Sintered Hlau Powder Xaiv rau Kev Siv Siab Siab Lim

Thaum ua haujlwm pom cov tshuab nyob rau hauv cov kev xav tau, lub hauv paus ntawm kev ua tau zoo yog nyob rau hauv kev xaiv cov ntaub ntawv zoo. Siab - ib puag ncig siab tso cov kev xav tau tshwj xeeb ntawm cov khoom lim, yuav tsum tau ua tib zoo xav txog lub zog ntawm lub zog, kev tswj qhov porosity, thiab lub sijhawm ntev -. To taub li cassintered hlau hmoovCov yam ntxwv cuam tshuam rau kev ua haujlwm lim dej ua qhov tseem ceeb rau kev lag luam xws li kev tsim cov hydrogen mus rau petrochemical ua.

Cov khoom xaiv tau ua thaum lub sij hawm lim tsim ncaj qha cuam tshuam rau kev ua haujlwm kev nyab xeeb, kev saib xyuas lub sijhawm, thiab kev ua haujlwm tag nrho. Cov lus qhia dav dav no tshawb txog cov yam tseem ceeb uas cov kws tsim khoom thiab cov kws tshaj lij yuav tsum tau soj ntsuam thaum xaiv cov hmoov hlau sintered rau siab - cov ntawv thov hnyav.

 

Sintered hlau hmoov

1.Specification
Khoom npe: Sintered Hlau Hmoov
Internal Code: NAV-2-002
Hom Lub Npe: NAVI Titanium®
General Shapes: Round, disc, ntawv, raj, puag ncig, bar, cap los yog customization
Cov ntaub ntawv raw:
(1) Titanium --- 0A qib ntshiab hmoov
(2) Stainless hlau --- / SS304 / SS316 / SS316L thiab lwm yam.
(3) Nickel --- Nickel puag alloys / MONEL / INCONEL / Hastelloy (C22 / C276)
(4) Bronze --- 0A qib ntshiab hmoov
Advanced fields of NAVI: PEM, semiconductor & electronics, pharmaceuticals thiab lwm yam.
2. Kev yuav khoom qhia
(1) Txheej txheem
NAVI Titanium (txij li xyoo 2008) tuaj yeem ua raws li koj cov duab kos duab
(2) Qauv
Ua tau zoo, kev lag luam, siab zoo
Tsuas yog coj tus nqi pib ntawm cov pwm rau cov khoom siv, Sintering ua ke rau cov qauv txiav txim, Zero tsis tsim nyog
(3) Kev txhawb nqa technology
Kev tshaj lij ib qho -rau- ib qho kev pabcuam, txais tos hu rau peb

Yuav Ua Li Cas Sintered Hlau Powder raug xaiv rau siab -Nias lim?

Xaiv txoj cai sintered hlau hmoov rau siab - siab pom txhais tau tias saib ntau yam sib txawv uas cuam tshuam rau ob qho tib si nws ua haujlwm zoo li cas tam sim ntawd thiab yuav ua li cas ntseeg tau tias nws yuav nyob ntev. Ua ntej koj tuaj yeem xaiv, koj yuav tsum paub meej tias qhov kev ua haujlwm ntawm koj lub cev yuav ntsib.

Nkag siab txog Kev Ua Haujlwm Kev Ua Haujlwm thiab Kev Ntsuas Siab

Kev ntsuas rau siab tau tsim cov qauv rau kev xaiv cov khoom. Rau cov tshuab ua haujlwm siab tshaj 10 MPa, cov hmoov yuav tsum muaj cov khoom siv zoo nkauj uas ua rau cov duab muaj zog thaum lawv sintered. Cov duab ntawm cov hmoov hlau hmoov cuam tshuam li cas lawv lo ua ke thaum lub sij hawm sintering, uas nyob rau hauv lem cuam tshuam rau lub tiav lim caij lub zog compressive. Thaum nws los txog rau kev ntim ntim, cov hmoov kheej kheej kheej kheej feem ntau ua haujlwm zoo dua li cov ntaub ntawv tsis xwm yeem. Qhov no pab ua kom tus cwj pwm tsis zoo hauv kev ntxhov siab ntau dua.

Chemical compatibility ntxiv lwm txheej rau kev txiav txim siab. Thaum koj sib xyaw corrosive media nrog kev kub siab, koj tau txais cov xwm txheej nyuaj uas cov khoom tawg sai dua. High -purity titanium hmoov yog zoo heev ntawm kev tiv thaiv kev ntxhov siab corrosion tawg los ntawm chloride. Qhov no ua rau nws muaj txiaj ntsig zoo rau kev siv cov dej hiav txwv los yog cov tshuaj brine uas nyob rau hauv siab. Tus nqi ntawm cov pa oxygen hauv titanium hmoov cuam tshuam rau ob qho tib si nws lub peev xwm los tiv thaiv corrosion thiab nws cov khoom siv kho tshuab.

Ntsuam Xyuas Particle Loj Distribution

Cov qauv pore yooj yim ntawm sintered lim yog ua raws li qhov luaj li cas ntawm cov khoom sib kis. Cov kws tshaj lij tuaj yeem ua cov lim dej nrog cov khoom tshwj xeeb permeability thaum khaws cov qauv kev ncaj ncees thaum kev faib khoom ua tib zoo tswj. Coarser hmoov feem ntau ua rau cov khoom ntxeem tau ntau dua thiab permeable, thaum cov khoom me me sau rau hauv qhov khoob ntawm cov khoom loj, ua rau cov ntsiab lus sib cuag ntawm lawv thiab ua rau cov khoom muaj zog.

Los ntawm kev ua cov qauv gradient, ntau- kev faib cov hmoov hmoov yog qhov zoo rau kev siv siab -. Lub hauv paus txheej nrog cov khoom me me muab cov cuab yeej siv dag zog, thiab cov txheej txheem nrog cov hmoov loj thiab cov hmoov loj dua tuaj yeem pab tau nrawm dua. Txoj kev ntawm lub tsev no txhim kho ob qho tib si kev ua haujlwm ntawm cov lim dej thiab kev tiv thaiv kom siab nyob rau hauv ib qho kev tivthaiv. Cov kws tshawb fawb uas kawm cov ntaub ntawv tau pom tias cov hmoov uas muaj kev tswj xyuas qhov loj me ntawm 20 thiab 45 micrometers tuaj yeem siv los ua cov qauv uas tuaj yeem tiv taus qhov siab tshaj 15 MPa thaum tseem muaj qhov txaus rau kev pom zoo.

Yuav kom tau txais qhov zoo tshaj plaws particle bonding tsis ua cov hmoov ntau ntom, uas yuav ua rau nws permeable tsawg, lub sintering kub thiab sij hawm yuav tsum tau ua tib zoo xaiv rau txhua hmoov sib tov.

Siab -Strength Sintered Hlau Powder rau Siab-Resistant Porous Lim Elements

Txhawm rau khaws cov porosity thaum tseem muab kev tiv thaiv siab, koj xav tau cov qauv hmoov uas yog tsim los rau kev siv cov qauv. Qhov kev ua tau zoo ntawm cov lim tiav lawm feem ntau yog teem los ntawm qhov zoo ntawm covsintered hlau hmoovua ntej nws yog sintered.

Kev xaiv cov khoom siv rau lub zog siab tshaj plaws - mus rau - Qhov hnyav ua haujlwm

Cov hmoov uas ua los ntawm titanium muaj lub zog siab heev - rau - qhov hnyav piv, uas ua rau lawv zoo tagnrho rau kev siv qhov hnyav thiab siab yuav tsum tau siv. Titanium yog ib txwm mechanically ruaj khov vim nws cov qauv siv lead ua yog hexagonal thiab kaw - ntim. Nws cov txheej txheem oxide passive kuj tiv thaiv xeb, txawm tias nyob rau hauv cov tshuaj hnyav hnyav. Rau PEM dej electrolysis siv, siab -purity titanium hmoov nrog tsawg dua 0.15% oxygen tso cai rau cov qauv kev ncaj ncees thiab hluav taws xob conductivity xav tau rau txoj hauj lwm kom ua tau zoo.

Cov hmoov hlau raws li nickel muaj ntau txoj kev xaiv rau kev siv siab - kub thiab siab - siab siv. Thaum qhov kub thiab txias, qhov twg titanium tuaj yeem nkag mus deform, cov ntaub ntawv no khaws lawv cov khoom siv kho tshuab. Stainless hlau hmoov qib, tshwj xeeb tshaj yog 316L formulations, yog tus nqi -cov kev xaiv zoo rau cov ntawv thov siab nruab nrab thiab muaj kev tiv thaiv zoo rau corrosion feem ntau.

Hmoov purity thiab nws cuam tshuam rau cov qauv kev ncaj ncees

Cov impurities hauv cov hmoov hlau ua raws li cov ntsiab lus ntawm kev ntxhov siab hauv cov qauv uas tau raug fused, uas tuaj yeem ua rau cov kab nrib pleb sib kis thaum lub siab thov thiab tshem tawm ntau zaus. High-cov hmoov purity txo cov qhov tsis xws luag, uas pab txhim kho kev tiv thaiv kev qaug zog thiab ua kom lub neej ua haujlwm. Thaum ua hmoov, cov txheej txheem uas siv roj atomization feem ntau tau txais cov qib purity zoo dua li cov txheej txheem uas siv cov khoom sib txuas.

Cov khoom sib txawv xws li carbon, nitrogen, thiab oxygen muaj qhov cuam tshuam loj rau cov khoom siv kho tshuab zoo. Qee cov tshuaj interstitial ua rau cov khoom muaj zog los ntawm cov khoom siv khov kho, tab sis ntau dhau ntawm nws ua rau nws yooj yim dua thiab nkig, uas tsis zoo rau kev siv hauv cov hlab ntsha siab. Txhawm rau kom muaj kuab paug interstitial nyob rau hauv kev tswj hwm thaum lub sijhawm tsim khoom thiab khaws cia, cov neeg tsim cov hmoov siv lub tshuab nqus tsev lossis cov txheej txheem inert cua.

Kev tshuaj xyuas cov tshuaj muaj pes tsawg leeg, kev ntsuas qhov loj me me, thiab kev txiav txim siab pom tseeb yog qee qhov kev ntsuam xyuas uas siv los kuaj xyuas cov hmoov zoo. Ua ke, cov xwm txheej no qhia cov neeg tsim khoom yuav ua li cas cov hmoov yuav coj thaum lub sijhawm nias thiab cua sov,

uas pab lawv khaws qhov zoo ib yam los ntawm ib pawg ntau lawm mus rau lwm qhov.

Sintered hlau hmoov xaiv rau siab -Tub thiab siab -Hloov siab

Thaum ua haujlwm hnyav, koj yuav tsum tau ceev faj heev thaum xaiv cov khoom siv vim tias lawv yuav tsum muaj peev xwm tswj tau qhov kub thiab txias, xeb tsis kam, thiab cov khoom siv hluav taws xob poob ntawm qhov kub thiab txias.

Kub Stability thiab Oxidation Resistance

Cov xwm txheej uas muaj cua sov ntau ua rau cov txheej txheem oxidation uas tuaj yeem ua rau cov lim tsis muaj zog thaum lub sijhawm. Thaum xaiv cov khoom siv, nws yog ib qho tseem ceeb uas yuav tau xav txog qhov ntsuas kub ntawm qhov kev pab cuam thiab qhov ua rau - ntawm huab cua. Titanium nyob twj ywm ruaj khov thiab tsis xeb ntawm qhov kub txog li 350℃ntev li ntev raws li kev tiv thaiv huab cua tau tswj xyuas. Thaum lub sijhawm no mus txog, cov txheej txheem tiv thaiv lossis lwm yam ntaub ntawv xav tau.

Nickel-raws li superalloy hmoov ua haujlwm tau zoo nyob rau hauv siab - qhov kub thiab txias vim tias lawv khaws lawv lub zog txhua yam ntawm qhov kub siab tshaj 600℃. Cov ntaub ntawv no tsis xeb vim tias ruaj khov chromium oxide nplais rau saum lawv thiab tiv thaiv cov qauv hlau hauv qab no. Yuav kom tau txais qhov zoo tshaj plaws inter-particle bonding uas tuaj yeem tiv taus thermal cycling yam tsis muaj microcracks, cov hmoov particle loj thiab sintering tsis yuav tsum tau optimized.

Thermal Expansion Matching thiab System Integration

Thaum cov khoom lim dej thiab cov vaj tsev nyob muaj tib lub thermal expansion tus nqi, kev ntxhov siab tsis tsim thaum kub hloov. Thaum ob qho khoom sib txawv nthuav dav ntawm tus nqi sib txawv, lawv tsim cov kev sib cuam tshuam uas tuaj yeem tawg cov ntsaws ruaj ruaj lossis cov qauv puas. Thaum xaiv cov hmoov hlau sintered, tag nrho cov txheej txheem yuav tsum raug coj mus rau hauv tus account kom paub tseeb tias lawv ua haujlwm nrog cov cua sov.

Cov txheej txheem hmoov sib xyaw ua rau nws ua tau los ua cov qauv sib xyaw nrog cov khoom tshwj xeeb thermal expansion. Thaum koj sib tov titaniumsintered hlau hmoovnrog me me ntawm cov khoom siv ceramic, koj hloov qhov nthuav dav coefficient thaum khaws cov hlau matrix cov txiaj ntsig hloov tau yooj yim.

Sib npaug Sintered Hlau Hmoov Porosity Nrog Lim Mechanical Strength

Ib qho kev sib tw loj hauv kev tsim lim yog nrhiav qhov sib npaug zoo tshaj plaws ntawm cov kev xav tau rau siab permeability thiab lub zog ntawm cov qauv. Qhov kev sib npaug no tseem ceeb tshwj xeeb tshaj yog nyob rau hauv siab - cov xwm txheej siab uas tsis muaj lub zog txaus tuaj yeem ua rau muaj kev puas tsuaj loj.

Porosity Control Los ntawm Powder Gradation

Lub porosity ntawm sintered lug yog cuam tshuam ncaj qha los ntawm cov hmoov gradation, uas yog qhov sib txawv ntawm qhov sib txawv particle loj feem. Ib qho me me particle loj faib ua qhov pores ntawm tib qhov loj, uas ua rau cov qauv ntws tau kwv yees, tab sis nws yuav raug nqi zog tensile. Cov qauv nrog qhov dav dav muaj qhov pores ntawm qhov sib txawv thiab muaj zog dua vim tias cov khoom ntim tau nruj dua, tab sis lawv tsis lim raws li qhov tseeb.

Cov kws tsim qauv siv cov qauv hauv computer los twv seb cov hmoov sib txawv yuav ua haujlwm li cas tom qab lawv tau sintered. Cov qauv no coj mus rau hauv tus account seb cov khoom txav mus li cas thaum lub sij hawm compaction, lub caj dab zoo li cas thaum lub sij hawm sintering, thiab yuav ua li cas lub pore network zoo li cas. Cov qauv pab nrog kev tsim cov hmoov formulations, uas txo cov naj npawb ntawm cov kev sim uas xav tau kom ncav cuag qhov xav tau.

Compression Moulding Parameters thiab ceev tswj

Thaum lub caij lim tau ua, lub zog compression hloov pauv ntsuab ntom,

uas yog pre-sintered compact ntom. Cov khoom uas muaj sintered thiab muaj cov xim ntsuab ntau dua yuav muaj zog dua thiab muaj qhov tsawg dua. Txhawm rau kom tau txais qhov zoo tshaj plaws kev ua haujlwm siab, koj yuav tsum nrhiav kom tau qhov sib npaug ntawm qhov sib npaug ntawm qhov xav tau los ua kom txaus cov khoom sib txuas rau kev sib txuas thiab qhib qhov pore qauv xav tau rau kev pom.

Nrog isostatic nias, lub siab yog siv sib npaug ntawm txhua qhov kev qhia. Qhov no ua rau qhov ceev ruaj khov nyob rau hauv cov duab complex dua nrog uniaxial nias. Thaum cov ntsiab lus lim muaj qhov sib txawv ntawm cov phab ntsa thicknesses lossis cov kab sib txuas sab hauv, qhov kev sib txuam no tseem ceeb.

Sintering Atmosphere thiab Temperature Optimization

Cov xwm txheej ntawm sintering muaj qhov cuam tshuam loj rau qhov kawg ntawm cov hmoov hlau hlau. Kev tswj cov huab cua nres oxidation thiab cia cov khoom sib txawv thiab kev sib raug zoo hauv txoj kev zoo tshaj plaws. Lub tshuab nqus tsev sintering tshem tawm cov oxides saum npoo thiab pab cov hlau sib txuas kom huv si, uas ua rau qhov chaw muaj zog tshaj plaws.

Hydrogen ib puag ncig sintering txo cov oxide zaj duab xis thiab ua rau cov khoom thermally conductive kom nws heats tusyees. Kev xaiv qhov kub zoo txheeb xyuas qhov sib txawv uas muaj qhov sib txawv ntawm ib leeg. Kev kub siab dua txhim kho cov kev sib raug zoo thiab lub zog ntawm cov khoom, tab sis lawv kuj ua rau cov nplej loj tuaj thiab ua kom ntom ntom, uas txo cov pores. Tswj cua sov thiab cua txias thaum lub sij hawm ntau theem ntawm sintering txhim kho ob qho tib si lub zog thiab permeability.

Tshwj xeeb Sintered hlau hmoov rau kev ntseeg siab siab -Pressure Filtration Structures

Rau kev siv ntau dua, koj xav tau cov hmoov sib tov uas tau tsim tshwj xeeb los ua kom tau raws li qhov xav tau kev ua tau zoo uas dhau mus dhau qib kev lag luam.

Customized Powder Formulations rau Daim Ntawv Thov -Cov Lus Qhia Tshwj Xeeb

PEM electrolysis systems yuav tsum tau lim cov ntsiab lus uas tuaj yeem tiv taus siab, ua hluav taws xob, thiab tsis xeb. Customized formulations ntawm qis -oxygen titanium hmoov yog ua kom tau raws li cov kev xav tau no. Ntev npaum li cov pa oxygen nyob qis dua 0.12%, cov qauv ntxeem tau yuav ua hluav taws xob zoo thiab tiv thaiv corrosion hauv acidic electrolyte ib puag ncig.

Cov thev naus laus zis rau kev kho qhov chaw particle hloov cov khoom ntawm cov hmoov tsis hloov nws cov khoom muaj pes tsawg leeg. Coatings rau saum npoo tuaj yeem ua rau sintering ua haujlwm zoo dua, uas tso cai rau koj ua cov txheej txheem ntawm qhov kub thiab txias uas ua rau me me microstructures. Cov txheej txheem no ua rau cov neeg kho tshuab zoo dua qub thaum khaws cov kev ntsuas tseeb uas xav tau rau cov ntsiab lus lim uas yuav tsum tau nyob hauv qee qhov ntau.

Quality Assurance thiab Batch Consistency

Txhawm rau kom paub tseeb tias qhov siab - siab lim cov ntsiab lus ua haujlwm raws li qhov xav tau, cov hmoov batch yuav tsum zoo ib yam.

Kev hloov pauv hauv cov khoom ntawm hmoov los ntawm ib qho kev tsim khoom ntau mus rau lwm qhov ua rau muaj kev sib txawv ntawm kev ua haujlwm uas ua rau kev tswj kom zoo thiab kwv yees kev ntseeg tau nyuaj. Cov neeg muab kev ntseeg siab ntawm sintered hlau hmoov siv cov kev sim nruj kom paub tseeb tias txhua pawg tsim khoom muaj cov pleev zoo, qhov loj me me, kev ntws tawm, thiab pom tseeb. Cov txheej txheem kev tswj xyuas cov txheej txheem khaws cia lub qhov muag ntawm cov yam ntxwv ntawm cov hmoov thaum lub sij hawm thiab qhov chaw ua ntej lawv ua rau cov khoom uas tsis ua raws li cov lus qhia tshwj xeeb. Qhov kev tswj xyuas zoo no ua rau kev tsim khoom los ntawm kev tso tseg thiab ua kom cov khoom lim ib txwm ua haujlwm raws li cov ntawv thov tseem ceeb xav tau.

Ntev -Lub Sij Hawm Ua Haujlwm thiab Kev Pabcuam Lub Neej Ua kom zoo

Thaum cov ntxaij lim dej tau siv nyob rau hauv qhov siab, lawv mus dhau ntawm lub voj voog ntawm cov neeg kho tshuab kev nyuaj siab, muaj peev xwm corrosion, thiab clogging ntawm pores los ntawm av thiab lwm yam hais. Kev xaiv cov khoom siv cuam tshuam li cas cov txheej txheem ntawm kev poob qis ua haujlwm dhau sijhawm. Cov qauv uas tiv taus kev ntxhov siab tawg pib thiab kev sib kis yog ua nrog siab -purity hmoov thiab optimized sintering.

Ntev -lub sij hawm ruaj khov yog nyob ntawm microstructure uas yog tsim los ntawm cov hmoov cov khoom thiab cov txheej txheem ua. Thaum nws los txog rau kev qaug zog, zoo, cov qauv zoo li qub feem ntau ua tau zoo dua li ntxhib, tsis tu ncua microstructures. Cov yam ntxwv tseem ceeb ntawm microstructural no yog ua los ntawm kev tswj cov hmoov ua thiab sintering optimization.

Raws li kev tshawb fawb cov ntaub ntawv los ntawm kev ntsuas lub neej nrawm, cov ntxaij lim dej ua los ntawm kev ua tib zoo xaiv sintered hlau hmoov ua kom lawv cov qauv kev ncaj ncees los ntawm ntau tshaj 10,000 qhov kev ntsuas siab tshaj plaws. Qhov no txhais tau hais tias kev lag luam tshuab yuav xav tau kev saib xyuas tsawg dua thiab muaj kev pabcuam ntev dua.

Xaus

Xaiv txoj caisintered hlau hmoovrau siab - siv lub siab pom, koj yuav tsum tau saib qhov zoo ntawm cov khoom, cov txheej txheem ua, thiab kev ua haujlwm xav tau. Cov yam ntxwv ntawm cov hmoov uas tau teeb tsa ua ntej nws tsim muaj qhov cuam tshuam loj npaum li cas cov khoom lim tiav ua haujlwm.

Tswj particle loj thiab siab purity ua cov qauv uas sintered nyob rau hauv ib txoj kev uas sib npaug txhua yam muaj zog nrog lub porosity xav tau rau kev pom ua hauj lwm. Cov txheej txheem tshwj xeeb yog siv los daws cov teeb meem xws li kev ua haujlwm ntawm qhov kub thiab txias, nyob rau hauv ib puag ncig corrosive uas corrode, los yog qhov yuav tsum tau siv hluav taws xob conductivity nyob rau hauv daim ntawv thov electrochemical.

Kev yuav cov khoom siv hmoov zoo los ntawm cov neeg muag khoom muaj npe nrov yog kev nqis peev uas them rau lub sijhawm ntev vim tias lawv nyob ntev dua, ua haujlwm tau zoo, thiab ua rau muaj kev ua haujlwm tsawg dua. Raws li kev lag luam txuas ntxiv mus rau kev ua haujlwm nyuaj dua, cov hmoov hlau tshwj xeeb ua lub luag haujlwm tseem ceeb dua hauv kev ua kom cov thev naus laus zis no ua tau.

Xav tau cov kws tshaj lij kev taw qhia txog kev xaiv cov hmoov hlau sintered rau koj siab -Cov ntawv thov siab?

NAVI Titanium yog tus kws tshaj lij ntawm kev ua kom siab - zoo sintered hlau hmoov thiab lim cov ntsiab lus uas tau tsim los ua haujlwm hnyav, siab - qhov chaw siab. Nrog peb cov kev txawj ntse hmoov metallurgy thiab kev paub txog PEM electrolysis daim ntaub ntawv, peb tuaj yeem tsim cov kev cai daws teeb meem uas txhim kho ob qho tib si lub zog thiab kev ua haujlwm pom.

Peb tuaj yeem ua kom siab -purity, qis- cov pa oxygen titanium hmoov nrog kev tswj particle loj ntau yam uas tau ua kom haum rau koj cov kev xav tau ntawm kev ua haujlwm siab thiab kev ua haujlwm. Peb cov qauv qhov tshwj xeeb nrog qhov ntau thiab tsawg ntawm 5 txog 80 micrometers kom paub tseeb tias cov dej thiab roj tuaj yeem txav mus los ntawm cov khoom siv tau zoo thaum ua kom cov qauv kev ncaj ncees hauv cov xwm txheej hnyav.

Raws li ib tug txhim khu kev qha muab kev pabsintered hlau hmoov, peb muab kev pabcuam tag nrho, los ntawm kev xaiv cov ntaub ntawv zoo kom paub tseeb tias cov khoom ua haujlwm zoo. Hu rau peb pab pawg engineering ntawmsales@navititanium.comlos tham txog yuav ua li cas peb cov kev daws teeb meem tshwj xeeb tuaj yeem txhim kho qhov kev ua tau zoo thiab ruaj khov ntawm koj qhov kev pom.

Cov ntaub ntawv

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