Monitoring of metal powder by eddy current

Abstract

Nanocrystalline Fe(1?x)Cox, Fe, Fe80N120,Cu70Fe18Co12 mixtures have been prepared by mechanical alloying using a planetary ball mill under several milling conditions. Their structures and magnetic properties were investigated. Mechanical alloying is a non-balanced process for synthesis materials. The structural effects of mechanical alloying of powders were investigated by scanning X-ray diffraction analysis. In this report, we examine the applicability of eddy current techniques in-process for monitoring of powder density particle size and the time necessary to structure variation. An eddy current based monitoring system developed to measure metal powder density is expanded for monitoring metal powder diameter in metal compounds. Experimental sensor readings were gathered using four different metal powders with known particle sizes Fe(1?x)Cox, Fe, Fe80N120 and Cu70Fe18Co12. Analysis of the data showed that the sensor output was in relation with different parameter of powder (diameter, density and structure) that the sensitivity of the sensor differed with the type of metal powder. The merit of this technique is its reliance on a simple and inexpensive sensor probe.

Structure, magnetic and microwave studies of mechanically alloyed powders Fe45Ni35Co20

“…When the dissolved atoms are dissolved in the solid solution, this tends to increase the hardness (the powder becomes more regular) [16]. The accumulation of strain energy during MA (by increasing milling times) tends to increase the microhardness value [3, 17]. The behaviour of the dislocation is inversely related to the macroscopic grain size.…”

“…It is known that Fe–Ni alloys are kinds of important soft magnetic materials, which have wide application in the field of electronic devices and industry. Fe–cobalt (Co) alloys soft magnetic materials have the highest saturation MS, as well as high Curie temperatures, making these alloys suitable materials for high‐temperature application [3]. Properties vary over composition range; optimum composition must be selected for a particular application.…”

Simulation of Cracks Detection in Tubes by Eddy Current Testing

“…It can be used such as perfect tool to characterize defects in materials [4]. However, the sensitivity of the characterization process is highly dependent on the probe choice and the operation frequency [5].…”