Powder Injection Moulding (shortly PIM) enables a high-volume production of completely metal or ceramic complex geometry parts starting from non-completely metallic and ceramic materials, frequently plastic feedstock. Four phases of the PIM technology are described (compounding of feedstock, injection moulding of plastic binder/metal powder, debinding of binder component and sintering) based on the material consisting of thermoplastic binder and metal powder. A feedstock polyacetal binder/low alloy steel powder was chosen and by injection moulding technology the injection molded product, called a "green part", is obtained. By this way, the "green part" (precisely, test specimen according to the ASTM E8/E8M-11 standard) is produced in Serbia for the first time. A feedstock characteristics (density, semi-quantitative analysis and visual appearance) and "green part "properties (mass, density, semi-quantitative analysis and visual appearance) were tested. It was concluded that satisfactory results were obtained.
In this paper the influence of the external high and moderate water pressure on the properties of the sealed thermoplastic assembly parts are described. The specimen made of the impact resistant polystyrene mark Styron 485, four sealing systems and indicator paper (placed inside the sealed parts) are used for the production of the mentioned assemblies. Specific white silicone mark Dow Corning, modified black silicone mark Permatex, encapsulating system mark Araldite consisting of a modified epoxy resin and amine hardener and the solution obtained by dissolving the polystyrene mark Styron 485 in toluene, are used. The produced assemblies were sink in the water at the depth of 4 m (high water pressure) and at the depth of 1 m (moderate water pressure) according to the SRPS EN 60068-2-17 standard. Based on the detailed inspection of the plastic parts in the assemblies and indicator paper, it was concluded that the water breakthrough did not happen and that all four applied systems prevented the water pass through the sealed assemblies. The tensile testing of the produced assemblies was done in order to establish a homogeneity of the used sealing systems in the mentioned assemblies. Based on the visual inspection it was concluded that white silicone (system 1), black silicone (system 2) and epoxy system (system 3) are homogenous in the produced joints, while at the joints with a polystyrene solution (system 4) a certain porosity is recorded.
This paper is dealing about the possibility of using thermoplastic material as an inhibitor for solid composite propellant in a long period of time. A basic point in this consideration is an analysis of bond characteristics between the extruded PVC tube and cast HTPB/IPDI rocket propellant examined immediately after the production of samples and after a long period of storage. Structure of poly(vinyl chloride), extrusion technology, hydroxy-terminated polybutadiene and casting technology are presented. Tested characteristics of samples of the extruded PVC tube-cast HTPB/IPDI propellant were bond strength and visual appearance of separated parts. Determination of the bond strength and visual appearance of samples were done at 20 o C and 50 o C. These characteristics of the extruded PVC tube-cast HTPB/IPDI propellant bond were determined at freshly prepared samples and at samples after five years of storage in warehouse conditions, at both above stated temperatures.
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