Cov khoom muaj pes tsawg leeg sib txawv
Cobalt-based alloys siv cobalt (Co), chromium (Cr), molybdenum (Mo), thiab lwm yam raws li cov ntsiab lus tseem ceeb, uas cobalt tso nyiaj ntau dua, thiab qee yam ntawm cov hlau (Fe), carbon (C) thiab lwm cov ntsiab lus ntxiv; nickel-based Cov alloy siv npib tsib xee (Ni) ua lub ntsiab tseem ceeb, thiab tseem ntxiv chromium (Cr), molybdenum (Mo), tooj liab (Cu), titanium (Ti), niobium (Nb) thiab lwm yam khoom.
Processability sib txawv
Cobalt-based alloys muaj kev ua haujlwm zoo hardening thiab annealing softening zog, thiab yooj yim rau kev ua tiav rau hauv ntau yam duab. Lawv tsim nyog rau machining qhov chaw siv cobalt-based alloys. Nickel-raws li alloys muaj kev ua tau zoo thiab yooj yim rau forge, extrusion thiab rotor txoj kev ua, thiab tsim nyog rau machining qhov chaw. Kev txhim kho thiab txhim kho cov tshuab hluav taws xob ceev ceev siv cov nickel-based alloys.
1. Kev kho cua sov: Ob qhov kub-kub alloys xav tau kev kho cua sov. Lawv ob leeg tau txais kev kho cua sov ntawm cov khoom siv kho mob + kev laus kev kho mob. Qhov nyuaj ntawm cov txheej txheem kev kho cua sov yog tib yam.
2. Weldability: Ob leeg kub-kub alloys muaj zoo weldability. Thaum txhuam foob vuam, cua sov yog ib qho yooj yim mus sau thiab ua rau deformation. Nws raug nquahu kom siv cov khoom siv cobalt, uas muaj cov thermal conductivity, muaj zog thermal conductivity, me me expansion coefficient, thiab me me deformation. , qhov vuam fusion zog yog zoo dua.
3.Tig ua haujlwm: Txaus siab xa tuaj yeem ua tiav.
Ob leeg high-temperature alloys muaj kev ua tau zoo.
Kev ua tau zoo sib txawv
1. Corrosion kuj:
Cobalt-raws li alloys muaj zoo heev hnav tsis kam, corrosion kuj thiab siab kub zog, thiab muaj peev xwm tswj tau ruaj khov nyob rau hauv huab ib puag ncig xws li muaj zog acid, muaj zog alkali, siab kub thiab siab siab, thiab yog haum rau manufacturing qhov chaw uas yuav tsum tau tiv taus siab loads thiab huab ib puag ncig;
Nickel-based alloys muaj kev tiv thaiv corrosion zoo thiab tuaj yeem tswj kev ruaj ntseg thiab kev ncaj ncees nyob rau hauv ntau yam corrosive media. Lawv kuj muaj cov khoom kub-kub zoo heev thiab tuaj yeem tswj tau lub zog siab thiab toughness nyob rau hauv high-temperature ib puag ncig. Tab sis nws tsis haum rau corrosive acidified media.
2.Thermal stability: Cobalt-based alloys muaj cov khoom kub zoo dua li cov nickel-based alloys thiab tuaj yeem siv rau qhov kub siab tshaj 1200 ° C rau lub sijhawm ntev, thaum cov nickel-based alloys feem ntau tsuas yog siv nyob ib ncig ntawm 1000 ° C. Cobalt-based alloys muaj cov ntsiab lus melting ntau dua thiab thermal conductivity, me me thermal expansion tom qab cua sov, thiab muaj qhov zoo ntawm thermal stability; Nickel-raws li alloys muaj kev tiv thaiv zoo rau oxidation thiab corrosion, tab sis nyob rau hauv high-temperature ib puag ncig, cobalt lub hauv paus alloy muaj zoo dua kub-kub oxidation kuj thiab high-temperature corrosion kuj.
3.Mechanical zog: Cobalt-raws li alloys muaj zoo heev kub-kub lub zog thiab zoo thermal qaug zog tsis kam, thaum npib tsib xee-raws li alloys muaj zoo ductility thiab processability, tab sis lawv high-temperature zog thiab thermal qaug zog kuj me ntsis inferior rau cobalt-raws li alloys. . Nyob rau hauv chav tsev kub, lub zog ntawm cobalt-raws li alloys yog me ntsis qis, tab sis lub elongation yog ntau dua; nickel-raws li alloys muaj zog dua, tab sis nkig ntau dua, thiab yuav tsum tau siv ceev faj nyob rau hauv qhov chaw uas muaj kev cuam tshuam. Thaum qhov kub thiab txias, thaum qhov kub yog 650 ° C, cov nickel-raws li alloys muaj zog dua, tab sis kuj yog nkig ntau dua, thiab nws yuav ua rau tawg thaum siv rau cov xwm txheej cuam tshuam. Thaum qhov kub nce mus txog 900 ° C, cov nickel-based superalloy tsis tuaj yeem siv tau lawm, thaum lub pob zeb diamond-based superalloy tseem muaj qee lub zog.
4.Mechanical hardness: Qhov hu ua txhav yog lub peev xwm ntawm cov khoom siv los tiv thaiv deformation. Lub zog ntawm nickel-based alloys yog qis dua li ntawm cobalt-based alloys hauv txhua qhov kub thiab txias.
Uneeg txawj ntse
Cobalt-raws li alloys feem ntau yog siv los tsim ntau yam khoom thiab cov khoom nyob rau hauv hnav-resistant, corrosion-resistant, high-temperature thiab impact-resistant ua hauj lwm tej yam kev mob; nickel-raws li alloys yog dav siv nyob rau hauv aviation, aerospace, zog, marine, ib puag ncig tiv thaiv thiab lwm yam teb, tshwj xeeb tshaj yog cov zus tau tej cov yam tseem ceeb xws li turbine hniav thiab combustion chambers nyob rau hauv aero engines.
