Obtaining and Investigation of Hard Alloy Billets from Powders, Receiving by Electro Spark Dispersion of Tungsten-Contained Waste

Abstract

There were presented results of research of billet of hard alloy (HA) from powders, obtaining by electro spark dispersion (ESD) of tungsten-contained waste of alloy trade mark T15K6. For manufacturing of HA-powder from waste was used plant for ESD conductive materials. As working liquid in its reactor was used distilled water and lighting kerosene. Process of dispersion was conducted at the following parameters: energy discharge capacity capacitance 35 μF, voltage 200–220 V, pulse recurrence frequency 30 Hz. Experiments proved that HA-billet as result of cold isostatic pressing at pressure 300 MPa and subsequent sintering at vacuum at temperature 1500 °C during 2 hours of powders, obtaining from waste by means of ESD, have in comparison with industrial hard alloy of trade mark T156K more porosity (by 4,22–9,22 times), less grain sizes (by 1,5–3,0 times), more high density (by 5 %), less crushing stress (by 1,2–3,2 times) and more micro hardness (by 1,2 times).