Kaolin, calcined kaolin, ntxuav kaolin, metakaolin.

Kev siv cov kaolin muaj xws li:
Raws li qhov tsim nyog cov khoom siv ntxhia rau ntau qhov kev lag luam, xws li daim ntawv ua, ceramics, roj hmab, tshuaj lom neeg kev lag luam, txheej, tshuaj thiab kev tiv thaiv lub teb chaws, kaolin muaj qee yam plasticity, uas ua rau cov av nkos ceramic lub cev muaj zog rau tig, grouting thiab sib sau.

Lub luag hauj lwm ntawm kaolin nyob rau hauv ceramics yog qhia Al2O3, uas yog conducive rau tsim ntawm mullite thiab txhim kho nws cov tshuaj stability thiab sintering zog.

Thaum lub sij hawm sintering, kaolin decomposes rau hauv mullite, tsim lub hauv paus ntsiab lus ntawm lub cev ntsuab lub zog, uas muaj peev xwm tiv thaiv lub deformation ntawm cov khoom, widen lub firing kub, thiab ua kom lub ntsuab lub cev muaj ib tug tej yam dawb huv.

Metakaolin (MK luv luv) yog anhydrous aluminium silicate (Al2O3 · 2SiO2, AS2 rau luv) tsim los ntawm lub cev qhuav dej ntawm kaolin (Al2O3 · 2SiO2 · 2H2O, AS2H2 luv luv) ntawm qhov tsim nyog kub (600 ~ 900 ℃).Kaolin belongs rau txheej txheej silicate, thiab cov khaubncaws sab nraud povtseg yog khi los ntawm van der Waals daim ntawv cog lus, nyob rau hauv uas OH ions yog ruaj khov.Thaum kaolin cua sov hauv huab cua, nws cov qauv yuav hloov ntau zaus.Thaum nws yog rhuab mus txog 600 ℃, txheej txheej txheej ntawm kaolin yuav raug puas tsuaj vim lub cev qhuav dej, tsim ib tug hloov theem metakaolin nrog tsis zoo crystallinity.Vim hais tias cov txheej txheem molecular ntawm metakaolin yog qhov tsis sib xws, nws nthuav tawm lub xeev thermodynamic metastable thiab muaj gellability raws li kev zoo siab.

Metakaolin yog ib yam ntawm cov ntxhia ntxhia ua kua nplaum.Nws yog amorphous aluminium silicate tsim los ntawm ultra-fine kaolin calcined ntawm qhov kub thiab txias.Nws muaj cov kev ua haujlwm siab pozzolanic, feem ntau yog siv los ua cov khoom sib xyaw ua ke, thiab tseem tuaj yeem siv los ua cov khoom siv geological polymers.