Effect of annealing conditions on the structure, phase and granulometry composition, and reflectance spectra and their changes on irradiation for calcium silicate powders

Гордиенко, П. С.; Михайлов, М. М.; Banerjee, Sushmita; Sharma, Yogesh Chandra; Yarusova, S. B.; Жевтун, И. Г.; Vlasov, V. A.; Shabalin, I. A.

doi:10.1016/j.matchemphys.2017.04.033

Cited by 16 publications

(4 citation statements)

References 24 publications

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“…According to the data obtained in [ 14 ], pseudowollastonite has the lowest integral solar absorption coefficient in comparison with other forms of calcium silicate. Therefore, the temperature (1200 °C) and the duration (5 h) of the annealing were chosen to provide complete transformation of wollastonite to pseudowollastonite.…”

Section: Resultsmentioning

confidence: 99%

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Influence of Titanium Surface Porosity on Adhesive Strength of Coatings Containing Calcium Silicate

et al. 2020

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Titanium-based alloys are widely used in aerospace engineering. They have good mechanical and corrosion properties but, in some cases, the material itself or the coating should meet some additional requirements. For example, it may be a requirement of high reflectance to provide effective temperature control. Wollastonite is a promising component for reflective coatings because it improves both their whiteness and mechanical properties. This paper presents the results of studying the composition, the structure and the adhesive strength of wollastonite-containing silicate coatings to titanium substrate. The surface of titanium samples was pre-treated by laser cladding with TiC and etching to provide surface porosity. It has been shown that such treatment allows a significantly increase in the adhesive strength of the coating to the substrate. A decrease in the adhesive strength was observed on titanium samples with an excess of TiO2 on the surface. This is caused by the formation of crystalline PbTiO3 at the interface.

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Section: Resultsmentioning

confidence: 99%

“…Previously [ 14 ], while studying the optical properties of calcium silicates formed in a CaCl 2 -Na 2 SiO 3 -H 2 O system, it was found that these silicates are characterized by high reflection coefficients at wavelengths up to 200 nm. The whiteness of the samples calculated from their reflection spectra was 95–98%.…”

Section: Introductionmentioning

confidence: 99%

Influence of Titanium Surface Porosity on Adhesive Strength of Coatings Containing Calcium Silicate

et al. 2020

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“…After 700 o C, the mass loss was reduced except for the samples in 80 o C pre-reactions. The exothermic reaction in the wide peak range between 800-850 o C represents the transition to wollastonite 1 Å phase [7,9,10]. Between 800-850 o C, exothermic peaks caused by water loss from structural hydroxyls.…”

Section: Resultsmentioning

confidence: 99%

Effect of Synthesis Parameters on Thermal Behaviour and Crystalline Structures of Calcium Silicate Minerals

Bozan¹,

Balcı²

2019

Proceedings of the 4th International Conference on Applied Research in Science, Technology and Knowledge

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Calcium silicates are porous, large surface area ultra-light minerals, whose diversity comes from close Ca/Si ratios. Anhydrate calcium silicate (C-S) wollastonite and hydrate calcium silicates (C-S-H) xonotlite and tobermorite are common varieties. The structures whose economic production is limited are widely used as heat insulation and fire resistant especially in places that require special shaped passive fire protection (PFP) plate. In use as cement additive, in addition to its effects on the strength properties of concrete, it also creates serious effects especially on the hydration process. By using CaO as a calcium and silica fume as a silica sources, with different Ca/Si (0.83, 1.00) and water/solid (10, 15) ratios in synthesis suspensions, directly or after the 4 hour pre-reaction under different temperature (40 o C < T <80 o C) synthesis of calcium silicate structures were carried out at an autogenous pressure of 200 o C applying or non-applying filtration after the pre-reaction. The products obtained were dried at room temperature, in oven at 60 o C and -110 o C freeze-drying techniques. Higher mass loss was observed with synthesis at 80 o C pre-reaction temperature and tobermorite phase synthesis condition. The removal of structural water and -OH which took place above 250 oC was found more tobermorite phase synthesis feed ratio sample. Typical C-S-H crystal peaks were detected in X-ray diffraction patterns. The decomposition of calcium hydrosilicate crystals in 320-600 o C and phase transforms between 800-875 o C had been observed. The increase in success of xonotlite synthesis with pre-reaction temperatures was seen in X-ray diffraction peaks. The slight decreases in the descriptive peaks intensities were observed for samples synthesized at 40 and 80 o C pre-reaction temperatures and calcined at 300 o C, while even the most severe peak decreased significantly in samples calcined at 700 o C.

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“…The latter includes hydrothermal (autoclave) and hydrochemical synthesis followed by dehydration of the resulting calcium hydrosilicates to produce wollastonite. These groups of methods are currently most actively studied, since they are promising from the standpoint of minimizing energy costs [ 43 , 44 , 45 , 46 ]. The establishment of the influence of the type and ratio of the initial components of the reaction mixture and synthesis conditions on the composition, structure, morphology, and functional properties of wollastonite as well as the systematization of the results for various multicomponent systems remains relevant at the present time.…”

Section: Introductionmentioning

confidence: 99%

UHMWPE/CaSiO3 Nanocomposite: Mechanical and Tribological Properties

et al. 2021

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This paper studied the effect of additives of 0.5–20 wt.% synthetic CaSiO3 wollastonite on the thermodynamic, mechanical, and tribological characteristics and structure of polymer composite materials (PCM) based on ultra-high-molecular weight polyethylene (UHMWPE). Using thermogravimetric analysis, X-ray fluorescence, scanning electron microscope, and laser light diffraction methods, it was shown that autoclave synthesis in the multicomponent system CaSO4·2H2O–SiO2·nH2O–KOH–H2O allows one to obtain neeindle-shaped nanosized CaSiO3 particles. It was shown that synthetic wollastonite is an effective filler of UHMWPE, which can significantly increase the deformation-strength and tribological characteristics of PCM. The active participation of wollastonite in tribochemical reactions occurring during friction of PCM by infrared spectroscopy was detected: new peaks related to oxygen-containing functional groups (hydroxyl and carbonyl) appeared. The developed UHMWPE/CaSiO3 materials have high wear resistance and can be used as triboengineering materials.

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Effect of annealing conditions on the structure, phase and granulometry composition, and reflectance spectra and their changes on irradiation for calcium silicate powders

Cited by 16 publications

References 24 publications

Influence of Titanium Surface Porosity on Adhesive Strength of Coatings Containing Calcium Silicate

Influence of Titanium Surface Porosity on Adhesive Strength of Coatings Containing Calcium Silicate

Effect of Synthesis Parameters on Thermal Behaviour and Crystalline Structures of Calcium Silicate Minerals

UHMWPE/CaSiO3 Nanocomposite: Mechanical and Tribological Properties

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