Nichrome kauv: zog thiab daim ntawv thov

Niaj hnub nimno lub neej yog tsis yooj yim sua xav txog tej yam tsis muaj ib tug lossis loj tus naj npawb ntawm ntau cov khoom siv. Rau ntau ntawm lawv Nichrome kauv yog qhov tseem ceeb - "lub plawv" ntawm lub mechanism. Rau hluav taws xob khoom, tshuab cov cuab yeej, lub hwj chim cov cuab yeej siv nyob rau hauv lub neej txhua hnub thiab nyob rau hauv lub loj-scale lawm, yog ncaj qha nyob rau hauv lub hlau nrog cov thawj hlau.

piav qhia

Nyob rau hauv 1905, American tus paub txog Albert Marsh coined muab chromium thiab npib tsib xee. Cov patented mis raws li nram no 20% chromium thiab 80% npib tsib xee. Cov hlau twb muaj npe - nichrome. Chiv, muaj tsis muaj nyuam (refractory ntsiab) nyob rau hauv lub sib tov thiab nws yog ib tug ob-feem hlau. Niaj hnub no nws tseem tau los nrhiav variants nrog ib tug npib tsib xee cov ntsiab lus ntawm 55% thiab chromium 15%. Impurities yog hlau, pob zeb ntais, manganese, txhuas, titanium, molybdenum, pob zeb ntais. Muaj ntau tshaj li kaum "zaub mov txawv" hlau lub caij nplooj zeeg nyob rau hauv txoj kev xaiv nichrome.

Nichrome kauv muaj ib tug tsis tshua muaj high resistivity tau ua ib tug indispensable tivthaiv ntawm ntau cov cuab yeej thiab seev. Nws muaj peev xwm sawv ntawm tiv kub oxidation nyob rau hauv cov qub thiab nyob rau hauv corrosive tej kev kawm. Qhov no alloy muaj ib tug vim lub xub ntiag ntawm chromium, uas ua rau ntawm qhov chaw ntawm tsab xov xwm ib tug tiv oxide zaj duab xis. Nws pleev xim rau alloy nyob rau hauv ib tug maub xim. Yog hais tias koj tshem tawm (los ntawm cov neeg kho tshuab txiav txim) oxidized txheej, zas hloov mus rau ib tug whitish grey.

Y binary hlau tsis muaj sib nqus, multicomponent kev hloov kho tej zaum yuav attenuated tsis. Nichrome kauv yog rugged thiab zoo ductility. Hlau yog manufactured nrog ib tug txawv seem ntawm 0.01 mus rau 10 hli. Ntsiab nta xws li:

• hluav taws xob resistivity - OM`m 1100-1400;
• melting point rau 1400 degrees (ua hauj lwm ntau yam - 800-1100 degrees Celsius);
• ceev - 8200-8500 kg / m ^3;
• lub dag lub zog - 650-700 MPa.

Khoom zog raws li lub siab tshaj plaws hauj yuav tsum.

zoo

Siab thiab muaj zog thov rau lub Cheebtsam ntawm Nichrome hlau yog vim lub amazing zoo:

• tsis raug mus rau xeb;
• tsawg luj;
• yooj yim rau cov txheej txheem (yooj yim stamped thiab welded);
• Nws muaj high tshav kub tsis kam;
• check thiab saj zawg zog nyob rau tib lub sij hawm;
• yus muaj los ntawm ntau zog kuj mus txhoj puab heev kev kawm;
• Nws muaj ib tug ntev kev pab cuam lub neej.

Ib qho tseem ceeb kom zoo dua yog lub siab kuj yuav hluav taws xob tam sim no. Nyob rau hauv kev xyaum, qhov no parameter pub rau tsawg Nichrome (Nichrome kauv luv luv ntev) yuav tau txais ntau kub tshaj los ntawm, piv txwv li, cov hlau neeg. Nyob rau hauv lem, ib tug me me npaum li cas ntawm cov hlau yuav txo tau qhov nyhav thiab qhov luaj li cas ntawm tag nrho cov apparatus. Lub ntsiab kom zoo dua ntawm nichrome - ib tug ua ke ntawm tag nrho cov kev ntsuas nyob rau hauv tib cov ntaub ntawv uas.

hom

Nichrome kauv yuav ua los ntawm ntau yam kev hloov kho ntawm lub alloy thiab yuav sib txawv ntawm cov thickness. Nyiaj Muas yog txawv nyob rau hauv lawv cov muaj pes tsawg leeg thiab raug muab faib (conditionally) rau hauv peb lub ntsiab pawg:

• Resistor: H20N80 (20% chromium, 80% npib tsib xee); H20N73YUM-VI (20% chromium, 73% npib tsib xee, 3% txhuas, 1.5% molybdenum, mus txog 0.3% manganese, mus txog 0.05% titanium, 2% hlau, mus txog 0.05% carbon , melted lub tshuab nqus tsev induction txujci).
• Rau siv thaum kub saum toj no 900 degrees.
• Rau cua sov ntsiab nrog nce kuj rau siab kub: HN70YU-H (27% chromium, 70% npib tsib xee, 3% txhuas, mus txog 0.3% manganese, mus txog 0.03% ntawm cesium, thiab 0.1% ntawm barium thiab 1, 5% hlau, mus txog 0.1% carbon).

Nyob rau proportions ntawm nws constituent Cheebtsam, thaj chaw ntawm lub alloy nyob ntawm seb. Ib tug loj tus naj npawb ntawm chromium tiv thaiv oxidation.

Scope

Ntawm cov feem ntau sought tom qab nichrome hlau cov ntaub ntawv uas hais txog hluav taws xob khoom ua lag luam. Helix ntawm no hlau yog siv nyob rau hauv ntau cov qauv ntawm hluav taws xob tso cua sov. craftsmen siv nws nyob rau hauv tsev rau:

• apparatus hlawv ntoo;
• qhob furnaces rau firing ceramics;
• ceev cua kub pab kiag li lawm ntawm tej yam co nyob rau hauv lub smithy;
• ua cua sov nyuaj designs ( "tshis");
• qhob welders.

Cov muaj kev siv ntawm npib tsib xee chromium nyob rau hauv tsev neeg cov khoom siv lug: cov plaub hau dryers, irons, cua sov, soldering irons, fais fab thiab thiaj li nyob. Hlau nrog ib tug loj tus ntoo khaub lig-section yog siv rau tsis siv neeg vuam daim ntaub ntawv. Xws li ib tug hlau muaj peev xwm yuav nrhiav tau nyob rau hauv laboratory cov khoom thiab hluav taws xob field. Nichrome hlau yog siv qhov twg yuav tsum tau kuj rau siab kub thiab corrosive tej kev kawm.