THE effect of laser treatment on operational properties of ESD coatings

Abstract. Ammonium nitrate(V) (AN, NH4NO3) is widely and widely used in the chemical industry, in agriculture as a fertilizer, explosive for military and civil purposes (e.g. in mining) or as a solid propellant [1, 2]. Storage of ammonium nitrate poses many problems, as it may be hazardous. This was proven, for example, by the explosion in 2020 in Beirut. Ammonium nitrate was stored in a warehouse at the port among other wares and an unfortunate turn of events caused a huge explosion. The explosion contributed to the formation of a 140-meter crater and an earthquake with a magnitude of 3.3 on the Richter scale. This explosion was classified as the third most destructive urban explosion of all time, after the atomic bombs in Hiroshima and Nagasaki at the end of World War II [3, 4], as the mixtures of oils (fuel or gas) and a concentrated form of nitrogen fertilizer  ammonium nitrate form explosives [5]. The dangerous properties of AN have been extensively studied. It is known that pure AN is stable at room temperature but may explode when mixed with impurities in a confined space or under fire-hazard conditions [1]. The research aimed to analyze the changes occurring in two-component mixtures with ammonium nitrate and powdered or fine-grained materials and to assess the effect of such an admixture on the fertilizer. Thermal analysis was used to carry out the TG-DSC tests.

Section: Discussionmentioning

confidence: 99%

Thermal Stability of Ammonium Nitrate in Two-Component Mixtures with Powdered and Fine-Grained Materials

DYSZ

2023

“…Their technological properties can be adjusted towards desired values by applying appropriate protective coatings [30][31][32] or modifying the surface layer [33]. Here, increasingly popular techniques such as electrospark deposition [34][35][36] and diamond-like carbon coatings [37][38][39] can be mentioned.…”

Section: B) A)mentioning

confidence: 99%

Experimental Results of Helical Metal Expansion Joints Fabrication

KURP

2023

Abstract. This paper discusses the technological assumptions for the production of helical metal expansion joint as a new type of expansion joints used to eliminate torsional deformations of industrial pipelines. The method of mechanically assisted laser forming, which was used as a manufacturing technology, was presented as well. Furthermore, technological parameters and experimental results obtained during the fabrication of helical metal expansion joints were presented. Mainly presented and discussed are the results such as: obtained geometry, forces necessary to produce the product, processing temperature, strain rate and others. Satisfactory treatment results were obtained, which are illustrated below.

“…Such an approach often requires organizational changes [15], the development of new failure mode and effects analysis scenarios [16][17][18], and the implementation of precise measurement and control techniques [19]. Rapid prototyping has a wide range of applications and often involves the application of special coatings [20,21], including DLC [22][23][24] or electrospark deposition [25,26], modification of the morphology of the surface layer [27], or welding joints [28]. The presented article introduces a prototype of a flexible cup for a harmonic drive, which due to its significant possible gear ratios and high precision, can find applications in hydraulic control [29][30][31] and the military sector [32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Geometrical Accuracy of Flexspline Prototypes Made by FDM/MEM Methods

PACANA

2023

Abstract. This article presents an analysis of the geometrical accuracy of flexspline prototypes that were a component of harmonic drive. To produce the test models, a MEM (Melting and Extrusion Modeling) method was used. This additive method allows the production of elements with very complicated shapes from various polymeric materials. As the test model, a flexspline made of ABS (acrylonitrile-butadiene-styrene) was assumed. Such a special gear with a complicated construction was chosen, because its unique design allows one to obtain clear conclusions from the analysis. To expand the scope of research, models of flexspline with four different construction solutions were made and tested. As a step of the analysis, contact measurements were performed for several flexspline models on the coordinate measuring machine to check their dimensions. The verification of the geometrical accuracy of flexspline models will allow to assess the usefulness of additive methods for the production of prototypes and finished products.