HPMC (HydroxyPropal Metylcellulose) yog qhov tsis-ionic cellulge siv ntau dua li cov thickener, emulsifier thiab adhesive nyob rau ntau yam kev lag luam. Nyob rau hauv xyoo tas los, HPMC tau dhau los ua kev cog lus ntxiv rau hauv kev tsim khoom ntawm honeycomb ceramics vim nws cov khoom ntiag tug thiab cov yam ntxwv.
Honeycomb Ceramics yog hom ceramic tshwj xeeb los ntawm honeycomb-zoo li qauv qauv ntawm channel lossis raws khiav los ntawm lawv. Cov channel no feem ntau yog ntim nrog huab cua lossis lwm cov roj av, muab cov roj ceeamics zoo heev, cov cua sov thiab tshuaj lom neeg. Honeycomb Ceramics muaj feem ntau siv nyob rau hauv kev siv cov twj catalytic, Diesel Pauv Hloov thiab cov hluav taws xob siab rau cov khoom sib piv, qis zog poob thiab zoo heev thermal stability.
Txhawm rau tsim cov honeycomb ceramics, ib qho slurry ntawm Ceramic hmoov thiab phau ntawv yog hliv rau hauv cov pwm nrog lub honeycomb core. Tom qab cov slurry solidies, lub binder yog hlawv tawm thiab cov qauv kev txhim kho ntawm qhov kub thiab txias kom tsim cov khaub thuas sib zog. Txawm li cas los xij, ib qho ntawm cov kev sib tw loj hauv kev tsim cov ceramic honeycombs yog qhov ruaj ntseg ntawm cov slurry. Cov Slurry xav tau ruaj khov txaus los sau cov honeycomb core thiab zam txhua yam distortion, tawg lossis tsis xws luag nyob rau hauv cov khoom kawg.
Qhov no yog qhov chaw HPMC los ua si. HPMC muaj cov dej ua haujlwm zoo heev, viscosity thiab adhesive cov khoom, uas ua rau nws yog qhov zoo tshaj plaws thickerer thiab stabrizer rau honeycomb ceramics. Los ntawm kev ntxiv HPMC rau Ceramic slurry, lub viscosity ntawm slurry nce, uas pab tau hauv kev khaws nws cov duab thiab tsis txhob muaj kev cuam tshuam lossis kev sib cais thaum lub sijhawm ua tiav. Tsis tas li ntawd, HPMC pab txhim kho cov nplaum ntawm cov kab ke ceramic, yog li txhim kho cov khoom siv zog thiab kev ruaj khov ntawm cov honeycomb kab ke.
Ntxiv rau cov khoom siv thickening thiab ruaj khov, HPMC muab ntau lwm cov txiaj ntsig rau Cellular ceramics. Piv txwv li, HPMC tuaj yeem ua raws li lub pore ua ntej, pab tsim cov khaub ncaws tsis sib xws thiab tswj cov pores hauv cov qauv kab sib xyaws. Nyob rau hauv lem, qhov no tuaj yeem nce thaj tsam npoo thiab porosity ntawm honeycomb ceramic, yog li txhim kho nws txoj kev ua tau zoo li catalyst lossis lim. Tsis tas li ntawd, HPMC tau sib haum nrog ntau yam Ceramic hmoov, ua rau nws haum rau ntau yam ntawm honeycomb ceramic kev siv.
Txawm li cas los xij, muaj qee cov kev cov nyom cuam tshuam nrog kev siv HPMC ua cov tuab thiab muaj stabilizer rau honeycomb ceramics. Ib qho ntawm cov kev sib tw tseem ceeb yog qhov ua tau zoo ntawm HPMC concentration thiab viscosity. Ntau dhau HPMC tuaj yeem ua rau muaj viscosity ntau heev, uas tuaj yeem cuam tshuam qhov ntws ntawm cov slurry thiab ua rau tsis xws luag nyob rau hauv cov khoom kawg. Ntawm qhov tod tes, me ntsis HPMC yuav tsis muab kev ruaj khov txaus thiab adhesion, uas yuav ua rau cov honeycomb ceramic qauv kom tawg lossis deform. Yog li ntawd, nws yog ib qho tseem ceeb kom pom qhov sib npaug tsim nyog ntawm HPMC concentration thiab viscosity raws li cov kev cai thov.
Lwm qhov kev sib tw hauv kev siv HPMC yog nws cov kev ruaj khov thermal. Honeycomb ceramics feem ntau yog raug tua thaum kub, uas tuaj yeem ua rau HPMC kom thuam lossis rhuav tshem. Qhov no nyob rau hauv lem tej zaum yuav cuam tshuam rau cov neeg kho tshuab thiab tshuaj ntawm cov honeycomb ceramic qauv. Yog li ntawd, nws yog ib qho tseem ceeb uas yuav tsum xaiv ib qib ntawm HPMC nrog txaus thermal stability thiab compatibility nrog ceramic hmoov.
HPMC yog ntau yam kev ntxiv uas muaj ntau yam zoo ua cov tuab thiab muaj stabilizics rau honeycomb ceramics. Nws cov khoom tshwj xeeb thiab cov khoom ua rau nws zoo tagnrho rau kev txhim kho kev ruaj khov, adhesion thiab tshuab ua haujlwm ntawm honeycomb tej kab ceramic. Txawm li cas los xij, cov kev sib tw cuam tshuam nrog nws siv, xws li kev ua kom zoo dua ntawm kev pom zoo, yuav tsum tau ua tib zoo hais kom ua tau zoo thiab ua haujlwm ntawm cov khoom kawg.
Lub Sijhawm Post: Feb-19-2025