Microstructure and mechanical properties of α/β-Si3N4 composite ceramics with novel ternary additives prepared via spark plasma sintering

Huang, Junwei; Lv, Xiaoan; Dong, Xiaofeng; Hussain, Majid; Chen, Ge

doi:10.1016/j.ceramint.2022.06.311

Cited by 14 publications

(3 citation statements)

References 36 publications

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“…The columnar crystals of β-Si 3 N 4 are the main reason for the high mechanical properties of Si 3 N 4 materials, so the diameter of crystals, aspect ratio, and the integrity of crystal growth, are important factors determining whether Si 3 N 4 materials can have high mechanical properties 56 . Among them, the aspect ratio and directionality of the crystal are more critical 57 . From the experimental results of this study, it can be seen that compared to GPS Si 3 N 4 and HPS Si 3 N 4 , MS Si 3 N 4 yields a suitable diameter size of the columnar crystal achieves high mechanical properties due to its high aspect ratio, intact crystal morphology, and directionality.…”

Section: Discussionmentioning

confidence: 99%

Preparation of 3D printed silicon nitride bioceramics by microwave sintering

Zeng,

Sipaut,

Ismail

et al. 2024

Sci Rep

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Silicon nitride (Si3N4) is a bioceramic material with potential applications. Customization and high reliability are the foundation for the widespread application of Si3N4 bioceramics. This study constructed a new microwave heating structure and successfully prepared 3D printed dense Si3N4 materials, overcoming the adverse effects of a large amount of 3D printed organic forming agents on degreasing and sintering processes, further improving the comprehensive performance of Si3N4 materials. Compared with control materials, the 3D printed Si3N4 materials by microwave sintering have the best mechanical performance: bending strength is 928 MPa, fracture toughness is 9.61 MPa·m1/2. Meanwhile, it has the best biocompatibility and antibacterial properties, and cells exhibit the best activity on the material surface. Research has shown that the excellent mechanical performance and biological activity of materials are mainly related to the high-quality degreasing, high cleanliness sintering environment, and high-quality liquid-phase sintering of materials in microwave environments.

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Section: Discussionmentioning

confidence: 99%

Preparation of 3D printed silicon nitride bioceramics by microwave sintering

Zeng,

Sipaut,

Ismail

et al. 2024

Sci Rep

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“…As listed in Table 1 , the content of Y 2 O 3 as sintering aids is fixed at 5 wt% according to the research on Y 2 O 3 additive concentration [ 7 ]. Based on a previous study [ 31 ], 5 wt% AlN-5 wt% ZrN-5 wt% Al 2 O 3 as a sintering additive was introduced into sample S-2 for further improving its sinterability. The formulas of the samples named S-1, S-2 and S-3 refer to the addition of 5 wt% β-Si 3 N 4 whiskers, 20 wt% TiC, and 5 wt% β-Si 3 N 4 seeds-5 wt% TiC-10 wt% β-Si 3 N 4 whiskers, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…Additionally, much research [ 31 , 32 , 33 ] has indicated that the bimodal distribution [ 34 ] of Si 3 N 4 ceramics with more columnar β-Si 3 N 4 grains is advantageous to improve the strength and toughness by introducing low-cost β-Si 3 N 4 [ 35 ] whiskers [ 27 ] and/or seeds [ 36 ]. In addition, generally, various reinforced particles such as TiC [ 37 ], TiN [ 5 , 27 ], Ti(C, N) [ 11 ], WC [ 38 ], SiC [ 4 ] and graphene [ 39 ] are also mixed into Si 3 N 4 -based ceramics [ 35 ] to enhance their properties.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Reinforcement of Si3N4 Based Ceramics Fabricated via Multiphase Strengthening under Low Temperature and Short Holding Time

Huang,

Lv,

Dong

et al. 2023

Materials

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Si3N4 ceramic as a tool material shows promising application prospects in high-speed machining fields; however, the required high mechanical properties and low-cost preparation of Si3N4 ceramic tool materials restrict its application. Herein, synergistic reinforced Si3N4 ceramic tool materials were fabricated by adding β-Si3N4 seeds, inexpensive Si3N4 whiskers and TiC particles into coarse commercial Si3N4 powder (D50 = 1.5 μm), then sintering by hot-pressing with low temperature and short holding time (1600 °C—30 min—40 MPa). The phase assemblage, microstructure evolution and toughening mechanisms were investigated. The results reveal that the sintered Si3N4 ceramics with synergistic reinforcement, compared to those with individual reinforcement, present an enhancement in relative density (from 94.92% to 97.15%), flexural strength (from 467.56 ± 36.48 to 809.10 ± 45.59 MPa), and fracture toughness (from 8.38 ± 0.19 to 10.67 ± 0.16 MPa·m1/2), as well as a fine Vickers hardness of 16.86 ± 0.19 GPa. Additionally, the various reinforcement modes of Si3N4 ceramics including intergranular fracture, crack deflection, crack bridging and whiskers extraction were observed in crack propagation, arising from the contributions of the added β-Si3N4 seeds, Si3N4 whiskers and TiC particles. This work is expected to serve as a reference for the production of ceramic cutting tools.

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