Juliano Avelar Araujo

Texturização por Laser ND: YAG e comportamento tribológico de um recobrimento de cromo

A regular spaced array (texture) consisting of holes produced by pulsed Nd:YAG laser was designed in order to improve lubricant conditions of chromium eletro deposited layer upon mild steel. This surface textured was designed so that any hole behaves as an additional lubricant reservoir in boundary lubricant conditions. Metallographic and topographic analysis were performed and an analitical interpretation was proposed to describe tribological behaviour of this laser patterned (regular holes distribuition) and conventional (no laser treated) coatings. Tribological tests were performed accordingly to pin-on-disc procedure. A relevant increase in scuffing resistance was observed for texture coating: three times compared with conventional eletro deposited chromium layer. Better behaviour in wear tests (loss of mass) was also observed.

Influence of texturing by laser Nd:YAG in the tribological behavior of a chromium electro-plated coating on carbon steel

A regular spaced array (texture) consisting of holes produced by pulsed Nd:YAG laser, being designed in order to improve lubricant conditions of chromium electro deposited layer upon mild steel. This textured surface was designed so that any hole behaves as an additional lubricant reservoir under boundary lubricant conditions. Metallographic and topographic analysis were performed and it was proposed an analytical interpretation to describe tribological behavior of this laser pattern of regular holes distribution, for the conventional (no laser treated) coating. Tribological tests were performed according to pin-on-disc procedure. A relevant increase in scuffing resistance was observed for texture coating: three times higher when compared with conventional electro plated chromium layer. Better behavior in wear test (loss mass) was observed.A regular spaced array (texture) consisting of holes produced by pulsed Nd:YAG laser, being designed in order to improve lubricant conditions of chromium electro deposited layer upon mild steel. This textured surface was designed so that any hole behaves as an additional lubricant reservoir under boundary lubricant conditions. Metallographic and topographic analysis were performed and it was proposed an analytical interpretation to describe tribological behavior of this laser pattern of regular holes distribution, for the conventional (no laser treated) coating. Tribological tests were performed according to pin-on-disc procedure. A relevant increase in scuffing resistance was observed for texture coating: three times higher when compared with conventional electro plated chromium layer. Better behavior in wear test (loss mass) was observed.