Yuav ua li cas 316 Stainless Hlau Sheath Phab Ntsa Thickness cuam tshuam rau Dielectric Strength ntawm Magnesium Oxide Rwb thaiv tsev Tom qab Swaging hauv Hluav Taws Xob Hluav Taws Xob?

Rau cov engineers zoo thiab cov chaw tsim khoom cua sov, kev sib raug zoo ntawm cov phab ntsa thickness thiab hluav taws xob rwb thaiv tsev kev ua tau zoo tsis yog ib txwm muaj tseeb. Cov hmoov magnesium oxide nyob ib ncig ntawm cov hlau tsis muaj zog yog compressed rau qhov ntom ntom uas muab cov thermal conductivity thiab siab dielectric zog -feem ntau siab tshaj 2.8 g / cm³ kom muab cov rwb thaiv tsev tiv thaiv ntau tshaj 100 megohms ntawm chav tsev kub. Lub ntsiab mechanism rau compacting MgO yog cov txheej txheem swaging uas txo qis sab nraud ntawm 316 stainless hlau sheath. Tab sis lub radial siab exerted los ntawm lub sheath phab ntsa ntawm MgO nyob ntawm lub thickness ntawm phab ntsa. Cov phab ntsa tuab nqus ntau dua ntawm lub zog swaging. MgO tuaj yeem ua rau qis qis. Cov phab ntsa nyias nyias xa cov quab yuam ntau dua tab sis muaj kev pheej hmoo tawg lossis puas tsuaj rau cov hlau tsis kam. Daim ntawv no txheeb xyuas cov nyhuv ntawm 316 sheath phab ntsa thickness ntawm qhov ua tau MgO ntom thiab dielectric zog. Nws muab lub hauv paus rau kev txiav txim siab qhov tsawg kawg nkaus phab ntsa thickness uas sib npaug txhua yam kev ncaj ncees piv rau kev ua haujlwm hluav taws xob.

Compressive Cwj Pwm ntawm MgO thaum lub sij hawm Sheath Swaging
Hauv kev tsim khoom ntawm lub rhaub dej, lub raj ntawm 316 stainless hlau tau ntim nrog xoob sib xyaw ntawm MgO hmoov thiab cov xaim nyob hauv nruab nrab. Lub rooj sib txoos yog dhau los ntawm lub tshuab swaging uas spinning tuag rauj lub raj radially sab hauv thiab txo cov kab sab nraud los ntawm 10-30%. Cov txheej txheem no densifies MgO hmoov los ntawm qhov pib qhov ceev ntawm ~ 1.5 -1.8 g / cm3 mus rau qhov kawg ntom ntawm 2.8 -3.2 g / cm3. Lub net radial quab yuam los ntawm swaging tuag, tom qab rho tawm lub zog siv hauv elastic thiab yas deformation ntawm 316 sheath phab ntsa, yog lub compaction siab xa mus rau MgO. Rau qhov tshwj xeeb swaging txo thiab tuag quab yuam, cov phab ntsa thinner sheath ua rau kev ua haujlwm tsis zoo tag nrho ua tiav thiab feem pua ​​​​siab dua ntawm cov ntawv thov raug xa mus rau MgO. Kev ua qauv zoo kawg nkaus ntawm cov txheej txheem swaging qhia tau hais tias 0.8 hli 316 sheath hloov mus txog 85% ntawm kev tuag siab rau MgO thaum lub 1.6 hli sheath tsuas hloov 65% nyob rau hauv sib npaug swaging tej yam kev mob. Tsawg dua 50% ntawm cov ntaub ntawv thov raug xa mus los ntawm 2.5 hli sheath, qhov seem yog khaws cia raws li lub zog elastic zog hauv cov phab ntsa tuab, los yog tso tawm thaum tshav kub kub thaum lub sij hawm yas deformation. Qhov sib txawv no muaj kev cuam tshuam ncaj qha rau MgO ntom ntom.

Kev sib raug zoo ntawm phab ntsa thickness thiab MgO ntom
Cov kev sim tswj kev siv cov cuab yeej siv swaging zoo sib xws, cov txheej txheem tuag thiab txo qhov sib piv qhia qhov tseeb kev sib raug zoo ntawm 316 sheath phab ntsa thickness thiab kawg MgO ntom. Hom MgO qhov ntom ntom tau ua tiav rau lub hom phiaj kev hloov pauv ntawm 20% (xws li . 12.0 hli mus rau 9.6 hli txheej kab) yog: Qhov kawg MgO ntom ntawm 3.1-3.2 g / cm3 nrog 0.8 hli phab ntsa thickness ho tshaj qhov tsawg kawg nkaus tus qauv. Phab ntsa tuab yog 1.2 hli, qhov ceev yog 2.9-3.0 g / cm3, uas tseem siv tau rau ntau lub hom phiaj. Qhov ceev txo mus rau 2.7-2.8 g / cm3, uas yog nyob rau ntawm qhov tsawg kawg nkaus tso cai theem lossis qis dua nws, nrog phab ntsa thickness ntawm 1.6 hli. Qhov ntom ntawm cov khoom siv nrog phab ntsa thickness ntawm 2.0 hli yog 2.5-2.6 g / cm3, uas tsis txaus rau kev ntseeg tau hluav taws xob rwb thaiv tsev ntawm qhov kub siab. Tsawg dua 2.7 g / cm3, MgO muaj kev sib tshuam porosity uas ua rau kom muaj dej noo thiab cov xau tawm rau hluav taws xob tam sim no. Lub rwb thaiv tsev tsis kam ntawm 500℃MgO compacted rau 2.5 g / cm3 feem ntau 10 mus rau 100 npaug qis dua li ntawm MgO compacted mus rau 3.1 g / cm 3 . Lub zog dielectric (qhov txwv sab sauv ntawm cov hluav taws xob hluav taws xob lub rwb thaiv tsev tuaj yeem txhawb nqa yam tsis muaj kev puas tsuaj) los ntawm li 15 kV / mm2 ntawm ³ . g/cm³. Lub tshuab hluav taws xob dhau ntawm MgO txheej ntawm 240 V rhaub nrog cov kab hluav taws xob tiv thaiv 1.0 hli yog kwv yees li 2-3 kV / hli ntawm qhov ua haujlwm voltage. Qhov no muab cov paj zoo nkauj ntawm qhov siab MgO ntom tab sis yog marginal ntawm qhov ntom ntom uas me me tuaj yeem ua rau dielectric tawg.

Tswv yim txwv ntawm "Dielectric Integrity" ntawm Thick-Walled Sheaths
The typical swaging procedure may not provide the required MgO density for applications that require thick 316 sheaths (>1.6 hli) rau cov neeg kho tshuab lossis corrosion. Muaj peb qhov kev hloov kho ntau lawm uas tuaj yeem txo qhov quab yuam nqus ntawm phab ntsa tuab. Thawj thiab feem ntau cov txheej txheem yog los tsa qhov kev txo qis ntawm qhov sib piv . 30% txo los ntawm 12.0 hli mus rau 8.4 hli txheej kab uas hla xa cov radial stresses muaj zog rau MgO, ua tiav qhov ntom ntom zoo ib yam li cov phab ntsa nyias ntawm qhov txo qis, es tsis txhob 20% txo. Lub txim yog nce qhov kev puas tsuaj rau cov hlau tsis kam thiab siab dua residual tensions nyob rau hauv lub sheath. Qhov kev hloov thib ob yog kev siv ntau lub viav vias viav vias nrog ib ntus annealing. A reduction of 15% then annealing to ease sheath stresses, followed by a second 15% reduction, can provide high MgO density in thick-walled sheaths without exceeding the formability limits of the 316 tubing. Qhov thib peb hloov yog hloov MgO hmoov specification: Cov ntxhib, angular MgO hais tau yooj yim dua compacted dua cov hmoov zoo, kheej kheej. Ib qib siab MgO nrog kev tswj hwm qhov loj me tuaj yeem ua kom qhov ceev kawg ntawm 0.1-0.2 g / cm3 rau tib yam kev hloov pauv. Txhua qhov kev hloov kho no ntxiv rau tus nqi tsim khoom. Tab sis tus nqi yog tsim nyog rau cov xwm txheej uas cov phab ntsa tuab yog qhov yuav tsum tau ua.

Xaiv Matrix ntawm Phab Ntsa Thickness thiab MgO Qhov Ncauj rau Kev Txhim Kho Dielectric Kev Ua Haujlwm
Cov lus hauv qab no qhia tau hais tias tsim nyog ua ke ntawm 316 sheath phab ntsa thickness thiab kev tsim khoom kom tau txais qhov tsawg kawg nkaus MgO ntom ntawm 2.8 g / cm3 thiab dielectric zog tshaj 10 kV / mm nyob rau hauv chav tsev kub.

Yuav Tsum Tau Swaging Phab Ntsa Thickness 316 Pom Zoo Swaging Reduction Pom Zoo Tus naj npawb ntawm Swaging PassesAchievable MgO Qhov Kev Ntsuas Tshwj Xeeb
0.8 - 1.0 hli 15 - 20% Ib leeg dhau 3.0 - 3.2 g / cm³ Tus qauv qauv, tus nqi qis
1.0 – 1.2 mm 18 – 22% Ib qho dhau 2.9 – 3.1 g/cm³ Cov txheej txheem txheem tsim nyog 1.2 – 1.4 mm 20 – 25% Ib leeg lossis ob lub teeb hla 2.8 – 3.0 g/cm³ Paub meej nrog cov qauv kuaj pom zoo 1.4 – 1.6 mm 25 cm 25 – 23. Qhov ceev MgO qib tsim nyog
1.6 - 1.8 mm 28 - 32% Muab ob npaug rau 2.6 - 2.8 g / cm3 Marginal, yuav tsum tau kuaj xyuas
1.8 – 2.0 mm 30 – 35% Intermediate annealing double pass 2.5-2.7 g/cm³ Tsis pom zoo rau voltages tshaj 120V > 2.0 mm Tsis tau Tsis tau Hauv qab 2.5 g/cm³ Siv ib txoj kab uas hla me me los yog sib txawv alloy
Rau txhua lub rhaub nrog lub zog ua haujlwm ntau dua 250 VAC, qhov tsawg kawg nkaus tso cai MgO qhov ceev yuav tsum tau nce mus rau 3.0 g / cm3 uas txwv tsis pub tshaj 316 sheath phab ntsa thickness mus rau 1.2 hli tshwj tsis yog cov txheej txheem swaging tshwj xeeb raug siv. Hauv cov ntawv thov hluav taws xob siab tshaj 600 VAC - feem ntau pom hauv qee cov khoom lag luam thiab cov khoom siv mining - cov ntaub thaiv phab ntsa tuab yuav tsum tau khaws cia hauv qab 1.0 hli kom tswj tau lub zog dielectric los yog lub rhaub yuav tsum tau tsim nrog cov ntaub thaiv npog hlau, hauv av thiab cais los ntawm MgO rwb thaiv tsev.

Cov txheej txheem rau kev ntsuam xyuas thiab kev lees paub ntawm Kev Tswj Xyuas Zoo
Kev sib raug zoo theoretical ib leeg tsis yog tso siab rau vim qhov kev hloov pauv tau qhia los ntawm cov cuab yeej swaging, tus neeg teb xov tooj txheej txheem thiab cov tubing tolerances. Yog hais tias cov cua sov nrog cov phab ntsa thickness ntau dua 1.4 hli, engineers yuav tsum thov cov chaw tsim tshuaj paus muab kev ntsuas ntawm MgO ntom ntawm cov qauv tsim. Qhov no feem ntau yog ua los ntawm kev txiav ib feem ntawm lub rhaub thiab ntsuas qhov loj thiab ntim ntawm cov hmoov compacted. Qhov tsawg kawg nkaus ceev yuav tsum tau hais raws li qhov yuav tsum tau ua zoo ntawm 2.8 g / cm3 thiab tsis yog lub hom phiaj. Cov cua sov ua tiav yuav tsum tau sim rau lub zog dielectric. Qhov kev sim ib txwm yog 1,500 VAC ntxiv rau ob zaug qhov kev ua haujlwm voltage thov rau ib feeb ntawm cov hlau tsis kam thiab sheath. Qhov ntawd yog 1, 500 + 480=1,980 VAC rau lub rhaub 240 V. Thick{16}}walled sheaths nrog marginal MgO ntom feem ntau dhau qhov kev sim no ntawm qhov kub thiab txias, tab sis tsis yog thaum tshav kub kub ua haujlwm vim tias lub zog dielectric ntawm MgO txo qis nrog qhov kub thiab txias. Qhov zoo tshaj plaws validation yog li no tau los ntawm kev nug kub rwb thaiv tsev tiv thaiv kev ntsuam xyuas ntawm 500 degree. Kev rwb thaiv tsev kub ntawm cov cua sov ua haujlwm feem ntau tsis tsawg dua 1 megohm, txawm hais tias 10 megohm yog qhov tsim nyog rau lub neej ntev. Dielectric breakdown field tsis ua hauj lwm yog kim thiab feem ntau txaus ntshai. Qhov kev siv nyiaj ntxiv ntawm kev qhia cov ntaub nyias nyias, lossis kev siv zog ntau dua, kom ua tiav MgO ntom yog me me piv nrog tus nqi ntawm daim ntawv lees paub lossis phem dua, qhov tshwm sim ntawm hluav taws xob poob siab.