Intrinsic nitridation kinetics of high‐purity silicon powder

Compatibility/Stability Issues in the Use of Nitride Kernels in LWR TRISO Fuel

“…For purposes of assessing the issue of nitriding SiC in a TRISO particle the use of relations for nitriding silicon would be a conservative assumption as elemental silicon would be more reactive. Maalmi and Varma [5] obtained an intrinsic kinetics expression for nitriding silicon powder. They determined a relation, Eq.…”

“…1. [5] Equation 1 was used with a set of very conservative assumptions to determine the possible nitriding rate in the SiC layer in a TRISO particle with a UN kernel. Whereas Eq.…”

Nitridation enhancement of TiSi2 powders by addition of nickel

“…Understanding of the silicon nitridation process has evolved significantly over the past decades, and the effects of many of the reaction variables on the reaction kinetics and product morphology are well documented [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. In addition to monolithic ceramics, some works have also focused on using reaction-bonded silicon nitride as a composite matrix [19,20].…”

Isothermal nitridation kinetics of TiSi2 powders

“…One of the attractive methods for the synthesis of Si 3 N 4 ceramics is the nitridation of silicon powder compacts but this requires high temperatures treatments and induces a relative low volume increase of only 21.6%. The effects of the main controlling factors on the nitridation of silicon powders were examined in several previous studies: temperature [8][9][10], particle shape and size [8], impurities in the sample and in the atmosphere [11][12][13], composition of the atmosphere [14,15]. On this way, synthesis of silicon nitride and titanium nitride phases by direct nitridation of a TiSi 2 powder has the advantage to generate of more economical generation a ceramic.…”