Friction and Wear Characteristics of WC and TiCN-coated Insert in Turning Carbon Steel Workpiece

AbstractTitanium Carbo-Nitride (TiCN) coating is widely applied in industry to improve the wear resistance of surfaces, such as for cutting tools, mould and dies, aerospace components and machine elements. It has high hardness with superior chemical and thermal stability. In this work, the turning performance was conducted at cutting speed of 60mm/min, feed rate of 0.06mm/rev and 1.0mm depth of cut, on carbon steel workpiece. The wear behavior of TiCN-coated WC and uncoated WC cutting inserts were investigated using field emission scanning electron microscope equipped with energy-dispersive X-ray analyzer. The tribological characteristic of the sample was evaluated on a pin-on-disc tribometer. TiCN-coated cutting tool inserts were subjected to turning of hardened carbon steel at 50mm/min, depth of cut at 0.5mm and feed rate at 0.06mm/rev under dry turning condition. It was observed that TiCN coating thin film deposited on cutting tools have reduced the friction coefficient, increased microhardness and subsequently improved cutting tool life as compared to uncoated cutting tool inserts

Effect of Sintering Cycle on Physical and Mechanical Properties of Open Pore Cell Copper Foam

AbstractPoor thermal management leads to high LED junction temperature and give negative impacts to its life and performance. High temperature of LED junction has proven to produce less light and accelerate chip degeneration. Open pore cell copper foam provide good solution to the poor thermal management problem since it has higher surface area, thus increase surface emissivity and enhance thermal conductivity. In this study, copper foams were fabricated using metal injection moulding using potassium carbonate as space holder. The effect of sintering cycle on physical and mechanical properties were studied using two different sintering cycle which are 450-850°C and 450-850-950°C. It is found that sintered copper foams using 450°C-850-950°C sintering cycle has better mechanical properties in term of hardness and transverse rupture strength. It also exhibited higher porosity which is up to 33.9% compared to 33.1%, thus has higher surface area. This is proven by higher thermal conductivity exhibit by the specimen sintered using 450°C-850-950°C