Damage Mechanism of Particle Impact in a $Cr_2O_3$ Plasma Coated Soda-lime Glass

J. Ocean Eng. Technol. 1998;12(3):49-59.

Suh, Chang-Min;Lee, Moon-Whan;Kim, Sung-Ho;Jang, Jong-Yun;

$Cr_2O_3$ 플라스마 용사 코팅된 유리의 입자충격에 의한 손상기구

서창민;이문환;김성호;장종윤;

경북대 공대;구미 전문대학;경북대 대학원;포항 전문대학;

Keywords: plasma coating, particle impact, damage relaxation, ring crack, cone crack, radial crack, lateral crack

핵심용어: 플라스마 코팅, 입자충격, 손상완화, 링크랙, 콘크랙, 레디얼크랙, 레터럴크랙

Abstract

The damage mechanism of $Cr_2O_3$ plasma coated soda-lime glass and uncoated glass by steel ball particle impact was analyzed in this study. And the shape variation of the cracks was investigated by stereo-microscope according to the impact velocity and steel ball diameter. In order to improve the damage reduction effect by $Cr_2O_3$ coating layer, crack size was measured and surface erosion state was observed for both of two kinds of specimen after impact experiment. And the results were compared with each other. The 4-point bending test was performed according to ASTM D790 testing method to evaluate the effect of coating layer for bending strength variation. As a result, it was found that the crack size of $Cr_2O_3$ coated specimen was smaller than that of uncoated one, because of the impact absorption by interior pores in the coating layer and the load dispersion by the structural characteristic of the coating layer. For the specimens subjected to the steel ball impact, the bending strength of coated specimen was higher than that of uncoated specimen.