Vanadium cov ntaub ntawv VAl11 refractory compound nyob rau hauv aluminium alloy, uas plays lub luag hauj lwm nyob rau hauv refining nplej nyob rau hauv lub melting thiab casting txheej txheem, tab sis cov nyhuv yog me dua li ntawm titanium thiab zirconium. Vanadium kuj muaj cov nyhuv ntawm refining cov qauv recrystallization thiab ua kom lub recrystallization kub.
Cov khoom solubility ntawm calcium nyob rau hauv aluminium alloy yog tsawg heev, thiab nws tsim CaAl4 compound nrog txhuas. Calcium kuj yog ib qho superplastic ntawm aluminium alloy. Aluminium alloy nrog txog 5% calcium thiab 5% manganese muaj superplasticity. Calcium thiab silicon daim ntawv CaSi, uas yog insoluble nyob rau hauv txhuas. Txij li thaum tus nqi ntawm cov khoom siv ntawm silicon raug txo, cov conductivity ntawm industrial ntshiab txhuas tuaj yeem txhim kho me ntsis. Calcium tuaj yeem txhim kho kev ua haujlwm ntawm aluminium alloy. CaSi2 tsis tuaj yeem ntxiv dag zog rau kev kho cua sov ntawm aluminium alloy. Cov calcium uas muaj txiaj ntsig zoo tshem tawm cov hydrogen hauv molten aluminium.
Lead, tin, thiab bismuth cov ntsiab lus yog cov hlau uas tsis tshua muaj melting. Lawv muaj me ntsis solubility nyob rau hauv txhuas, uas me ntsis txo lub zog ntawm cov alloy, tab sis tuaj yeem txhim kho qhov kev ua tau zoo. Bismuth nthuav thaum lub sij hawm solidification, uas muaj txiaj ntsig zoo rau kev pub mis. Ntxiv bismuth rau siab magnesium alloys tuaj yeem tiv thaiv "sodium brittleness".
Antimony feem ntau yog siv los ua kev hloov kho hauv cam khwb cia txhuas alloys, thiab tsis tshua siv nyob rau hauv wrought aluminium alloys. Tsuas yog hloov bismuth hauv Al-Mg wrought aluminium alloys los tiv thaiv sodium embrittlement. Thaum cov khoom antimony ntxiv rau qee qhov Al-Zn-Mg-Cu alloys, kev ua haujlwm ntawm kub nias thiab txias nias tuaj yeem txhim kho.
Beryllium tuaj yeem txhim kho cov qauv ntawm oxide zaj duab xis nyob rau hauv wrought aluminium alloy thiab txo qhov kub hnyiab thiab suav nrog thaum casting. Beryllium yog ib qho tshuaj lom uas tuaj yeem ua rau muaj kev tsis haum tshuaj lom. Yog li ntawd, aluminium alloys uas tuaj rau hauv kev sib cuag nrog cov zaub mov thiab dej haus yuav tsis muaj beryllium. Cov ntsiab lus ntawm beryllium hauv cov khoom siv vuam feem ntau yog tswj qis dua 8μg / ml. Aluminium alloy siv los ua lub hauv paus vuam yuav tsum tswj cov ntsiab lus ntawm beryllium.
Sodium yog yuav luag insoluble nyob rau hauv txhuas, lub siab tshaj plaws khoom solubility yog tsawg tshaj li 0.0025%, thiab lub melting point ntawm sodium yog tsawg (97.8 ° C). Thaum sodium muaj nyob rau hauv cov hlau, nws yog adsorbed rau saum npoo ntawm dendrites los yog grain ciam thaum lub sij hawm solidification. Thaum lub sij hawm thermal ua, sodium nyob rau hauv ciam teb ntawm grain tsim ib cov kua adsorption txheej, thiab thaum brittle cracking tshwm sim, NaAlSi compound yog tsim, tsis muaj sodium dawb, thiab "sodium brittleness" tsis tshwm sim. Thaum cov ntsiab lus magnesium ntau tshaj 2%, magnesium yuav siv silicon thiab precipitate dawb sodium, ua rau "sodium embrittlement". Yog li ntawd, high-magnesium aluminium alloys tsis raug tso cai siv sodium ntsev fluxes. Txoj kev los tiv thaiv "sodium embrittlement" yog txoj kev chlorination, uas ua rau sodium daim ntawv NaCl thiab tso tawm mus rau hauv lub slag, thiab ntxiv bismuth los ua nws daim ntawv Na2Bi thiab nkag mus rau hauv cov hlau matrix; ntxiv antimony rau daim ntawv Na3Sb lossis ntxiv lub ntiaj teb tsis tshua muaj peev xwm kuj ua si tib lub luag haujlwm.
Kho los ntawm May Jiang los ntawm MAT Aluminium
Post lub sij hawm: Nov-11-2023
