ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
A sinter-bonding method for a typical structural ceramic, Si3N4, has been studied by making good use of 3Y-ZrO〈sub〉2〈/sub〉/Al〈sub〉2〈/sub〉O〈sub〉3〈/sub〉composites powder as an interlayer. During the process of the sinter-bonding, the sintering of the inserted powder as well as the bonding of the interfaces, Si3N4/ inserted powder /Si〈sub〉3〈/sub〉N〈sub〉4〈/sub〉, progressed imultaneously. Since superplasticity in the 3Y-ZrO〈sub〉2〈/sub〉/AlO〈sub〉3〈/sub〉 composites can arise after, even during, the sintering process under proper bonding temperature and stress conditions, the surface roughness of the Si〈sub〉3〈/sub〉N〈sub〉4〈/sub〉to be bonded can be filled up mainly by the material flow of the interlayer even though the surfaces are uneven and have curvatures. It was found that the sinter-bonding of the polycrystalline Si〈sub〉3〈/sub〉N〈sub〉4〈/sub〉 specimens was completed at temperatures ranging from 1573 to 1813 K with bonding stresses ranging from 4 to 10 MPa, at which superplastic flow of the inserted material wouldarise, whereas the Si〈sub〉3〈/sub〉N〈sub〉4〈/sub〉 showed no permanent deformation. The bonded Si〈sub〉3〈/sub〉N〈sub〉4〈/sub〉 specimens showed the bending strength of more than 300MPa at room temperature
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/08/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.449-452.225.pdf
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