Study of the Comparative Effect of Sintering Methods and Sintering Additives on the Microstructure and Performance of Si3N4 Ceramic

Yang, Liangliang; Ditta, Allah; Feng, Bo; Zhang, Yue; Xie, Zhihui

doi:10.3390/ma12132142

Cited by 16 publications

(9 citation statements)

References 26 publications

(25 reference statements)

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“…Thus, it was confirmed that SPS is more efficient than a conventional technique like GPS, producing higher bending strength, hardness, and thermal conductivity of Si 3 N 4 ceramics with both additive systems. 97 Yu et al studied the effect of sintering temperature and additives on the relative density of Si 3 N 4 ceramic fabricated by SPS. They observed that with an increase in sintering temperature, relative densities of the samples increased from 76% to 99% due to the formation of the liquid phase which assisted phase transformation and rearrangement.…”

Section: Microstructure and Densification Behavior Of Si 3 N 4 In Spsmentioning

confidence: 99%

“…All the prepared samples showed incomplete phase transformation and microstructure contained high aspect ratio b-Si 3 N 4 grains and intergranular glass. A maximum density of 3.16 g/cm 3 was obtained when SPS 97 was carried out at 1550 C. Figure 6 shows the displacement versus temperature plot during SPS for silicon nitride powders with fluoride and oxide additives. It can be seen from Figure 12, that MgF 2 shrinks at a lower temperature (1300 C) than MgO which shrinks at a higher temperature (1350 C).…”

Section: Microstructure and Densification Behavior Of Si 3 N 4 In Spsmentioning

confidence: 99%

“…Figure 10. SEM micrographs of the fractured surfaces of samples: (a) SYA, (b) SCA, (c) GYA, and (d) GCA 97. …”

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confidence: 99%

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A study on fabrication of silicon nitride-based advanced ceramic composite materials via spark plasma sintering

Mir

Ahmad

2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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The present study provides an overview of the fabrication of silicon nitride (Si3N4)-based advanced ceramic materials using spark plasma sintering. Being an excellent engineering ceramic material, silicon nitride is extensively being used in tribological components, aerospace, and automotive industries due to its unique blend of thermo-mechanical, tribological, and chemical properties. The selection of the sintering process, as well as sintering aids, strongly affects the properties of silicon nitride ceramics. Several conventional sintering techniques have been utilized in the past to optimize the structure and properties of silicon nitride ceramics such as hot pressing. However, spark plasma sintering, a relatively new, non-conventional, powder consolidating technique has recently gained significant attention to fabricate silicon nitride ceramic due to high heating rates, extremely short sintering time, and relatively low sintering temperatures which renders it an ideal technique for mass production. Both the composition and concentration of sintering additives during processing play a vital part in achieving the final desired properties of the bulk silicon nitride ceramic materials. In this review, the critical aspects like the effects of additive composition, additive concentration, and sintering parameters on microstructure and bulk properties of silicon nitride ceramics fabricated via spark plasma sintering are presented. The review may come in handy for scientists and engineers concerned with fabricating future silicon nitride composites with desired properties and performance for different engineering applications.

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Section: Microstructure and Densification Behavior Of Si 3 N 4 In Spsmentioning

confidence: 99%

Section: Microstructure and Densification Behavior Of Si 3 N 4 In Spsmentioning

confidence: 99%

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A study on fabrication of silicon nitride-based advanced ceramic composite materials via spark plasma sintering

Mir

Ahmad

2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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“…Today the most sought-after researchers are focused on creating new nanomaterials by advanced spark plasma sintering (SPS) [37,39,[82][83][84]. The development and creation of new progressive nanocomposite materials based on ceramic-ceramic and metal-ceramic compositions strengthened with metal nanoparticles and carbides, carbon nanotubes and nanofibers, graphene and graphene oxide are popular due to improved physical and mechanical properties and chemical inertness.…”

Section: Production Of Nanoceramics By Advanced Spsmentioning

confidence: 99%

On Electrical Discharge Machining of Non-Conductive Ceramics: A Review

et al. 2019

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The inability of ceramic and nanoceramic processing without expensive diamond tools and with a high-material-removal rate hampers the scope of its potential applications and does not allow humanity to make a full shift to the sixth technological paradigm associated with Kuhn scientific revolutions and Kondratieff's waves and restrains the growth of the economy. The authors completed a review on the research state of ceramic and nanoceramic processing by electrical discharge machining, which is possibly solved by two principal approaches associated with the usage of standard commercially available machine tools. The first approach is related to the introduction of expensive secondary phase; the second approach proposes initiate processing by adding auxiliary electrodes in the form of coating, suspension, aerosol, or 3D-printed layer based on the components of silver, copper, or graphite in combination with an improved dielectric oil environment by introducing graphite or carbon nanoparticles, which is hugely relevant today.Technologies 2019, 7, 55 2 of 16 of cutting tools limits the resulting geometry of the product. Other machining methods such as vibroacoustic machining, laser and electron beam scribing, selective laser sintering with a binder, find their specific place in the processing of ceramics. However, they do not allow the receiving of all geometrically possible shapes of the product without losses on the operational parameters of ceramics [16][17][18].One of the most popular methods for the production of parts, regardless of their hardness, is electrical discharge machining (EDM). However, it requires the material to be conductive [19][20][21]. The process of electrical erosion of the material consists of initiating electric pulses in the interelectrode gap, in the breakdown of the dielectric medium in the gap, in establishing a discharge channel, where the temperature reaches more than 10,000 • C (low-temperature plasma). Due to such temperatures, the material is ablated, the drops of cooled material as eroded debris are washed away by the flow of the dielectric medium, and the electrodes again approach to resume the cycle. Thus, a unique crater-like topology on the surface of the workpiece is created [22][23][24][25].The inability of ceramics and nanoceramics to conduct current hampers the scope of its potential applications and restrains the growth of the progress and the switch to the next technological paradigm that most of the scientists associate with the term "nano" [26][27][28][29][30][31][32].Thus, it can be concluded that the study and development of a method for electrical discharge machining of non-conductive ceramics and nanoceramics are incredibly relevant today.The authors propose to apply the dialectical approach of cognition as a scientific approach to solve the formulated scientific problem. The dialectical approach includes the systematization and updating of existing knowledge and new data about the object of research.

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“…The artificially made metal and metalloid nitrides have been for sound reasons a focus of intensive research in recent years [ 1 ]. This is supported by the successful examples of such paramount applications of Group III nitrides as in efficient UV to blue range operating optoelectronic devices and white LEDs [ 2 ], by unmatched various ceramics/electronic applications for aluminium nitride AlN [ 3 , 4 ], boron nitride BN [ 5 ], silicon nitride Si 3 N 4 [ 6 , 7 ], and titanium nitride TiN [ 8 ] or by the extensively studied applications of broad bandgap semiconductor gallium nitride GaN [ 1 , 2 , 9 , 10 ]. In this regard, composites made of the nitrides offer various attractive capabilities by utilizing the synergy of coexisting electronic and mechanical/thermal properties.…”

Section: Introductionmentioning

confidence: 99%

Novel Composite Nitride Nanoceramics from Reaction-Mixed Nanocrystalline Powders in the System Aluminum Nitride AlN/Gallium Nitride GaN/Titanium Nitride TiN (Al:Ga:Ti = 1:1:1)

et al. 2022

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A study is presented on the synthesis of reaction-mixed nitride nanopowders in the reference system of aluminium nitride AlN, gallium nitride GaN, and titanium nitride TiN (Al:Ga:Ti = 1:1:1) followed by their high-pressure and high-temperature sintering towards novel multi-nitride composite nanoceramics. The synthesis starts with a 4 h reflux in hexane of the mixture of the respective metal dimethylamides, which is followed by hexane evacuation, and reactions of the residue in liquid ammonia at −33 °C to afford a mixed metal amide/imide precursor. Plausible equilibration towards a bimetallic Al/Ga-dimethylamide compound upon mixing of the solutions of the individual metal-dimethylamide precursors containing dimeric {Al[N(CH3)2]3}2 and dimeric {Ga[N(CH3)2]3}2 is confirmed by 1H- and 13C{H}-NMR spectroscopy in C6D6 solution. The precursor is pyrolyzed under ammonia at 800 and 950 °C yielding, respectively, two different reaction-mixed composite nitride nanopowders. The latter are subjected to no-additive high-pressure and high-temperature sintering under conditions either conservative for the initial powder nanocrystallinity (650 °C, 7.7 GPa) or promoting crystal growth/recrystallization and, possibly, solid solution formation via reactions of AlN and GaN towards Al0.5Ga0.5N (1000 and 1100 °C, 7.7 GPa). The sintered composite pellets show moderately high mechanical hardness as determined by the Vicker’s method. The starting nanopowders and resulting nanoceramics are characterized by powder XRD, Raman spectroscopy, and SEM/EDX. It is demonstrated that, in addition to the multi-nitride composite nanoceramics of hexagonal AlN/hexagonal GaN/cubic TiN, under specific conditions the novel composite nanoceramics made of hexagonal Al0.5Ga0.5N and cubic TiN can be prepared.

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Study of the Comparative Effect of Sintering Methods and Sintering Additives on the Microstructure and Performance of Si3N4 Ceramic

Cited by 16 publications

References 26 publications

A study on fabrication of silicon nitride-based advanced ceramic composite materials via spark plasma sintering

A study on fabrication of silicon nitride-based advanced ceramic composite materials via spark plasma sintering

On Electrical Discharge Machining of Non-Conductive Ceramics: A Review

Novel Composite Nitride Nanoceramics from Reaction-Mixed Nanocrystalline Powders in the System Aluminum Nitride AlN/Gallium Nitride GaN/Titanium Nitride TiN (Al:Ga:Ti = 1:1:1)

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