Original paper(Vol.46 No.9 pp.1064)
Mechanical properties of glass coating
Itoh Yoshiyasu; Shindoh Takahiko
Abstract:In the high frequency electrodes composed of a metal substrate and a dielectric coating layer, it is important to develop a thicker glass coating technique for producing a dielectric coating layer for electric discharge parts.
In this study, a borosilicate glass coating and a 18 Cr stainless steel substrate were selected for the experiments to develop the multi-layered thick glass coating technique. The mechanical properties, such as Young's modulus, Poisson's ratio and cracking strain, of the coating with various glass thickness were measured at room temperature using a newly developed strain gage method. The experimental results suggested that the cracking strength decreased with increasing glass coating thickness due to an increase in residual stress at the glass coating surface.
Key Words:glass coating, Young's modulus, Poisson's ratio, residual stress, thermal expansion, fracture strain