Los ntawm kev kawm txog cov txiaj ntsig ntawm ntau npaum li cas ntawm hydroxypropyl methylcellulose (HPMC) ntawm kev luam ntawv, rheological zog thiab cov khoom siv tshuab ntawm 3D luam ntawv mortar, qhov tsim nyog npaum li cas ntawm HPMC tau tham txog, thiab nws txoj kev cuam tshuam tau soj ntsuam ua ke nrog lub tshuab microscopic morphology. Cov txiaj ntsig tau pom tias qhov fluidity ntawm mortar txo qis nrog qhov nce ntawm cov ntsiab lus ntawm HPMC, uas yog qhov extrudability txo qis nrog qhov nce ntawm cov ntsiab lus ntawm HPMC, tab sis qhov fluidity retention muaj peev xwm txhim kho. Extrudability; Cov duab tuav tus nqi thiab nkag mus rau hauv tus kheej qhov hnyav nce ntxiv nrog rau qhov nce ntawm HPMC cov ntsiab lus, uas yog, nrog nce ntawm HPMC cov ntsiab lus, stackability txhim kho thiab luam ntawv lub sij hawm ntev; los ntawm qhov pom ntawm rheology, nrog rau kev nce ntawm cov ntsiab lus ntawm HPMC, qhov pom tseeb viscosity, tawm los kev ntxhov siab thiab cov yas viscosity ntawm slurry nce ntau, thiab cov stackability zoo tuaj; thixotropy thawj zaug tau nce thiab tom qab ntawd txo qis nrog qhov nce ntawm cov ntsiab lus ntawm HPMC, thiab kev luam tawm tau zoo dua; cov ntsiab lus ntawm HPMC nce siab dhau lawm yuav ua rau cov mortar porosity nce thiab lub zog Nws raug pom zoo tias cov ntsiab lus ntawm HPMC yuav tsum tsis pub tshaj 0.20%.
Nyob rau hauv xyoo tas los no, 3D luam ntawv (tseem hu ua "additive manufacturing") thev naus laus zis tau tsim kho sai thiab tau siv dav hauv ntau qhov chaw xws li bioengineering, aerospace, thiab kev tsim txuj ci. Cov txheej txheem pwm-dawb ntawm 3D luam ntawv thev naus laus zis tau txhim kho cov khoom siv zoo heev thiab qhov yooj yim ntawm cov qauv tsim thiab nws txoj kev siv tshuab siv tsis tau tsuas yog txuag cov neeg ua haujlwm, tab sis kuj tsim nyog rau kev tsim kho hauv ntau qhov chaw hnyav. Kev sib xyaw ua ke ntawm 3D luam ntawv thev naus laus zis thiab kev tsim kho kev lag luam yog qhov tshiab thiab pheej hmoo. Tam sim no, cov ntaub ntawv cement-based 3D Cov txheej txheem ntawm kev luam ntawv yog cov txheej txheem extrusion stacking (xws li cov txheej txheem contour contour crafting) thiab cov txheej txheem luam ntawv thiab hmoov sib tov (D-shape txheej txheem). Ntawm lawv, cov txheej txheem extrusion stacking muaj qhov zoo ntawm qhov sib txawv me me los ntawm cov txheej txheem ua vaj tse molding, kev ua tau zoo ntawm cov khoom loj loj thiab cov nqi tsim kho. Qhov zoo dua qub tau dhau los ua qhov kev tshawb fawb hotspots ntawm 3D tshuab luam ntawv ntawm cov khoom siv cement.
Rau cov ntaub ntawv cement-based siv los ua "cov ntaub ntawv number case" rau 3D luam ntawv, lawv cov kev xav tau ntawm kev ua tau zoo sib txawv ntawm cov khoom siv cement-based: ntawm ib sab, muaj qee qhov kev xav tau rau kev ua haujlwm ntawm cov khoom siv cement-based tshiab, thiab Cov txheej txheem tsim kho yuav tsum ua kom tau raws li qhov yuav tsum tau ua ntawm kev sib tw du, Ntawm qhov tod tes, cov khoom siv ntawm cov cement-based extruded yuav tsum tau stackable, uas yog, nws yuav tsis tawg los yog deform loj nyob rau hauv qhov kev txiav txim ntawm nws tus kheej qhov hnyav thiab lub siab ntawm cov khoom. txheej sab sauv. Tsis tas li ntawd, cov txheej txheem lamination ntawm 3D luam ntawv ua rau cov khaubncaws sab nraud povtseg ntawm cov khaubncaws sab nraud povtseg Nyob rau hauv thiaj li yuav xyuas kom meej lub zoo mechanical zog ntawm lub interlayer interface cheeb tsam, 3D printing tsev cov ntaub ntawv yuav tsum kuj muaj zoo adhesion. Hauv cov ntsiab lus, tus tsim ntawm extrudability, stackability, thiab siab adhesion yog tsim nyob rau tib lub sijhawm. Cov ntaub ntawv cement-based yog ib qho ntawm cov yuav tsum tau ua ua ntej rau kev siv 3D tshuab luam ntawv hauv kev tsim kho. Kho cov txheej txheem hydration thiab rheological zog ntawm cov ntaub ntawv cementitious yog ob txoj hauv kev los txhim kho cov ntawv luam tawm saum toj no. Kev kho cov txheej txheem hydration ntawm cov ntaub ntawv cementitious Nws yog ib qho nyuaj rau kev siv, thiab nws yooj yim los ua teeb meem xws li cov yeeb nkab thaiv; thiab cov kev cai ntawm rheological zog yuav tsum tau tswj lub fluidity thaum lub sij hawm luam ntawv thiab cov txheej txheem ceev tom qab extrusion molding.Nyob rau hauv kev tshawb fawb tam sim no, viscosity modifiers, ntxhia admixtures, nanoclays, thiab lwm yam yog feem ntau siv los kho cov rheological zog ntawm cement-based cov ntaub ntawv kom ua tiav kev luam ntawv zoo dua.
Hydroxypropyl methylcellulose (HPMC) yog ib hom polymer thickener. Cov hydroxyl thiab ether bonds ntawm cov saw molecular tuaj yeem ua ke nrog dej dawb los ntawm hydrogen bonds. Taw qhia nws rau hauv pob zeb tuaj yeem txhim kho nws txoj kev sib raug zoo. thiab khaws cia dej. Tam sim no, kev tshawb fawb txog cov txiaj ntsig ntawm HPMC ntawm cov khoom ntawm cov khoom siv cement feem ntau yog tsom rau nws cov txiaj ntsig ntawm fluidity, dej tuav, thiab rheology, thiab kev tshawb fawb me me tau ua tiav ntawm cov khoom ntawm 3D luam ntawv cement-based cov ntaub ntawv ( xws li extrudability, stackability, thiab lwm yam). Tsis tas li ntawd, vim tsis muaj cov qauv zoo sib xws rau 3D luam ntawv, txoj kev ntsuam xyuas rau kev luam tawm ntawm cov ntaub ntawv cement-based tseem tsis tau tsim. Lub stackability ntawm cov khoom raug soj ntsuam los ntawm tus naj npawb ntawm cov txheej txheem luam tawm nrog qhov tseem ceeb deformation lossis qhov siab tshaj plaws luam ntawv. Cov kev ntsuam xyuas saum toj no yog ua raws li kev kawm siab, tsis zoo universality, thiab cov txheej txheem cumbersome. Txoj kev ntsuas kev ua tau zoo muaj peev xwm thiab muaj txiaj ntsig zoo hauv kev thov engineering.
Hauv daim ntawv no, ntau npaum li cas ntawm HPMC tau nkag mus rau hauv cov ntaub ntawv cement-based los txhim kho cov ntawv luam tawm ntawm mortar, thiab cov teebmeem ntawm HPMC ntau npaum li cas ntawm 3D luam ntawv mortar cov khoom tau raug soj ntsuam los ntawm kev kawm txog kev luam ntawv, rheological zog thiab txhua yam khoom. Raws li cov khoom xws li fluidity Raws li kev soj ntsuam cov txiaj ntsig, cov mortar sib xyaw nrog cov txiaj ntsig zoo ntawm HPMC tau raug xaiv rau kev luam ntawv pov thawj, thiab qhov cuam tshuam ntawm qhov chaw luam tawm raug kuaj; Raws li kev tshawb fawb ntawm microscopic morphology ntawm tus qauv, lub hauv paus mechanism ntawm kev ua tau zoo evolution ntawm cov ntaub ntawv luam ntawv tau tshawb. Nyob rau tib lub sijhawm, 3D luam ntawv cement-based khoom tau tsim. Ib txoj kev ntsuam xyuas kev ua tau zoo ntawm cov ntawv luam tawm los txhawb kev siv 3D tshuab luam ntawv hauv kev tsim kho.
Post lub sij hawm: Sep-27-2022