Influence of Transient Liquid Phase Promoting Additives upon Reactive Plasma Spraying of AlN Coatings and Its Properties
Influence of Transient Liquid Phase Promoting Additives upon Reactive Plasma Spraying of AlN Coatings and Its Properties
复制标题
瞬态液相促进添加剂对反应等离子喷涂AlN涂层及其性能的影响
DOI：
10.1002/adem.201700917
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发表时间：
2018
影响因子：
3.6
通讯作者：
M. Fukumoto
中科院分区：
文献类型：
--
作者：
M. Shahien;M. Yamada;M. Fukumoto
研究了在大气环境下反应等离子喷涂（RPS）AlN涂层时使用瞬时液相促进剂的可行性。通过喷雾干燥制备了几种具有不同组成的可喷雾细AlN-Al 2 O3-Y2 O3混合物。在N2/H2等离子体中进行等离子喷涂，制备了厚且均匀的AlN基涂层（h-AlN、c-AlN、γ-Al 2 O3、Al 5 O 6 N、α-Al 2 O3和YAG）。细颗粒Y2 O3作为瞬态液相促进添加剂，与原料混合物中的Al 2 O3相和AlN颗粒表面的Al 2 O3相反应，在固体AlN颗粒周围形成铝酸钇Y-Al-O润湿剂。然而，由于等离子体的快速凝固速率，很难与AlN晶粒中的散置氧反应。Y2 O3的添加显著降低了涂层的氧化物含量，这是由于初始Al 2 O3的消耗而形成YAG。Y2 O3的影响随AlN原料的增加而显著增加，采用80 AlN-10Al 2 O3 - 10 Y2 O3混合物的反应烧结制备了高AlN含量的小氧化物涂层。随着Y_2O_3的加入和AlN原料量的增加，热导率有所提高。然而，与AlN压块相比，导电性不是那么高，这是由于孔隙率增加、所形成的初始液相状态的不完全烧结、剩余的氧化物含量和涂层的低密度。
The feasibility of using a transient liquid phase promoting agent upon reactive plasma spraying (RPS) of AlN coatings in atmospheric ambient is successfully investigated. Several sprayable fine AlN–Al2O3–Y2O3 mixtures with different compositions are prepared by spray‐drying. Upon plasma spraying in N2/H2 plasma, thick and homogeneous AlN based coatings (h‐AlN, c‐AlN, γ‐Al2O3, Al5O6N, α‐Al2O3, and YAG) are fabricated. Fine Y2O3 acts as transient liquid phase promoting additive, and reacts with Al2O3 phase (from feedstock mixture and on AlN particles surface) to create wetting agent of yttrium aluminate Y–Al–O around solid AlN particles. However, due to rapid solidification rates of plasma, it is difficult to react with the interspersed oxygen in AlN grains. The Y2O3 addition significantly reduces the coatings oxide content due to the consumption of starting Al2O3 to form the YAG. Influence of Y2O3 significantly observes with increasing AlN feedstock and high AlN content coatings with small oxides are fabricated by RPS of 80AlN–10Al2O3–10Y2O3 mixture. Thermal conductivity is improved with using Y2O3 and increasing AlN feedstock. However, the conductivity is not so high compared to the AlN compacts, due to increased porosity, incomplete sintering of the formed initial liquid phase state, remaining oxide content, and low density of the coatings.
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DOI：
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期刊：
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