Abstract
The results of studying the structure and properties of dispersion-strengthened composite materials of the Cu-Ti-C-O system obtained by reactionary grinding of copper powder with additions of titanium powder (0...5 wt%) and carbon in the form of graphite (0...1 wt%) in a high-energy ball mill of the attritor type in the presence of air. The regularities of the influence of titanium and graphite content on the hardness and electrical conductivity of the materials under study have been studied. It is shown that with an increase in the titanium content, the hardness increases and the electrical conductivity decreases. The hardness and electrical conductivity of materials under study dependences on the graphite content have the form of curves with maxima, which are observed at different values of the carbon content depending on the titanium content. By the method of X-ray phase analysis of the anode deposit of materials under study, it was found that the main strengthening phases are dispersion particles of titanium carbide. The composite materials under study of the Cu-Ti-C-O system, due to the combination of high electrical conductivity, hardness and recrystallization temperature, can be an alternative for replacing beryllium bronze in many fields.
Highlights
As materials for the manufacture of electrodes for electrical resistance welding of corrosion-resistant steels and heat-resistant alloys, as well as reinforcing nets and lattices of reinforced concrete products, in general, dispersion-hardened nickel-beryllium bronzes CuBe2NiTi are used [1,2]
The high toxicity [4,5] of beryllium provides for the introduction of restrictions in many countries, including Russia, on the use of beryllium bronzes, which are not recommended for use in newly developed or upgraded equipment
The data obtained confirm that composite materials of the Cu-Ti-C-O system in terms of the values of hardness and electrical conductivity can be promising in solving tasks of replacing beryllium bronzes and are of interest for further increasing the field of application
Summary
As materials for the manufacture of electrodes for electrical resistance welding of corrosion-resistant steels and heat-resistant alloys, as well as reinforcing nets and lattices of reinforced concrete products, in general, dispersion-hardened nickel-beryllium bronzes CuBe2NiTi are used [1,2]. They have high values of hardness (up to 240 HB) and hightemperature strength with sufficiently good electrical conductivity (up to 45% of the electrical conductivity of copper). With an increase in the aging temperature above 500 оС, Cu-Ti alloys rapidly soften due to the processes of coagulation of dispersion particles of the strengthening phase Cu4Ti [9,10]
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