Abstract
Glass/ceramic composite coatings were prepared on 40Cr steel matrix by thermo-chemical reaction with fly ash and a small amount of SiO2, Al2O3, MgO, and albite as main raw materials. On this basis, adding 10% Al-TiO2-B2O3 exothermic system, the morphology, phase, thermal shock resistance, and corrosion resistance of the coating were tested, and the influence of exothermic system on the structure and properties of the composite coating was studied. The experimental results show that the addition of exothermic system can promote the formation of NaB15, TiB2, Na2B4O7, Ca2Al2SiO7, and other new phases by thermo-chemical reaction; when compared to the composite coating without addition of exothermic system, combined with a good interface, higher compactness, and lower porosity. The highest micro hardness can be reached 725HV0.1. The number of thermal shock from 700 °C to room temperature can reach more than 50 times; acid, salt, oil immersion corrosion test, composite coating with exothermic system relative to the matrix increased by 27.40 times, 3.97 times, and 1.88 times, respectively. The overall performance is better than that of the composite coating without exothermic system.
Highlights
Fly ash is industrial waste discharged from coal-burning in power plants, and at an initial stage for China to make use of it
Su H.L. et al CaO-Al2 O3 -SiO2 system fly ash glass ceramics were prepared by sintering method with fly ash as the main raw material [7]
The results indicated that fly ash preparation of glass ceramics is viable [8]
Summary
Fly ash is industrial waste discharged from coal-burning in power plants, and at an initial stage for China to make use of it. Its application is distributed mainly in construction, agricultural production, and environmental treatment etc., but fly ash can bring higher added value [1,2,3]. Fly ash is mostly made up of ceramic phase and glass phase. It is viable to prepare glass-ceramic composite coating with fly ash as raw material [4,5,6]. Su H.L. et al CaO-Al2 O3 -SiO2 system fly ash glass ceramics were prepared by sintering method with fly ash as the main raw material [7]. Chen G.H. et al Fly ash was used to prepare glass ceramics, and studied the amount of fly ash, its preparation process, and the determination of its performance
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