In-situ processing of TiB2 nanoparticle-reinforced copper matrix composites

Abstract

In order to produce the composite powder analyzed in this paper, two prealloys were melted and afterwards gas atomized. The obtained TiB2-reinforced copper powder was consolidated by hot isostatic pressing (HIP). Since it is known that a decrease in the size of the reinforcing phase can cause an increase in hardness of composites, the main aim of the experimental work was to obtain as small particles of the dispersed phase as possible by using standard powder metallurgy techniques. Microstructure and microhardness of the ascast prealloys, as-atomized powder and HIP-ed compacts were examined. The results of these examinations revealed that TiB2 particles about 10 nm in size were in-situ formed and homogenously dispersed in the copper matrix. As a consequence of the TiB2 formation, the microhardness of Cu-TiB2 composite was significantly improved

The Cu matrix cermets remarkably strengthened by TiB2 “in situ” synthesized via self-propagating high temperature synthesis

“…Indeed, considerable effort is being devoted to the development of materials with significant copper content [1][2][3][4][5][6][7] for applications in petrochemical and electronic industry [4,6,8] as well as in aerospace, where the ability to remove heat and retain sufficient strength is of critical importance [9,10]. Development of such composites with high conductivity and also high strength can be achieved by uniformly distributed ceramic materials such as oxides, borides, carbides and nitrides [2,4,5,[11][12][13] or silicides [14].…”

“…Indeed, considerable effort is being devoted to the development of materials with significant copper content [1][2][3][4][5][6][7] for applications in petrochemical and electronic industry [4,6,8] as well as in aerospace, where the ability to remove heat and retain sufficient strength is of critical importance [9,10]. Development of such composites with high conductivity and also high strength can be achieved by uniformly distributed ceramic materials such as oxides, borides, carbides and nitrides [2,4,5,[11][12][13] or silicides [14]. Especially TiB 2 , due to extremely high stiffness and hardness (3400HV) [3,10,15,16], ultra-high melting point (3225 o C) [3,17] and the best among borides and carbides both thermal and electrical conductivity (66W/mK) [3,18] is suitable candidate for Cu-matrix composite [7,11,12,[19][20][21].…”

“…The Cu-based bulk composites with TiB 2 formed by precipitation or dispersion strengthening were studied several times, using different technologies, sometimes in complex processes, such as ball milling and subsequent annealing [9,22,25], hot pressing [18,23] or hot pressing preceded by mechanical alloying [1,10], melting and "in situ" synthesis [15], casting process combined with electromagnetic stirring [12], spray forming process combined with melting and hot extrusion [3,11], pressureless infiltration [23] or melting and gas atomizing [14], sometimes also combined with hot pressing [5]. The combustion synthesis was also applied to fabricate TiB 2 -Cu composites containing 40 wt.% of Cu as described by Xu et al [4].…”

Investigation of Mechanical Properties of Sisal Fiber Reinforced Polymer Composites

“…High mechanical strength and excellent electrical conductivity of copper matrix composites, along with other properties, ensure a wide application range for these materials [2], [3]. Alumina silicate refractories are used in metallurgical, ceramic and glass industries [4].…”

Determination of Warm Working Temperature Range for In Situ Alm–TiB2p Composite

“…The difference in thermal expansion coefficient between particle and matrix will induce thermal stresses posing some difficulties [9,10] such as dimensional instability of composites in applications. TiB 2 particulate composites with intermetallic matrices [11][12][13][14][15], copper matrix, [16] aluminium and aluminium alloy matrices [17][18][19] aluminium foams [20] have been investigated widely. In the present work warm working of Al m -TiB 2p composite is investigated.The relevant properties of Al and TiB 2 are listed in Table 1 [21].…”