Artificial ib leeg pob zeb diamond tau maj mam tsim tom qab xyoo 1950.Nws yog synthesized los ntawm graphite li raw khoom, ntxiv nrog ib tug catalyst, thiab raug rau kub thiab ultra-siab siab.Artificial polycrystalline pob zeb diamond (PCD) yog cov khoom siv polycrystalline tsim los ntawm polymerization ntawm pob zeb diamond hmoov siv hlau binders xws li Co, Ni, thiab lwm yam. Artificial polycrystalline pob zeb diamond yog ib yam khoom tshwj xeeb ntawm cov hmoov metallurgy, uas kos rau ntawm qee txoj kev thiab txhais tau tias ntawm cov pa hmoov. metallurgy hauv nws txoj kev tsim khoom.
Thaum lub sij hawm sintering txheej txheem, vim yog ntxiv ntawm additives, ib tug bonding choj muaj feem ntau ntawm Co, Mo, W, WC, thiab Ni yog tsim los ntawm PCD muaju, thiab pob zeb diamond yog ruaj khov nyob rau hauv lub sturdy moj khaum tsim los ntawm kev sib txuas choj.Lub luag haujlwm ntawm cov hlau khi yog ruaj khov tuav lub pob zeb diamond thiab siv tag nrho nws cov kev txiav.Tsis tas li ntawd, vim muaj kev faib tawm dawb ntawm cov nplej hauv ntau cov lus qhia, nws yog qhov nyuaj rau cov kab nrib pleb kom nthuav tawm ntawm ib qho nplej mus rau lwm qhov, uas txhim kho lub zog thiab tawv ntawm PCD zoo heev.
Hauv qhov teeb meem no, peb yuav qhia luv luv txog qee yam ntawm cov yam ntxwv ntawmPCD ntxig.
1. Ultra siab hardness thiab hnav tsis kam: unparalleled nyob rau hauv cov khoom, cov ntaub ntawv muaj ib tug hardness txog li 10000HV, thiab lawv hnav tsis kam yog ze li ntawm ib puas npaug ntawm Carbide insert;
2. Lub hardness, hnav tsis kam, microstrength, nyuaj hauv kev sib tsoo, thiab kev sib txhuam coefficient ntawm anisotropic ib leeg siv lead ua pob zeb diamond siv lead ua thiab cov khoom siv ua haujlwm sib txawv heev hauv cov qauv siv lead ua sib txawv thiab kev taw qhia.Yog li ntawd, thaum tsim thiab tsim ib qho siv lead ua pob zeb diamond cov cuab yeej, nws yog ib qho tsim nyog yuav tsum xaiv cov khoom siv lead ua kom raug, thiab siv lead ua orientation yuav tsum tau ua rau cov khoom siv pob zeb diamond.Kev xaiv ntawm lub hauv ntej thiab sab nraub qaum ntawm PCD txiav cov cuab yeej yog ib qho teeb meem tseem ceeb hauv kev tsim ib qho siv lead ua PCD tshuab dhos;
3. Tsis tshua muaj kev sib txhuam coefficient: Pob zeb diamond inserts muaj qhov sib txhuam coefficient qis dua thaum ua qee cov khoom siv hlau tsis muaj hlau piv rau lwm cov inserts, uas yog ib nrab ntawm cov carbides, feem ntau nyob ib ncig ntawm 0.2.
4. Lub PCD txiav ntug yog qhov ntse heev, thiab lub vojvoog ntawm qhov txiav tuaj yeem ncav cuag 0.1-0.5um.Thiab tej yam ntuj tso siv lead ua pob zeb diamond cuab yeej siv tau nyob rau hauv qhov ntau ntawm 0.002-0.005um.Yog li ntawd, cov cuab yeej pob zeb diamond ntuj tuaj yeem ua ultra-nyias txiav thiab ultra-precision machining.
5. Lub coefficient ntawm thermal expansion ntawm pob zeb diamond nrog qis coefficient ntawm thermal expansion yog me dua li ntawm cemented carbide, txog 1/10 ntawm high-speed steel.Yog li ntawd, cov cuab yeej txiav pob zeb diamond tsis tsim cov thermal deformation tseem ceeb, txhais tau hais tias qhov kev hloov pauv ntawm cov cuab yeej loj los ntawm kev txiav cov cua sov yog tsawg, uas yog qhov tseem ceeb tshwj xeeb rau precision thiab ultra precision machining nrog qhov siab precision qhov yuav tsum tau ua.
Kev siv cov pob zeb diamond txiav cov cuab yeej
PCD ntxigfeem ntau yog siv rau kev kub ceev txiav / tho txawv / milling ntawm cov hlau tsis-ferrous thiab cov ntaub ntawv tsis-ferrous hlau, haum rau kev ua ntau yam hnav-resistant non-metallic cov ntaub ntawv xws li iav fiber ntau thiab cov ntaub ntawv ceramic;Ntau yam uas tsis yog-ferrous hlau: txhuas, titanium, silicon, magnesium, thiab lwm yam, nrog rau ntau yam uas tsis yog-ferrous hlau tiav txheej txheem;
Disadvantages: tsis zoo thermal stability.Txawm hais tias nws yog cov cuab yeej txiav nrog qhov siab tshaj plaws hardness, nws qhov kev txwv tsis pub qis dua 700 ℃.Thaum lub txiav kub siab tshaj 700 ℃, nws yuav poob nws thawj ultra-siab hardness.Qhov no yog vim li cas cov cuab yeej pob zeb diamond tsis haum rau machining ferrous hlau.Vim tias tsis muaj tshuaj lom neeg ruaj khov ntawm cov pob zeb diamond, cov pa roj carbon hauv cov pob zeb diamond yuav cuam tshuam nrog cov hlau atoms ntawm qhov kub thiab txias, thiab yuav hloov mus rau hauv cov qauv graphite, ua rau kev puas tsuaj ntawm cov cuab yeej.
Post lub sij hawm: May-17-2023