Kev txhim kho thiab tsim cov ntaub ntawv tsis sib xws ntawm cov khoom siv hlau nplaum yog qhov tseem ceeb ntawm cov ntaub ntawv nyuaj alloy tshiab. Hard alloy yog tsim los ntawm sintering cov refractory hlau carbides ntawm IV A, VA, thiab VI A pawg nyob rau hauv lub sij hawm lub sij hawm ntawm cov ntsiab lus (xws li tungsten carbide WC), thiab kev hloov hlau ntawm cov hlau (cobalt Co, npib tsib xee Ni, hlau Fe) raws li lub sijhawm sib txuas los ntawm kev lag luam hmoov metallurgy. Cov tungsten carbide saum toj no yog nonmagnetic, thaum Fe, Co, thiab Ni yog txhua yam sib nqus. Siv Ni raws li ib tug binder yog ib qho tsim nyog rau kev tsim cov hlau tsis muaj hlau.
Muaj cov hauv qab no rau kev tau txais WC Ni series nonmagnetic hard alloys: 1. nruj me ntsis tswj cov ntsiab lus carbon
Zoo li WC Co alloy, cov ntsiab lus carbon yog qhov tseem ceeb cuam tshuam rau cov khoom muaj peev xwm ntawm W hauv kev sib txuas ntawm WC Ni alloy. Ntawd yog, qhov qis dua cov ntsiab lus ntawm cov pa roj carbon monoxide theem nyob rau hauv cov hlau alloy, qhov ntau dua cov khoom muaj peev xwm ntawm W nyob rau hauv Ni bonding theem, nrog rau qhov sib txawv ntawm kwv yees li 10-31%. Thaum cov khoom tov ntawm W nyob rau hauv lub Ni bonded theem siab tshaj 17%, cov hlau yuav demagnetized. Qhov tseem ceeb ntawm txoj kev no yog kom tau txais cov hlau tsis muaj hlau nplaum los ntawm kev txo cov ntsiab lus carbon thiab ua kom cov khoom sib tov ntawm W hauv kev sib txuas ua ke. Hauv kev xyaum, WC hmoov nrog cov ntsiab lus carbon qis dua cov ntsiab lus ntawm cov ntsiab lus carbon feem ntau yog siv, lossis W hmoov ntxiv rau qhov sib tov kom ua tiav lub hom phiaj ntawm kev tsim cov pa roj carbon tsawg. Txawm li cas los xij, nws yog qhov nyuaj heev los tsim cov hlau tsis sib nqus los ntawm kev tswj cov ntsiab lus carbon.
2. Ntxiv chromium Cr, molybdenum Mo, tantalum Ta
Lub siab carbon WC-10% Ni (wt% los ntawm qhov hnyav) alloy nthuav tawm ferromagnetism ntawm chav tsev kub. Yog tias ntau tshaj 0.5% Cr, Mo, thiab 1% Ta tau ntxiv rau hauv daim ntawv hlau, cov pa roj carbon siab tuaj yeem hloov pauv ntawm ferromagnetism mus rau cov hlau nplaum tsis muaj hlau nplaum. Los ntawm kev ntxiv Cr, cov khoom sib nqus ntawm cov hlau yog ywj siab ntawm cov ntsiab lus carbon, thiab Cr yog qhov tshwm sim ntawm cov khoom siv loj hauv cov txheej txheem kev sib txuas ntawm cov hlau, xws li W. Cov alloy nrog Mo thiab Ta tuaj yeem hloov mus rau hauv ib qho. non-magnetic alloy ntawm cov ntsiab lus carbon. Vim tias cov tshuaj tsis muaj zog ntawm Mo thiab Ta nyob rau theem kev sib txuas, feem ntau ntawm lawv tsuas yog ntes cov pa roj carbon hauv WC los tsim cov carbides sib xws lossis carbide cov ntsiab lus. Raws li qhov tshwm sim, cov alloy muaj pes tsawg leeg hloov mus rau sab qis-carbon, uas ua rau muaj kev nce ntxiv hauv cov khoom sib tov ntawm W hauv cov txheej txheem sib txuas. Txoj kev ntxiv Mo thiab Ta yog kom tau txais cov hlau tsis sib nqus los ntawm kev txo cov ntsiab lus carbon. Txawm hais tias nws tsis yooj yim los tswj raws li kev ntxiv Cr, nws yooj yim dua los tswj cov ntsiab lus carbon dua li cov ntshiab WC-10% Ni alloy. Qhov ntau ntawm cov ntsiab lus carbon tau nthuav dav los ntawm 5.8-5.95% mus rau 5.8-6.05%.
Email:oiltools14@welongpost.com
Hu rau: Grace Ma
Post lub sij hawm: Oct-09-2023
