Dab tsi yog Qhov Zoo Ntawm Silicon Powder?

Microsilica, los yog silica fume, yog cov khoom siv pozzolanic uas zoo li ya tshauv lossis portland cement nyob rau hauv tsos. Nws yog tsim los ntawm cov uas tsis yog-crystalline los yog amorphous silica (silicon dioxide) thiab nta cov khoom uas yog 100 npaug me dua li cov qauv cement. Qhov no txhais tau hais tias microsilica hais tias ntsuas tsawg dua 1 micron inch thiab tsim cov hmoov ultrafine nrog qhov ceev ntawm 2.2 grams ib cubic centimeter.

Microsilica tuaj yeem muab faib ua ob hom: densified thiab undensified microsilica.

Undensified Microsilica:Ntau qhov ceev ntawm 250-350 kg/m³.

Microsilica densified:Ntau qhov ceev ntawm 550-700 kg/m³.

Vim li cas Microsilica tseem ceeb?

Microsilica yog cov khoom tseem ceeb rau kev tsim cov khoom siv refractory thiab pob zeb. Thaum ntxiv rau pob zeb, nws txhim kho nws cov khoom siv kho tshuab, txhim kho kev tiv thaiv corrosion, nce sulfate tsis kam, thiab muaj kev tiv thaiv zoo dua. Ntxiv mus, siv microsilica hauv pob zeb yuav pab txo qis permeability thiab txhim kho durability.

Microsilica yog cov khoom siv ntau yam siv los tsim yuav luag txhua qib ntawm pob zeb. Nws kuj tseem ntxiv dag zog rau cov ntaub ntawv refractory thiab txhim kho lawv cov kev ua haujlwm kub, nrog rau kev siv hauv cov roj hmab, dej iav, thiab lwm yam lag luam.

Microsilica siv li cas hauv pob zeb?

Txhawm rau kom nkag siab qhov zoo thiab qhov tsis zoo ntawm microsilica, nws yog ib qho tseem ceeb kom paub txog cov tshuaj tiv thaiv uas tshwm sim thaum silica fume ntxiv rau pob zeb.

Thaum pib, microsilica tseem inert thaum ntxiv rau pob zeb. Thaum dej pib reacting nrog portland cement nyob rau hauv qhov sib tov (hydration), ob lub ntsiab lus tseem ceeb yog tsim:

Calcium Silicate Hydrate (CSH):Ib qho crystalline compound ua lub luag haujlwm rau cov khoom siv lub zog.

Calcium Hydroxide (CH):Ib tug byproduct uas ua raws li ib tug muab tub lim thiab sau lub pores nyob rau hauv lub pob zeb.

Tom ntej no, calcium hydroxide reacts nrog microsilica nyob rau hauv ib tug pozzolanic cov tshuaj tiv thaiv, ua ntxiv calcium silicate hydrate tebchaw uas sau cov voids nyob ib ncig ntawm lub hydrated cement hais. Cov CSH txuas ntxiv no muab cov denser matrix rau cov pob zeb, txhim kho nws cov flexural, compressive, thiab bonding zog zog.

Cov txiaj ntsig tseem ceeb ntawm Microsilica

Vim nws cov khoom, microsilica yog dav siv thoob ntiaj teb los txhim kho lub zog thiab kav ntev ntawm pob zeb. Microsilica tuaj yeem yooj yim tau los ntawm cov neeg muag khoom xws li Henan Superior Abrasives Ntshuam & Export Trading Co., Ltd., thiab ntxiv rau thaum lub sij hawm tsim cov txheej txheem los txhim kho cov yam ntxwv ntawm ob qho tib si tshiab thiab hardened pob zeb.

Cov txiaj ntsig tseem ceeb ntawm Microsilica

Chemical thiab Physical Properties ruaj khov heev:Microsilica ua raws li qhov nruab nrab muab tub lim nrog cov tshuaj lom neeg ruaj khov thiab lub cev muaj zog. Nws tsis muaj cov dej crystalline, tsis koom nrog kev kho cov tshuaj tiv thaiv, thiab tsis cuam tshuam rau cov txheej txheem tshuaj tiv thaiv.

Txhim kho Thermal conductivity:Microsilica tsis tsuas yog txhim kho thermal conductivity tab sis kuj txhim kho hluav taws kub thiab hloov cov kev sib txuas ceev.

Zoo Adsorption Properties:Microsilica muaj cov khoom zoo adsorption thiab zoo wettability nrog ntau yam resins. Tsis tas li ntawd, nws sib tov yooj yim yam tsis muaj clumping.

Txo nag los nag thiab cais:Vim nws qhov loj me me thiab tsim nyog tis, microsilica zoo tshem tawm kev sib cais thiab txo cov nag lossis daus.

Ua kom muaj zog:Qhov tsim nyog particle loj tis ntawm microsilica kom zoo hardness, muaj zog densification, thiab zoo heev hnav tsis kam. Ntxiv microsilica rau pob zeb tuaj yeem txhim kho kev puas tsuaj, compressive zog, thiab tensile lub zog ntawm cov khoom kho. Abrasion resistance tuaj yeem txhim kho los ntawm 0.5-2.5 zaug.

Txhim kho rwb thaiv tsev:Microsilica yog tsim los ntawm ntshiab silica hmoov nrog cov ntsiab lus impurity tsawg. Yog li, nws muaj cov tshuaj ruaj khov thiab lub cev muaj zog uas ua kom zoo arc tsis kam thiab rwb thaiv tsev ntawm cov ntaub ntawv kho.

Txo Cov Nqi Tag Nrho:Qhov ntom ntom ntawm microsilica nyob nruab nrab ntawm {{0}}.2 thiab 0.8 lossis 1.0 thiab 2.2. Thaum siv los ua cov khoom siv polymer, microsilica tuaj yeem txo tus nqi tag nrho ntawm cov khoom los ntawm kev txuag ntawm kev siv polymer thiab txo qhov ntim ntim.

Txhim kho Corrosion Resistance:Microsilica muaj cov silicon dioxide, cov khoom siv inert. Qhov no txhais tau tias microsilica tsis hnov ​​​​mob nrog feem ntau alkalis lossis acids. Nws uniformly faib rau saum npoo ntawm cov khoom, yog li txhim kho cavitation thiab corrosion kuj los ntawm 3 mus rau 16 zaug.

Shortened Induction Lub Sijhawm:Ntxiv microsilica rau pob zeb tuaj yeem txo lub sijhawm induction thiab muab lub zog thaum ntxov.

Kev Tiv Thaiv Kev Txhaum Cai:Microsilica tuaj yeem txo qhov kub siab ntawm epoxy curing cov tshuaj tiv thaiv. Nws kuj txo qis tus nqi shrinkage thiab linear expansion coefficient ntawm kho pob zeb, txo cov kev ntxhov siab sab hauv thiab tiv thaiv kev tawg.

Txhim kho Freeze-Thaw Resistance:Microsilica tus txheeb ze elastic modulus tsuas yog 10-20% tom qab 300-500 khov-thaw mus. Hauv qhov sib piv, qhov nruab nrab elastic modulus ntawm cov qhob zoo tib yam yog 30-73% tom qab 25-50 cycles. Yog li, ntxiv microsilica rau pob zeb ua tau zoo txhim kho nws qhov khov-thaw tsis kam.

Disadvantages ntawm Microsilica hauv pob zeb

Thaum microsilica undoubtedly muaj nws kim heev zoo thaum ntxiv rau pob zeb, nws kuj muaj ib co drawbacks:

Kev tsim kho nyuaj:Kev ua haujlwm ntawm pob zeb yog qhov tseem ceeb thaum tsim cov pob zeb sib xyaw. Piv txwv li, ntxiv cov microsilica ntau dhau tuaj yeem txo cov khoom siv ua haujlwm, ua rau cov pob zeb ua kom tawv nqaij thiab nyuaj rau plaster lossis compact, tsis zoo rau qhov zoo, smoothness, thiab uniformity ntawm qhov chaw.

Dry Shrinkage:Microsilica pob zeb nthuav qhia cov nqi shrinkage ntau dua li cov pob zeb zoo tib yam, tshwj xeeb tshaj yog thaum ntxov qhuav shrinkage. Qhov no tuaj yeem raug ntaus nqi los ntawm kev sau cov nyhuv ntawm microsilica, uas txo cov dej ntsiab lus hauv cov pob zeb, ua rau kom qhuav shrinkage tawg. Qhov no tuaj yeem cuam tshuam tag nrho lub zog ntawm cov khoom lag luam thiab txwv tsis pub muaj peev xwm siv tau.

Tsis tas li ntawd, thaum kub sab nraud yog siab, cov dej saum npoo av evaporation ntau tshaj qhov los ntshav, ua rau nto qhuav shrinkage tawg. Hmoov zoo, qhov teeb meem no tuaj yeem txo tau los ntawm kev tsom mus rau kev txhim kho tom qab kev tsim kho vaj tse, xws li kev siv dej txhim kho thiab cov txheej txheem txau.

Kub Cracks:Microsilica qhob kuj tseem ua rau kub tawg. Thaum lub zog ntxov txhim kho sai nrog qhov sib ntxiv ntawm microsilica, cov cua sov sib xws uas tsim los ntawm cov pob zeb ua dej tawg sai sai, ua rau muaj qhov kub thiab txias. Qhov no, nyob rau hauv lem, siv high thermal stress rau cov khoom, tsom rau sab saum toj ntawm qhuav shrinkage tawg. Qhov no tuaj yeem ua rau cov kab nrib pleb no txuas ntxiv mus, ua rau muaj kev sib tsoo los ntawm kev tawg.

Tus nqi siab:Microsilica kuj tseem kim piv rau ya tshauv lossis cement. Txawm hais tias kev siv cov microsilica nce cov nqi ua ntej, qhov kev ua tau zoo ntawm silica fume cement yuav offset tus nqi nyob rau lub sijhawm ntev.