The Experts below are selected from a list of 186 Experts worldwide ranked by ideXlab platform

Richu Wang - One of the best experts on this subject based on the ideXlab platform.

  • colloidal processing of zno using thermosensitive poly n isopropylacrylamide as a Coagulating Agent
    Ceramics International, 2015
    Co-Authors: Xiaofeng Wang, Chaoqun Peng, Dou Zhang, Yixin Chen, Richu Wang
    Abstract:

    Abstract A novel colloidal processing method is used to prepare near-net-shaped ceramic components directly from suspension. ZnO ceramic components are fabricated using thermosensitive poly(N-isopropylacrylamide) as a coagulation Agent. This allows the suspension to consolidate at temperatures above the casting temperature. Low-melting-point paraffin wax is used as the lost mold material. This eliminates the demolding step, through draining at temperatures above the consolidation temperature. The rheology and gelling behavior of the ZnO suspensions is evaluated at different temperatures. A suspension containing 8 mg/mL poly(N-isopropylacrylamide) with a solid loading of 50 vol% is appropriate for casting at low temperature and consolidating at high temperature. Wrinkling and cracking are not observed in the surfaces of the resulting green bodies. The microstructures of the sintered ceramics are homogeneous, and exhibit a density of 97.9% of the theoretical density.

  • short communication colloidal processing of zno using thermosensitive poly n isopropylacrylamide as a Coagulating Agent
    2015
    Co-Authors: Xiaofeng Wang, Chaoqun Peng, Dou Zhang, Yixin Chen, Richu Wang
    Abstract:

    A novel colloidal processing method is used to prepare near-net-shaped ceramic components directly from suspension. ZnO ceramic components are fabricated using thermosensitive poly(N-isopropylacrylamide) as a coagulation Agent. This allows the suspension to consolidate at temperatures above the casting temperature. Low-melting-point paraffin wax is used as the lost mold material. This eliminates the demolding step, through draining at temperatures above the consolidation temperature. The rheology and gelling behavior of the ZnO suspensions is evaluated at different temperatures. A suspension containing 8 mg/mL poly(N-isopropylacrylamide) with a solid loading of 50 vol% is appropriate for casting at low temperature and consolidating at high temperature. Wrinkling and cracking are not observed in the surfaces of the resulting green bodies. The microstructures of the sintered ceramics are homogeneous, and exhibit a density of 97.9% of the theoretical density. & 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

Xiaofeng Wang - One of the best experts on this subject based on the ideXlab platform.

  • colloidal processing of zno using thermosensitive poly n isopropylacrylamide as a Coagulating Agent
    Ceramics International, 2015
    Co-Authors: Xiaofeng Wang, Chaoqun Peng, Dou Zhang, Yixin Chen, Richu Wang
    Abstract:

    Abstract A novel colloidal processing method is used to prepare near-net-shaped ceramic components directly from suspension. ZnO ceramic components are fabricated using thermosensitive poly(N-isopropylacrylamide) as a coagulation Agent. This allows the suspension to consolidate at temperatures above the casting temperature. Low-melting-point paraffin wax is used as the lost mold material. This eliminates the demolding step, through draining at temperatures above the consolidation temperature. The rheology and gelling behavior of the ZnO suspensions is evaluated at different temperatures. A suspension containing 8 mg/mL poly(N-isopropylacrylamide) with a solid loading of 50 vol% is appropriate for casting at low temperature and consolidating at high temperature. Wrinkling and cracking are not observed in the surfaces of the resulting green bodies. The microstructures of the sintered ceramics are homogeneous, and exhibit a density of 97.9% of the theoretical density.

  • short communication colloidal processing of zno using thermosensitive poly n isopropylacrylamide as a Coagulating Agent
    2015
    Co-Authors: Xiaofeng Wang, Chaoqun Peng, Dou Zhang, Yixin Chen, Richu Wang
    Abstract:

    A novel colloidal processing method is used to prepare near-net-shaped ceramic components directly from suspension. ZnO ceramic components are fabricated using thermosensitive poly(N-isopropylacrylamide) as a coagulation Agent. This allows the suspension to consolidate at temperatures above the casting temperature. Low-melting-point paraffin wax is used as the lost mold material. This eliminates the demolding step, through draining at temperatures above the consolidation temperature. The rheology and gelling behavior of the ZnO suspensions is evaluated at different temperatures. A suspension containing 8 mg/mL poly(N-isopropylacrylamide) with a solid loading of 50 vol% is appropriate for casting at low temperature and consolidating at high temperature. Wrinkling and cracking are not observed in the surfaces of the resulting green bodies. The microstructures of the sintered ceramics are homogeneous, and exhibit a density of 97.9% of the theoretical density. & 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

Kuttan Prabhakaran - One of the best experts on this subject based on the ideXlab platform.

  • Magnesia induced coagulation of aqueous PZT powder suspensions for direct coagulation casting
    Ceramics International, 2010
    Co-Authors: Kuttan Prabhakaran, K. Joseph, R. Sooraj, C. Durgaprasad
    Abstract:

    Abstract Coagulation characteristics of poly(acrylate) dispersed PZT powder suspensions by MgO Coagulating Agent have been studied. The PZT powder suspensions undergoes coagulation at MgO concentrations much lower than the equivalent amount to react with the dispersant indicating a major shift in the coagulation mechanism from the corresponding alumina powder suspensions. Unlike in alumina powder suspensions, the Mg 2+ ions generated from the MgO reacts with the ammonium poly(acrylate) adsorbed on particle surface that result in cross-linking of PZT particles by Mg 2+ through the ammonium poly(acrylate) molecules. The particle bridging induces faster coagulation of the slurry cast in a mould as required for an ideal DCC process. The compressive strength and stability against oscillatory stresses of the wet-coagulated bodies increased with increase in number of cross-links between the particles. The PZT green bodies prepared by the DCC process sintered to near theoretical density and the MgO added as Coagulating Agent (∼0.1 wt%) had only minor influence on its piezoelectric characteristics.

  • direct coagulation casting of ysz powder suspensions using mgo as Coagulating Agent
    Ceramics International, 2009
    Co-Authors: Kuttan Prabhakaran, Anand Melkeri, N M Gokhale, T K Chongdar, S C Sharma
    Abstract:

    Direct coagulation casting (DCC) of aqueous 8 wt% yttria stabilized zirconia (YSZ) powder suspensions prepared using ammonium poly(acrylate) dispersant has been studied using MgO as Coagulating Agent. Small amount ( 98% TD at 1550 °C.

  • A new direct coagulation casting process for alumina slurries prepared using poly(acrylate) dispersant
    Ceramics International, 2009
    Co-Authors: Kuttan Prabhakaran, Anand Melkeri, N M Gokhale, R. Sooraj, Srikant Sharma
    Abstract:

    Abstract Direct coagulation casting (DCC) of concentrated aqueous alumina slurries prepared using ammonium poly(acrylate) dispersant has been studied using MgO as Coagulating Agent. Addition of small amounts of MgO increased the viscosity of the concentrated alumina slurries with time and finally transformed it in to a stiff gel. Sufficient working time for degassing and casting could be achieved by cooling the slurries to a temperature of ∼5 °C after proper homogenization after the addition of MgO. The DCC slip with alumina loading in the range of 50–55 vol% showed relatively low viscosity (0.12–0.36 Pa s at shear rate of 93 s −1 ) and yield stress (1.96–10.56 Pa) values. The wet coagulated bodies prepared from slurries of alumina loading in the range of 50–55 vol% had enough compressive strength (45–211 kPa) for handling during mould removal and further drying. The coagulated bodies prepared from slurries of alumina loading in the range of 50–55 vol% showed linear shrinkage in the range of 4.8–2.3 during drying and 17.1–16.2 during sintering respectively. Near-net-shape alumina components with density >98% TD could be prepared by the DCC process.

  • mechanical properties of wet coagulated alumina bodies prepared by direct coagulation casting using a mgo Coagulating Agent
    Journal of the American Ceramic Society, 2008
    Co-Authors: Kuttan Prabhakaran, Anand Melkeri, N M Gokhale, Shekhar Parshuram Tambe, S C Sharma
    Abstract:

    High strength and Young's modulus of wet-coagulated bodies is key to the success of a direct coagulation casting (DCC) process. The yield strength and Young's modulus of wet-coagulated alumina bodies prepared at various concentrations of ammonium poly(acrylate) dispersant and MgO Coagulating Agent has been evaluated. The yield strength and Young's modulus of the wet-coagulated bodies, prepared at a MgO concentration equivalent to react with the dispersant, increased with an increase in the dispersant concentration due to the binding of alumina particles by the Mg-poly(acrylate) formed by the reaction between the dispersant and MgO. Addition of MgO higher than the equivalent amount to react with the dispersant increased the yield strength, Young's modulus, and brittleness of the wet-coagulated bodies. This is due to a combination of an increase in the cohesive force between particles and a decrease in homogeneity of the particle network in the wet-coagulated body induced by heterocoagulation of alumina and MgO particles having opposite surface charges. The high yield strength (up to 472 kPa) and Young's modulus (up to 110 MPa) achieved would facilitate easy and successful removal of the wet-coagulated bodies even from intricate shape molds.

  • Mechanical Properties of Wet‐Coagulated Alumina Bodies Prepared by Direct Coagulation Casting Using a MgO Coagulating Agent
    Journal of the American Ceramic Society, 2008
    Co-Authors: Kuttan Prabhakaran, Anand Melkeri, N M Gokhale, Shekhar Parshuram Tambe, S C Sharma
    Abstract:

    High strength and Young's modulus of wet-coagulated bodies is key to the success of a direct coagulation casting (DCC) process. The yield strength and Young's modulus of wet-coagulated alumina bodies prepared at various concentrations of ammonium poly(acrylate) dispersant and MgO Coagulating Agent has been evaluated. The yield strength and Young's modulus of the wet-coagulated bodies, prepared at a MgO concentration equivalent to react with the dispersant, increased with an increase in the dispersant concentration due to the binding of alumina particles by the Mg-poly(acrylate) formed by the reaction between the dispersant and MgO. Addition of MgO higher than the equivalent amount to react with the dispersant increased the yield strength, Young's modulus, and brittleness of the wet-coagulated bodies. This is due to a combination of an increase in the cohesive force between particles and a decrease in homogeneity of the particle network in the wet-coagulated body induced by heterocoagulation of alumina and MgO particles having opposite surface charges. The high yield strength (up to 472 kPa) and Young's modulus (up to 110 MPa) achieved would facilitate easy and successful removal of the wet-coagulated bodies even from intricate shape molds.

S C Sharma - One of the best experts on this subject based on the ideXlab platform.

  • direct coagulation casting of ysz powder suspensions using mgo as Coagulating Agent
    Ceramics International, 2009
    Co-Authors: Kuttan Prabhakaran, Anand Melkeri, N M Gokhale, T K Chongdar, S C Sharma
    Abstract:

    Direct coagulation casting (DCC) of aqueous 8 wt% yttria stabilized zirconia (YSZ) powder suspensions prepared using ammonium poly(acrylate) dispersant has been studied using MgO as Coagulating Agent. Small amount ( 98% TD at 1550 °C.

  • mechanical properties of wet coagulated alumina bodies prepared by direct coagulation casting using a mgo Coagulating Agent
    Journal of the American Ceramic Society, 2008
    Co-Authors: Kuttan Prabhakaran, Anand Melkeri, N M Gokhale, Shekhar Parshuram Tambe, S C Sharma
    Abstract:

    High strength and Young's modulus of wet-coagulated bodies is key to the success of a direct coagulation casting (DCC) process. The yield strength and Young's modulus of wet-coagulated alumina bodies prepared at various concentrations of ammonium poly(acrylate) dispersant and MgO Coagulating Agent has been evaluated. The yield strength and Young's modulus of the wet-coagulated bodies, prepared at a MgO concentration equivalent to react with the dispersant, increased with an increase in the dispersant concentration due to the binding of alumina particles by the Mg-poly(acrylate) formed by the reaction between the dispersant and MgO. Addition of MgO higher than the equivalent amount to react with the dispersant increased the yield strength, Young's modulus, and brittleness of the wet-coagulated bodies. This is due to a combination of an increase in the cohesive force between particles and a decrease in homogeneity of the particle network in the wet-coagulated body induced by heterocoagulation of alumina and MgO particles having opposite surface charges. The high yield strength (up to 472 kPa) and Young's modulus (up to 110 MPa) achieved would facilitate easy and successful removal of the wet-coagulated bodies even from intricate shape molds.

  • Mechanical Properties of Wet‐Coagulated Alumina Bodies Prepared by Direct Coagulation Casting Using a MgO Coagulating Agent
    Journal of the American Ceramic Society, 2008
    Co-Authors: Kuttan Prabhakaran, Anand Melkeri, N M Gokhale, Shekhar Parshuram Tambe, S C Sharma
    Abstract:

    High strength and Young's modulus of wet-coagulated bodies is key to the success of a direct coagulation casting (DCC) process. The yield strength and Young's modulus of wet-coagulated alumina bodies prepared at various concentrations of ammonium poly(acrylate) dispersant and MgO Coagulating Agent has been evaluated. The yield strength and Young's modulus of the wet-coagulated bodies, prepared at a MgO concentration equivalent to react with the dispersant, increased with an increase in the dispersant concentration due to the binding of alumina particles by the Mg-poly(acrylate) formed by the reaction between the dispersant and MgO. Addition of MgO higher than the equivalent amount to react with the dispersant increased the yield strength, Young's modulus, and brittleness of the wet-coagulated bodies. This is due to a combination of an increase in the cohesive force between particles and a decrease in homogeneity of the particle network in the wet-coagulated body induced by heterocoagulation of alumina and MgO particles having opposite surface charges. The high yield strength (up to 472 kPa) and Young's modulus (up to 110 MPa) achieved would facilitate easy and successful removal of the wet-coagulated bodies even from intricate shape molds.

Dou Zhang - One of the best experts on this subject based on the ideXlab platform.

  • colloidal processing of zno using thermosensitive poly n isopropylacrylamide as a Coagulating Agent
    Ceramics International, 2015
    Co-Authors: Xiaofeng Wang, Chaoqun Peng, Dou Zhang, Yixin Chen, Richu Wang
    Abstract:

    Abstract A novel colloidal processing method is used to prepare near-net-shaped ceramic components directly from suspension. ZnO ceramic components are fabricated using thermosensitive poly(N-isopropylacrylamide) as a coagulation Agent. This allows the suspension to consolidate at temperatures above the casting temperature. Low-melting-point paraffin wax is used as the lost mold material. This eliminates the demolding step, through draining at temperatures above the consolidation temperature. The rheology and gelling behavior of the ZnO suspensions is evaluated at different temperatures. A suspension containing 8 mg/mL poly(N-isopropylacrylamide) with a solid loading of 50 vol% is appropriate for casting at low temperature and consolidating at high temperature. Wrinkling and cracking are not observed in the surfaces of the resulting green bodies. The microstructures of the sintered ceramics are homogeneous, and exhibit a density of 97.9% of the theoretical density.

  • short communication colloidal processing of zno using thermosensitive poly n isopropylacrylamide as a Coagulating Agent
    2015
    Co-Authors: Xiaofeng Wang, Chaoqun Peng, Dou Zhang, Yixin Chen, Richu Wang
    Abstract:

    A novel colloidal processing method is used to prepare near-net-shaped ceramic components directly from suspension. ZnO ceramic components are fabricated using thermosensitive poly(N-isopropylacrylamide) as a coagulation Agent. This allows the suspension to consolidate at temperatures above the casting temperature. Low-melting-point paraffin wax is used as the lost mold material. This eliminates the demolding step, through draining at temperatures above the consolidation temperature. The rheology and gelling behavior of the ZnO suspensions is evaluated at different temperatures. A suspension containing 8 mg/mL poly(N-isopropylacrylamide) with a solid loading of 50 vol% is appropriate for casting at low temperature and consolidating at high temperature. Wrinkling and cracking are not observed in the surfaces of the resulting green bodies. The microstructures of the sintered ceramics are homogeneous, and exhibit a density of 97.9% of the theoretical density. & 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.