State-of-the-art melting of tantalum and tantalum alloys has relied on electron beam (EB) or vacuum arc remelting (VAR) for commercial ingot production. Plasma arc melting (PAM) provides an alternative for melting tantalum that contains very high levels of interstitials where other melting techniques can not be applied. Previous work in this area centered on plasma arc melt quality and final in...

One of the ultimate goals in particle accelerator cavity design is to establish a model that integrates the grain orientations of an ingot slice, slip activity during deep drawing, and dislocation substructure evolution because of slip system interactions, which governs subsequent recrystallization. In order to understand the slip behavior during deep drawing of large grain Nb, it is fi rst nec...

Bangka brand (BA) tin metal bar (ingot) has the highest defect percentage value of 2.01% from June to September 2021. This exceeds minimum non-conformity product standard 0.25 %. study aims identify types and factors that cause defects propose improvements for quality products. The research uses six-sigma method with DMAIC stages. Types ingot include winging, rough surface, curved edges, bumps ...

To further improve the metallurgical quality of electroslag remelting, remove large inclusions in ingot and refine solidification structure ingot, an remelting furnace with electromagnetic stirring was designed, influence different magnetic induction intensities on GCr15 studied. Inclusions sizes types were analyzed by ASPEX scanning electron microscope, morphology composition observed a JSM-65...

In an attempt to correlate the performance of superconducting radiofrequency cavities made of niobium with the superconducting properties, we present the results of the magnetization and ac susceptibility of the niobium used in the superconducting radiofrequency cavity fabrication. The samples were subjected to buffer chemical polishing (BCP) surface and high temperature heat treatments, typica...

A specially designed lifetime measurement instrument has been developed to characterize silicon ingots before they are subjected to expensive slicing and solar-cell processing, thereby saving needless processing costs of inferior materials in a solar-cell production line. The instrument uses the direct-current photoconductance decay (DC-PCD) method for linear detection of the transient photocon...

BACKGROUND Awareness about lead poisoning in South Korea has increased; however, occupational exposures occurring in small-scale businesses have not been thoroughly investigated. We report two cases of high lead exposure in a leaded bronze ingot foundry. CASE PRESENTATION Two employees, a 54-year-old primary operator and a 46-year-old assistant, at a small-scale metalworking company who had b...

In the framework of the ESS activity in progress at INFN-LASA, we are designing and developing 704.42 MHz Medium (β=0.67) and High (β=0.86) beta prototype cavities plug compatible with the ESS cryomodule design. The cells of one Medium and one High beta cavity are fabricated with high quality CBMM Large Grain Niobium (480 mm dia. Ingot, RRR=300, sliced by Heraeus) while a Medium beta cavity is ...

Strengthening the crystal lattice of lanthanide halides, which are brittle, anisotropic, ionic crystals, may prove to increase the availability and ruggedness of these scintillators for room-temperature gamma-ray spectroscopy applications. Eight aliovalent dopants for were explored in an effort to find the optimal aliovalent strengthening agent. Eight dopants, , , , , , , , and , were explored ...