I. Khoov (deformation, sagging)
Yog vim li cas:
1.High -kub creep:
Ntev - siv lub sijhawm kub dhau: Qhov no yog qhov laj thawj tseem ceeb. Thaum siv ntawm qhov kub thiab txias tshaj nws qhov siab tshaj plaws (xws li 1600℃hom silicon carbide pas nrig siv rau lub sijhawm ntev ntawm qhov kub siab tshaj 1650 degree), silicon carbide pas nrig yuav raug siab - kub nkag thiab maj mam sag thiab khoov nyob rau hauv lub zog ntawm lub ntiajteb txawj nqus.
2.Qhov chaw thau khoom (lub zog ntom ntom) yog tsim los siab dhau: qhov no ua rau qhov ua haujlwm kub ntawm tus pas nrig ntau dua li qhov ntsuas kub hauv qhov cub.
3. Kev teeb tsa tsis raug:
The horizontally installed rod is too long or not properly supported: For horizontally installed rods that are excessively long (e.g., >1.5 meters), lawv tsis muaj kev txhawb nqa hauv nruab nrab thiab sag vim lawv tus kheej qhov hnyav hauv qhov kub thiab txias.
Ib qho kawg yog tsau, thaum lwm qhov kawg tsis tuaj yeem swb dawb: thermal expansion yog hindered, ua rau khoov.
4. Tsis sib xws cua sov:
Qhov kub thiab txias nyob rau hauv lub cub tawg chamber yog hnyav heev tsis sib xws, ua rau kom kub siab nyob rau hauv ib sab ntawm bar piv rau lwm yam, ua rau asymmetric expansion los yog creep.
Cov lus qhia rau kev txhim kho:
1.Kev ua haujlwm ntawm qhov kub thiab txias ntau dhau yog txwv nruj:
Xyuas kom meej tias "nto load" thaum lub sij hawm tsim thiab siv nyob rau hauv ib tug tsim nyog ntau yam (saib rau cov khoom phau ntawv).
Kev tswj qhov kub ntawm lub cub tawg yuav tsum yog qhov tseeb, thiab cov thermocouple yuav tsum tau ntsuas tsis tu ncua.
2.Optimize installation tsim:
Rau cov kab kab rov tav ntev, cov qauv "txhawb nqa" yuav tsum tau tsim rau ntawm lub qhov cub kom tiv thaiv sagging nyob rau hauv nruab nrab.
Xyuas kom meej tias cov qauv kev teeb tsa pub dawb axial nthuav dav ntawm lub cev pas nrig.
3. Txhim kho qhov sib txawv ntawm qhov kub thiab txias hauv qhov cub: Npaj cov cua sov thiab cov thermocouples kom tsim nyog los xyuas kom meej cov cua ntws zoo hauv lub cub tawg chamber thiab tsis txhob muaj cua sov hauv zos.
II. Cov cua kub tsis sib xws (qhov kub sib txawv ntawm qhov chaw, qhov kub ntawm lub zos lossis qhov tsaus ntuj ntau dhau)
Yog vim li cas:
1.Resistance matching teeb meem (lub ntsiab yog vim li cas):
Nyob rau hauv ib qho kev sib piv nrog cov kev sib txawv tseem ceeb, lub bar nrog qis tsis kam sib koom ntau dua tam sim no, ua rau muaj zog dua thiab kub siab (overheating), thiab kev laus dua.
2.Circuit kev twb kev txuas teeb meem:
Loose, oxidized, los yog tsis zoo hu xov tooj clamps ua rau ib tug txo nyob rau hauv qhov tseeb voltage ntawm tus pas nrig, ua rau tsis txaus cua sov (dimming).
Tsis txaus busbar lossis cable specifications ua rau qhov sib txawv voltage poob hauv Circuit Court.
3.Uneven cub tawg ib puag ncig:
Atmospheric cawv: Kev sib cuag nrog txo cov huab cua los yog corrosive gases nyob rau hauv tej qhov chaw ua rau kom oxidation sai, muaj zog tiv thaiv, thiab txo tshav kub nyob rau hauv lub cheeb tsam.
4.Qhov tsis sib xws thaum tshav kub kub dissipation: Nyob rau hauv cov cheeb tsam ze ntawm qhov cub qhov rooj, qhov chaw soj ntsuam, los yog qhov chaw tshav kub dissipation yog ceev, tus pas nrig lub cev yuav tsum tau tso tawm ntau cua sov kom lub cub tawg kub, ua kom nws zoo li brighter.
5.Shielding effect: Cov pas nrig yog ib feem ntawm cov khoom tiv thaiv, cov khoom ua haujlwm, lossis cov khoom sib txuam hauv lub cub tawg, ua rau cov cua sov tsis zoo thiab kub siab dua ntawm qhov chaw tiv thaiv.
6.Inconsistent aging ntawm tus pas nrig lub cev nws tus kheej:
Vim yog cov laj thawj uas tau hais los saum no, qee cov roj rods muaj kev laus thaum ntxov (tsis kam nce), ua rau muaj kev tsis txaus ntseeg ntxiv hauv kev faib hluav taws xob ntawm cov pas nrig hauv tib pab pawg.
Cov lus qhia rau kev txhim kho:
1.Strict resistance grouping thiab pairing:
Ua ntej kev teeb tsa, ntsuas qhov txias tsis kam ntawm txhua tus pas nrig ib leeg. Cov pas nrig nrog cov txiaj ntsig zoo sib xws (xws li ± 3%) ua ke siv rau tib lub voj voog sib luag.
2.Ua kom zoo hluav taws xob sib txuas:
Siv cov khoom tsim nyog (xws li txhuas) hlau clamps, tu cov oxides tsis tu ncua, thiab ceev lawv.
Tsim ib qho qis -impedance, symmetrical fais fab mov kab los xyuas kom meej tias qhov voltage ntawm txhua tus pas nrig yog qhov sib npaug.
3.Optimize rauv tsim thiab txheej txheem:
Cov cua nkag thiab qhov hluav taws xob tso tawm yuav tsum tau npaj kom tsim nyog los xyuas kom muaj huab cua nyob hauv qhov cub.
4. Kho cov txheej txheem thauj khoom kom tsis txhob muaj qhov sib npaug ntawm cov cua sov.
Nyob rau hauv cov cheeb tsam uas muaj cua sov dissipation, xws li lub qhov rooj rauv, nws yog ib advisable mus densify qhov kev npaj ntawm rods los yog siv rods nrog ntau zog.
5.Ua raws li kev saib xyuas thiab kev sib hloov:
Tsis tu ncua xyuas qhov kub ntawm qhov chaw faib khoom cua sov ntawm txhua tus pas nrig siv lub ntsuas kub infrared.
Rau cov hluav taws xob furnaces nrog ntau- cheeb tsam tswj, thaum lub sij hawm tom qab theem ntawm kev laus (tom qab qhov kev tiv thaiv nce), cov pas nrig uas muaj zog tiv thaiv tuaj yeem tig los ntawm qhov siab - qhov kub thiab txias mus rau qhov qis - qhov kub thiab txias rau kev siv, txhawm rau ua kom lub neej ntev.
