Tau ntev, ntau tus neeg hauv kev lag luam tau ntseeg tias cemented carbide yog tungsten steel. Niaj hnub no peb yuav tham txog qhov sib txawv ntawm cemented carbide thiab tungsten hlau.
01 Cemented carbide
Cemented carbide yog ua los ntawm cov khoom siv tawv tawv ntawm cov hlau refractory thiab cov hlau sib txuas los ntawm cov hmoov hlau metallurgy, thiab yog cov khoom siv alloy nrog cov hardness siab heev. Tungsten carbide (WC) yog cov khoom tseem ceeb ntawm cov cemented carbide, suav txog 70% -97% ntawm tag nrho cov muaj pes tsawg leeg; cov hlau nplaum yog siv rau kev sib txuas ntawm cov hlau, thiab cov ntsiab lus feem ntau yog 3% -30%. Thaum lub sij hawm sintering txheej txheem, Nws tuaj yeem nyob ib puag ncig thiab khi cov tungsten carbide hmoov kom nruj ua ke, thiab nws dhau los ua cov cemented carbide tom qab txias.
Yog li ntawd, feem ntau siv cemented carbides tau muab faib ua peb pawg raws li lawv qhov muaj pes tsawg leeg thiab kev ua haujlwm zoo: tungsten-cobalt, tungsten-titanium-cobalt, thiab tungsten-titanium-tantalum (niobium). Feem ntau siv hauv kev tsim khoom yog tungsten-cobalt thiab tungsten-titanium-cobalt cemented carbides.
1) Tungsten-cobalt carbide
Cov khoom tseem ceeb yog tungsten carbide (WC) thiab cobalt. Cov qib yog sawv cev los ntawm lub npe code YG (" nyuaj" thiab" cobalt" hauv Suav pinyin prefix), ua raws li feem pua ntawm cov ntsiab lus cobalt. Piv txwv li, YG6 sawv cev rau tungsten-cobalt cemented carbide nrog cov ntsiab lus cobalt ntawm 6%, thiab cov ntsiab lus tungsten carbide ntawm 94%.
2) Tungsten-titanium-cobalt cemented carbide
Cov khoom tseem ceeb yog tungsten carbide (WC), titanium carbide (TiC) thiab cobalt. Cov qib yog sawv cev los ntawm lub npe code YT (" nyuaj" thiab" titanium" hauv Suav pinyin prefix), ua raws li feem pua ntawm cov ntsiab lus titanium carbide. Piv txwv li, YT15 sawv cev rau tungsten-titanium-cobalt cemented carbide nrog 15% titanium carbide cov ntsiab lus.
3) Tungsten titanium tantalum (niobium) nyuaj alloy
Hom cemented carbide no tseem hu ua cov cemented carbide lossis universal cemented carbide. Cov khoom tseem ceeb yog tungsten carbide (WC), titanium carbide (TiC), tantalum carbide (TaC) lossis niobium carbide (NbC) thiab cobalt. Cov qib yog sawv cev los ntawm tus lej YW (lub npe ntawm Suav pinyin ntawm" nyuaj" thiab" wan") ua raws li tus lej.
Feem ntau siv cemented carbide qib thiab tshuaj muaj pes tsawg leeg:
Note:"X" tom qab lub npe lub npe txhais tau tias nplua-grain alloy," C" txhais tau hais tias coarse-grain alloy, thiab tsis muaj lo lus hais txog general-grain alloy.
02 Qhov txawv ntawm tungsten steel thiab cemented carbide
Feem ntau hais lus, tungsten steel yog smelted los ntawm kev ntxiv tungsten raw cov ntaub ntawv rau hauv molten steel los ntawm cov txheej txheem steelmaking. Nws tseem hu ua high-speed steel los yog cov cuab yeej hlau, thiab nws cov ntsiab lus tungsten feem ntau yog 15-25%. Ntxiv nrog rau kev tsim cov hlau kub ceev los ntawm txoj kev smelting, kuj tseem muaj cov hmoov hlau metallurgy high-speed steels, uas tsis txhob muaj kev sib cais ntawm carbides los ntawm txoj kev smelting los ua kom muaj zog thiab kho cua sov deformation.
Cov cemented carbide yog sintered nrog cobalt lossis lwm cov hlau sib txuas siv cov hmoov hlau metallurgy nrog tungsten carbide ua lub cev tseem ceeb, thiab nws cov ntsiab lus tungsten feem ntau yog ntau tshaj 80%.
Cias muab, tag nrho cov alloys nrog ib tug hardness tshaj HRC65 yuav hu ua cemented carbide, yog li tungsten steel belongs rau cemented carbide; Tab sis nruj me ntsis hais lus, cemented carbide tsis tas tungsten hlau.
