Thermal Stability and Oxidation Resistance of Nanocomposite TiC/a-C Protective Coatings
Thermal Stability and Oxidation Resistance of Nanocomposite TiC/a-C Protective Coatings
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纳米复合TiC/a-C防护涂层的热稳定性和抗氧化性
DOI：
10.1002/ppap.200931002
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发表时间：
2009
影响因子：
3.5
通讯作者：
J. C. Sánchez
中科院分区：
文献类型：
--
作者：
D. Martinez;C. López;R. Gago;Asunción Fernández;J. C. Sánchez
在非晶润滑剂基体中嵌套硬相小晶组成的纳米复合膜作为保护涂层得到了广泛的研究。这些类型的涂层通常在极端环境中工作，暴露在高温（800-900摄氏度以上）和/或氧化/腐蚀性大气中，这可能会抵抗。因此，研究这种涂层在高温（热稳定性）和氧气存在下的行为（抗氧化性）是很重要的。在这个意义上，我们选择了具有良好机械和摩擦学性能的TiC/a- c纳米复合涂层，以便在三种不同的环境下进行多次热测试：高真空（10(-6)mbar），低真空（10(-1)mbar）和空气。我们的观察使我们能够确定薄膜的微观结构在高真空中至少高达1000摄氏度是稳定的。当有氧气存在时，由于Ti氧化物的形成和C的去除，实际使用温度降低到700℃（低分压）和300℃（空气）。
Nanocomposite films composed by small crystallites of hard phases embedded in an amorphous lubricant matrix have been extensively studied as protective coatings. These kinds of coatings have often to work in extreme environments, exposed to high temperatures (above 800-900 degrees C), and/or oxidizing/corrosive atmospheres, which may resist. As a result, it is important to study the behavior of such coatings at high temperatures (thermal stability) and in the presence of oxygen (oxidation resistance). In this sense, we have selected a TiC/a-C nanocomposite coating with good mechanical and tribological properties in order to do several thermal tests under three different environments: high vacuum (10(-6) mbar), low vacuum (10(-1) mbar), and air. Our observations allow us to establish that the film microstructure is stable at least up to 1000 degrees C in high vacuum. When oxygen is present, the practical temperature of use is reduced at 700 degrees C (low partial pressure) and 300 degrees C (air) by formation of Ti oxides and C removal.