Preparation of radiotransparent ceramic materials based on compositions of the BaO‒ZnO‒Al2O3‒SiO2 system

Fedorenko, E. Yu.; Lisachuk, H. V.; Bіlohubkina, K. V.; Kryvobok, Ruslan

doi:10.30525/978-9934-26-025-4-18

Cited by 2 publications

(1 citation statement)

References 3 publications

(5 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2b and Supplementary Fig. 9), we identify that the most suitable overlayer aluminate composition is BaAl 2 O 4 , and reject the more stable BaAl 4 O 7 and Ba 7 Al 64 O 103 because they require harsh synthesis conditions (>1100 °C) 31,32 .…”

Section: One-step Metal Encapsulation and Overlayer Functionalizationmentioning

confidence: 92%

Synthesis of core@shell catalysts guided by Tammann temperature

Xiong,

Xu,

et al. 2024

Nat Commun

View full text Add to dashboard Cite

Designing high-performance thermal catalysts with stable catalytic sites is an important challenge. Conventional wisdom holds that strong metal-support interactions can benefit the catalyst performance, but there is a knowledge gap in generalizing this effect across different metals. Here, we have successfully developed a generalizable strong metal-support interaction strategy guided by Tammann temperatures of materials, enabling functional oxide encapsulation of transition metal nanocatalysts. As an illustrative example, Co@BaAl2O4 core@shell is synthesized and tracked in real-time through in-situ microscopy and spectroscopy, revealing an unconventional strong metal-support interaction encapsulation mechanism. Notably, Co@BaAl2O4 exhibits exceptional activity relative to previously reported core@shell catalysts, displaying excellent long-term stability during high-temperature chemical reactions and overcoming the durability and reusability limitations of conventional supported catalysts. This pioneering design and widely applicable approach has been validated to guide the encapsulation of various transition metal nanoparticles for environmental tolerance functionalities, offering great potential to advance energy, catalysis, and environmental fields.

show abstract

Section: One-step Metal Encapsulation and Overlayer Functionalizationmentioning

confidence: 92%

Synthesis of core@shell catalysts guided by Tammann temperature

Xiong,

Xu,

et al. 2024

Nat Commun

View full text Add to dashboard Cite

show abstract

Technological aspects of the production of rocket fairings using radiotransparent ceramics of celsianwillemite composition

Fedorenko,

Lisachuk,

Bilohubkina

et al. 2023

SRRTC

View full text Add to dashboard Cite

The article presents the results of the development of recipes and technological parameters for producing rocket nose cones for highspeed, highly maneuverable aircraft. Considering that most of the radiotransparent ceramic materials existing today are monophase, the authors substantiate the need to use polyphase ceramics, including compounds with low thermal expansion, provided that their dielectric properties meet the requirements for radiotransparent materials (e = 1 ÷ 10, tgd ≤ 10–2). The developed compositions of celsianwillemite ceramics ensure the synthesis of target phases (Zn2SiO4 and BaAl2Si4O8) and the maximum degree of sintering at a temperature of 1200 °C which is 150 °C lower than known analogs. The use of Li2O additive in an amount of 2 wt. % (over 100 %) allows for the formation intensification of target phases and eliminates residual intermediate phases. A technology has been developed for the manufacture of thinwalled products of complex shapes using the slipcasting method. To regulate the properties of nonplastic slips, an additive is recommended that has a complex effect, manifested in increasing the fluidity of the slip, improving its filtration properties, and increasing the castings’ strength. The additive is introduced at the slip preparation stage and contains the diluting component (0.38 % Dolapix PC67) and the adhesive component (0.7 % PVA 1788) at a dosage over 100 % on a dry matter basis. A rational technological scheme and parameters for the manufacture of rocket nose cones from celsianwillemite ceramics have been developed. Products made from celsianwillemite ceramics are characterized by excellent dielectric (e = 2/41 ÷ 2.85; tgd = (0.2 ÷ 2.4)10–2) at a frequency of 1 MHz), physical and mechanical (scomp = 831 MPa, sbend = 207 MPa) and thermophysical (Dt = (225 ÷ 250) °С) properties, which ensure their operational reliability and efficient longterm operation.

show abstract

Preparation of radiotransparent ceramic materials based on compositions of the BaO‒ZnO‒Al2O3‒SiO2 system

Cited by 2 publications

References 3 publications

Synthesis of core@shell catalysts guided by Tammann temperature

Synthesis of core@shell catalysts guided by Tammann temperature

Technological aspects of the production of rocket fairings using radiotransparent ceramics of celsianwillemite composition

Contact Info

Product

Resources

About

Preparation of radiotransparent ceramic materials based on compositions of the BaO‒ZnO‒Al2O3‒SiO2 system

Cited by 2 publications

References 3 publications

Synthesis of core@shell catalysts guided by Tammann temperature

Synthesis of core@shell catalysts guided by Tammann temperature

Technological aspects of the production of rocket fairings using radio­transparent ceramics of celsian­willemite composition

Contact Info

Product

Resources

About

Technological aspects of the production of rocket fairings using radiotransparent ceramics of celsianwillemite composition