ISSN:
1013-9826
Quelle:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Thema:
Maschinenbau
Notizen:
ZrB2-SiC composite is a promising candidate for ultra-high temperature ceramics, which isdifficult to be sintered due to strong covalent bonding of ZrB2 and SiC. ZrB2-30Vol.%SiC composite wasprepared by spark plasma sintering technique (SPS) at the sintering temperature of 1850°C, sinteringpressure of 50MPa, heating rate of 200°C/min and holding time of 3 minutes. The phase components andmicrostructure were examined by X-ray diffraction, scanning electron microscopy and transmittingelectron microscopy. The results show that the product is composed of ZrB2 phase, SiC phase and ZrO2phase. A rationalization for the presence of ZrO2 phase is based on the impurity of raw material andoxidation of ZrB2 during SPS. The consolidated product is very dense and no apparent pores exist in themicrostructure. ZrO2 phase with irregular shape is found among some particles as a binder phase. It isshown that the presence of ZrO2 phase may be beneficial to the densification of ZrB2-SiC composite
Materialart:
Digitale Medien
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.1743.pdf
