Preparation And Properties Of Glass-ceramic Composite Coating From Fly Ash

Glass/ceramic composite coating is prepared with composite powers,which are respectivelymixed by fly ash,Al,SiO₂-Al₂O₃-MgO,albite,Al-TiO₂-B₂O₃and so on. XRD and SEM are usedto characterize the composition and morphology of the ceramic coatings. The ceramic coatings’corrosion, wear resistance, erosion and abrasion resist-ance are also tested.The results show that ordinary fly ash coating is better than that of high aluminum fly ashcoating.Glass/ceramic composite coating is prepared with fly ash,adding Al,SiO₂-Al₂O₃–MgOand albite. Ca₂Al₂SiO₇,FeAl₁₃,Mg₃（PO₄）₂and NiFe₂O₄are generated within the coatings afterheated. The acid, saltand oil medium corrosion of the composite coating are increased17.8,1.30and1.71times respectively. Abrasive wear relative to the matrix raise6.80～10.25times.Adding10%Al-TiO₂-B₂O₃exothermic system into former coating formulation,and thecoatings contain Na₂B₄O₇,TiB₂,NaB₁₅and Al₂O₃new phases. The acid, saltand oil mediumcorrosion of the composite coating are increased27.4,4.00and1.88times resp-ectively.Abrasive wear relative to the matrix raise8.33～14.83times.Erosion wear and corrosion wear of SiO₂-Al₂O₃-MgO glass/ceramic composite coatingrelative matrix are increased by2.03～2.95times,1.27～1.99times respectively. Erosion wearand corrosion wear of glass/ceramic composite coating with Al-TiO₂-B₂O₃are increased by2.56～3.86times,2.15～2.44times respectively.