Dab tsi yog qhov Thermal thiab Mechanical Properties ntawm Mica ua ib qho Insulator hauv Kev Siv Hluav Taws Xob?
Tso lus
Nyob rau hauv ntau lub tshav kub daim hlau muaj ib tug nyias flaky khoom uas insulates lub active cua sov caij los ntawm lub hauv paus hlau lub cev. Cov khoom siv no yog mica thiab nws yog ib qho tseem ceeb hauv qee qhov kev tsim hluav taws xob vim nws qhov sib xyaw ua ke ntawm hluav taws xob rwb thaiv tsev thiab kub kub stability. Paub txog cov thermal thiab mechanical qualities ntawm mica, engineers tuaj yeem xaiv cov khoom siv rwb thaiv tsev uas tsim nyog rau cov cua sov band, strip heaters, cartridge heaters thiab platen heating systems.
Mica mica yog dab tsi? Ib txwm tshwm sim Insulator Mica yog ib qho tshwm sim ntawm cov khoom siv silicate uas tawg mus rau hauv nyias, elastic, pob tshab los xij. Ob hom nrov tshaj plaws uas siv rau hauv kev siv hluav taws xob cua sov yog
Muscovite mica (potassium aluminium silicate) - Cov qib siab tshaj plaws, nrog cov khoom siv hluav taws xob zoo thiab thermal kuj.
Rephrase kab lus
Rov qab mus rau qhov qub kab lus
Luam kab lus
Synonyms
mica
cov mica
ib mica
cov mineral mica
ntxhia mica
quartz
nws
mica mus
ci ntsa iab mica
me me mica
mica cov
mica-zoo li
cov ntxhia
qhov no mineral
extraction ntawm mica
ceramic mica
mica-raws li
ntxhia
xim
pob zeb diamond
cov ntxhia
siv mica
minerals xws li mica
nyiaj mica
hlau mica
xim mica
ci ntsa iab
mica hais
ci ntsa iab
nws yog xim hlau
cov khoom
Phlogopite mica (magnesium aluminium silicate) - dielectric lub zog me ntsis qis, tab sis qhov ntsuas kub tsis tu ncua siab dua, ua hauj lwm hauv cov cua kub cua sov.
Mica yog mined thiab ua tiav rau hauv nplooj ntawv, zaj duab xis lossis ua rau hauv cov duab. Nws tuaj yeem raug txiav, pierced lossis molded nyob ib ncig ntawm cov khoom siv cua sov. Cov nplooj ntawv Mica yog ib txwm muaj thiab overlaid nrog cov xaim tsis kam, xws li nichrome lossis sib npaug, los ua cov khoom cua sov mica los ua ke rau cov cua sov.
Thermal Properties: Nruab nrab conductivity thiab kub tsis kam
Ib qho tseem ceeb ntawm mica yog nws lub peev xwm los tiv thaiv qhov kub thiab txias yam tsis muaj kev sib cais, tawm, lossis poob hluav taws xob insulating muaj peev xwm.
Qhov kub siab tshaj qhov kev pabcuam txuas ntxiv sib txawv rau ntau hom mica:
Muscovite Mica: 932-1112℃F (500-600 degree)
Phlogopite Mica: 700 txog 800℃(1292 txog 1472℃F)
Txawm tias luv luv rau qhov kub siab dua (piv txwv li 900-1000℃rau phlogopite) yog qhov xav tau, tab sis kev khiav hauj lwm dhau qhov kev txwv tsis tu ncua rau lub sij hawm ncua sij hawm ua rau kev poob qis ntawm cov neeg kho tshuab kev ncaj ncees thiab qis insulating tsis kam.
Mica muaj thermal conductivity ntawm 0.5 txog 0.7 W / m·K. Qhov no yog ntau dua li feem ntau cov polymer insulators (xws li PTFE ntawm 0.25 W / mK) tab sis tsawg dua ceramic insulators (xws li alumina ntawm 25-30 W / mK). Qhov nruab nrab conductivity tso cai rau cov cua sov ntws los ntawm cov hlau tsis kam los ntawm mica txheej rau hauv lub tshuab rhaub hlau, tsis tau muab hluav taws xob cais tawm.
Thermal expansion coefficient - Mica muaj txheej txheej siv lead ua thiab yog li nthuav anisotropically. Kev nthuav dav raws lub dav hlau ntawm cov nplooj ntawv yog qhov tseem ceeb, qhov nthuav dav transverse mus rau nplooj ntawv tsawg dua. Qhov no anisotropy feem ntau zoo yoog rau cov hlau cua sov hauv cov khoom siv zoo.
Cov Khoom Siv Hluav Taws Xob High Dielectric Strength High Insulation Resistance
Mica yog khoom plig rau nws lub zog dielectric siab. Rau mica tus nqi yog hais txog 20 kV / mm (kilovolt ib millimeter ntawm thickness). Qhov hluav taws xob tawg yog nyob rau hauv qhov kev txiav txim ntawm 4,000 volts rau ib daim ntawv mica standard ntawm 0.2 hli thickness, uas yog deb tshaj li cov khoom siv voltages ntawm 240 V los yog 480 V siv nyob rau hauv industrial heaters.
Volume resistivity yog tsis tshua muaj siab, feem ntau yog nyob rau hauv qhov kev txiav txim ntawm 10^13 mus rau 10^15 Ω·cm ntawm chav tsev kub, poob considerably ntawm kub dua tab sis tseem txaus rau feem ntau cua sov siv.
Lub dielectric tas li (tus txheeb ze permittivity) ntawm mica yog ntawm qhov kev txiav txim ntawm 6-8, thiab ruaj khov nyob rau ntau qhov ntau zaus thiab qhov kub thiab txias.
Mica kuj tseem siv los ua ib qho insulator rau cov xov hlau tiv thaiv kev ua haujlwm ntawm qhov kub thiab txias uas yuav yaj lossis carbonise polymer insulators. Mica muaj cov khoom hluav taws xob uas tsim nyog rau lub hom phiaj no.
Mechanical Properties: Flexibility, Brittle, rhiab rau cov dej noo
Cov nplooj ntawv nyias nyias (0.05-0.5 mm) yog hloov tau, tab sis cov nplooj ntawv tuab mica yog nkig. Cov khoom yuav khoov ib ncig ntawm nkhaus, tab sis ntse creases yuav ua rau nws tawg. Nyob rau hauv lub tshuab rhaub tsim mica yog feem ntau tuag-txiav rau cov ntaub ntawv pes tsawg nrog qhov rau lub davhlau ya nyob twg pins lossis cov qhov rau cov hlau tsis kam.
Lub zog tensile feem ntau yog tsawg thiab cov khoom tsis muaj zog shear. Mica yuav tsum tsis txhob siv los ua ib tus tswv cuab, tab sis yuav tsum tau muab kev txhawb nqa los ntawm cov cuab yeej siv hlau los yog cov phaj clamping.
Ib qho tsis zoo yog qhov nqus dej noo. Mica yog cov khoom siv hygroscopic. Kev nqus dej noo txo qhov kev tiv thaiv saum npoo thiab tuaj yeem ua rau hluav taws xob los yog luv luv. Yog li, cov cua sov mica tsis tsim nyog rau kev pabcuam raus dej, lossis cov av noo siab tshwj tsis yog kaw hermetically. Lub tshuab cua sov mica hauv kev siv yuav tsum tau "kib tawm" (thawj sov- mus txog lub voj voog) txhawm rau tshem tawm cov dej noo uas nqus tau raws li qhov kev nyeem ntawv qis qis tsis pom zoo.
Tsis zoo rau abrasion. Cov npoo ntawm cov hlau ntxhib tuaj yeem txhuam los yog hmoov mica nto. Kev sib dhos yuav tsum yog qhov zoo ntawm qhov deburred.
Mica, Ceramic thiab Polymer Insulators - Qhov txawv yog dab tsi?
Cov lus hauv qab no piv mica nrog rau lwm cov khoom siv hluav taws xob uas siv hluav taws xob rau cov khoom cua sov:
Mica (Muscovite) Ceramic (Alumina, Steatite) Polymer (PTFE, PEEK, Silicone)
Max. Nruam kub 500-600℃800-1200℃(alumina) PTFE: 260 degree; PEEK: 250 degree; Silicone kub: 200ºC
Thermal conductivity (W/mK) 0.5 - 0.7 25 - 30 (alumina) PTFE: 0.25; Silicone: 0.2-0.3
Dielectric zog (kV / mm) ~ 20 10 - 15 (alumina) PTFE: ~ 20, PEEK: ~ 20, Silicone: ~ 15
Flexibility nyob rau hauv cov ntawv nyias Mechanical flexibilityRigid, brittle Flexible (tshwj xeeb yog silicone)
Moisture resistance Tsawg (hygroscopic) Zoo heev (nonabsorbing) Zoo heev (dej{0}}repellent)
Cov khoom siv hluav taws xob ntau lub tshuab hluav taws xob, hluav taws xob hluav taws xob, cov khoom siv hluav taws xob hluav taws xob, cov khoom siv hluav taws xob hluav taws xob, hluav taws xob hluav taws xob, hluav taws xob hluav taws xob, hluav taws xob, hluav taws xob, hluav taws xob, hluav taws xob, hluav taws xob, hluav taws xob, hluav taws xob, hluav taws xob, hluav taws xob, hluav taws xob, hluav taws xob, hluav taws xob, hluav taws xob, hluav taws xob
Tus nqi txheeb ze Tsawg rau nruab nrab nruab nrab rau siab nruab nrab siab siab (PEEK)
Mica rwb thaiv tsev daim ntaub ntawv nyob rau hauv cov cua sov phaj
Mica feem ntau yog siv rau hauv kev tsim cov phaj cua sov.
Mica band warmers - Mica nyob rau hauv daim ntawv ntawm cov nplooj ntawv nkhaus yog qhwv nyob ib ncig ntawm ib tug cylindrical nto, nrog kuj hlau coiled tshaj lub mica thiab ib tug thib ob mica txheej nyob rau saum toj. Tag nrho cov qauv yog ruaj nyob rau hauv ib tug hlau band.
Mica Strip Heaters - Pav ca los yog nkhaus mica sib dhos siv rau cov cua sov platens, tuag thiab nias daim hlau.
Cartridge rhaub cores - Resistance wire yog twisted nyob rau hauv grooves ntawm ib tug ceramic core los yog mandrel, uas yog encased nyob rau hauv ib daim ntawv mica. Lub mica hluav taws xob insulates cov hlau los ntawm sab nraud hlau sheath.
Cua tso cua sov. Mica yog siv nyob rau hauv cov kav dej tso cua sov rau insulate qhib -coil kuj nyob ntawm qhov kub siab tshaj qhov txwv ntawm polymer rwb thaiv tsev.
Mica feem ntau yog siv nyob rau hauv qhov kub thiab txias tsim tsim thaum qhov kev khiav hauj lwm kub tshaj 200-260 C txwv ntawm PTFE los yog silicon, tab sis yuav tsum tau ib tug nyias, formable insulator. Tshaj 800 C, ceramic insulators (alumina lossis steatite) feem ntau yog siv, tab sis lawv tsis hloov pauv.
Kev xav txog kev tsim thiab kev txwv
Nws yog tsim nyog sau cia tias mica muaj ntau yam kev txwv uas yuav tsum tau coj mus rau hauv tus account nyob rau hauv lub rhaub tsim.
Moisture rhiab heev - Mica cov cua sov uas tau muab khaws cia rau hauv qhov chaw ntub dej yuav tsum "kib tawm" ntawm qhov kub qis (100-150 degree) rau ntau teev ua ntej siv lub zog tag nrho. Lub kaw lus kaw thiab encapsulation pab txo cov dej noo nkag.
Kev ntxhov siab nyob rau hauv cov neeg kho tshuab kev ntxhov siab - Mica cov ntawv tuaj yeem tawg yog tias lub tsev nyob hauv lub tshuab cua sov yog overtightened los yog thermal expansion imbalances ua rau compressive stresses. Pom zoo tshem tawm thiab caij nplooj ntoos hlav loaded clamping li.
Kev kub siab txo rwb thaiv tsev tiv thaiv - Mica tseem yog ib qho zoo heev insulator ntawm qhov kub thiab txias, tab sis nws qhov ntim resistivity qis dua los ntawm ntau qhov kev txiav txim ntawm qhov loj. Rau kev siv hluav taws xob ntau heev (hais tias, 1000 V +) ntau tshaj ib txheej ntawm mica lossis tuab mica yuav xav tau.
Tsis yog rau immersion - Mica yuav tsum tsis txhob nyob rau hauv kev sib cuag nrog cov kua. Dej nkag mus, thiab cov rwb thaiv tsev tsis tau sai, thiab hluav taws xob tawm. Immersion heaters yog tsim nrog magnesium oxide (MgO) hmoov lossis PTFE hloov.
Xaus: Ib lub sij hawm- kuaj cov insulator rau ntau qhov siab - kub cua sov phaj tsim
Mica muaj kev sib xyaw tshwj xeeb ntawm cov hluav taws xob kub kub rwb thaiv tsev nyob rau hauv ib daim ntawv nyias, formable. Mica tuaj yeem sau qhov sib txawv ntawm qhov kub thiab txias ntawm cov polymers thiab cov tawv nqaij kub kub, nrog kev pabcuam kub ntawm 500-600℃(muscovite) lossis 700-800℃(phlogopite), lub zog dielectric txog li 20 kV / mm thiab thermal conductivity ntawm 0.5-0.7 W / m·K.
Nws yog qhov tsim nyog rau cov khoom siv hluav taws xob, cov khoom siv hluav taws xob thiab cov khoom siv hluav taws xob uas siv tau yooj yim, nyias profile thiab kub tsis kam. Txawm li cas los xij, nws cov brittleness, noo noo nqus thiab tsis muaj peev xwm ua tau hauv qhov chaw ntub dej yuav tsum tau kov yeej los ntawm kev ua tib zoo tsim thiab siv. Kev xaiv ntawm cov khoom siv insulating yog ib qho tseem ceeb rau hluav taws xob kev nyab xeeb thiab thermal kev ua tau zoo thiab mica tseem yog ib qho pov thawj kev xaiv rau ntau hom kev lag luam cua sov phaj ua hauj lwm nyob rau hauv qhuav kub kub.
