Abstract
The influence of the various content of the multilayered graphene (MLG) on the structural and mechanical properties of the final bulk porous silicon nitride-zirconia (Si 3 N 4 -ZrO 2 ) based ceramics was investigated. The ceramic composites were prepared in the form of the laminated structure with different (5-30-5 wt% and 30-5-30 wt%) MLG content by hot isostatic pressing. Homogeneous distribution of the MLGs, a completed phase transition from α to β-Si 3 N 4 in case of 5 wt% MLG have been observed. The structural examinations revealed that the multilayered graphene and zirconia particles owing to their different sizes and shapes influenced the porous microstructure evolution and the related mechanical properties of the composites. The sandwich structures enhanced the mechanical properties compared to reference ceramic with 30 wt% MLG. The position of the layer with higher graphene content, high ratio of α/β phase of Si 3 N 4 and higher porosity had crucial effect on the final mechanical properties. • 5 or 30 wt% MLG added porous Si 3 N 4 -ZrO 2 composites were sintered by stacking alternative layers. • The mechanical test of 5-30-5 wt% MLG layers showed 2 or 3 times better properties than structure with 30-5-30 wt% MLG. • The main effect on mechanical properties had the layer with 30 wt% MLG having ∼ 66% porosity and high α /β-Si 3 N 4 ratio. • The layer with 5 wt% MLG resulted friction coefficient ∼ 0.5 and with 30 wt% MLG ∼ 0.7 at scratch test at dry condition.
Highlights
The silicon nitride (Si3N4) is the widely used high-temperature ceramic material [1]
The reference and sandwich ceramics with various multilayered graphene (MLG) content were realized by hot isostatic pressing (HIP) sintering
The main effect on mechanical properties had the layer with 30 wt% MLG and it regulated the mechanical behaviour of final sandwich ceramic
Summary
The silicon nitride (Si3N4) is the widely used high-temperature ceramic material (up to 1500 C) [1]. Miranzo et al published an extensive review on several ceramics containing graphene fillers [20] They compared a wide number of bulk composites, making special highlight on their mechanical (fracture toughness, strength) and elastic properties, along with wear and friction characteristics. The improvement of thermal conductivity caused by the graphene fillers was proven, which might be advantageous in some applications like for thermal management and thermal protection In another aspect, the use of tetragonal zirconia as a reinforcement component can effectively result in the improvement of the fracture toughness of Si3N4 ceramics [21]. There is no detailed study known on the effect of the laminated structures of ceramics and of the MLG content on morphology, hardness and mechanical characteristics of Si3N4-ZrO2 composite materials. The density of all sintered composites was measured applying the Archimedes method
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