ISSN:
1013-9826
Quelle:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Thema:
Maschinenbau
Notizen:
Biomorphic SiC ceramics were fabricated by infiltrating liquid silicon into woodceramicswhich were prepared from beech and pine impregnated with phenolic resin (PR) of different viscosity inorder to reinforce the cell wall of wood. The viscosity of phenolic resin was adjusted by ethanol accordingto the weight ratio of PR to ethanol. The samples not impregnated with resin were compared. Effect ofviscosity of phenolic resin on the dimension shrinkage, weight loss, porosity and the axial and radialflexural strength were investigated. Microstructural observation and phase identification of woodceramicsand biomorphic SiC were performed by SEM and XRD, respectively. The results show that, thelower the viscosity of phenolic resin was, the higher the dimension shrinkage, weight loss and porosity ofwoodceramics were. Biomorphic SiC was a diphase composite consisting of major phase β-SiC andsecondary phase Si. Woodceramics made from pine swelled or broke and strength of woodceramicsfabricated from beech declined when higher viscosity resins were impregnated. The flexural strength ofbiomorphic SiC increased with increasing in viscosity of PR. The axial flexural strength was significantlyhigher than the radial flexural strength because of anisotropic pore microstructures
Materialart:
Digitale Medien
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1878.pdf
