Investigation of B4C for inhibiting crystallization in silica at high temperatures

Crystal, Isabel R.; Schauer, Ben; Converse, Elizabeth Sobalvarro; Cahill, James T.; Du Frane, Wyatt L.; King, Gabriella C.S.

doi:10.1016/j.ceramint.2024.03.035

Title: Investigation of B₄C for inhibiting crystallization in silica at high temperatures

Journal Article · 04 March 2024 · Ceramics International

DOI: https://doi.org/10.1016/j.ceramint.2024.03.035 · OSTI ID:2375418

^[1]; Schauer, Ben ^[1]; Converse, Elizabeth Sobalvarro ^[1]; Cahill, James T. ^[1]; Du Frane, Wyatt L. ^[1];

^[1]

Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Amorphous silica has numerous high temperature applications due to its inherent thermal shock resistance and low coefficient of thermal expansion (CTE). However, at the high temperatures required for processing (>1200 °C), the metastable β-cristobalite phase preferentially forms and is accompanied by a volume change, and potential cracking, upon conversion to the low temperature α-cristobalite phase. The CTE of the final crystalline phase is an order of magnitude higher than its amorphous counterpart. Here experimental results demonstrate that small additions of B₄C (3.5 wt%) effectively inhibit silica crystallization in powder and sintered gel-cast forms up to 22h at temperatures as high as 1500°C as confirmed via x-ray diffraction. Further, the oxidation of B₄C to B₂O₃ and its subsequent melt and evaporation disrupts the nucleation and growth of the cristobalite phase. The mechanism for crystallization inhibition is further explored through optical microscopy to probe changes in surface morphology.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); Defense Advanced Research Projects Agency (DARPA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 2375418

Report Number(s):: LLNL-JRNL-854285; 1081398

Journal Information:: Ceramics International, Journal Name: Ceramics International Journal Issue: 11 Vol. 50; ISSN 0272-8842

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Investigation of B4C for inhibiting crystallization in silica at high temperatures

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Title: Investigation of B₄C for inhibiting crystallization in silica at high temperatures