Cu-TiB metal matrix composites prepared by powder metallurgy route

Abstract

Titanium boride (TiB) is characterized by good conductivity, high strength and high melting point. In this work, TiB was used to make Cu-TiB metal matrix composites (MMCs). Amounts of TiB added into Cu matrix were 2wt.%, 5wt.%, 10 wt.% and 15 wt.%. The samples were pressed at pressures of 500MPa, 600MPa, 700MPa and 800MPa and sintered at 820o and 920o, respectively. The properties of the sintered composites such as hardness and impact toughness were studied. Hardness and impact toughness of samples increased with increasing pressures and decreased with increasing contents of TiB. Composite with good mechanical properties and high conductivity was obtained from the sample containing 2wt.%TiB compacted at 800MPa and sintered at 920o. It was shown that 2wt.% TiB is a suitable content to make Cu-TiB MMCs with good mechanical properties and excellent conductivity.

Effect of sintering temperatures on the properties of in-situ copper-niobium-titanium di-boride composites

“…However, the presence of niobium oxides (NbO x ), copper oxides (CuO x ), and titanium oxides (TiO x ) contributed, immensely, to the NTE of the CuNbTiB 2 composite (Figs. 5,6,7,8,9,10) in this study.…”

“…However, the extinction of the peaks in this study, which are responsible for the proper densifications, according to the work of Diouf and Molinari [25], could be attributed to the presence of dissolved oxygen in the samples, as can be seen in the SEM and EDS images (Figs. 5,6,7,8,9,10). The presence of oxygen in the sintering samples, during the spark plasma sintering process, hinders the densification mechanism [26].…”

“…Titanium-diboride is a ceramic material and its excellent mechanical and good conductive properties, predetermine its potential use in various high-temperature applications, especially those including highly corrosive molten salts [9]. To enhance the strength of copper metal matrix composites, some hard additives, e.g., titanium-diboride had been employed [10][11][12][13][14][15].…”

“…There is no literature information on copper-niobium-titanium-diboride (CuNbTiB 2 ) fabricated at two different sintering temperatures, via the spark plasma sintering technique, as well as the effects of varying sintering temperatures on their microstructure, mechanical properties, coefficient of thermal expansion, and corrosion resistance, in an acid solution environment. However, the selection criteria of the composition determined in this study were based on the results obtained on good properties of copper-niobium and copper-titanium diboride of the previous works [3,4,6,[10][11][12][13][14].…”

Preparation, microstructure and property of zinc-substituted hydroxyapatite/magnesium biocomposite

“…Magnesium matrix composites are usually prepared by spray forming [14], stir casting [15] and powder metallurgy [16,17]. Among these methods, the powder metallurgy is simple, which can make the reinforced particles distribute homogeneously in the matrix and improve the plastic processing performance of the composites.…”