Preparation and properties of Al2O3 nanoparticle reinforced copper matrix composites by in situ processing

Dellafossite CuAlO2 film growth and conversion to Cu–Al2O3 metal ceramic composite via control of annealing atmospheres

“…During this set of experiments, very little copper aluminates were detected, implying the amount formed was very limited (at least at the detection limit of the present measurement). During the initial heating period and during the first 8 minutes when CuO 10 was major component of the film, no CuAl 2 O 4 was detected, nor was any CuAlO 2 detected during the second 8 minutes when Cu 2 O was the dominant species present. In addition, the final product formed was metallic copper.…”

“…20 This suggests that an optimum annealing procedure would consist of 5 two stages with the initial heating being conducted at low oxygen partial pressure so as to encourage the rapid decomposition of CuO, followed by a prolonged anneal at atmospheric oxygen partial pressures so as to enable the reaction between Cu 2 O and Al 2 O 3 . Furthermore, the dependence on annealing atmosphere 10 also suggests that it may be possible to convert previously formed CuAlO 2 films to a MCC via a thermal decomposition route. The distinct advantage of this route lies in the fact that the Cu and Al are already intimately mixed at the atomic level, and are of equal stoichiometry, which should yield highly conductive MCCs.…”

Copper Matrix Composites Reinforced With Titanium Nitride Particles Synthesized by Mechanical Alloying and Spark Plasma Sintering

“…The most-widely-applied methods for producting copper matrix composites are based on the following: powder metallurgy methods, internal oxidation method, self-propagating high temperature synthesis process (SHS), accumulative roll bonding, mechanochemical route, and friction stir welding [4][5][6][7][8][9][10][11][12][13][14][15][16].…”

“…The carbides (e.g., SiC, TiC, NbC, WC, TaC, B 4 C), oxides (e.g., Al 2 O 3 , Y 2 O 3 , SiO 2 , Cr 2 O 3 , TiO 2 ), and borides (e.g., TiB 2 , ZrB 2 ) are widely used as reinforcement additives; volcanic tuff, diamond particles, intermetallic phases, shavings of steel processing, and carbon tubes or fibers [4][5][6][7][8][9][10][11][12][13][14][15][16] are also starting to play a significant role in this domain. Among those modern reinforcing materials, TiN-based nitrides play a pronounced role, since they are characterized by high hardness, excellent electrical conductivity, good thermal and chemical stability, excellent stability at high temperatures, and good corrosion resistance [17,18].…”

Obtaining of nanostructured powders for production of new dispersion strengthened sintered material in the system Cu-Al2O3

“…Do pojave treće faze u ovom sistemu dolazi zbog povećanja površinske energije sistema usled prisustva nanometarskih čestica Al 2 O 3 , što može biti pokretačka sila za ovu reakciju na temperaturi redukcije od 975°C, što je niža temperatura od navedenih rezultata ispitivanja mogućnosti eutektičkog vezivanja bakra i oksida, gde je pokazano da se ova reakcije odigrava na eutektičkoj temperaturi od 1065°C. Pojava treće faze je uočena i prilikom mehano-hemijske sinteze pod određenim termodinamičkim uslovima [75,76], utiče na dislokacionu strukturu i doprinosi poboljšanju mehaničkih osobina uz zadržavanje zadovoljavajuće električne provodljivosti.…”