Structure and Tribological Characteristics of HVOF Coatings Sprayed from Powder Blends of Cr_3C_2-25NiCr and NiCrBSi Alloy

摘要

HVOF spraying was used to prepare coatings from mechanical blends of Cr_3C_2-25NiCr and NiCrBSi powders. The aim of this study is to study the tribological behavior of coatings prepared from such powder blends. The coatings were studied under dry sliding conditions particularly at high temperatures. Tribological properties of the coatings were characterized using a specific hot-button tribological tester at the temperature of 300℃ in air, and a pin-on-disk test at room temperature. Addition of NiCrBSi resulted in coatings, which showed low coefficient of friction in high temperatures, and in high levels of contact pressure and sliding speed.