Hlau hmoov atomization comminuting txheej txheem

Txoj kev npaj hmoov los ntawm impinging los yog txwv tsis pub rhuav cov hlau los yog alloy kua rau hauv me me tee dej los ntawm ib tug ceev-tsav kua (atomizing nruab nrab) thiab ces condensing lawv mus rau hauv cov hmoov. Atomization yog txoj kev zoo tshaj plaws los tsim cov hmoov nplej siab, uas yog hu ua pre-alloyed hmoov. Txhua qhov ntawm cov hmoov tsis tsuas yog muaj tib yam tshuaj lom neeg muaj pes tsawg leeg raws li cov khoom siv molten alloy, tab sis kuj ua kom cov qauv crystalline vim yog kev sib zog sai, thiab tshem tawm cov macro-segregation ntawm theem ob.

Txoj kev atomization tuaj yeem muab faib ua ob hom: "Ob txoj kev ntws" (crushing alloy kua ntws los ntawm atomizing nruab nrab ntws) thiab "Single-flow method" (crushing alloy kua ntws los ntawm lwm txoj kev). 846 tus qub tau muab faib ua roj (helium, pos huab, nitrogen, cua) thiab kua (dej, roj) atomization nruab nrab, tom kawg xws li centrifugal atomization thiab yaj roj nqus atomization.

Txoj kev siv dav tshaj plaws yog roj atomization thiab dej atomization. Nyob rau hauv cov txheej txheem atomization, cov hlau nyoos yog yaj mus rau hauv cov kua hlau uas tsim nyog (overheated 100 ~ 150 ° C) nyob rau hauv ib qho hluav taws xob los yog induction rauv, thiab tom qab ntawd txhaj rau hauv lub tundish nyob saum lub atomization nozzle. Cov kua alloy ntws tawm hauv qab lub qhov ntawm Tundish, thiab yog atomized rau hauv me me tee dej thaum nws ntsib nrog high-ceev huab cua los yog dej ntws los ntawm lub nozzle. Feem ntau, cov roj inert atomized hmoov yog puag ncig hauv cov duab nrog cov ntsiab lus qis tshaj plaws (hauv qab L00 × 10) thiab tuaj yeem ua rau cov khoom lag luam ncaj qha los ntawm cov txheej txheem thermoforming xws li kub isostatic nias. Feem ntau ntawm cov dej atomized hmoov hmoov muaj cov duab tsis zoo, cov ntsiab lus oxygen siab (siab tshaj 600 × 10) thiab yuav tsum tau muab tshem tawm, tab sis lawv muaj compressibility zoo thiab tuaj yeem tsim los ntawm txias nias thiab tom qab ntawd sintered rau hauv cov khoom siv tshuab.

Cov txheej txheem atomization saum toj no yog ib qho yooj yim rau kev lag luam hauv ntau qhov ntau, tab sis vim tias cov kua hlau alloy yog nyob rau hauv kev sib cuag nrog cov slag thiab Refractory crucible, nws yog ib qho inevitable uas tsis yog-hlau inclusions tau nkag mus rau hauv cov hmoov nplej. Yog li ntawd, raws li txoj cai ESR, Soderfors Powder Company ntawm Sweden thawj zaug hloov Tundish nrog lub peev xwm ntawm 7 T mus rau hauv ib qho ESR (electroslag cua sov) cov khoom, cov ntsiab lus ntawm non-metallic inclusions nyob rau hauv cov hmoov ntawm high-speed steel los ntawm nitrogen atomization raug txo mus rau 1/10 ntawm cov ntsiab lus qub, thiab lub zog dabtsi yog khoov ntawm ASP 0000000 MPa high speed steel .

Txoj kev ntsuas kom tsis txhob muaj oxide paug tag nrho thiab ua tau zoo yog siv txoj kev "Single-flow" atomization method, piv txwv li, rotating electrode atomization method (saib rotating electrode method). Tsis tas li ntawd, muaj lub tshuab nqus tsev atomization txoj kev tuaj yeem tsim cov hmoov zoo-purity kheej kheej. Lub hauv paus ntsiab lus yog: thaum cov roj supersaturated alloy kua nyob rau hauv siab mam li nco dheev raug rau lub nqus tsev vacuum, cov roj yaj yuav khiav thiab nthuav, ua rau cov kua alloy atomization, thiab ces condensed rau hauv hmoov. Rau cov npib tsib xee, tooj liab, cobalt, hlau thiab txhuas matrix alloys, cov txheej txheem ntawm dissolving hydrogen tuaj yeem siv los ua kom tiav lub tshuab nqus tsev vacuum atomization hmoov.