Preparation of SiC porous ceramics by a novel gelcasting method assisted with surface modification

Tian, Chao; Huang, Xin; Guo, Wei‐Ming; Gao, Pengzhao; Xiao, Huining

doi:10.1016/j.ceramint.2020.03.155

Cited by 24 publications

(7 citation statements)

References 46 publications

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“…The raw material used to prepare low toxicity gelcasting porous ceramic samples was similar to previous work [24,31,32,35,36]. Carboxymethyl cellulose (CMC) (ex Perancis Ashland France Blanose) was used as dispersant.…”

Section: Methodsmentioning

confidence: 99%

“…This approach has some drawbacks, including being difficult to make, needing high pressure, and necessitating the use of a porous template [23]. The gelcasting method is a well-known and straightforward method than the others and involves in situ polymerization in the slurry [23][24][25]. Also, the distributed polymer serves as a binder and pore template when released during the sintering process, and polyacrylamide is the commonly used polymer [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

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The Renewable of Low Toxicity Gelcasting Porous Ceramic as Fe2O3 Catalyst Support on Phenol Photodegradation

Putri¹,

Pratiwi²,

Tjahjanto³

et al. 2022

IJDNE

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Low toxicity gelcasting water-based method was conducted using a non-acrylamide system, with cassava starch and natural clay as poregenic agent and raw material, respectively, and the resulting porous ceramic was used as Fe2O3 catalyst support. The concentrations of cassava starch used were 1%, 3%, 5%, 7%, and 9%, the sintering process was performed based on the results of TGA/DTA thermal analysis. In addition, the sol-gel coating method was used to impregnate the Fe2O3 catalyst into the porous ceramic. BET results show that the pores formed in the ceramic body are micro pores with a size range of 21.41-23.27 Å, hence the concentration of cassava starch does not affect the pore characteristics. The morphology of SEM results also indicated the presence of pore formation in the ceramic body. According to the quantitative XRD analysis, the cassava concentration affects the percentage of catalyst impregnated. The highest percentage of Fe2O3 catalyst on 7% cassava starch was 41.15% and the phase of the catalyst successfully impregnated was α-Fe2O3with a rhombohedral structure. In addition, the highest percentage of phenol degradation was 59.15% with good performance after 8 times of recycling. In this study, we provide for the first time, utilization of Fe2O3-porous ceramics with a wonderful performance of recycling ability in the process of phenol photodegradation.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Renewable of Low Toxicity Gelcasting Porous Ceramic as Fe2O3 Catalyst Support on Phenol Photodegradation

Putri¹,

Pratiwi²,

Tjahjanto³

et al. 2022

IJDNE

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“…Tian et al prepared SiC porous ceramics via a gel injection molding technique with SiC slurries and studied the effect of the dispersant (TMAH) and gelling agent (Isobam) on the viscosity of the slurries. The result showed that the slurry containing 1 wt % TMAH and 1 wt % Isobam had the lowest viscosity, which was helpful for the injection molding process …”

Section: Introductionmentioning

confidence: 99%

“…The result showed that the slurry containing 1 wt % TMAH and 1 wt % Isobam had the lowest viscosity, which was helpful for the injection molding process. 15 The viscosity of the ceramic foaming slurries plays a key role in affecting the fluidity of the slurries, resulting in influencing the foam structure (the structure and size of the pores). Meanwhile, the foam stability was dependent on the thixotropy of the foaming slurries.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Thermal Insulation and Mechanical Strength of Fiberglass Porous Ceramics via Adjustment of the Structure of Pores

Chang

et al. 2023

ACS Appl. Eng. Mater.

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Fiberglass porous ceramics were prepared via a foam-gelcasting method. The relationship between the rheology of the slurries and the structure of the specimens was investigated. The results show that when the content of the dispersant was 0.25 wt %, the slurries exhibit excellent fluidity. The thixotropic behavior of the slurries was strongly influenced by the content of the foam stabilizer agent and solid content. Furthermore, as the fluidity of the foaming slurries increased, the size of the pores increased. At the same time, the thickness of the pore walls decreased gradually. In addition, promoting the uniform distribution of the pore size by improving the thixotropic behavior of the foaming slurries was beneficial. The optimal foaming slurry was composed of 65 wt % fiberglass, 0.25 wt % dispersant, and 0.1 wt % foam stabilizer agent. After calcination at 750 °C, fiberglass porous ceramics with 78.3% porosity, 2.2 MPa compressive strength, and 0.11 W m −1 K −1 thermal conductivity were obtained.

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“…So far, many examples involved in the application of the gel casting in forming silicon carbide green samples can be found in the reported literature [ 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ]. Tian et al [ 24 ] successfully prepared the SiC ceramics using the gel-casting process and proposed a pretreatment and surface modification method to avoid the problem that Isobam is difficult to crosslink and gelling with non-oxide ceramics. Jin et al [ 25 ] developed a novel ethylene glycol-based gel cast to prepare highly porous SiC ceramics, and the strength of green bodies was effectively increased.…”

Section: Introductionmentioning

confidence: 99%

A Finite Element Analysis for Improvement of Shaping Process of Complex-Shaped Large-Size Silicon Carbide Mirrors

et al. 2021

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In the gel-casting process, the proper selection of technological parameters is crucial for the final quality of a green body. In this work, the finite element method is used to investigate the mold characteristics in the gel-casting process, and the typical flow behaviors under different conditions are presented. Based on the distribution characteristics of temperature, pressure and flow field of gel polymer, the simulated results provide some possible reasons for the generation mechanisms of defects. Then, a series of simulations were performed to investigate the effect of process parameters on the molding quality of green gel-cast bodies. The results show that the decreasing loading speed can effectively reduce the number of defects and improve the molding quality. In addition, this paper presents a new technique by applying the exhaust hole to decrease the number of defects and, hence, improve structural integrity. The influence of the loading speed on the mold characteristics is well understood for the gating system with an exhaust hole, which suggests to us appropriate parameters for optimizing the molding design. This work provides a theoretical basis to explicate the generating mechanism of defects involved in the gel-casting process and acquires an optimized technique to produce a silicon carbide green body.

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Preparation of SiC porous ceramics by a novel gelcasting method assisted with surface modification

Cited by 24 publications

References 46 publications

The Renewable of Low Toxicity Gelcasting Porous Ceramic as Fe2O3 Catalyst Support on Phenol Photodegradation

The Renewable of Low Toxicity Gelcasting Porous Ceramic as Fe2O3 Catalyst Support on Phenol Photodegradation

Enhanced Thermal Insulation and Mechanical Strength of Fiberglass Porous Ceramics via Adjustment of the Structure of Pores

A Finite Element Analysis for Improvement of Shaping Process of Complex-Shaped Large-Size Silicon Carbide Mirrors

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