Cov tshuaj tseem ceeb ntawm cov hmoov microsilica yog silica, ntawm cov silica feem ntau muaj nyob rau hauv amorphous theem (los yog amorphous silica), nrog rau cov ntsiab lus ntawm ntau tshaj 80%, ob peb impurities, thiab ib qho chaw nto ntawm 20-28/g . Cov khoom uas muaj qhov me me tsawg dua 10m tus account rau ntau tshaj 80%. Nws muaj tshuaj lom neeg ua haujlwm siab thiab yooj yim rau kev hnov mob alkali. Nws muaj cov yam ntxwv ntawm lub teeb yuag, siab refractoriness thiab muaj zog ua haujlwm. Siv dav hauv kev tsim kho thiab kev lag luam.
Microsilica hmoov muaj thaj chaw loj, tsim cov pores thiab muaj zog adsorption nyhuv. Cov ntaub ntawv adsorption npaj los ntawm microsilica hmoov muaj cov nyhuv adsorption zoo rau cov hlau hnyav, CO2, roj thiab roj, thiab lwm yam. Nws yog qhov pom tau tias cov ntaub ntawv adsorbent npaj los ntawm microsilica hmoov yuav tau siv dav hauv kev kho dej khib nyiab, khib nyiab, kua khib nyiab, thiab lwm yam. Hloov cov plua plav uas muaj kuab heev rau hauv cov tshuaj reagent zoo rau kev tswj ib puag ncig yog ib qho tseem ceeb ntawm kev tsim kho tshiab ntawm kev siv cov microsilica fume.
Txij li thaum silica fume tuaj yeem calcined ntawm qhov kub thiab txias los yog yaj hauv alkali los npaj cov iav dej, txawm tias silica fume lossis iav dej siv los ua silicon los npaj silica aerogel, kev siv nyiaj ntau ntxiv ntawm silica fume tuaj yeem ua tiav. Silica airgel npaj los ntawm microsilica hmoov raws li cov khoom siv silicon muaj cov yam ntxwv ntawm cov porosity siab, siab zog, tsis tshua muaj siab, zoo thermal rwb thaiv tsev kev ua tau zoo, thiab tsis muaj tshuaj lom, thiab yuav tsum tau siv dav hauv aerospace, kev tsim kho, tshuaj thiab lwm yam lag luam.
Tom qab cov hmoov microsilica sib xyaw rau hauv cov cement pob zeb, nws tuaj yeem ua tiav qhov khoob ntawm cov cement hais thiab ua rau cov cement slurry denser. Tsis tas li ntawd, nws kuj ua ke nrog dawb Ca (OH) los tsim cov calcium silicate hydrate 2cao.SiO2.H2O. Lub zog gel ntawm cov hydrate no siab dua li ntawm Ca (OH) muaju, thiab nws cov ntsiab lus tseem ceeb yog:
(1) Ua kom muaj zog. Lub zog compressive thiab flexural zog ntawm cov pob zeb tau zoo heev. Los ntawm kev ntxiv 5-10% silica fume, lub zog compressive tuaj yeem nce los ntawm 10-30%, thiab lub zog flexural tuaj yeem nce ntau dua 10%.
(2) Ua kom ceev ceev. Lub impermeability tau nce los ntawm 5-18 zaug, thiab cov tshuaj tiv thaiv tau nce ntau dua 4 zaug.
(3) Frost tsis kam: Tom qab 300-500 cycles ntawm ceev thawing, tus txheeb ze elastic modulus ntawm silica fume nce thiab txo los ntawm 10-20%. Tom qab 25-50 cycles ntawm cov pob zeb zoo tib yam, cov txheeb ze elastic modulus nce thiab txo los ntawm 30-73%.
(4) Lub zog thaum ntxov: Microsilica fume qhob ua kom luv lub sij hawm induction thiab muaj cov yam ntxwv ntawm lub zog thaum ntxov.
(5) Abrasion kuj thiab cavitation tswj: High-purity silica fume manufacturers ntseeg hais tias piv nrog rau cov pob zeb zoo tib yam, lub abrasion kuj ntawm microsilica fume qhob yog nce los ntawm 0.5-2.5 zaug, thiab cov cavitation tsis kam yog nce los ntawm 3-16 zaug.
