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DOE OSTI2020

Materials Data on RbSn by Materials Project

RbSn crystallizes in the tetragonal I4_1/acd space group. The structure is three-dimensional. there are two inequivalent Rb sites. In the first Rb site, Rb is bonded in a 12-coordinate geometry to eight equivalent Sn atoms. There are a spread of Rb–Sn bond distances ranging from 3.94–4.00 Å. In the second Rb site, Rb is bonded in a 6-coordinate geometry to six equivalent Sn atoms. There are a spread of Rb–Sn bond distances ranging from 3.89–4.04 Å. Sn is bonded in a 10-coordinate geometry to seven Rb and three equivalent Sn atoms. There are one shorter (3.00 Å) and two longer (3.01 Å) Sn–Sn bond lengths.

36 MATERIALS SCIENCE↗

DOE OSTI2025

Strength and thermal shock resistance of porous reaction-bonded silicon nitride by direct nitriding of binder jet additively manufactured silicon

The direct nitridation of binder jet additively manufactured silicon to produce porous silicon nitride was explored. The Taguchi Design of Experiments method was used to systematically study the effect of time, temperature, and nitrogen flow rate on the direct nitriding of binder jet additively manufactured silicon to produce porous reaction-bonded silicon nitride (RBSN). Highly porous (61%) samples with high conversion (99%) to silicon nitride were achieved using a thermal profile that utilized two isothermal holds. Further, it was shown that these samples exhibited thermal shock resistance and a low coefficient of thermal expansion. These results indicate that RBSN is readily achievable through additive manufacturing.

Ceramics↗