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:
Liquid-phase sintering of aluminum nitride (AlN) with additives was reviewed. The mostimportant innovation was the discovery of critical sintering aids for AlN densification, specificallyrare-earth compounds and alkali-earth compounds. These additives are extremely valuable forincreasing thermal conductivity by trapping and removing oxygen in the AlN lattice during firing.Consequently, thermal conductivities in AlN ceramics of 100 to 260W/mK were developed. We alsostudied the effects of parameters such as raw powder, additives, composition, and firing condition inliquid-phase sintering with AlN-sintering aids, focusing on oxygen impurities in the system. Thesintering behavior of powder compacts was investigated by evaluating the densification, the latticeconstant c for AlN, and the dihedral angle of the interface between the AlN grains and the grainboundary liquid-phase. In our results, the change in densification was closely related to changes inthe lattice constant c and the dihedral angle. That is, the sintered density increased with an increasein the oxygen dissolved in the AlN grains and with the improvement in wettability between thesolid and liquid phase
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.554.181.pdf
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