Synthesis of Cu-CNTs nanocomposites via double pressing double sintering method

Abstract

In this research, copper (Cu)-carbon nanotubes (CNTs) nanocomposites were synthesized with different weight percentages of CNTs by double pressing double sintering (DPDS) method as well as conventional sintering method. A planetary ball mill was used to disperse CNTs in Cu matrix. The milled powders were first cold pressed to 450 MPa in a uniaxial stainless-steel die with cylindrical compacts (diameter: 12 mm and height: 5 mm). The effect of CNTs content and the DPDS method on the properties of the nanocomposites were investigated. The microstructure and phase analysis of Cu-CNTs nanocomposite samples were studied by FESEM and X-Ray Diffraction. The electrical conductivity of nanocomposites was measured and compared to both sintering methods. Mechanical properties of Cu-CNTs nanocomposites were characterized using bending strength and micro-hardness measurements. Enhancements of about 32% in bending strength, 31.6% in hardness and 19.5% in electrical conductivity of Cu-1 wt.% CNTs nanocomposite synthesized by DPDS method were observed as compared to Cu-1 wt.% CNTs nanocomposites fabricated under the similar condition by a conventional sintering process.

Tepki Yüzey Metodolojisi Kullanarak Alüminyum Matrisli Kompozitlerin Aşınma Parametrelerinin Optimizasyonu

“…AMK'ler sağladıkları bu avantajları nedeniyle havacılık ve otomotiv başta olmak üzere savunma sanayi ve birçok endüstriyel alanda yaygın olarak kullanılmaktadırlar. Özellikle otomotiv sektöründe, AMK'ler hafif olması nedeniyle ağırlığın azaltılması yönündeki çalışmaları desteklerken, aynı zamanda yüksek sıcaklık uygulamalarında da (piston ve silindir kapakları gibi) kullanılmaktadırlar [1,2]. Bu kullanım alanlarının yanı sıra iyi aşınma direncine sahip AMK'ler aynı zamanda otomotiv ve hava araçlarının fren disk ve kampanalarında da yaygın bir şekilde kullanılmaktadır.…”