Oxidation behavior of molybdenum nitride coatings
Oxidation behavior of molybdenum nitride coatings
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DOI：
10.1016/s0257-8972(03)00702-3
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发表时间：
2003-09
影响因子：
5.4
通讯作者：
N. Solak;F. Ustel;M. Ürgen;S. Aydin;A. Çakir
中科院分区：
文献类型：
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作者：
N. Solak;F. Ustel;M. Ürgen;S. Aydin;A. Çakir
采用电弧PVD法在H13热作工具钢和氧化铝基体上制备了氮化钼涂层。涂层的特征在于其机械和结构性能。采用TG/DTA研究了涂层在氧化铝基体上的氧化行为。将涂覆的H13基材在管式炉中在大气条件下在由氧化铝基材上的相同涂层的TG/DTA测试确定的特定温度下氧化。采用扫描电子显微镜和X射线衍射对氧化膜形貌进行了表征。Mo-N涂层的抗氧化性差，因为其氧化物的非保护性性质和氧化物在适度高温下的挥发性。氧化过程中形成的氧化物被确定为MoO 2和MoO 3。氧化反应产物MoO 3是挥发性氧化物，其蒸发反应在550 °C后开始。此外，Mo 2N的分解开始于681 °C，分解反应产物是金属钼，其也氧化成挥发性MoO 3。
Molybdenum nitride coatings were deposited onto H13 hot working tool steel and alumina substrates by arc PVD. The coatings were characterized with respect to their mechanical and structural properties. Oxidation behavior of the coatings on alumina substrates was investigated by TG/DTA. Coated H13 substrates were oxidized in a tube furnace under atmospheric conditions at specific temperatures determined from TG/DTA tests of the same coating on alumina substrate. The oxide scale morphology was characterized by scanning electron microscopy and X-ray diffraction. Resistance to oxidation of Mo–N coatings is poor because of the non-protective nature of their oxides and the volatility of the oxides at moderately high temperatures. The oxides formed during the oxidation were determined as MoO2and MoO3. The oxidation reaction product MoO3is a volatile oxide and its evaporation reaction starts at after 550 °C. In addition, decomposition of Mo2N starts at 681 °C and the decomposition reaction product is metallic molybdenum, which also oxidizes to volatile MoO3.