Properties of Al contacts to Si surface exposed in the course of plasma etching of previously grown nanocrystalline c-BN lm, Journal of Telecommunications and Information Technology, 2005, nr 1

Properties of Al electric contacts to Si(p) surface exposed to fluorine-based plasma etching of nanocrystalline cubic boron nitride (c-BN) _lm grown previously were studied and compared to the properties of Al contacts fabricated on pristine or dry etched surface of Si(p) wafers. In addition, a part of the investigated samples was annealed in nitrogen atmosphere at the temperature of 673 K. Analysis of contract properties is based on current-voltage (I-V) measurements of the produced Al-Si structures. The presented investigations were performed in order to evaluate the efficiency of the applied plasma etching method of nanocrystalline c-BN from the viewpoint of its influence on the properties of metal contacts formed subsequently and thus on the performance of electronic devices involving the use of boron nitride

A tool for determining the number of bends and places of accumulation of potential wear of steel ropes operating in the luffing systems of basic opencast mining machines

This article presents the issues of the wear of steel ropes operating in the lowering systems of the largest wheel excavators (BWE), type SchRs, Rs, KWK operating in KWB Bełchatów. Sudden degradation of these ropes may lead to the complete shutdown of the BWE-Belt- Stacker system from operation. However, this can be avoided by regular visual inspections of hoist ropes. Unfortunately, the rope systems in each excavator are different, and their availability is difficult. In order to simplify this task, the authors of this paper have developed an IT tool that allows the modelling of a given multi-pulley rope system and the indication of critical places on the rope for given working conditions. A simplified description of this tool is the subject of the article

Zirconium – Based Ceramic Targets for Producing Nanocrystalline Coatings Resistant to Heat and Thermal Creep

score: 0collation: 89-9

Thermal Properties of Zirconium Oxide-Based Ceramic Targets Modified with Oxides of Rare Earth Elements

score: 0collation: 676-68

Use of Post-Flotation Solidified Tailings from Copper Production for Ceramic Tile Production

The development of the mining industry has resulted in the accumulation of large amounts of waste, which effectively degrades the environment. The aim of this study is to check whether the addition of post-flotation sludge from copper production to the typical ceramic mass of the “gress porcelanato” will allow to obtain qualified sintered or faience tiles. By adding successive amounts of post-flotation sludge to the high-quality lamellar mass, typical parameters such as firing shrinkage, water absorbability and bending strength after firing were assessed. The structure of the obtained ceramic materials, using scanning electron microscopy (SEM with EDS), was also determined. Obtaining positive results would allow not only to significantly reduce the production costs of ceramic tiles, because the sludge is finely divided and no grinding is necessary, but, above all, will allow to eliminate the environmental risk. The present study has shown that it is possible to introduce up to 20% post-flotation sludge for gres porcellanato tile production and up to 50% post-flotation slugde for faience tile production. Both types of ceramic materials with an appropriate proportion of sludge, meet the requirements of tile standards in terms of mechanical strength and water absorption

Some aspects on quantification of the wear at steel wire ropes 10(th) International Conference on Tribology - BALKANTRIB '20 Belgrade, Serbia, 20-22 May 2021

Steel ropes are widely used in material handling machines. The excessive wear of wires is often presented as a type of rope degradation. One of many indicators of the wear is abrasion, corrosion and fatigue cracks. Within this class of rope degradation, the main representation of wear is wire abrasion in the layers of the external wires. This is especially noticeable at the steel ropes which are operating in the drum devices with multilayer winding and in hoists of mining shafts. Over performed work cycles, the estimation of losses in rope cross-section is important for the calculation of the rope capacity. Abrasive wear of external wires is a relatively easy phenomenon to detect with a qualitative interpretation. However, it is a very difficult phenomenon to quantify. The aim of this article is to address this issue. A brief survey of usual methods for rope inspections is given, which can serve as practical guidance for the engineers in this field. With accompanying case study, it presented the advantages of magnetic method in rope inspections oriented towards measuring the changes of wires within the wear assessment

Study of the Properties of Al2O3-Ag Nanopowders Produced by an Innovative Thermal Decomposition–Reduction and Silver Nitrate Reduction Methods

score: 8collation: 13-1

Comparison between Polishing Etching of On and Off-Axis C and Si-Faces of 4H-SiC Wafers

score: 0collation: 597-60