ISSN:
1662-9779
Quelle:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Thema:
Physik
Notizen:
The Si3N4/SiC and Si3N4/SiC/TiO2 composite ceramics were sintered at 1850 ℃, for 2 h, inair by Hot-Press. A semi-elliptical surface crack was made at the center of the tensile surface of thetest specimen using a Vickers indenter at a load of 24.5 N. By this method, the crack length on surfacewas made the semi-elliptical cracks of about 100 ㎛. Crack-healing behavior depends on healingtemperature. The optimum healing condition of Si3N4/SiC and Si3N4/SiC/TiO2 composite ceramicsare well known for 1,300 ℃, 1h in air environment. So Smooth and as-cracked specimens wereheated in this condition. To investigate temperature-dependence of the SiO2 gel coated specimen,four kinds of temperatures (800, 900, 1000, 1,300 ℃) were tested. And to investigate SiO2 gel coatingtime-dependent, one and three times were coated. SiO2 gel coated specimens indicated increase ofbending strength as the temperature goes up. Moreover the bending strength of SiO2 gel coatingspecimens was similar to the bending strength of healed smooth specimen at 900 ℃
Materialart:
Digitale Medien
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.124-126.719.pdf
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