Особенности компактирования в пресс-формах композиций на основе углерода и вольфрама

Abstract

This paper presents an analysis process based on the properties of the powders of carbon and tungsten, and methods for producing semi-finished products of them. It was revealed that the most common and effective way is to compaction of powder compositions of tungsten and carbon in press-dies. Carbon and tungsten powders have a several special properties that significantly affect the quality of semi-finished and require special organization of the production cycle. Thus the self-diffusion coefficients of the low carbon and tungsten, a high elastic modulus require plasticizers and binders, for acceptable strength of semifinished after compaction . High adsorptive capacity of the powdered compositions, is the cause of low pour density and a large amount of gases which must be removed from the press-die cavity during the compaction. Speeds punch during compaction tungsten limited 2 – 2.5 mm/s, the preform obtained by compacting high speeds have defects such as cracks. For continuous preparations of graphite requires prolonged high-temperature processing. Powder compacting after harvesting have significant porosity and require further thermomechanical processing.