Effects of Electron Beam Irradiation on Impact Value of Borosilicate Glass

The effects of homogeneous irradiation of electron-beam (EB) with low voltage oil the Charpy impact value (a(uc)) of borosilicate glass were studied. When it performed in short bursts to maintain a low temperature, EB irradiation at a dosage front 0.04 to 0.22 MGy increased the a(uc) value and enhanced its reproducibly. Based oil the electron spin resonance (ESR) spectra, EB-irradiation formed apparent dangling bonds constructed with sodium atoms with high density of outer-shell electrons and terminated oxygen atoms of silica network in the borosilicate glass. When the intermolecular repulsive force generated the partial relaxation against residual and deformed strain. as well as expansion in front of crack lips near the sodium atoms. the initial a(uc) enhancement of the borosilicate lass by the irradiation can be explained. Furthermore. the strong, resistance to radiation damage of borosilicate glass was qualitatively confirmed. Although the large start point of irradiation dose to decrease the a(s) value was 0.08 MGy for silica glass, it was 0.22 MGy for borosilicate glass. Consequently. the boron addition enhanced the resistivity to irradiation damage. [doi:10.2320/matertrans.MAW200914]