Increases in the strength of Si-additive mixture granules by presintering

Porous Sintered Reaction‐Bonded Silicon Nitrides with Dual‐Sized Pore Channel using Presintered Si‐Additive Mixture Granules

“…They are classified according to the mean granule size. 13 Moreover, the plane contact between the granules prevails over the point contact owing to the deformation of the granules caused by the shaping pressure. 1, the numbers following the character "m" represents the mean granule size in micrometers, while "as-SD" stands for the nonclassified granule.…”

“…Granules were fabricated by spray drying, the detailed procedure of which is available in the literature. 13 The presintering of the granules was conducted using a tube furnace soaking at 1200°C for 10 min under a flowing Ar atmosphere. The green compact was shaped into a disk (diameter~30 mm, t~3 mm) by means of uniaxial pressing at 3.7 MPa.…”

“…Given that narrow pore channels produce a large pressure drop across current SRBSN filters, the widening of their pore channels to the size of those in commercial filters (d p ! 13 In this research, green bodies for subsequent nitriding and postsintering were prepared through the uniaxial pressing of strengthened presintered granules. Recently, the authors suggested a new concept to enhance both the filtering efficiency and the permeability of SRBSN filters via granulation of the starting powders.…”

“…Recently, the authors suggested a new concept to enhance both the filtering efficiency and the permeability of SRBSN filters via granulation of the starting powders. 13,14 Our investigation into microstructural control This research project was supported by the Korea Institute of Materials Science, a subsidiary branch of the Korea Institute of Machinery and Materials. *yjpark87@kims.re.kr © 2012 The American Ceramic Society was aimed at forming wide pore channels (d p !…”

“…The authors have demonstrated that the granule strength can be enhanced by a presintering treatment facilitated above the eutectic point of the sintering additive system. 13 In this research, green bodies for subsequent nitriding and postsintering were prepared through the uniaxial pressing of strengthened presintered granules. Emphasis was laid on the relationship between the microstructure and the properties affected by the postsintering temperature and granule size.…”