Magnesia induced coagulation of aqueous PZT powder suspensions for direct coagulation casting

Prabhakaran, K.; Joseph, Kuruvilla; Sooraj, R.; Durgaprasad, C.

doi:10.1016/j.ceramint.2010.05.020

Cited by 11 publications

(4 citation statements)

References 24 publications

(59 reference statements)

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“…Flocculation processes include direct coagulation casting [9] and hydrolysis-assisted solidification [10]. These form a particle network, by minimizing electrostatic repulsion through shifting the pH toward the isoelectric point [9] or increasing the ionic strength [11]. Gelation processes include gel-casting [3], which creates a three-dimensional network in situ in the suspending liquid.…”

Section: Introductionmentioning

confidence: 99%

Colloidal processing of ZnO using thermosensitive poly(N-isopropylacrylamide) as a coagulating agent

Sun

Peng

Zhang

et al. 2015

Ceramics International

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Section: Introductionmentioning

confidence: 99%

Colloidal processing of ZnO using thermosensitive poly(N-isopropylacrylamide) as a coagulating agent

Sun

Peng

Zhang

et al. 2015

Ceramics International

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“…13,14 Prabhakaran et al studied DCC by MgO as coagulant and investigated the rheological behavior of suspension. 15,16 Xu et al proposed the coagulation of alumina suspension via controlled release of high valence counter ions. 17,18 In the methods described above, all suspensions used in DCC process are electrostatic or electrosteric stable.…”

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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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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“…Unlike gelcasting technique, direct coagulation casting (DCC) utilizes the suspended state of particles in high solid‐loading ceramic slurry, which could be regulated by shifting the pH value of suspension toward to the isoelectric point (IEP) or increasing ionic strength to complete the transition from repulsive to attractive state . 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.…”

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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Magnesia induced coagulation of aqueous PZT powder suspensions for direct coagulation casting

Cited by 11 publications

References 24 publications

Colloidal processing of ZnO using thermosensitive poly(N-isopropylacrylamide) as a coagulating agent

Colloidal processing of ZnO using thermosensitive poly(N-isopropylacrylamide) as a coagulating agent

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

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

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Magnesia induced coagulation of aqueous PZT powder suspensions for direct coagulation casting

Cited by 11 publications

References 24 publications

Colloidal processing of ZnO using thermosensitive poly(N-isopropylacrylamide) as a coagulating agent

Colloidal processing of ZnO using thermosensitive poly(N-isopropylacrylamide) as a coagulating agent

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

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

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Product

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