Direct coagulation casting of silicon nitride suspension via a dispersant reaction method

Gan, Ke; Xu, Jie; Zhang, Xiaoyan; Yang, Minghao; Qu, Yanan

doi:10.1016/j.ceramint.2015.11.113

Cited by 20 publications

(4 citation statements)

References 21 publications

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“…This structure could enhance the strength of green body which was higher than that prepared in our previous works. 19,20 Figure 13A shows the microstructures of silicon carbide green bodies. The green bodies were prepared with homogeneous microstructure and had no pores in this research.…”

Section: Resultsmentioning

confidence: 99%

“…Silicon nitride and silicon carbide ceramics were prepared using chemical treated powder by DCC via dispersant reaction and liquid phase sintering. 19,20 Tetramethyl ammonium hydroxide (TMAOH) and glyceryl diacetate were used as dispersant and coagulant which can react at elevated temperature to cause the destabilization of the suspension due to the reduction of dispersion. Oxide ceramics such as yttria-stabilized zirconia and alumina via dispersant hydrolysis and removal using sodium tripolyphosphate (STPP) and oleic acid (OA) as dispersant had been prepared.…”

Section: Introductionmentioning

confidence: 99%

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Direct coagulation casting of silicon carbide suspension via polyelectrolyte dispersant crosslink reaction

Gan

Gai

Wang

et al. 2019

Int J Applied Ceramic Tech

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A direct coagulation casting method for silicon carbide ceramic suspension using dispersant crosslink reaction is reported. Polymer electrolyte (polyethyleneimine, PEI) was used as dispersant to prepare silicon carbide suspension. Common food additives (carboxymethyl cellulose, CMC) were used to coagulate the electrosteric stabilized silicon carbide suspension. There was a well disperse silicon carbide suspension with 0.2 wt% PEI at pH = 5-6. Influence of coagulant on viscosity and zeta potential of the silicon carbide suspension was investigated. It indicates that the high solid loading silicon carbide suspension can be destabilized and coagulated at elevated temperature. It can be attribute to the gradual decrease of electrosteric force due to the crosslink reaction between PEI and CMC. Silicon carbide wet green body with compressive strength of 1.99 MPa could be demolded at 70°C which is higher than that prepared by traditional DCC and dispersant reaction method for nonoxide ceramics. Dense silicon carbide ceramics with relative density above 98.8% and 99.3% had been prepared by liquid phase pressureless and hot pressed sintering, respectively.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Direct coagulation casting of silicon carbide suspension via polyelectrolyte dispersant crosslink reaction

Gan

Gai

Wang

et al. 2019

Int J Applied Ceramic Tech

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“…At present, Si 3 N 4 -based parts can be obtained by various methods, such as direct coagulation casting [21,22], reaction sintering [22], spark plasma sintering [23][24][25], tape casting [26], hot-press sintering [27], gel casting [28,29], and others.…”

Section: Introductionmentioning

confidence: 99%

Granulation of Silicon Nitride Powders by Spray Drying: A Review

et al. 2022

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Spray drying is a widely used method of converting liquid material (aqueous or organic solutions, emulsions and suspensions) into a dry powder. Good flowability, narrow size distribution, and controllable morphology are inherent in powders produced by spray drying. This review considers the granulation factors that influence the final properties of the silicon nitride dried powders. The first group includes the types of atomizers, manifolds, and drying chamber configurations. The process parameters fall into the second group and include the following: inlet temperature, atomizing air flow, feed flow rate, drying gas flow rate, outlet temperature, and drying time. Finally, the last group, feedstock parameters, includes many factors such as feed surface tension, feed viscosity, solvent type, solid particle concentration, and additives. Given the large number of factors affecting morphology, particle size and moisture, optimizing the spray drying process is usually achieved by the “trial and error” approach. Nevertheless, some factors such as the effect of a solvent, dispersant, binder, and sintering additives considered in the literature that affect the Si3N4 granulation process were reviewed in the work. By summarizing the data available on silicon nitride powder production, the authors attempt to tackle the problem of its emerging demand in science and industry.

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“…In comparison with gelcasting technique, this forming process is facile, eco‐friendly, and highly effective, which not only saves evacuation process but also contributes to the fabrication of high‐quality ceramic components with complex shape. Inspired by the DCC technology, direct coagulation casting of suspension through dispersant reaction method has been proposed recently, which shows its superiority in the coagulation temperature and time, and it has been proved to be a potential method for the near‐net‐shape fabrication of high‐performance ceramics.…”

Section: Introductionmentioning

confidence: 99%

Si₃N₄ Hollow Microsphere Toughened Porous Ceramics from Direct Coagulation Method via Dispersant Reaction

et al. 2018

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In order to realize the toughening effect of Si 3 N 4 hollow microsphere, direct coagulation casting method via dispersant reaction is utilized to form porous green bodies of Si 3 N 4 ceramics for the first time. It is found that the combination state between Si 3 N 4 hollow microsphere and ceramic matrix is enhanced due to its superiority on the coagulation mechanism. This novel colloidal forming method efficiently contributes to the close contact between hollow microspheres and ceramic particles, leading to the improvement of interface strength between the pore-former and ceramic matrix. More importantly, it is proved that ceramic hollow microspheres could well perform as both pore-former and toughening phase. The porosity regulation of porous ceramics is realized by tailoring ludox and carbon amount through carbothermal reduction method. This method turns out to regulate the performance of porous ceramics better especially through the sintering parameters. Porous Si 3 N 4 ceramics prepared with 5 wt% ludox addition which are treated in argon at 1400 C possesses the optimal performance. They possess the fracture toughness of 2.45 MPa Á m 1/2 , dielectric constant of 3.49, and thermal conductivity of 2.57 W/(m Á K), which have promising applications in radome materials. Figure 6. SEM images of porous Si 3 N 4 ceramics fabricated by (a) gelcasting and (c) dispersant reaction method, the corresponding interfaces between Si 3 N 4 hollow microspheres and matrix are shown in (b) and (d), respectively; their relevant fracture paths are shown in (e) and (f), respectively.

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Direct coagulation casting of silicon nitride suspension via a dispersant reaction method

Cited by 20 publications

References 21 publications

Direct coagulation casting of silicon carbide suspension via polyelectrolyte dispersant crosslink reaction

Direct coagulation casting of silicon carbide suspension via polyelectrolyte dispersant crosslink reaction

Granulation of Silicon Nitride Powders by Spray Drying: A Review

Si₃N₄ Hollow Microsphere Toughened Porous Ceramics from Direct Coagulation Method via Dispersant Reaction

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Direct coagulation casting of silicon nitride suspension via a dispersant reaction method

Cited by 20 publications

References 21 publications

Direct coagulation casting of silicon carbide suspension via polyelectrolyte dispersant crosslink reaction

Direct coagulation casting of silicon carbide suspension via polyelectrolyte dispersant crosslink reaction

Granulation of Silicon Nitride Powders by Spray Drying: A Review

Si3N4 Hollow Microsphere Toughened Porous Ceramics from Direct Coagulation Method via Dispersant Reaction

Contact Info

Product

Resources

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Si₃N₄ Hollow Microsphere Toughened Porous Ceramics from Direct Coagulation Method via Dispersant Reaction