Development of heat- and wear-resistant nanocomposite copper powder based material and technique of its obtaining used for plungers of die-casting machines

摘要

This paper presents the chemical composition, technology of manufacture and the basic properties of the nanocomposite Cu-Al-C-O copper powder based material for plungers of die - casting machines developed by the authors. The technology is based on the method of reactionary mechanical alloying in the attritor, which provides the formation of a dispersion-strengthened subgrain structure of the material containing strengthening particles γ-Al2O3 with an average size of 39±7 nm. Its recrystallization temperature is 1000 ± 20 °C, and the hardness in the test temperature range of (20-800 °C) exceeds the hardness of standard bronzes, in particular, CuBe2NiTi, CuA110Fe4Ni4 and CuA110Fe3Mn2, widely used in plungers of such foundry equipment. The developed material has a low wear intensity (3.20 ± 0.85)·10~(-11) and, in contrast to the above bronzes, it can be used at an extremely high (up to 115 MPa) pressure between the plunger and the steel pressing chamber.