In situ synthesis of porous ceramics with a framework structure of magnesium borate whiskers

Chen, Shanhua; Zhang, Dafu; Sun, Gang

doi:10.1016/j.matlet.2014.01.064

Cited by 20 publications

(6 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As reported in our previous papers [13,14], the whole transformation of mullite whiskers from the raw materials was achieved at 1100 °C through the vapor-solid reaction, followed by the whisker growth and necking formation through vapor transport and volume diffusion with increasing temperature and prolonged soaking time. As can be seen from figure 3(b), a good linear relationship between linear shrinkages of the mullite whiskers frameworks and the function of t 2/5 indicated the existence of volume diffusion during the sintering for the formation of sintering necks, which was induced by oxygen vacancies present in mullite whiskers [18][19][20]. The volume diffusion was also contributed to the whisker bonding as well as mechanical behavior.…”

Section: Resultsmentioning

confidence: 83%

Effect of heating parameters on sintering behaviors and properties of mullite whisker frameworks

et al. 2018

View full text Add to dashboard Cite

Mullite whisker frameworks were fabricated by vapor-solid reaction with SiO2, Al2O3 and AlF3 powders as the whisker forming agent at high temperatures. The effects of heating temperature and soaking time on the weight loss, liner shrinkage, porosity, microstructure and compressive strength were investigated. The results showed that with the increasing of the sintering temperature and soaking time, the weight loss and liner shrinkage of the samples increased and the porosities decreased due to the accelerated vapor-solid reaction, resulting in strong bonding and grain growth of the mullite frameworks. The compressive strength of the samples increased with increasing the sintering temperature from 1500 to 1650°C, and decreased with the soaking time extended to more than 5 h for 1500°C and 2 h for 1650°C. A maximum compressive strength of 142 MPa at a porosity of 62.3% was obtained for the mullite whisker framework heated at 1500°C for 5 h. The enhanced strength was attributed to the strong bonding strength and fine mullite grains resulting from a relative lower heating temperature and a modest soaking time.

show abstract

Section: Resultsmentioning

confidence: 83%

Effect of heating parameters on sintering behaviors and properties of mullite whisker frameworks

et al. 2018

View full text Add to dashboard Cite

show abstract

“…α‐Alumina powder (α‐Al 2 O 3 , ≥99.0%, Dengfeng Chemical Reagent Factory), TiO 2 (≥99.0%, Yuxing Chemical Co., Ltd.), silica micropowder (SiO 2 , Jingshengyuan Silica Micropowder Co., Ltd.), seafoam (Mg 8 Si 12 O 30 (OH) 4 (OH 2 ) 4 ·8H 2 O, Hebei Qiangdong Mineral Processing Factory), Al 2 O 3 powders (≥99.0%, 1 μm, Anmai Aluminium Industry Co., Ltd.), SiO 2 powders (≥99.0%, Donghai Jingshengyuan Silicon Powder Co., Ltd.), and AlF 3 powders (≥99.0%, Sinopharm Chemical Reagent Co., Ltd.) were used to prepared mullite whisker 39,40 . The following reagents were purchased from Sinopharm Chemical Reagent Co., Ltd: polyvinyl alcohol ((C 2 H 4 O) n , ≥99%), anhydrous sodium sulfite (Na 2 SO 3 , AR), tert‐butanol (C 4 H 10 O, AR), copper nitrate trihydrate (Cu(NO 3 ) 2 ·3H 2 O, AR), ammonium fluoride (NH 4 F, GR), and urea (CH 4 N 2 O, AR).…”

Section: Methodsmentioning

confidence: 99%

Fabrication of Cu_1.4Mn_1.6O₄ modified catalytic ozonation ceramic membrane for membrane fouling elimination and micro‐pollutant degradation

Zhao

Gao

et al. 2023

J Am Ceram Soc.

View full text Add to dashboard Cite

In this experiment, a novel catalytic ceramic membrane (CCM) with spherical Cu1.4Mn1.6O4 material loading was prepared through hydrothermal in situ growth method. The synergistic effects of membrane separation and catalytic ozonation on membrane antipollution and degradation of micro‐pollutants were systematically investigated. The results indicated that the degradation efficiency of bisphenol A by CCMs reached 85.7% with a stable normalized flux of 0.90 under the operating conditions of [O3] = 4 g/h, transmembrane pressure = 0.2 bar, and pH = 6. In addition, the results showed that the composite bimetallic oxides have good stability by measuring the leaching concentration of metal ions during the catalytic process. This study provides a promising strategy for in situ growth of catalytically active composite bimetallic oxides on the surfaces of ceramic membrane and for mitigation of membrane fouling complex water treatment.

show abstract

“…In this synthesis procedure, the main drawback of solid-state is the requirement of grinding and sieving processes after the solid-state reaction. Chen et al [47] used capping agent addition of Ni(NO 3 ) 2 to eliminate these extra processes of the solidstate synthesis procedure [47].…”

Section: Solid-state (Thermal) Synthesismentioning

confidence: 99%

Magnesium Borates: The Relationship between the Characteristics, Properties, and Novel Technologies

Dumanli¹

2022

Current Trends in Magnesium (Mg) Research

View full text Add to dashboard Cite

Magnesium borates are compounds including mainly magnesium (Mg), boron (B) oxygen (O), and hydrogen (H). Magnesium borates are traditionally famous for their strong thermoluminescence, mechanical and thermal features due to their high elasticity coefficient, corrosion, and heat resistance. Because of being beneficial, especially in the applications such as thermoluminescence and X-ray screening, and ease of synthesis, magnesium borates are produced by using different experimental procedures exhibiting different characteristics. Main traditional synthesis techniques can be classified as liquid state and solid-state synthesis methods. With the help of novelties in synthesis technology, new techniques are beginning to emerge in magnesium borate syntheses such as hybrid synthesis, ultrasound, microwave, and capping agent addition. The strengthened characteristics of the compounds would lead to new applications such as stomach cancer chemotherapy and wastewater treatment. In this chapter, it is aimed to make a comparison between the characteristics of synthesized magnesium borates and their properties. In addition, new types of magnesium borates obtained by various synthetic techniques are expected to be useful for industrial applications such as space technology, radiation dosimetry, X-ray screening, ion batteries, and hydrocarbon reaction catalysis. Such classification of properties and the synthesis techniques will enlighten the relationship between the characteristics and novel applications of magnesium borates.

show abstract

In situ synthesis of porous ceramics with a framework structure of magnesium borate whiskers

Cited by 20 publications

References 15 publications

Effect of heating parameters on sintering behaviors and properties of mullite whisker frameworks

Effect of heating parameters on sintering behaviors and properties of mullite whisker frameworks

Fabrication of Cu_1.4Mn_1.6O₄ modified catalytic ozonation ceramic membrane for membrane fouling elimination and micro‐pollutant degradation

Magnesium Borates: The Relationship between the Characteristics, Properties, and Novel Technologies

Contact Info

Product

Resources

About

In situ synthesis of porous ceramics with a framework structure of magnesium borate whiskers

Cited by 20 publications

References 15 publications

Effect of heating parameters on sintering behaviors and properties of mullite whisker frameworks

Effect of heating parameters on sintering behaviors and properties of mullite whisker frameworks

Fabrication of Cu1.4Mn1.6O4 modified catalytic ozonation ceramic membrane for membrane fouling elimination and micro‐pollutant degradation

Magnesium Borates: The Relationship between the Characteristics, Properties, and Novel Technologies

Contact Info

Product

Resources

About

Fabrication of Cu_1.4Mn_1.6O₄ modified catalytic ozonation ceramic membrane for membrane fouling elimination and micro‐pollutant degradation