Formation of Lanxide^TM ceramic composite materials

Abstract

An overview is given of a new process that has been used successfully to make numerous ceramic/metal composite materials by directed oxidation of molten metallic precursors. As an example, the formation of A12O3/A1 composites from Al is discussed in detail.

The influence of loading rate on crack bridging processes in Al2O3

“…Crack bridging by unfractured ligaments in polycrystalline monophase ceramics [1], brittle whiskers [2] or ®bers [3] in ceramic composites or by ductile metal particles in cermets [4] is known to provide signi®cant enhancement of the toughness of brittle ceramic materials. Bridging ceramics show resistance (R-) curve behavior [5], a schematic of which is shown in Fig.…”

Synthesis of Aluminide-Alumina Composites by Reactive Squeeze Casting

“…Composites structured as interpenetrating networks of Al 2 O 3 and metals, that have demonstrated promising properties that have been fabricated by various techniques, such as directed metal oxidation (DIMOX), [1,2] reactive metal penetration (RMP), [3,4] and liquid metal infiltration into porous preforms. [5,6] The application temperature of these composites is limited by the low melting temperature of aluminum.…”

In situ synthesis of cold-rollable aluminum–aluminum nitride composites via arc plasma-induced accelerated volume nitridation

“…1 However, AMCs manufactured by conventional ex situ processes are economically unfavorable due to expensive reinforcing materials and thermodynamic instability resulting from interfacial reaction between matrix and reinforcements. 2 Thus, in situ fabrication of AMCs with a ceramic second phase such as TiC, Al 2 O 3 , and SiC has been investigated for several decades and various processes like self-propagating high temperature synthesis, 3 directed melt oxidation, 4,5 or gas bubbling method 2,[6][7][8][9][10] have been developed as a feasible process depending on the formation of ceramic second phase. Recently, aluminum nitride (AlN) has been considered as an attractive second phase in AMCs due to excellent TC and low CTE.…”