The Influence of Al2O3 Powder Morphology on the Properties of Cu-Al2O3 Composites Designed for Functionally Graded Materials (FGM)

Abstract

In order to meet the requirements of an increased efficiency applying to modern devices and in more general terms science and technology, it is necessary to develop new materials. Combining various types of materials (such as metals and ceramics) and developing composite materials seem to be suitable solutions. One of the most interesting materials includes Cu-Al 2 O 3 composite and gradient materials (FGMs). Due to their potential properties, copper-alumina composites could be used in aerospace industry as rocket thrusters and components in aircraft engines. The main challenge posed by copper matrix composites reinforced by aluminum oxide particles is obtaining the uniform structure with no residual porosity (existing within the area of the ceramic phase). In the present paper, Cu-Al 2 O 3 composites (also in a gradient form) with 1, 3, and 5 vol.% of aluminum oxide were fabricated by the hot pressing and spark plasma sintering methods. Two forms of aluminum oxide (aAl 2 O 3 powder and electrocorundum) were used as a reinforcement. Microstructural investigations revealed that near fully dense materials with low porosity and a clear interface between the metal matrix and ceramics were obtained in the case of the SPS method. In this paper, the properties (mechanical, thermal, and tribological) of composite materials were also collected and compared. Technological tests were preceded by finite element method analyses of thermal stresses generated in the gradient structure, and additionally, the role of porosity in the formation process of composite properties was modeled. Based on the said modeling, technological conditions for obtaining FGMs were proposed.

Feasibility study: Resin-based functionally graded material incorporated with carbonized waste rice husk

“…This pattern is in accordance with Ref. [15], and further indicates the successful fabrication of FGM.…”

A Review on Functionally Graded Materials and Their Applications in the Field of Prosthetics

“…This method is generally consisting of four steps as following: mixing, stacking, pressing and sintering, as illustrated in Figure 3. PM technique gives rise to discontinuous gradient structure [28]. If continuous structure is desired, then centrifugal method is used.…”

Effect of La on microstructures and mechanical properties of Cu/Ti3SiC2/C nanocomposites sintered by vacuum hot-pressing and hot isostatic pressing

“…Cu/Ti 3 SiC 2 /C nanocomposites have good electrical conductivity, thermal conductivity and electrical conductivity, thus are widely used in the manufacture of automotive radiators, ship heat exchanger condensation plates, brake pads and corrosion resistant parts [1][2][3]. Ti 3 SiC 2 possesses high hardness, high melting point as well as excellent oxidation resistance and strength under the high temperature, which increases the bearing particles on the substrate and acts as a dispersion strengthening effect in the composite material to further improve the mechanical properties of composite materials [1]. Graphene nanoplatelets (CNP S ) and Carbon nanotubes (CNT S ) have similar atomic structures and are widely used in composite materials because of their high modulus of elasticity and high wear resistance.…”

“…Based on the ultra-high aspect ratio of CNT S , it can achieve fiber-like reinforcement in polymers. The bonding force between the Ti 3 SiC 2 layers is weak [1]. If an external force is applied to the structure, the layer will easily slide between the layers and will provide good lubrication during friction and wear.…”