Preparation of high-porous SiC ceramics from polymeric composites based on diatomite powder

Симоненко, Е. П.; Симоненко, Н. П.; Zharkov, M. A.; Shembel, N. L.; Simonov-Emel’yanov, I. D.; Sevastyanov, V. G.; Кузнецов, Н. Т.

doi:10.1007/s10853-014-8633-1

Cited by 16 publications

(2 citation statements)

References 29 publications

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“…strength of porous ceramics includes microstructure as well as the grain size, nature of binder, sintering temperatures, bonding necks between particles, porosity, pore size distribution, pore shapes and flaws [25]. Carbothermal synthesis of highly porous SiC ceramics with porosity of 82-84 % were prepared by means of polymeric technology and natural raw material at the temperature of 1400°C shows the compressive strength value in the range of 3.7-6.3 MPa [26]. Highly porous SiC foams were fabricated by polymeric sponge method with 10 % bentonite addition to the SiC particles gives foam maximum compressive strength of 2.44 MPa at 1100°C [27].…”

Section: Resultsmentioning

confidence: 99%

Processing of silica bonded porous SiC preform for metallic composites

et al. 2015

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Porous SiC ceramics were successfully fabricated by silica bonding of SiC compacts and porogen burnout technique. Silica coating on SiC particle was carried out using TEOS hydrolysis and crystallizes during the sintering process at 1200°C, which forms a well-developed neck growth between the SiC particles. Different volume fractions of sodium chloride porogen were used to obtain varied porosity content in porous SiC ceramics from 36 to 62.47 % leading to wide-ranging compressive strength from 8.11 to 0.69 MPa. Interconnected bimodal pores were created throughout the sample due to the burnt out of salt and stacking of SiC particles. The pore size distribution of porous SiC measured using mercury intrusion porosimetry shows that average pore size due to the salt particle is around 74-110 lm and stacking of SiC particle result 4-10 lm. Direct squeeze infiltration method is successfully adopted for infiltration of 6061 aluminium molten alloy into SiC preforms with the controlled process parameters of initial preform temperature, liquid metal superheating, squeezed pressure and its rate of application and die temperature. Microstructures have shown complete infiltration of Al alloy into the pores of the SiC preform forming Al composite with good interfacial bonding aided by the presence of MgAl 2 O 4 spinel. The silica coating on SiC surface have a multifunctional role of acting as a binder for the porous preform, enhances the wettability of SiC particle with molten metal during infiltration and prevention of deleterious Al 4 C 3 interfacial reaction product.

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Section: Resultsmentioning

confidence: 99%

Processing of silica bonded porous SiC preform for metallic composites

et al. 2015

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“…In some studies, natural diatomite is treated thermally [3,10,20,33,34], with acids [3,20,[35][36][37], or with alkalines [4,37,38] to enhance its application performance. Other studies use diatomite as a raw material to manufacture other products [14,35,[39][40][41][42]. The diatomite purified by calcining is also investigated by Yuan et al [43].…”

Section: Introductionmentioning

confidence: 99%

Single and Binary Adsorption Systems of Rhodamine B and Methylene Blue onto Alkali-Activated Vietnamese Diatomite

Danh

2021

Adsorption Science & Technology

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Diatomite was slightly modified with a sodium hydroxide solution. The resulting material was characterized by using energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and nitrogen adsorption-desorption isotherms. The so-treated diatomite has a high specific surface area (77.8 m2/g) and a high concentration of isolated silanol groups on the surface, and therefore, its adsorption capacity increases drastically in both the single and binary adsorption systems for rhodamine B and methylene blue. The binary system is more effective than the single system, with methylene blue being adsorbed more than rhodamine B. The adsorption process is spontaneous and fits well with the Langmuir isothermal model, and it depends on pH significantly.

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Local structure and magnetic properties of Mn and Co co-doped SiC films

Sun

Wang

et al. 2018

J Mater Sci: Mater Electron

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Preparation of high-porous SiC ceramics from polymeric composites based on diatomite powder

Cited by 16 publications

References 29 publications

Processing of silica bonded porous SiC preform for metallic composites

Processing of silica bonded porous SiC preform for metallic composites

Single and Binary Adsorption Systems of Rhodamine B and Methylene Blue onto Alkali-Activated Vietnamese Diatomite

Local structure and magnetic properties of Mn and Co co-doped SiC films

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