Role Of Powder Research Articles

The Role of Powder Used in the Continuous Molding of Alloys

Abstract In this paper, a technology for obtaining powdery materials with special characteristics, in the metallurgical field, is presented. The compositions of these powders are from the calcium oxide - alumina - silica system, by adding CaF2, Na2O and C. The choice of oxide compositions will be made according to a series of parameters: the composition of the cast steel, the casting speed, the viscosity or the surface tension of molten steel.

Role of Powder in the Machining of Al-10%Sicp Metal Matrix Composites by Powder Mixed Electric Discharge Machining

This article reports the results of an experimental study conducted with the objective to understand the mechanism of material removal (role of silicon powder) in powder mixed electric discharge machining (PMEDM) while machining the Al-10%SiCP metal matrix composites. PMEDM is relatively a new development in the direction of enhancement of process capabilities of EDM. A new experimental set-up has been developed in the laboratory for experimentation. This research points out how the suspended powder helps in improving the performance of EDM. Further, the effect of the suspended powder and other selected parameters on process performance (machining rate (MR) and surface roughness (SR)) and subsequent optimal settings of the variables have been obtained using Taguchi method. The obtained experimental results indicate significantly improved performance of PMEDM over EDM. The appropriate addition of silicon powder into the dielectric fluid of EDM increases the MR and decreases the SR. The experimental results further indicate that the powder concentration, peak current, and pulse duration are the significant variables, while the supply voltage is an insignificant variable. The results were verified by conducting confirmation experiments with optimal process conditions.

Powder Compaction: Fundamentals and Recent Developments

The lecture reviews processes and mechanisms of powder compaction in dies, by cold or hot isostatic pressing, and by various other methods. The review will also include the hot and cold forging of powder preforms. Key problems of the main processes will be discussed, such as mass flow in the powder bed during compaction, which is required to achieve homogeneous density distribution in a part, or the role of powder lubrication.Applications of powder compaction are described using examples from such areas as the manufacture of sintered machine parts, high-strength automotive parts made by powder forging, the fabrication of mill shapes from powder (e.g., high speed steel or stainless steel tubing), and the production of aircraft engine parts by hot isostatic pressing.