Synthesis, Densification and Properties of SiAlON Bodies and Composites

Abstract

The sialon research programme at Industrial Research Ltd., New Zealand, comprises fundamental and strategic studies funded by central government that underpin an applied science and technology transfer programme designed in association with industry partners and supported through joint government-industry funding initiatives. The paper surveys current and recent research into a range of sialon fabrication processes, bodies and composites with particular emphasis on O-sialon.

Dense β-SiAlONs consolidated by a modified hydrolysis-assisted solidification route

“…[1][2][3][4][5] These ceramics are normally made by a conventional dry-powder pressing technique followed by reaction sintering of precursor mixtures at elevated temperatures to achieve full density, followed by extensive and expensive machining to obtain the desired shape. 6,7 However, this technique has been found to be difficult and quite expensive particularly for making large size and complex shaped components.…”

Near‐Net Shape β‐Si4Al2O2N6 Parts by Hydrolysis Induced Aqueous Gelcasting Process

“…b-SiAlON ceramics have been found to be important materials for a variety of applications on account of their attractive properties such as high strength, good oxidation, and creep resistance at ambient and elevated temperatures, high elastic modulus, good thermal shock resistance and outstanding rain erosion, and particle impact resistance. [1][2][3][4][5] These ceramics are used as engine components, parts for welding, extrusion and molten metal handling, and seals, bearings, wear resistant components, and so on. Recently, these ceramics have also been identified as potential candidate materials for radome applications.…”

“…[6][7][8][9] These ceramics are normally made by a conventional dry-powder pressing (CDPP) technique followed by reaction sintering of precursor mixtures at elevated temperatures to achieve full density, followed by extensive and expensive machining to obtain the desired shape. [4][5][6] However, this technique has been found to be difficult and quite expensive particularly for making large size and complex-shaped components such as radomes. In order to develop alternative simpler processing routes, recently, slip casting, 10 injection molding, 11 temperature induced forming, 12 etc., have been devised for these ceramics.…”

“…[1][2][3][4][5] These ceramics are used as engine components, parts for welding, extrusion and molten metal handling, and seals, bearings, wear resistant components, and so on. [1][2][3][4][5] These ceramics are used as engine components, parts for welding, extrusion and molten metal handling, and seals, bearings, wear resistant components, and so on.…”

“…[1][2][3][4][5] These ceramics are used as engine components, parts for welding, extrusion and molten metal handling, and seals, bearings, wear resistant components, and so on. [4][5][6] However, this technique has been found to be difficult and quite expensive particularly for making large size and complex-shaped components such as radomes. [6][7][8][9] These ceramics are normally made by a conventional dry-powder pressing (CDPP) technique followed by reaction sintering of precursor mixtures at elevated temperatures to achieve full density, followed by extensive and expensive machining to obtain the desired shape.…”