Lub cev muaj zog ntawm hluav taws xob cua sov alloys - hluav taws xob resistivity

Lub cev muaj zog ntawm hluav taws xob cua sov alloys - hluav taws xob resistivity

1, txhais ntawm hluav taws xob resistivity

Hluav taws xob resistivity, tseem hu ua kuj coefficient los yog tshwj xeeb kuj. Nws yog ib qho hluav taws xob parameter uas sawv cev rau qhov tsis kam ntawm tus neeg xyuas pib mus rau qhov kev nkag ntawm tam sim no. Kev sib raug zoo ntawm cov resistivity ntawm ib tug conductor thiab nws kuj yog raws li nram no:

R= ρ L/S

Ntawm lawv, qhov tsis kam ntawm R-conductor, Ω;

Qhov ntev ntawm L-conductor, m;

Hla ntu ntawm S-conductor, mm2;

ρ- Cov hluav taws xob resistivity ntawm tus neeg xyuas pib, μ Ω · m.

Hluav taws xob resistivity yog ib qho hluav taws xob tsis muaj kev ywj pheej ntawm geometric qhov ntev ntawm cov khoom siv hlau. Nws muaj feem xyuam rau nws cov tshuaj muaj pes tsawg leeg, cov qauv metallographic (xa mus rau cov khoom sib xyaw nrog cov khoom siv tib yam, cov qauv siv lead ua, thiab cov khoom siv lub cev hauv cov qauv hlau, suav nrog cov ntsiab lus ntawm cov khoom siv hlau, cov khoom siv hlau, thiab cov khoom ntshiab), thiab ua haujlwm kub. Nws yog ib qho tseem ceeb cov ntaub ntawv rau xam tus nqi kuj ntawm hluav taws xob cua sov alloy cov ntaub ntawv.

2, Cov yam ntxwv ntawm hluav taws xob resistivity ntawm hluav taws xob cua sov alloys

Ib qho ntawm cov yam ntxwv uas paub qhov txawv ntawm cov khoom siv hluav taws xob hluav taws xob los ntawm cov khoom siv hluav taws xob zoo tib yam yog tias lawv muaj qee qhov kev xav tau rau cov khoom siv hluav taws xob. Ordinary conductive cov ntaub ntawv cia siab kom muaj ib tug qis resistivity, thaum hluav taws xob cua sov alloy cov ntaub ntawv yuav tsum muaj txaus resistivity los xyuas kom meej tias cov tsim hluav taws xob cua sov ntsiab muaj siab hluav taws xob hloov dua siab tshiab tus nqi, compact qauv, ruaj khov fais fab kis, thiab lwm yam. Yog li ntawd, hluav taws xob resistivity ntawm hluav taws xob. cov khoom siv cua sov alloy yuav tsum muaj cov yam ntxwv hauv qab no.

(1) High resistivity nqi: hluav taws xob cua sov alloy cov ntaub ntawv yuav tsum xub muaj ib tug kuj siab resistivity. Hluav taws xob cua sov cov ntsiab lus ua los ntawm cov khoom siv hluav taws xob muaj zog muaj hluav taws xob hloov hluav taws xob siab; Lub ntim ntawm hluav taws xob cua sov ntsiab yog me me; Txuag cov ntaub ntawv alloy; Nws tuaj yeem ua tiav high-power thiab ceev cua sov. Nws yog ib qho tseem ceeb tshwj xeeb tshaj yog thaum tsim hluav taws xob cua sov rauv taws nrog kub, siab zog, thiab ntim me me.

Thaum tsim hluav taws xob cua sov cov ntsiab lus, lub hauv paus ntsiab lus yog xaiv cov ntaub ntawv alloy nrog cov hluav taws xob tiv taus siab rau cov ntsiab lus kub, thiab cov ntaub ntawv alloy nrog qis hluav taws xob tiv taus rau nruab nrab thiab qis kub.

(2) Cov hluav taws xob ruaj khov thaum siv: Cov hluav taws xob tiv thaiv hluav taws xob ntawm cov hluav taws xob cua sov yuav tsum nyob ruaj khov thaum siv. Qhov me me ntawm qhov kev hloov pauv ntawm qhov kev tiv thaiv, qhov me me ntawm qhov kev hloov pauv ntawm cov khoom tiv thaiv, thiab qhov me me ntawm qhov hloov ntawm lub zog cua sov, yog li ua kom cov cua sov zoo thiab ruaj khov.

Hluav taws xob cua sov alloys tuaj yeem ua rau muaj kev hloov pauv hauv hluav taws xob tiv thaiv ntawm qhov kub thiab txias vim muaj kev hloov pauv ntawm cov tshuaj lom neeg muaj pes tsawg leeg thiab nag lossis daus ntawm cov tebchaw raws li cov ciam teb lossis hauv cov nplej. Cov qauv metallographic ntawm nickel chromium thiab npib tsib xee chromium hlau alloys yog qhov ruaj khov ntawm qhov kub thiab txias, yog li ntawd, cov hluav taws xob tiv taus yog ruaj khov thaum siv mus ntev. Ntawm qhov tsis sib xws, kev ruaj ntseg ntawm cov hlau chromium aluminium alloys yog qhov tsis zoo, feem ntau yog vim qhov txo qis hauv cov ntsiab lus txhuas hauv cov hlau, uas ua rau muaj kev hloov pauv hauv hluav taws xob tiv thaiv.

(3) Zoo uniformity ntawm hluav taws xob resistivity: Lub uniformity ntawm hluav taws xob resistivity yog hais txog lub uniformity ntawm hluav taws xob resistivity los yog kuj tus nqi ib 'meter' rau txhua 'meter' thiab batch ntawm hluav taws xob cua sov alloy hlau los yog strips, nrog ib tug me me fluctuation ntau yam yog zoo dua. Lub uniformity ntawm hluav taws xob resistivity muaj feem xyuam rau ntau yam xws li alloy smelting, casting, kho cua sov, thiab ib tug luj ntawm hlau rods.

Cov hluav taws xob resistivity uniformity ntawm nickel chromium series thiab nickel chromium hlau series alloys yog zoo dua li ntawm cov hlau chromium aluminium series alloys. Lub txhuas nyob rau hauv lub tom kawg yog nquag mus rau segregation thaum smelting thiab casting (qhov tsis sib xws ntawm ntau yam khoom siv nyob rau hauv cov hlau thaum lub sij hawm crystallization yog hu ua segregation), ua rau ib tug txo nyob rau hauv alloy uniformity.

Lub uniformity ntawm hluav taws xob resistivity yog ib qho tseem ceeb tshwj xeeb rau cov xov hlau zoo thiab nyias strips. Vim tias lawv feem ntau yog siv los tsim hluav taws xob cua sov rau cov khoom siv hauv tsev ntau, qhov tsis sib xws hauv kev tiv thaiv tuaj yeem ua rau muaj qhov sib txawv ntawm lub zog ntawm txhua lub ntsiab lus.

(4) Qhov sib txawv ntawm kev tiv thaiv nrog qhov kub thiab txias yuav tsum yog me me: muaj kev sib raug zoo ntawm kev tiv thaiv thiab kub, uas tuaj yeem sawv cev los ntawm qhov kub thiab txias coefficient ntawm kev ua haujlwm. Qhov tsawg dua tus nqi ntawm qhov tsis kam kub coefficient ntawm cov khoom siv hluav taws xob cua sov zoo tagnrho, qhov zoo dua. Qhov me me ntawm qhov kub thiab txias coefficient ntawm qhov tsis kam, qhov me me ntawm qhov kev hloov ntawm kev ua hauj lwm thaum lub sij hawm cua sov txheej txheem, thiab qhov me me qhov hloov pauv tus nqi ntawm qhov tsis kam ntawm cov hluav taws xob cua sov, uas tuaj yeem ua tiav cov cua sov ruaj khov.

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