Structure and Properties of Steels and Non-ferrous Metals

Development (fabrication& characterization) of new Cu nanostructured & nanoceramic-Cu .composites Heider Yasser Thamir; PhD student :Supervised by Dr. M. J. Kadhim Dr. A. SH. Jabur

SUMMARY & AIM OF RESEARCH During recent years, nanomaterials have received increasing attention in advanced technology due to their outstanding mechanical, physical& chemical properties compare with their corresponding bulk counterparts.

. These properties are affected by many parameters such as size, surface area, shape, chemical composition, morphology& structure. Therefore, detailed studies should be taken place to investigate new nanostructured materials. Because of their high electrical& thermal conductivity, copper& its alloys have

found widespread applications, such as resistance welding electrodes, high voltage switches, motor commutators, continuous casting moulds& others. The required properties of these products are the high mechanical properties& high electric& thermal conductivity. Also, its often required that properties remain stable

in different operating conditions,& often also that they are resistant to variant force, current& thermal loads. Some compromise in this regard can be achieved using precipitation hardened alloys. However, a serious drawback of these materials is instability of their mechanical properties& electric& thermal conductivity

at elevated& high temperature, resulting from temperature instability of their microstructure. Therefore, a rising trend to use new copper-based functional materials, such as materials dispersion-hardened, usually by the particles of oxides, carbides& others, obtained by powder metallurgy techniques..

Within this group of materials particular attention is being drawn to those of nanometric size copper matrix grains & ceramic particles :The aims of this study production & characterization of- 1 .nanosize copper powders study the effect of powder technology- 2

:parameters on a- powder technology nanograins copper .products b- the effect of nanosize ceramic powder.cu composites by powder technology Plan of research :The study includes production & characterization of- 1 .nanosize copper powders

study the ability of controlling the- 2 nanosize copper powders' properties like particle size, particle size distribution, shape, morphology, etc. through controlling the parameters of synthesis .method(s) fabrication & characterization of- 3 powder technology products based on

.nanosize copper powders fabrication & characterization of- 4 powder technology nanosized ceramic .powder-cu composites :The synthesis techniques include chemical vapor deposition- 1 physical vapor deposition- 2 cryogenic ball milling- 3

flame spray reactor- 4 hydrolysis- 5 two phase approach (reduction reaction- 6 inside block copolymer micelles) solvothermal, or hydrothermal- 7 :The characterization includes mechanical properties such as hardness- 1 .& compression strength

.electrical & thermal conductivity- 2 Structural studies using: optical,- 3 scanning& transmission microscopes, .DTA & DSC compositional changes using EDS &- 4 .WDS Phase analysis using X-ray diffraction- 5 .& X-ray step scanning

The End Thank you for your attention