Enhancing the green mechanical strength of colloidal silica-bonded alumina castables using a silane coupling agent

Wang, Lingyun; Liang, Yonghe; Yin, Yansheng; Zhao, Lei; Cai, Manfei; Nie, Jianhua

doi:10.1016/j.ceramint.2016.04.045

Cited by 26 publications

(19 citation statements)

References 8 publications

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“…Compared to CAC, a colloidal binder (sol), when used in a castable, causes it to dry easily and reduces the likelihood of cracking and explosive spalling because of its highly permeable structure. Use of this binder also reduces the processing time due to its low mixing time, high permeability and high drying rate [4,8,23,25]. However, the most significant thing about colloidal binders is the low green mechanical strength of the refractory castables containing them.…”

Section: Colloidal Bindermentioning

confidence: 99%

“…Both mechanisms are affected by the pH change, particle size and concentration of particles in sol (silica, alumina, spinel, etc. ), the presence of electrolytes and organic liquids, and the temperature [4,15,[23][24][25][26].…”

Section: Colloidal Bindermentioning

confidence: 99%

“…castables containing colloidal binders is the amount of solid contents available in the sol or in the composition as well as the average particle size of the sol. It is recommended that a colloidal binder with an average particle size smaller than 14 nm and a high solid content should not be used in a castable, because these factors cause drying shrinkage and may lead to internal stresses and crack formation [15,20,[23][24][25].…”

Section: Colloidal Bindermentioning

confidence: 99%

“…By forming of Mg(OH) 2 and removing hydrogen ions from Si-OH groups, MgO enhances siloxane bond formation and ultimately increases the gelation rate. But the problem arises that the impact of MgO on the castable setting occurs so rapidly that it reduces the proper working time and decreases the flowability, thereby actually creating more hassles [4,15,23,26].…”

Section: Colloidal Bindermentioning

confidence: 99%

“…Although HA can be used as an optional binder in noncement castables, some drawbacks such as the need for longer mixing times until wet-out is achieved, as well as the risk of adding more water to the mix than recommended or risk due to the high specific surface area, can make it difficult to use. In addition, many researchers have reported that after HA comes into contact with water, a gel layer is formed on the surface of the HA particles, which results in a much less permeable structure, and the low permeability of the samples restricts the evaporation process and leads to a higher likelihood of explosive spalling during drying and initial heat-up [4,[18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

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Reasons for crack propagation and strength loss in refractory castables based on changes in their chemical compositions and micromorphologies with heating: special focus on the large blocks

Kazemi

2019

Journal of Asian Ceramic Societies

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Section: Colloidal Bindermentioning

confidence: 99%

Section: Colloidal Bindermentioning

confidence: 99%

Section: Colloidal Bindermentioning

confidence: 99%

Section: Colloidal Bindermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Reasons for crack propagation and strength loss in refractory castables based on changes in their chemical compositions and micromorphologies with heating: special focus on the large blocks

Kazemi

2019

Journal of Asian Ceramic Societies

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Facile Fabrication of a Mechanical, Chemical, Thermal, and Long‐Term Outdoor Durable Fluorine‐Free Superhydrophobic Coating

Tan

Wang

Huang

et al. 2021

Adv Materials Inter

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Despite their great self‐cleaning, anti‐dust, and anti‐icing properties superhydrophobic coatings show great promise in various practical applications in solar cells, car windows, powerlines, etc., superhydrophobic coatings encounter a large resistance in large‐scale practical applications due to their unsatisfactory long‐term mechanical, chemical, thermal, and weathering durability. This study demonstrates a cost‐effective, large‐scale applicable, mechanical, chemical, thermal, and long‐term weathering durable fluorine‐free superhydrophobic coating. This coating can be prepared with a simple spin‐coating or doctor‐blade painting or spray‐brush method, using SiO2 nanoparticles coated with methyl MQ silicone resin (Me‐MQ), and y‐methacryloxypropyltrimethoxysilane (KH‐570). This coating displays remarkable super‐hydrophobic performance with a large water contact angle of 168.8°, and a small sliding angle less than 1.0°, which survives tape peeling, sand impact, sandpaper abrasion, etching in acidic and alkaline environments, baking at high temperature up to 550 °C, and long‐term exposure to outdoor natural environment (under 16 months’ natural sunlight irradiation, UV irradiation, rain falls, high PM2.5, dust accumulation, etc.). The materials used are non‐fluorine, non‐toxic, environmentally friendly, and can be effectively applied to large glass surfaces using cost‐effective doctor‐blade painting and spray‐brush methods towards large‐scale applications. Therefore, this work can inspire and advance researches on superhydrophobic coatings towards practical applications.

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Composite manhole covers prepared with recycled printed circuit boards as a reinforcing filler

et al. 2017

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Waste circuit boards particles (CBPs) were utilized as a reinforcing filler to prepare bulk molding composites (BMCs) for the manufacture of composite manhole covers (CMCs) without reinforcing ribs. The effects of CBPs and conventional CaCO 3 on the mechanical properties of the BMCs were comparatively determined. Compared to CaCO 3 , CBPs showed a higher compatibility with unsaturated polyester resin (UPR) while effectively improving the fluidity of premix and the mechanical properties of the BMC. To enhance the interfacial adhesion between the glass fiber (GF) and UPR, three kinds of amine, epoxy, and vinyl modified silanes (namely KH-550, KH-560, and KH-570, respectively) were used. The surface tension (c) of the GF significantly decreased upon modification with the coupling agents. Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM) characterizations revealed a strong adhesion between the GF and UPR, thereby enhancing the mechanical properties of the composite material. The BMC material showed optimal flexural strengths upon addition of KH-560 and KH-570 coupling agents at 4 wt%. With the aim of evaluating its mechanical performance, a constant loading test combined with an ANSYS finite element analysis was performed over the prepared CMC. According to the constant loading test, the CMC material showed a stress loading of 7.8 tons, which was close to the value obtained by ANSYS simulation. POLYM. COMPOS., 00:000-000, 2017. V C 2017 Society of Plastics Engineers

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Enhancing the green mechanical strength of colloidal silica-bonded alumina castables using a silane coupling agent

Cited by 26 publications

References 8 publications

Reasons for crack propagation and strength loss in refractory castables based on changes in their chemical compositions and micromorphologies with heating: special focus on the large blocks

Reasons for crack propagation and strength loss in refractory castables based on changes in their chemical compositions and micromorphologies with heating: special focus on the large blocks

Facile Fabrication of a Mechanical, Chemical, Thermal, and Long‐Term Outdoor Durable Fluorine‐Free Superhydrophobic Coating

Composite manhole covers prepared with recycled printed circuit boards as a reinforcing filler

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