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Porosity-controllable SiCN ceramics were prepared using a simple partial crosslinking method, which is promising for preparing bulk polymer-derived ceramics with different dimensions. Continuous regulation from fully dense to high porosity within polymer-derived SiCN ceramics was realized via secondary crosslinking of partially crosslinked polysilazane (PSN). A fully dense SiCN ceramic was obtained...
Low thermal expansion porous SiC–WC composite ceramics were prepared by solid state reaction of Si and WC at 1560°C, with NH 4 HCO 3 as a pore generating agent. Phase composition, thermal expansion, flexural strength, and microstructure of the carbide ceramics were examined. Presence of the SiC, WC and WC 1−X phases were detected in the carbide ceramics. As Si content increased...
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