Microstructure and thermal characteristics of SiC–Al2O3–Ni composite for high-temperature application

Abstract

The development of the aviation industry is related to the production of new materials that can operate at high temperatures and corrosive atmospheres. The paper presents new material for application in high temperature obtained by pressing and sintering a composite made from SiC-Al 2 O 3 -Ni. Analysis of the microstructure showed high porosity, which is caused by used manufacturing technique. Studies of thermal expansion do not show any phase transition and keeps linearity in thermal expansion in wide range (from 550 to 1450 K). X-ray diffraction showed the presence of all components of phase with those used, the phase associated with the components and silicon oxide, which was formed during the sintering of the samples.

Radiation and electrostatic resistance for ultra-stable polymer composites reinforced with carbon fibers

“…The measurements were taken across the manufactured plates from which the samples were cut and provided with strictly controlled properties. During the environmental testing, the composites with quasi-isotropic (±45°/90°/0°) s and UD (90°) 16 and UD (0°) 16 layups were tested. Both exhibited the same behavior.…”

“…1 shows a qualitative comparison of materials commonly considered for structural components, including recent innovations. Most advanced inorganic space materials such as silicon carbide (SiC), silicon nitride (Si 3 N 4 ) or Zerodur have high robustness and low coefficient of thermal expansion (CTE) [around 2.2 to 5 parts per million (15)(16)(17)], thus offering some degree of dimensional stability. However, this strength introduces fragility and incurs high weight and cost, while restricting modification after fabrication.…”

“…The NIRSpec (near-infrared spectrograph) instrument onboard the James Webb Space Telescope experienced these issues with its SiC optical bench exceeding the costs and manufacturing schedule (18,19), while Zerodur showed radiation-induced compaction on the Semi-Conductor Inter Satellite Link Experiment mirror (the first European optical communication terminal in orbit), thereby leading to deformation (20). These materials are also good electrical insulators with an electrical resistivity around 10 8 ohm⋅m or higher (15)(16)(17). Attempts to enhance these properties, for example, by doping or changing particle concentration and processing steps, have shown to ultimately reduce the mechanical performance in single-crystal materials (15)(16)(17)20).…”

“…These materials are also good electrical insulators with an electrical resistivity around 10 8 ohm⋅m or higher (15)(16)(17). Attempts to enhance these properties, for example, by doping or changing particle concentration and processing steps, have shown to ultimately reduce the mechanical performance in single-crystal materials (15)(16)(17)20).…”

Thermo-derivative analysis of Al–Si–Cu alloy used for surface treatment

“…Special attention was payed to studying of the surface layer morphology of the investigated material especially the surface layer microstructure [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] if the used ceramic particle powder was properly introduced into the matrix, how the phases were changed in terms of distribution and size as well as if a zone-like structure was obtained after appliance of the laser surface treatment.…”