Adhesive rau txhaj tshuaj molding thiab molding ntawm industrial ceramics

Adhesive rau txhaj tshuaj molding thiab molding ntawm industrial ceramics

Silicon nitride, vim nws cov khoom zoo xws li lub zog siab, siab hnav tsis kam, tsis tshua muaj siab (lub teeb), kub tsis kam, thiab corrosion kuj, yog tsim rau kev tsim cov khoom siv ceramic rau tsheb xws li turbine feeder impellers, rocker arm burners, thiab auxiliary. combustion chav. Cov khoom siv no xav tau cov duab sib txawv, qhov ntev-precision siab, thiab kev ntseeg siab. Internal defects (kawg, pores, txawv teb chaws khoom, thiab lwm yam) thiab nto defects tsis raug tso cai.

Ib qho ntawm cov txheej txheem molding uas ua tau raws li cov kev cai zoo no yog ceramic txhaj molding (siab-siab). Cov txheej txheem ntws yog raws li nram no:

Hauv kev tsim cov txheej txheem ntawm kev lag luam ceramics, qhov tsis xws luag xws li grooves tshwm sim los ntawm fluidity ntawm cov khoom tsim, qhov kub ntawm cov qauv hlau, thiab qhov tshwm sim los ntawm kev tsim cov xwm txheej yuav tsum tsis txhob tsim; Nyob rau hauv cov txheej txheem degreasing, nws tsis raug tso cai los tsim degreasing kab nrib pleb tshwm sim los ntawm cov khoom siv organic muaj pes tsawg leeg thiab thermal decomposition tus nqi. Kev xaiv cov khoom siv organic kuj tseem yuav ua tau raws li cov kev xav tau zoo no.

Feem ntau hais lus, cov khoom siv organic siv hauv kev txhaj tshuaj ceramic yog tsim los ntawm cov nplaum, cov khoom ntxiv, thiab cov yas yas. Cov nplaum nplaum tuaj yeem yog polypropylene (PP), irregular polypropylene (APP), polyethylene (PE), ethylene vinyl acetate copolymer (EVA), polystyrene (PS), acrylic resin, thiab lwm yam. Ntawm lawv, PE muaj formability zoo heev; EVA muaj kev sib raug zoo nrog lwm cov resins, nrog rau zoo flowability thiab formability; APP muaj cov yam ntxwv ntawm kev sib raug zoo nrog lwm cov resins, nplua nuj fluidity thiab degreasing; PS muaj liquidity zoo. Cov additives muaj xws li paraffin wax, microcrystalline paraffin wax, hloov paraffin ciab, natural paraffin wax, stearic acid, thiab additives. Lub flowability ntawm cov ntaub ntawv tsim tuaj yeem raug soj ntsuam los ntawm kev ntsuas qhov ntsuas siab thiab qhov sib faib cov yaj. Thaum muaj cov ntsiab lus siab ntawm cov nplaum nyob rau hauv degreasing, muaj kev nyiam rau degreasing kom txo qis, thiab cov uas muaj cov khoom siv ntxiv paraffin muaj kev ua haujlwm zoo dua. Yog tias cov ntaub ntawv organic tsis tuaj yeem ya mus rau hauv qhov kub thiab txias, nws yuav cuam tshuam rau sintering ntawm ceramics. Yog li ntawd, nws yog ib qho tsim nyog yuav tau xav txog cov yam ntxwv ntawm thermal decomposition thiab xaiv.

Cov khoom siv organic siv hauv kev lag luam ceramic txhaj tshuaj molding yuav tsum raug xaiv los ua kom zoo dua qhov ntws ntawm cov khoom molding thiab cov khoom degreasing ntawm lub cev molding.

3. Cordierite, ib tug binder rau industrial ceramic extrusion molding thiab molding, yog dav siv los ua ib tug cab kuj rau automotive pa purification catalysts vim nws cov khoom zoo heev xws li kub tsis kam, corrosion kuj, ntxeem tau khoom, thiab tsis tshua muaj thermal expansion. Cordierite honeycomb qauv siv cov kev taw qhia ntawm cov khoom siv raw khoom los tsim cov thermal expansion ntawm honeycomb qauv, uas tuaj yeem tsim los ntawm extrusion molding txoj kev.

Raws li cov molecular muaj pes tsawg leeg ntawm cordierite (2MgO · 2Al2O3 · 5SiO2), talc, kaolin, thiab alumina tuaj yeem xaiv los ua raw khoom. Cov av ntsuab siv rau molding nkag mus rau hauv lub qhov ncauj npog los ntawm lub qhov muab khoom nyob rau hauv, thiab tom qab subdivision, nws expands mus rau hauv nyias phab ntsa thiab ces sib txuas kom tau zoo nrog zoo extensibility thiab adhesion. Tsis tas li ntawd, raws li ib tug honeycomb zoo li lub cev tsim los ntawm extrusion, nyob rau hauv thiaj li yuav tswj tau nws cov duab, lub siab dua tus nqi ntawm cov av nplaum, qhov zoo dua. Uas yog hais, kev xaiv ntawm cov nplaum yuav tsum optimize lub fluidity thiab nws tus kheej preservation zog ntawm cov av nplaum.

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