Nanocomposites and nanomaterials

Regimes for solid bulk composite layers production of Cu alloy-based nanocomposites with the disperse oxides and carbides
Shcheretskyi V.O., Zatulovskyi A.S., Shcheretskyi O.A.
Composite materials Department, Physico-technological Institute of metals and alloys of the NAS of Ukraine. bul. Vernadskogo, 34/1, Kyiv-3142, Ukraine. 
E-mail: shcheretskyi@nas.gov.ua

There is investigated the influence of technological regimes on the composites samples’ density with nanoscale additions of carbide and oxide particles, obtained by the developed technology [1]. The composite layers are produced on the basis of micro-nanogranules consists of Cu10Sn1P and Cu9Al4Fe alloy powders and nano-particles additions which were previously fixed onto the surface of the metallic powders. The composite mixtures are subjected to preliminary hot pressing, and the subsequent heat treatment to form a strong adhesive bond and wide transition diffusion zone between the material’s layers.
The consolidation technology for the composite layers targeting nano-composite’s layer full density consists of pre-consolidation process, hot pressing and thermal treatment. The technology implementation need for optimal regimes to be developed 
For composite layer based on Cu10Sn1P, the optimal mode of pre-heat treatment is heating up to 450 ° C with a 15-minute exposure. For a material based on Cu9Al4Fe alloy, the optimal mode is heating up to 500 ° C with within 10 minutes.
Within hot pressing for the material based on Cu10Sn1P it has investigated the change of the compression pressing from 8 to 20 MPa with exposing time from 5 to 20 minutes, the layers’ porosity varies within 31-23%, the optimum hot pressing mode is stated to be load 17 MPa with 15 minute standby. The time and temperature of further furnace surfacing give layers’ porosity from 8 to 3%. The optimum mode for furnace surfacing is heating up to 1100 ° C. The hot pressing for the material based on Cu9Al4Fe, it was found that the optimal hot pressing mode is load 20 MPa with 10 minutes standby. The time and temperature of further furnace surfacing give layers’ porosity from 4,6 to 1,3%. The optimum mode for furnace surfacing is heating up to 1150 ° C with isothermal treatment 10 minutes.

1.	A.S. Zatulovskyi, V.O. Shcheretskyi, A.O. Shcheretskyi, Thermal stability of nanoscale oxides and carbides of W and Zr in Cu-Al-Fe alloy, Journal of Achievements in Materials and Manufacturing Engineering. -2018.-90/2.-P. 49-57.