Grain size effect of pre‐ and post‐coating treated cemented carbides on PVD films' adhesion and mechanical properties
Grain size effect of pre‐ and post‐coating treated cemented carbides on PVD films' adhesion and mechanical properties
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DOI：
10.1002/mawe.201300178
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发表时间：
2013-08
影响因子：
1.1
通讯作者：
K. Bouzakis;N. Michailidis;G. Skordaris;A. Tsouknidas;S. Makrimallakis;E. Bouzakis
中科院分区：
文献类型：
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作者：
K. Bouzakis;N. Michailidis;G. Skordaris;A. Tsouknidas;S. Makrimallakis;E. Bouzakis
涂层硬质合金刀具的晶粒尺寸可能通过影响涂层与基体的附着力或沉积过程中涂层的生长而显著影响刀具寿命。在本研究中，用两种不同的PVD膜包覆三种不同晶粒的硬质合金。采用了不同的前后处理方法，并通过纳米压痕和倾斜冲击试验来评估其对薄膜力学性能和附着力的影响。总体而言，沉积在超细颗粒基底上的涂层表现出最高的力学性能。研究表明，与普通和超细颗粒基材相比，细颗粒基材的粘合性能有所提高。微喷丸可以进一步提高普通和细晶基材的薄膜附着力。在所有的基材情况下，涂层的后处理都是有益的，因为涂层表面的涂刷去除了液滴，同时在涂层上产生了表面残余应力，导致硬度增加。
The grain size of coated cemented carbide tools may significantly affect the tool life by influencing either the coating adhesion to the substrate or the coating growth during deposition. In the present study three variously grained cemented carbides were coated with two different PVD films. Various pre‐ and post‐treatments were applied, while their effect on the films' mechanical properties and adhesion was assessed by nanoindentations and inclined impact tests. The coatings deposited on ultra‐fine‐grained substrates exhibited the highest mechanical properties overall. The research revealed elevated adhesive properties for the fine‐grained substrate compared to the normal and ultra‐fine‐grained one. The film adhesion of normal and fine‐grained substrate can be further enhanced through micro‐blasting. Post‐treatments of the coatings were beneficial in all substrate cases, as brushing of the film surface removed droplets while at the same time inducing surface residual stresses at the coating resulting in a hardness increase.