Silicon nitride based nanocomposites produced by two different sintering methods

Recent Advances on Carbon Nanotubes and Graphene Reinforced Ceramics Nanocomposites

“…The low temperature requirement and fast sintering rate advantages of SPS made it widely used for ceramic nanocomposites filled with carbon nano-fillers [ 20 , 24 , 43 , 95 , 96 , 97 , 98 ]. However, there are a few groups reported very good GNPs-reinforced ceramic nanocomposites based on HP densification [ 97 , 98 , 99 , 100 ]. For example, the GNPs-Si 3 N 4 nanocomposites reported by Rutkowski et al [ 99 ] showed improved thermal properties.…”

“…The authors believed that due to similar mechanical properties to CNTs, and better dispersability GNPs are an effective alternative for CNTs in ceramic composites. In Si 3 N 4 matrix, Tapaszto et al [ 100 ] showed that GNPs indeed outperformed CNTs. However, it should be noted that, due to the larger contact area between GNPs and the matrix grains, the interface quality plays a more important role in toughening the ceramics than CNTs and other reinforcement phases.…”

Spark plasma sintering of Si3N4/multilayer graphene composites

“…They both reported considerable improvement on the mechanical properties regardless of the type of the used MLG. Tapasztó et al [16] compared the performance of the various carbon nanostructures in Si 3 N 4 matrix using 3 wt% additives, however, they did not find any improvement for the graphene incorporated silicon nitride composites. Ramirez et al [17] also studied the fracture toughness for Si 3 N 4 composites containing commercial graphene, and they reported a 40% improvement in the fracture toughness at 4.3 vol.% GNP addition.…”

Wear Maps and Models in Tribological Damage Analysis of Si3N4 Ceramics with Special Attention to Tribochemical Wear

“…The initial powder mixtures were milled by high energy attrition mill, with zirconia agitator delta discs and zirconia grinding media, resulting ZrO2 contamination of the initial powder mixture. The technological details for the HIP processing are fully presented in former works [54,53] with the following differences and complementation: HIP was performed at 1700 °C, applying 20 MPa pressure for 3 hours, while the maximum heating temperature during SPS was 1500 °C for 5 min dwell time applying a 50 MPa uniaxial pressure. The average diameter and thickness of the disc-shaped as-sintered HIP specimens were of 27 mm and 3.5 mm respectively.…”