Lub cev thaj chaw ntawm cov hlau

Nyob rau ib lub sij hawm thaum noob neej tau kawm kom tau co ntawm cov ore thiab txheej txheem nws pib ib tug tshiab puag ncig ntawm kev siv technology tshiab kev kawm, uas yog tseem mus tsis tu ncua. Yog hais tias ua ntej lub yas rov qab nyob rau hauv 1835 qhov yooj yim cov khoom ruaj ruaj uas muaj rau cov neeg yog ib tug hlau thiab ntoo, tam sim no ntxiv rau daim ntawv teev cov yas. Cuaj kaum, nws yog tsis yooj yim sua xav txog tej yam ib thaj chaw uas nws twb tsis tau siv hlau thiab lawv cov alloys. Nws yuav tau hais tias cov kev kawm nyob rau hauv nws cov tam sim no daim ntawv twb ua tau ua tsaug rau lawv.

Nws yog ib heev ntshiab tias lub cev thiab tshuaj thaj chaw ntawm hlau muaj tau zoo heev kawm. Tam sim no nrog cov ntsiab sawv daws yuav txhua leej txhua tus paub. Nyob rau hauv daim ntawv no, peb yuav sib tham txog cov kev lub cev thaj chaw ntawm hlau. Txawm li cas los, nyob rau hauv thiaj li tsis mus confuse lub ob nqe lus, yog ib tug luv luv daim ntawv teev cov zoo li cas xyov yog meant by tshuaj zog.

Ua ntej ntawm tag nrho cov, cov muaj peev xwm ntawm cov hlau mus nrog gases, dej thiab lwm yam tshuaj. Qhov no tej zaum kuj muaj xws li solubility. Tag nrho cov no txiav txim seb tus oxidation, corrosion kuj thiab thiaj li nyob.

Lub cev thaj chaw ntawm co uas muaj tuaj conductivity, ceev, permeability, tej thaum tshav kub kub, thiab coloration, moldability thiab lwm tus. Cov tag nrho yog heev loj, yog li yuav tsum rho ntawm no. Peb sau tsuas yog tus yooj yim lub cev thaj chaw ntawm hlau.

Xav txog tej yam muaj teeb meem: lub caij ntuj no, txias. Ob tug tej sab nraum - ntoo thiab hlau. Uas yog ib tug txias? Txawm tias ib tug me nyuam paub hais tias hlau. Txawm li cas los, cov huab cua kub yog tib yam, li no lub sij hawm "khaub thuas" yog tsis muaj feem xyuam no. Dab tsi ua rau cov kev xav ntawm txias? Lub cev thaj chaw ntawm hlau. Nyob rau hauv kev, thermal conductivity thiab tshav kub muaj peev xwm. Vim lub peculiar qauv ntawm cov atomic siv lead ua ntxaij ntoo, hlau sai npaum li cas haus thermal zog, nyob rau lub sov-uniformly. Qhov no feature tso cai yooj yim kev twb kev txuas los ntawm vuam lossis soldering.

Nws yog lub npe hu hais tias lub melting ntawm ib co co xav tau siab kub, thaum lwm tus neeg yuav cia li yaj nyob rau hauv lawv txhais tes. Piv txwv li, cov hlau sodium kis rau hauv cov kua daim ntawv twb nyob rau ntawm 100 degrees (ib tug me ntsis tsawg), li ntawd, cov kev xav metallurgist yuav ua tau leej twg. Nws rov qab - tungsten (manufactured therefrom nyob rau hauv filament teeb), uas melts nyob rau hauv 3400 degrees.

Ntawm cov hoob kawm, lub cev thaj chaw ntawm cov hlau tsis xaus muaj. Xav txog tej yam uas koj yuav tau ua kom tau thiab nruab ib tug hlau qhov rooj. Yog li qhov ntev tsis muaj tus "cia" yuav ua rau lub fact tias cov kub lub sij hawm ntawm lub xyoo vim yog lub linear thermal expansion ntawm lub qhov rooj yuav raug kaw (los yog qhib) yog tsis tau. Raws li, nrog ib tug txo nyob rau hauv kub cov khoom ntev me ntsis txo los ntawm qhov zoo tshaj yuav F. Tag nrho cov yam tseem ceeb yuav tsum tau suav hais tias.

Co muaj zoo tseem ceeb rau qhov hluav taws xob khoom. Ntawm cov neeg tua yuav luag txhua yam: los ntawm tus neeg xyuas pib mus rau lub Certificate ntawm hluav taws xob khoom. Rau ntau lawm siv nyob ntawm tej ntawm tooj liab thiab txhuas, vim lawv muaj qhov tsawg kam mus rau lub tso cai ntawm lub them hais. Nws yog ib nqi sau cia hais tias qhov zoo tshaj plaws nta nyob rau hauv cov nyiaj thiab kub, tab sis vim lub high nqi ntawm cov co yog siv no xwb. Interconnected vaj tse - yog qhov hluav taws xob kuj. Vim hais tias cov ntaub ntawv no yog manufactured cua kub coils, filament, thiab lwm yam neeg sawv cev ntawm no pab pawg neeg ntawm cov hlau -. Yog tungsten, nichrome (hlau).

Ib tug ntawm cov tseem ceeb tshaj plaws cov ntsiab ntawm cov circuits - qhov no inductor. Txaus kom nws ib tug tub ntxhais ntawm mos magnetic khoom, xws li lag luam radically hloov. Qhov no yog vim lub magnetization ntawm cov hlau.

Tau nyob rau hauv cov khoom rau yam ntxwv yuav tsuas yuav cov ntaub ntawv yog tias koj paub lub cev thaj chaw ntawm cov hlau siv.