Chromium nitride-coated copper beryllium as a cam tappet material candidate

Abstract

Copper beryllium (CuBe) with good mechanical and high electrical conductivity properties is used in metalworking, electronic devices, automotive systems, and aerospace systems. Having low hardness limits its usage in tribosystems such as internal combustion engine valve train systems. In this study, heat-treated CuBe material was coated with CrN under a micron thickness by cathodic arc physical vapor deposition (arc-PVD) to improve wear resistance not only at unlubricated condition but also at the lubricated condition for tribosystem, especially a material candidate for cam tappets. Therefore, CrN-coated CuBe, CuBe, and AISI52100 steel samples were tested by a tribometer at unlubricated and lubricated sliding conditions. Surface morphological changes and tribochemical formation were investigated by optical microscope, optical profilometer, atomic force microscope, and scanning electron microscope. The results showed that CrN increased the wear resistance of the CuBe significantly, and it can be used as cam tappet material both on unlubricated and boundary lubrication regimes.

Interfacial Reaction between SAC3807 Lead-Free Solders and Different Copper Substrate via Reflow Soldering Process

“…However, the beryllium (Be) element is not easily detected in the alloys, and the limitation element of interest may be present below the detection limit of EDX, typically about 0.2-0.5% [9]. According to Ozkan & Turkuz [11], Be element had identified with Raman analysis on bare copper-beryllium surface. The peak between 510 and 540 cm -1 wavelengths corresponded to CuO, and at the peak of wavelength 610, 1080, and1180 cm-1 show the oxidation state of Be as shown in Figure 1.…”

“…1. Raman analysis of bare Cu-Be [11] This study will aim to investigate an interfacial reaction between SAC3807 solder and Cu and Cu-Be substrates. The melting point for SAC 3807 is 217°C [10].…”