Internal oxidation of Cr in Cu–Cr/Cu2O composite powder prepared by mechanical activation

The formation kinetics of Cr2O3dispersed Cu synthesized by Cryo-milling

“…The heat capacities of the phases involved are listed The thermodynamic calculation was also done for the reaction (2), (3), and (4), respectively; the adiabatic temperatures for each reaction (1-4) are presented in Table 1. The estimated adiabatic temperature of the reaction (3,4) drops significantly by adding extra Cu powder for the heat sink effect of the inert element (Cu). Moreover, reducing the chance of direct contact for the reactants by the addition of Cu powders would give a rise to the delay of incubation time (t ig ).…”

“…As suggested by Groza in early 1990's [2], the prime candidates for the most stable oxide dispersoids are considered by their large negative heats of the formation and the high melting points. There are many reports on the ODS Cu with Al 2 O 3 and Y 2 O 3 dispersoids, whereas a limited number of published papers are found on ODS Cu with Cr 2 O 3 [4,5].…”

Thermal expansion behavior of MgO/Cu composite with lower MgO volume fraction

“…This comes from the consideration of the Tresca yield criterion [12] which states that plastic deformation of the matrix will occur if the operative reduced shear stress exceeds the matrix yield stress, i.e. when: js r À s u j > 2k ¼ s y (8) For the MgO/Cu composite, only at temperature over certain values the stresses induced at interface are higher than the copper yield stress, i.e. 60 Mpa.…”

“…These characteristics make copper-matrix composites popular for a wide range of applications in electronic packaging or manufacturing of electrodes and contact terminals [1][2][3][4][5][6]. Copper can be dispersion strengthened by various dispersed particles such as oxides, carbides, and borides [7][8][9]. The wide selection of reinforcements permits the development of copper-matrix composite with low coefficient of thermal expansion (CTE) along with the increase in elastic modulus and thermal conductivity.…”

Preparation of Cu/Cr2O3 Composites by Mechanical Activation and In Situ Oxidation

“…Therefore, the residual Cr almost has no harm on the electrical conductivity of the composite [10]. Another important remembrancer is that the rate of reaction may be improved after mechanical activation [11].…”