Hadisur Rahman* and Mst Ummul Farah
With rapid globalization, consumerism, industrialization and greenhouse gas emission, the world's temperature is skyrocketing day by day which leads to climate change. Chemical, construction and textile industries are the biggest sources of environmental pollution, and thus sustainability issues are rising. The present world is going through several problems like overpopulation, poverty, greenhouse gas emission, and environmental pollution. Wastages like household wastages, municipal wastages, different synthetic polymers, thermoplastic wastes etc. have become a global problem. Every year, 300 million tons of plastic are being produced worldwide. Land fields, oceans, and the air are being polluted by plastic during and after the manufacturing processes. So, cultivation, human health, wild and marine lives are under threat. At present, harmful plastic can be converted into our resources by proper utilization. Proper utilization of these wastes will be beneficial in terms of both environment and the economy. This study focuses on manufacturing bricks from these wastes (Polyethylene, Polyethylene Terephthalate) as a way for the conversion of waste into resources. In the case of performance, the strength of the developed brick is very good and durable in comparison with the traditional one, as well as economical.
Sustainability • Thermoplastic • Wastage • Polyethylene • Polyethylene terephthalate • Brick • Strength
Cherepanov A.N and Manolov V.K*
The review presents the results of experimental and pilot industrial studies on the use of nanosized powders of refractory compounds in metallurgical and foundry industries. The main attention is paid to the presentation of the results of studying the effect of nanodispersions on the formation of the structure and mechanical properties in cast products from alloys based on iron, aluminum, and nickel. Using metallographic studies, it was found that small additions of nanomodifying powder compositions in an amount not exceeding 0.1% by weight significantly refine the structural components of the cast metal and increase its mechanical and operational characteristics. Thus, the nanomodification of heat resistant nickel based alloys makes it possible to increase the long term strength, plasticity, and thermoscyclic characteristics of prototypes (by a factor of 1.5–3). During nanomodification of aluminum alloys, a refinement of crystalline grains, including segregations of primary Si, and a decrease in porosity (up to 60%) are observed. Nanomodification has a significant effect on the structure and properties of the metal in the continuously cast steel ingot. The central porosity decreases (by 25%–36.7%), as well as the general chemical heterogeneity (by 39.8–75%), liquation, and general fracturing (by 34%–100%). The zone of equiaxed crystals and the mechanical properties of the cast metal increase.
Nanopowders • Casting production • Aluminum alloys
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