chaw ua haujlwm zoo.
Kev tshawb fawb txog kev sib tsoo efficiency tsuas yog tsom rau kev txhim kho cov khoom lag luam thiab tswj tus nqi. Feem ntau, kev sib tsoo tsawg Q (PCD kev tshem tawm ib lub sijhawm) thiab hnav piv g (piv ntawm PCD kev tshem tawm lub log ploj) yog siv los ua kev tshuaj ntsuam xyuas.
German ntawv KENTER SIB TSOO Pcd Tuam nrog qhov siab tsis tu ncua, PNC me ntsis concentration, tus nqi sib tsoo thiab hnav piv yog txo qis; ② tsub kev sib tsoo qhov loj me me, nce lub siab tas li, nce cov concentration ntawm pob zeb diamond, sib tsoo tus nqi thiab hnav kev piv txwv; ③ Binder hom yog txawv, kev sib tsoo tus nqi thiab hnav piv yog txawv. KENTER Cov hniav sib tsoo txheej txheem ntawm PCD cov cuab yeej tau kawm kev siv, tab sis cov hniav ntawm cov hniav sib tsoo txheej txheem tsis yog tshuaj ntsuam systematically.
3. Siv thiab ua tsis tiav ntawm PCD tej cuab yeej
(1) Xaiv cov cuab yeej txiav tsis
Thaum lub sijhawm pib lub sijhawm ntawm PCD tuam tsev, tus ntug ntug ntse tau dhau los, thiab machines qhov khoom zoo tau los ua tau zoo dua. Passivation tuaj yeem tshem tawm cov micro sib txawv thiab cov pob txha me tau coj los sib tsoo, thiab kho cov npoo zoo, yog li txhim kho qhov chaw ua haujlwm zoo.
PCD tuam chaw thooj Milling Alloy Alloy, kev txiav ceev feem ntau nyob rau hauv 4000m / min, kev ua haujlwm yog feem ntau ntawm cov hlau siab-siv cov hlau siab dua tshiab-300-1000M / min). Pub ntim feem ntau pom zoo ntawm 0.08-0.15mm / r. Cov pub noj loj heev, muaj zog txiav kev txiav, nce cov khoom lag luam ntawm cov chaw ua haujlwm ntawm cov chaw ua haujlwm; Kev noj me me dhau, muaj kev txiav ntau yam kev txiav, thiab muaj kev nce ntxiv. Qhov tob nce, lub zog txiav nce, qhov txiav kom sov, lub neej txo qis qhov tob tuaj yeem yooj yim ua rau hniav sib tsoo; Kev txiav me me yuav ua rau machining hardinging, hnav thiab txawm tias muab hniav poob khoom.
(2) hnav daim ntawv
Cuab cuab tam ua haujlwm ua haujlwm, vim kev sib txhuam, qhov kub thiab lwm yam, hnav yog kev tsis pom kev. Kev hnav ntawm lub tuam txhab pob zeb diamond muaj peb theem: thawj zaug kev pib ua kom tiav theem nrog cov nqi hloov pauv, thiab cov theem txuas sai dua, thiab cov khoom siv nrawm dua. Kev hnav nrawm nrawm qhia tias cov cuab yeej tsis ua haujlwm thiab yuav tsum tau ua haujlwm. Hnav cov cuab yeej muaj cov cuab yeej nplaum muaj zog (sib txawv vuam hnav), diffusion hnav, abrasive hnav, oxidation hnav, thiab lwm yam.
Txawv los ntawm cov cuab yeej ib txwm muaj, hnav daim ntawv ntawm PCD cov cuab yeej yog nplaum hnav, diffusion hnav thiab polycrystalline txheej kev puas tsuaj. Ntawm lawv, qhov kev puas tsuaj ntawm polycystal txheej yog qhov laj thawj tseem ceeb, uas yog qhov sib txawv ntawm cov kab mob lub cev, uas muaj peev xwm ua rau kev txo lub cev lossis cov ntawv sib txawv thiab cov ntawv ntawm workpieces. PCD me me qhov loj me, cov yas daim ntawv, lub kaum thiab cov khoom siv hniav ua haujlwm yuav cuam tshuam nrog cov txheej txheem kev puas tsuaj, thiab tom qab ntawd ua rau kev puas tsuaj ntawm polycystal txheej. Hauv kev xyaum ua engineering, cov khoom tsim nyog cov khoom tsim nyog rau qhov loj me, cov cuab yeej tsis muaj kev xaiv thiab cov tsis tau xaiv raws li cov kev mob.
4. Kev tsim kho ntawm PCD tej cuab yeej
Tam sim no, daim ntawv thov ntau ntawm PCD cov cuab yeej tau nthuav dav los ntawm ib txwm tig mus drilling, milling, kev siv ceev, thiab tau siv dav hauv tsev thiab txawv teb chaws. Kev loj hlob sai ntawm hluav taws xob tsheb tsis tsuas yog coj kev cuam tshuam rau cov kev lag luam ib txwm muaj, tab sis kuj tau pom kev lag luam tsheb ua kom nrawm dua thiab kev txhim kho tshiab.
Qhov kev thov dav ntawm PCD tej cuab yeej tau nqus thiab nce cov kev tshawb fawb thiab kev nthuav dav ntawm cov cuab yeej. Nrog rau qhov tob tob ntawm kev tshawb fawb, PDC cov lus qhia me me tau txais me dua thiab cov tshuaj sib tsoo thiab hnav zoo dua thiab siab dua, cov qauv thiab cov qauv muaj kev sib txawv. Cov kev tshawb fawb tshawb fawb ntawm PCD cov cuab yeej muaj xws li: ① Tshawb nrhiav thiab txhim kho cov txheej PCD); ② Tshawb nrhiav thiab tsim cov cuab yeej PCD tshiab; Tshawb nrhiav kom zoo dua vuam pcd cov cuab yeej thiab txuas ntxiv txo tus nqi; ④ Kev tshawb fawb txhim kho PCD tuam txhab hniav sib tsoo txheej txheem los txhim kho kev ua tau zoo; ⑤ Kev tshawb fawb ua rau cov tshuaj PCD cov cuab yeej thiab siv cov cuab yeej raws li cov haujlwm hauv nroog; ⑥ Kev tshawb fawb rationallyrally xaiv cov tsis raws li cov ntaub ntawv ua tiav.
Luv luv
(1) PCD tuam kev txiav ua tau zoo, tsim kom muaj qhov tsis txaus ntawm ntau cov cuab yeej carbide; Nyob rau tib lub sijhawm, tus nqi qis dua qis dua li ib leeg siv lead ua pob zeb diamond cuab yeej, hauv kev txiav niaj hnub, yog cov cuab yeej pheej yig;
(2) raws li hom thiab kev ua haujlwm ntawm cov ntaub ntawv txheej txheem, cov kev xaiv tsim nyog ntawm particle loj thiab cov ntsuas ntawm cov cuab yeej siv ntawm cov cuab yeej tsim thiab siv,
(3) PCD cov khoom muaj lub siab tawv, uas yog cov khoom siv uas zoo tshaj plaws rau kev txiav lub nroog, tab sis nws kuj coj qhov nyuaj rau kev txiav cov cuab yeej tsim. Thaum tsim khoom, kom nkag siab txog cov txheej txheem nyuaj thiab kev ua haujlwm xav tau, txhawm rau ua tiav tus nqi zoo tshaj plaws;
(4) PCD ua cov khoom siv hauv Riam nroog, peb yuav tsum tau xaiv cov kev ua haujlwm ntawm lub neej kom ua tiav cov khoom lag luam ntawm lub neej, ntau lawm kev ua haujlwm thiab khoom zoo;
(5) Kev tshawb fawb thiab tsim cov cuab yeej PCD tshiab tshiab los kov yeej cov kev tsis sib haum xeeb
Kab lus no yog los ntawm "SUPERUAND COV NETWORK"
Lub Sijhawm Post: Lub sijhawm 25-2025
