Keyword: «electron microscopy»

The paper presents the results of studies of a material structure formed in the process of the developed technology for welding a saddle branch to a polyethylene pipe at low air temperatures. The temperature-time mode of welding saddles to a polyethylene pipe at low temperatures, implemented by the proposed technology, makes it possible to obtain a material structure that ensures the strength of the joint at the strength level of standard welding at permitted air temperatures.

A comparative analysis was conducted on the morphology and structural characteristics of primary particles in powders of natural nanodiamonds (NND) and detonation-synthesized nanodiamonds (DND), obtained by mechanical grinding and detonation synthesis methods respectively. The study employed high-resolution scanning electron microscopy techniques. Differences were observed in particle size, shape, and density defect between both types of powder. Interplanar distances and structural parameters of nanoparticles were determined. It was shown that NND nanocrystals are characterized by a wide variety of shapes and sizes, whereas DND particles demonstrate greater uniformity, although structural defects in the core of DNA particles occur more frequently.