Prestressed coating technology is used to improve the strength of building ceramic tiles produced from iron tailings.The effects of the composition of diopside coating and technological parameters,such as coating thickness and holding time and milling time,on flexural strength of the coated composite samples were studied.It is found that the optimal composition of diopside coating consists of 32 wt.％dolomite,56 wt.％quartz and 12 wt.％alumina.As compared with that of the uncoated substrate(103.23 MPa),the flexural strength of the composite sample is increased by 31.95 MPa(30.95％).With increasing coating thickness,flexural strength of the composite sample increases first and then decreases.When the coating thickness is 196.45 μm,the strength of the composite sample is the highest(143.54 MPa),while the flexural strength of the composite sample is increased by 40.31 MPa.The increase in the flexural strength is 39.05％,as compared with that of the substrate.When the milling time of the coating material is 5 h,the diopside coating calcined at 1200 ℃ for 0.5 h has the highest strengthening effect.Flexural strength of the double-sided coating composite building tiles from iron tailings reached 148.51 MPa,which is 45.28 MPa higher than that of the substrate,with an increase rate of 43.86％.
关键词
建筑陶瓷/预应力涂层/透辉石/抗折强度
Key words
building tiles/prestressed coating/diopside/flexural strength
维普
万方数据