Cemented carbides yog tsim los ntawm kev sib xyaw tungsten carbide nrog cobalt hauv ib qho piv txwv, nias rau hauv ntau yam duab, thiab tom qab ntawd semi-sintering.Cov txheej txheem sintering no feem ntau yog ua nyob rau hauv lub tshuab nqus tsev vacuum.Nws yog sintered nyob rau hauv lub tshuab nqus tsev qhov cub ntawm qhov kub ntawm txog 1,300 txog 1,500 degrees Celsius.
Tshwj xeeb-shaped bar
Sintered hard alloy forming yog nias hmoov rau hauv billet, thiab ces mus rau hauv lub sintering rauv cua sov rau ib tug tej yam kub (sintering kub), thiab tuav ib tug tej lub sij hawm (tuav lub sij hawm), thiab ces txias, thiaj li yuav tau txais qhov yuav tsum tau kev ua tau zoo. cov khoom siv hard alloy.
Cov txheej txheem cemented carbide sintering tuaj yeem muab faib ua plaub theem:
1: Tshem tawm ntawm kev tsim tus neeg sawv cev thiab ua ntej tua hluav taws, nyob rau theem no lub cev sintered hloov raws li hauv qab no:
Kev tshem tawm ntawm tus neeg sawv cev molding, thaum pib ntawm sintering nrog qhov kub thiab txias, tus neeg sawv cev molding maj mam decompose los yog vaporize, tsis suav nrog lub cev sintered, tib lub sijhawm, molding tus neeg sawv cev ntau dua los yog tsawg dua rau lub cev sintered carburizing, carburizing tus nqi yuav hloov. nrog rau hom molding tus neeg sawv cev, tus naj npawb thiab cov txheej txheem sintering sib txawv.
Qhov saum npoo oxides ntawm cov hmoov raug txo.Thaum sintering kub, hydrogen tuaj yeem txo cov oxides ntawm cobalt thiab tungsten.Yog tias tus neeg sawv cev raug tshem tawm hauv lub tshuab nqus tsev thiab sintered, cov tshuaj tiv thaiv carbon-oxygen tsis muaj zog.Kev sib cuag kev ntxhov siab ntawm cov hmoov hmoov yog maj mam tshem tawm, cov hmoov hlau sib txuas pib rov qab thiab rov ua dua tshiab, qhov chaw diffusion pib tshwm sim, thiab lub zog ntawm cov thaiv tau txhim kho.
2: Khoom theem sintering theem (800 ℃ - eutectic kub)
Nyob rau ntawm qhov kub thiab txias ua ntej cov tsos ntawm cov kua theem, ntxiv rau kev txuas ntxiv cov txheej txheem tshwm sim nyob rau hauv lub dhau los theem, cov tshuaj tiv thaiv thiab diffusion yog intensified, yas ntws yog txhim khu kev qha, thiab sintered lub cev zoo li pom tseeb shrinkage.
3: kua theem sintering theem (eutectic kub - sintering kub)
Thaum muaj cov kua theem nyob rau hauv lub cev sintered, lub shrinkage yog sai sai ua kom tiav, thiab tom qab ntawd lub crystallization hloov tshwm sim, tsim cov microstructure yooj yim thiab cov qauv ntawm cov alloy.
4: txias theem (sintering kub - chav tsev kub)
Nyob rau theem no, lub microstructure thiab theem muaj pes tsawg leeg ntawm alloy hloov nrog qhov sib txawv txias txias, uas yuav siv tau los kho cua sov ntawm cemented carbide los txhim kho nws lub cev thiab txhua yam khoom.
Post lub sij hawm: Feb-10-2023
