@article {Hong:2010:1533-4880:6672,
title = "Fabrication of Microcellular SiCN Ceramics from Templated Polyvinylsilazane with Expandable Microspheres",
journal = "Journal of Nanoscience and Nanotechnology",
parent_itemid = "infobike://asp/jnn",
publishercode ="asp",
year = "2010",
volume = "10",
number = "10",
publication date ="2010-10-01T00:00:00",
pages = "6672-6676",
itemtype = "ARTICLE",
issn = "1533-4880",
eissn = "1533-4899",
url = "https://www.ingentaconnect.com/content/asp/jnn/2010/00000010/00000010/art00060",
doi = "doi:10.1166/jnn.2010.2506",
keyword = "FOAM, MICROCELLULAR, EXPANDABLE TEMPLATE, PRECERAMIC POLYMER, SICN CERAMIC",
author = "Hong, Lan-Young and Ryu, So-Hyoung and Kim, Dong-Pyo",
abstract = "The microcellular SiCN ceramics with high porosity and high surface area were fabricated from polysilazane as a viscous SiCN ceramic precursor and expandable microspheres as a self-sacrificial template. The fabrication steps were composed of (1) forming of expandable microsphere compact,
(2) infiltrating polysilazane into the compact, (3) foaming and curing, (4) pyrolysis in N2 gas. The microcellular structures and properties of the obtained ceramic products depended on the foaming and curing conditions as well as the pyrolysis temperature. When foamed and cured
at 120 \textdegreeC for 30 min, then pyrolyzed at 1000 \textdegreeC in N2, the microcellular product exhibited the largest cell size 9.3 m with the lowest cell densities 2.2\texttimes108 cells/cm2, 93% of porosity and surface area of 356 m2/g. Furthermore,
the higher temperature pyrolysis at 1300 \textdegreeC induced significant change in the microcellular morphology by reducing the cell size with thicker wall and the cell density. Finally, it demonstrated an efficient way of manufacturing highly porous microcellular ceramics with no etching process
using a polyvinylsilazane and expandable microspheres for catalytic supporting application.",
}