Design and technological optimization of rubber-reinforced thin-layer movable joints in the structure of a pipeline vibration-isolating compensator

Thin-layer rubber-metal elements have been widely used in various fields of technology, including helicopter construction, support parts for bridges, shock absorbers in industrial and civil construction. Their work reliability is determined by the design and technological performance features, which require experimental testing and parametric optimization. The article presents the samples and basic models testing results which were aimed at increasing the strength indicators stability of the adhesive ``rubber-metal'' joints and ensuring the failure-free operation of a rubber-metal product in the structure of a pipeline vibration-isolating compensator.

An Eastern Toreutics Item from Novosibirsk

Purpose. The article dwells upon the description and interpretation of a unique anthropomorphic Eastern toreutics item that was discovered by accident on the territory of Novosibirsk. This item comes from the traditional Ob river crossing site where a cult place with References to the Early Iron Age has already been identified. The study is aimed at attributing the imported item in terms of historical and cultural as well as material science aspects and establishing its relative chronology and possible intended purpose. Results. The functional purpose of the artifact is considered in terms of both its initial origin and possible use in the local environment. The structure and origin of the clothes depicted on the toreutics item are analyzed as being one of the most insightful elements of the cultural background of the product. Based on these data, an assumption concerning an image of silk clothes on the figure was made. Special attention was given to characteristics of a dynamic nature evoked by a volumetric depiction of the tiny sculpture that is likely to correspond to a ritual dance. The established direct and indirect analogies for the toreutics item from Novosibirsk allow state its Eastern origin related to the consequences of the impact of the ancient culture on the vast Eurasian territories. The anthropomorphic product has obvious features of a Buddhistic background represented by an image of the point on the figure's forehead. The energy-dispersive analysis of the metal product allowed determine an alloy composition. It comprised of 62.1 % copper, 15.3 % tin, 15.2 % lead, and 7.4 % zinc. Conclusion. The share of tin in the alloy allows it to be identified as a ‘classic’ bronze piece. An extensive share of copper in the metal product brings it closer to the formula of ancient bronze. The item dates back to the turn of the epoch and is likely to be related to the Indian and Greek cultural tradition.

Smelting Reduction of Spent Catalyst Containing Nickel: A Preliminary Study

The aim of this research was to study the recycling process and the feasibility to smelt the spent nickel catalyst for the production of nickel alloy or ferronickel. The smelting process was carried out in a laboratory induction furnace. The effects of SiO2/CaO for slag forming on metal recovery and smelting time were investigated. Petroleum coke was used as reductant. Mill scale was used as an iron resource for ferro-alloy production, while CaO was used as slag forming agent. The raw materials were mixed together and put into a graphite crucible, which was then placed in the induction furnace. After the melt was completed, the melt was poured into a mold to solidify. The chemical composition of the product was analyzed by XRF and XRD. It was found that the smelting time was decreased with increasing SiO2/CaO from 1.0 to 2.3. For nickel alloy production, increasing of SiO2/CaO increased the weight of metal product. For the ferronickel production, however, the weight of metal product was found not to vary with different ratio of SiO2/CaO.

Integrated processing of ferriferous materials in blank production for mechanical engineering facilities

The paper considers the possibility of reducing the use of crude ore for metal product by using aluminothermy, which facilitates effective integrated processing of metal waste generated by engineering and metallurgy facilities in the form of mill scale, ferrous and non-ferrous metal swarf with simultaneous castings production. The paper studies the impact patterns of thermite components ratios on the parameters of extracting chemical elements from the source components, metal phase output and its chemical composition. The possible applications for experimental alloys resulting from controlled exothermic reactions are determined for supplying castings and melting stock to blank production for mechanical engineering facilities.