The Mechanism On The High Temperature Corrosion Of Glass

Glass is well known for its high transparency,good corrosion resistance,and reliable mechanical property.However,corrosion often occurs in glass during long term service,which restricts the widely application of glass.Recently,glass corrosion has attracted increasing attentions;whereas,the high temperature corrosion of glass still remains a challenge.On the other hand,the refinement of aluminum requires the development of new rotor materials.The recent work of our group found that a glass coating on the surface of graphite can significantly reduce the abrasion of graphite.However,the high temperature corrosion of glass in aluminum melt is not clear by now.Therefore,this work focuses on the high temperature corrosion of Ca-Al-B-Si glass under different environments.The results show that the glass remains in amorphous state at 700?.During the high temperature corrosion,the content of Sr ions decreases rapidly,and the content of other ions in glass decreases gradually with the increasing corrosion time.The corrosion behavior of glass in aluminum melt is similar to that in air and humidified N2.On the other hand,the effect of nitrogen dopant on the corrosion of glass in aluminum melt has also been investigated.The results show that the high temperature corrosion of glass in aluminum melt leads to the formation of a diffusion region at the interface between glass and aluminum melt.The thickness of this diffusion layer increases with time,which indicates it diffusion-controlled nature.In addition,the inclusion of nitrogen in glass effectively prohibits the formation of diffusion layer.Moreover,the glass corrosion in aluminum melt causes the formation of few silicon-enrichment regions,which might not significantly change the properties of aluminum.