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High temperature wettability and oxidation behavior of TiN, Ti–Al–N and Ti–Si–N PVD film
Materials Research Express ( IF 2.3 ) Pub Date : 2020-11-05 , DOI: 10.1088/2053-1591/abc3f4
Lili Duan 1, 2 , Hua Wu 1 , Wencui Xiu 1 , Xiaofeng Yu 1 , Liming Guo 1
Affiliation  

In aluminium cutting and die casting, tools are exposed to Built UP Edge (BUE) and Built Up Layer (BUL) and erosion due to the frequent contact of the tool surface to the aluminum alloy, to oxidation due to high temperatures. For this reason, the susceptibility to reaction with liquid aluminum and stability of TiN, Ti–Al–N and Ti–Si–N films were investigated using wetting test, high temperature oxidation experiment and complementary differential scanning calorimetry. The results show that the type of chemical bond affects the surface tension, tool steel with metal bonds is most easily wetted, after being wetted and cooled by molten Al at 725 C, the contact angle is approximately 0. Because the maximum temperature of the experiment has reached the decomposition temperature of TiN film, therefore, the contact angle of TiN film with ionic bond is 35.3, slightly larger than tool steel. However, there are complex ionic bond compounds Ti3AlN and covalent bond compounds Si3N4 in Ti–Al–N and Ti–Si–N films, which significantly reduce the wettability of the film with molten aluminum. The contact angles are 78 and 71, respectively. During the oxidation process, due to Ti–Al–N and Ti–Si–N films contain Al and Si elements, the phase and morphology did not change until 800 C, this indicates that the effects of different chemical bonds caused by alloying elements on oxidation resistance and wetting resistance have a similar relationship.



中文翻译:

TiN,Ti–Al–N和Ti–Si–N PVD膜的高温润湿性和氧化行为

在铝切割和压铸中,由于工具表面与铝合金的频繁接触,工具会暴露于Building UP Edge(BUE)和Building Up Layer(BUL)中并遭受腐蚀,并且会因高温而氧化。因此,使用润湿测试,高温氧化实验和互补差示扫描量热法研究了与液态铝反应的敏感性以及TiN,Ti–Al–N和Ti–Si–N薄膜的稳定性。结果表明,化学键的类型会影响表面张力,带有金属键的工具钢最容易润湿,在725 C下被熔融的Al润湿并冷却后,接触角约为0。因为实验的最高温度TiN膜已经达到TiN膜的分解温度,因此,其与离子键的接触角为35。3,比工具钢稍大。但是,有复杂的离子键化合物Ti3 AlN和共价键化合物Si3N4在Ti–Al–N和Ti–Si–N薄膜中,这大大降低了薄膜与熔融铝的润湿性。接触角分别为78和71。在氧化过程中,由于Ti–Al–N和Ti–Si–N膜包含Al和Si元素,相和形态直到800 C才发生变化,这表明合金元素对金属的不同化学键的影响抗氧化性和抗湿性具有相似的关系。

更新日期:2020-11-05
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