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The Application of a Ball-milled Fe-Cu-Ni Powder Mixture to Fabricate Sintered Diamond Tools

Borowiecka-Jamrożek J., Konstanty J., Lachowski J.

Archives of Foundry Engineering

2018

Vol. 18, iss. 1

5--8

This article discusses results of an analysis of mechanical properties of a sintered material obtained from a mixture of elemental iron, copper and nickel powders ball milled for 60 hours. The powder consolidation was performed by hot pressing in a graphite mould. The hot pressing was carried out for 3 minutes at 900 °C and under a pressure of 35 MPa. The sintered specimens were tested for density, porosity, hardness and tensile strength. Their microstructures and fracture surfaces were also examined using a scanning electron microscope (SEM). The study was conducted in order to determine the suitability of the sintered material for the manufacture of metal-bonded diamond tools. It was important to assess the effects of chemical composition and microstructure of the sintered material on its mechanical properties, which were compared with those of conventional metal bond material produced from a hot-pressed SMS grade cobalt powder. Although the studied material shows slightly lower strength and ductility as compared with cobalt, its hardness and offset yield strength are sufficiently high to meet the criteria for less demanding applications.

Economical aspects of using diamonds and cobalt in production of diamond impregnated tools

Lachowski J., Borowiecka-Jamrożek J.

Logistyka

2011

nr 6

In the paper the analysis of dynamics of mining, production and market prices of cobalt was performed in the years 1900-2010. Cobalt is used as the basic material for matrices of diamond impregnated tools for cutting natural stones and building materials. Cobalt is characterized by an exceptionally good retention of diamond particles. Because of that there is high demand for cobalt and hence there remains a high price of that material. The possibility of substitution of cobalt with other cheaper alloys was considered, which as a matrix material would give similar functional properties with the lower costs of production.

W prezentowanej pracy przeprowadzono analizę dynamiki wydobycia, produkcji i cen rynkowych kobaltu na przestrzeni lat 1900-2010. Kobalt jest stosowany jako podstawowy materiał na osnowę w narzędziach metaliczno-diamentowych służących do cięcia kamieni naturalnych i materiałów budowlanych. Charakteryzuje się wyjątkowo dobrą retencją cząstek diamentowych. Powoduje to duże zapotrzebowanie na kobalt i w wyniku tego utrzymuje się wysoka cena tego materiału. Analizuje się możliwości zastąpienia kobaltu innym, tańszym surowcem, który jako materiał osnowy zapewniłby podobne własności użytkowe narzędzi przy niższych kosztach ich wytwarzania.