Evaluation of toughness of hard coatings
Evaluation of toughness of hard coatings
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DOI：
10.1179/174329406x85056
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发表时间：
2006-02
影响因子：
2.8
通讯作者：
M. Bao;X. D. Zhu;Jiawen He
中科院分区：
文献类型：
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作者：
M. Bao;X. D. Zhu;Jiawen He
采用多次冲击来评价硬质涂层的抗冲击磨损性能、结合强度、疲劳性能等，其载荷与冲击次数的关系与疲劳曲线相似，更接近涂层零件的实际应用。在淬火钢基材上进行了铬铜氮涂层，并在涂层基材体系上进行了多次冲击试验。在低冲击载荷下，涂层的固有强度和涂层与基材之间的结合强度相互竞争。涂层可能发生开裂或剥落，其强度与高周疲劳强度一样起着重要作用。随着载荷的增加，涂层向低周疲劳方向发展，涂层的韧性占优势。高载荷区的粘结破坏主要取决于涂层的韧性，失效循环次数可作为韧性判据。
Repeated impact has been introduced to evaluate different properties of hard coatings, such as impact wear resistance, bonding strength, fatigue, etc. The load and impact number relationships are similar to that of fatigue curves, and close to some real applications of coated parts. Cr–Cu–N coatings were performed on a hardened steel substrate and the repeated impact tests were conducted on the coating substrate system. At a low impact load, the intrinsic strength of the coating layer and the bonding strength between the coating and substrate are in competition. Coating layer cracking or delamination might occur and the strength plays an important role like that of high cycle fatigue. When the load is increased and towards the low cycle fatigue regime, toughness of the coating layer turns out to be predominant. The cohesive failure in high load regime preferentially depends on the toughness of the coating layer, and the failure cycles can be employed as a toughness criterion.