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:
Polycrystalline SiC-diamond composites have been fabricated by high pressure and hightemperature, HPHT, sintering using a Si infiltration method. However, infiltration of liquid siliconaround the diamond particles results not only in SiC but also in free silicon, which causesdeterioration of the composite properties. In this work, a novel sintering procedure was developedto avoid the formation of free silicon in the composite structure. A disc composed of a mixture ofgraphite and silicon was first press-molded at room temperature. The disc was then placed abovethe diamond powder inside a high pressure chamber used for the HPHT sintering process. Thisarrangement permitted to preferentially form liquid Si in a C solution, which infiltrates in betweenthe diamond particles. Using this procedure, free silicon formation is inhibited and the SiC-diamondcomposite forms a rigid structure with improved properties
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.591-593.654.pdf
