The structure and properties of the glass-ceramics were tested with X-ray dif-fraction testing instrument,correlative software,and other modern testing means.Then the effect of Al2O3 content on internal stresses in CaO-Al2O3-SiO2 glass-ceramics was studied deeply.In order to study the relationship of Al2O3 to the residual stress of CaO-Al2O3-SiO2 glass-ceramics,X-ray dif-fraction "sin2ψ" was used.The means utilized the x radial incidence produced from cathode radial tube,and took the space between crystals as measurement of strain.When the stresses produced,the space between crystals changed and the diffraction peak moved during Bragg diffraction.The magnitude of movement is related to the stresses.The experimental results show the residual stress is considerably high and Al2O3 can influence the mechanical properties of this material hugely.
The samples were attained through altering the cooling system of producing glass-ceramics. The X-ray diffraction was used to test the stress value of different samples.The relation of the cooling system and internal stress were also investigated.The experimental results show that the stress of glass-ceramic had a close relation with starting cool temperature.Above 800℃,glass-ceramic could be accelerated cooling and did not bring stress.Temperature between 500℃and 800℃was an important temperature range of the formation of stress in glass-ceramic,in which the glass-ceramic stress would change obviously.Cool system was the key on how to control and eliminate internal stress in order to reduce the destroy of materials crated by internal stress.In addition,glass particles size increase,glass-ceramic stress increase in consequent.
