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Effects of heat treatment on the properties of powder injection molded AlN ceramics
Institute of Powder Metallurgy, Materials Science Department, University of Science and Technology Beijing.
Institute of Powder Metallurgy, Materials Science Department, University of Science and Technology Beijing.
Institute of Powder Metallurgy, Materials Science Department, University of Science and Technology Beijing.ORCID iD: 0000-0003-4888-6237
Institute of Powder Metallurgy, Materials Science Department, University of Science and Technology Beijing.
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2008 (English)In: Xiyou jinshu, ISSN 1001-0521, E-ISSN 1867-7185, Vol. 27, no 1, p. 70-73Article in journal (Refereed) Published
Abstract [en]

The effects of two different heat-treatment atmospheres, nitrogen atmosphere and reducing nitrogen atmosphere with carbon, on the properties of Y2O3-doped aluminum nitride (AlN) ceramics were investigated. The AlN powder as a raw material was synthesized by self-propagating high-temperature synthesis (SHS) and compacts were fabricated by employing powder injection molding technique. The polymer-wax binder consisted of 60 wt.% paraffin wax (PW), 35 wt.% polypropylene (PP), and 5 wt.% stearic acid (SA). After the removal of binder, specimens were sintered at 1850°C in nitrogen atmosphere under atmospheric pressure. To improve the thermal conductivity, sintered samples were reheated. The result reveals that the heat-treatment atmosphere has significant effect on the properties and secondary phase of AlN ceramics. The thermal conductivity and density of AlN ceramics reheated in nitrogen gas are 180 W·m−1·K−1 and 3.28 g·cm−3 and the secondary phase is yttrium aluminate. For the sample reheated in reducing nitrogen atmosphere with carbon, the thermal conductivity and density are 173 W·m−1·K−1 and 3.23 g·cm−3, respectively, and the secondary phase is YN.

Place, publisher, year, edition, pages
2008. Vol. 27, no 1, p. 70-73
National Category
Other Materials Engineering
Research subject
Engineering Materials
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URN: urn:nbn:se:ltu:diva-3251DOI: 10.1016/S1001-0521(08)60033-9Local ID: 10ee0f6b-9913-4615-84ae-e918281bd1f0OAI: oai:DiVA.org:ltu-3251DiVA, id: diva2:976107
Note
Upprättat; 2008; 20150416 (farakh)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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