Lub sintering ntawmcemented carbideyog kua theem sintering, piv txwv li lub re-bonding theem yog nyob rau hauv cov kua theem.Cov ntawv xovxwm yog rhuab mus rau 1350 ° C-1600 ° C hauv lub tshuab nqus tsev.Lub linear shrinkage ntawm pressed billet thaum sintering yog hais txog 18% thiab lub ntim shrinkage yog nyob ib ncig ntawm 50%.Tus nqi pes tsawg ntawm qhov shrinkage nyob ntawm seb qhov loj me ntawm cov hmoov thiab muaj pes tsawg leeg ntawm cov hlau.
Sintering ntawmcemented carbideyog cov txheej txheem physicochemical complex, uas suav nrog kev tshem tawm plasticizer, degassing, khoom theem sintering, kua theem sintering, alloying, densification, yaj los nag thiab lwm yam txheej txheem.Cov ntawv xovxwm yog sintered nyob rau hauv tej yam kev mob los tsim ib yam khoom nrog ib tug tej yam tshuaj muaj pes tsawg leeg, qauv, zog thiab cov duab thiab loj.Cov txheej txheem txheej txheem no sib txawv heev nyob ntawm seb lub sintering unit.
Cemented carbide nqus tsev sintering yog txheej txheem uas sintering tau ua tsawg dua 1 atm (1 atm = 101325 Pa).Sintering nyob rau hauv lub tshuab nqus tsev zoo heev txo cov hindrance ntawm densification los ntawm cov pa adsorbed ntawm cov hmoov av thiab cov roj nyob rau hauv lub qhov hws kaw, uas yog conducive mus rau lub diffusion txheej txheem thiab densification, zam cov tshuaj tiv thaiv ntawm cov hlau thiab ib co ntsiab lus nyob rau hauv cov huab cua thaum lub sij hawm. Cov txheej txheem sintering, thiab tuaj yeem txhim kho qhov ntub dej ntawm cov kua dej khov thiab cov theem nyuaj, tab sis lub tshuab nqus tsev sintering yuav tsum tau ua tib zoo saib xyuas kom tsis txhob poob ntawm cobalt evaporation.Lub tshuab nqus tsev sintering feem ntau tuaj yeem muab faib ua plaub theem, piv txwv li cov txheej txheem tshem tawm plasticizer, theem ua ntej sintering, kub kub sintering theem thiab txias theem.
Cov txheej txheem tshem tawm plasticizer pib los ntawm chav tsev kub thiab nce mus txog 200 ° C.Cov pa roj adsorbed rau ntawm qhov chaw ntawm cov hmoov nplej nyob rau hauv lub billet yog sib cais los ntawm qhov chaw ntawm cov khoom nyob rau hauv qhov kev txiav txim ntawm tshav kub thiab khiav tawm ntawm lub billet tsis tu ncua.Lub plasticizer nyob rau hauv lub billet yog rhuab thiab khiav tawm ntawm lub billet.Kev tuav lub tshuab nqus tsev siab yog qhov tsim nyog rau kev tso tawm thiab khiav tawm ntawm cov pa roj.Ntau hom plasticizers muaj cov khoom sib txawv thaum raug tshav kub, yog li cov txheej txheem tshem tawm plasticizer yuav tsum tau tsim raws li qhov xwm txheej tshwj xeeb.
Cov txheej txheem tshem tawm cov yas yas yuav tsum tau txiav txim siab raws li qhov xwm txheej tshwj xeeb ntawm kev sim.Qhov dav dav plasticizer gasification kub yog qis dua 550 ℃.
Pre-sintering theem yog hais txog qhov kub thiab txias sintering ua ntej sintering, kom cov tshuaj oxygen hauv cov hmoov thiab cov pa roj carbon monoxide txo cov tshuaj tiv thaiv kom tsim cov pa roj carbon monoxide tawm hauv cov xovxwm billet, yog tias cov roj no tsis tuaj yeem raug cais tawm thaum cov kua theem tshwm, yuav dhau los ua qhov kaw qhov pore residue nyob rau hauv cov hlau, txawm hais tias lub zog sintering, nws yog qhov nyuaj rau kev tshem tawm.Ntawm qhov tod tes, lub xub ntiag ntawm oxidation yuav cuam tshuam rau lub wettability ntawm cov kua theem mus rau theem nyuaj thiab nws thiaj li cuam tshuam rau cov txheej txheem densification ntawm cemented carbide.Ua ntej cov kua theem tshwm, nws yuav tsum tau degassed txaus thiab lub tshuab nqus tsev siab tshaj plaws yuav tsum tau siv.
Lub sintering kub thiab sintering lub sij hawm yog cov txheej txheem tseem ceeb tsis rau lub densification ntawm lub billet, tsim ib homogeneous qauv thiab nrhiav tau ntawm cov khoom yuav tsum tau.Lub sintering kub thiab sintering lub sij hawm nyob ntawm seb lub alloy muaj pes tsawg leeg, hmoov loj, sib tsoo lub zog ntawm cov sib tov thiab lwm yam, thiab kuj yog tswj los ntawm tag nrho cov tsim ntawm cov khoom.
Post lub sij hawm: Jun-08-2023
