Fabrication of AlN/Al2O3 Coatings via Atmospheric Reactive Plasma Nitriding of Al2O3 Powders
Fabrication of AlN/Al2O3 Coatings via Atmospheric Reactive Plasma Nitriding of Al2O3 Powders
复制标题
Al2O3 粉末大气反应等离子体渗氮制备 AlN/Al2O3 涂层
DOI：
10.4028/www.scientific.net/kem.484.166
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
M. Fukumoto
中科院分区：
文献类型：
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作者：
M. Shahien;M. Yamada;T. Yasui;M. Fukumoto
等离子喷涂氧化铝（Al2O3）涂层在延长工程工具的使用寿命方面显示出巨大的效果，但其低导热率限制了其在热交换应用中的应用。氮化铝（AlN）是一种很有前景的提高Al2O3涂层导热性的材料。本文提出了一种通过 Al2O3 粉末反应等离子体氮化制备 AlN/Al2O3 涂层的新方法。通过在大气等离子喷涂工艺 (APS) 中喷涂 Al2O3 粉末可以制备立方 AlN/Al2O3 涂层。等离子体过程中Al2O3粉末在高温N2/H2等离子体中反应生成氧氮化铝，并且很容易氮化生成立方AlN相。因此，Al5O6N 和 c-AlN 相都具有相同的立方对称性（立方且紧密堆积的晶体结构）。然后，颗粒在基材表面碰撞、压平并快速凝固。等离子火焰的高淬火速率阻止了晶体生长和六方AlN相的形成。制备的涂层由 c-AlN、α-Al2O3、Al5O6N 和 γ-Al2O3 组成。由于Al2O3颗粒与周围N2等离子体之间的反应时间增加，AlN含量随着飞行时间（喷雾距离）的增加而提高。可以制造由 97 wt% 组成的 AlN/Al2O3 涂层。喷射距离为 300 mm 时 AlN 相的百分比。
Plasma sprayed alumina (Al2O3) coatings has showed a great effect in service the life of engineering tools, while its low thermal conductivity limits its application in heat exchange applications. Aluminum nitride (AlN) is a promising material to improve the thermal conductivity of Al2O3 coatings. This paper proposed a new way to fabricate AlN/Al2O3 coatings through reactive plasma nitriding of Al2O3 powders. It was possible to fabricate cubic-AlN/Al2O3 coatings by spraying Al2O3 powders in atmospheric plasma spray process (APS). During plasma Al2O3 powder reacted in high temperature N2/H2 plasma to form aluminum oxynitride and it easily nitride to produce the cubic AlN phase. Thus, both of Al5O6N and c-AlN phrases have the same cubic symmetry (cubic and closely packed crystal structure). Then, the particles collide, flatten, and rapidly solidified on substrate surface. The high quenching rate of the plasma flame prevents the crystal growth and formation of hexagonal AlN phase. The fabricated coatings consist of c-AlN, α-Al2O3, Al5O6N and γ-Al2O3. The AlN content was improved with increasing the flight time (spray distance) due to increasing the reaction time between Al2O3 particles and the surrounding N2 plasma. It was possible to fabricate AlN/Al2O3 coating consist of 97 wt. % of AlN phase at the spray distance of 300 mm.
铝粉反应性大气等离子喷涂渗氮制备 A1N 涂层
DOI：
--
发表时间：
2010
期刊：
Materials Transactions 51-55(In press)
影响因子：
--
作者：
Shingo KAWARA;Hiroyuki KOUSAKA;et.al.;M.Shahien
通讯作者：
M.Shahien