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Evaluation of Bonding Strength on Coating Layers

Hu Naisai;Xu Kewei;He Jiawen  
Bonding strength is an important criterion in evaluating the quality of the coating layers. The conventional way of bonding strength testing for thick layers is pull-off method, and scratch test for thin films. The drawbacks of these two methods are discussed in thls paper. A high load indenter with loading and unloading curves plotting attachment has been developed by the authors. Using cleavage indenting, the bonding strength of thermal sprayed layers can be tested and is particularly good for those with the bonding strength higher than that of adhesives. When normal indenting is applied, the thin film bonding can be tested by this indenter and the results have been compared with that by scratch tests. A proper way to evaluate the bonding strength of thin films is contact rolling test, in which the cyclic shear stress range is responsible to the delandnation of the thin films and can be employed for the criterion of the adhesion. The testing condition of this method is close to the practical applications,its failure form is interfacial debonding, regardless the non-interfacial properties. Therefore it is appropriate to use this method for bonding testing of thin films.
【Fund】: 国家自然科学基金!59671084
【CateGory Index】: TQ15
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