Response Surface Modeling and Optimization of Gelcast Fused Silica Micro Hybrid Ceramic Composites

Silicon - In the current work, Response Surface Methodology (RSM) was effectively implemented to the technique of fabrication of fused silica (SiO2) advanced hybrid ceramic composites using...     

Influence of Silicon Nitride (Si3N4) on Mechanical and Dielectric Properties of a Novel Fused Silica Ceramic Composites

Silicon - Porous fused silica (SiO2) ceramic composites were fabricated using a novel gel-casting process and the experiments were conducted using Response Surface Methodology (RSM) central...     

Influence of Solid Loading and Ratio of Monomers on Mechanical and Dielectric Properties of Hybrid Ceramic Composites

Silicon - Hybrid ceramic (SiO2-Si3N4-Al2O3) composites were prepared by gel casting process, a near net shape technique. The effects of solid loading and monomers ratio on flexural strength,...     

Erosion Behavior of Gelcast Fused Silica Ceramic Composites

In this paper, the characteristics of solid particle erosion on fused silica ceramics are investigated. Gelcasting, a near net shape forming process, is adopted for the fabrication of ceramics. Three types of ceramics with a combination of pure fused silica, fused silica+5 wt% silicon nitride (Si₃N₄)?+?1 wt% boron nitride (BN) and fused silica+5 wt% silicon nitride (Si₃N₄) +1 wt% alumina (Al₂O₃) are prepared at a constant 52 vol% solid loading, 10 wt% monomer content and 10:1 monomer ratio. Different impingement angles (30^o, 45^o, 60^o and 90^o) and three impact velocities (86 m/s, 101 m/s and 148 m/s) were chosen to examine the behavior of erosion on gelcasted ceramics using SiO₂ particles as erodent. The maximum rate of erosion is obtained at normal impingement angle (90^o), which shows the brittle nature of ceramics. The impact velocity and angle of impingement have an appreciable effect on erosion rate. Resistance to erosive wear is found to have improved with the inclusion of reinforcements in the fused silica ceramics. The erosion rates of different ceramics are compared. Ceramic composite with a combination fused silica+5 wt% Si₃N₄+ 1 wt% BN shows the highest resistance to wear. The surface roughness and morphology of the eroded surfaces have also been studied.