Evaluation of Delamination Strength of Thermally Sprayed Coating by Edge-Indentation Method.
Evaluation of Delamination Strength of Thermally Sprayed Coating by Edge-Indentation Method.
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用边缘压痕法评价热喷涂涂层的分层强度。
DOI：
10.2472/jsms.47.413
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
K. Tasaka
中科院分区：
文献类型：
--
作者：
K. Nakasa;Masahiko Kato;Dongkun Zhang;K. Tasaka
为了评价热喷涂涂层的剪切剥离强度，提出了一种新的“边缘压痕法”，并将该方法应用于高速火焰喷涂工具钢(JIS：SKD5)上的WC-Co涂层和低碳钢(JIS：SS400)上的Al_2O_3-TiO_2涂层。根据压痕载荷P-位移δ曲线，定义了涂层的分层能ED：ED=∫δ00P·dδ-∫δ0-B10P‘·dδ/S×2θ/2π其中δ0为分层位移，B1为涂层厚度，S为分层区域，2θ为分层角，P’为压痕载荷。由实验得到的WC-Co涂层的分层能ED与涂层厚度B1和与边缘的相对压痕距离x/B1几乎相同。Al_2O_3-TiO_2涂层的ED随B_1含量的增加略有增加，且小于WC-Co涂层。边缘压痕法是评价材料剪切剥离强度的有效方法，特别是当基材非常坚硬时。
In order to evaluate the shear-delamination strength of thermally sprayed coatings, an “edge-indentation method” was newly proposed in the present study, and the method was applied to WC-Co coating deposited on a tool steel (JIS: SKD5) specimen by high-velocity flame spraying and Al2O3-TiO2 coating on a mild steel (JIS: SS400) specimen by plasma spraying. The delamination energy of coating, Ed, is defined by the following equation based on the indentation load P vs. displacement δ curve:Ed=∫δ00P·dδ-∫δ0-B10P'·dδ/S×2θ/2πWhere δ0 is the displacement at delamination, B1 is the coating thickness, S is the delamination area, 2θ is the delamination angle and P' is the indentation load only for substrate. The delamination energy Ed of WC-Co coating obtained by experiment reveals almost the same value irrespective of coating thickness B1 and relative indentation distance from edge x/B1. The Ed of Al2O3-TiO2 coating increases slightly with an increase in B1, and the Ed is smaller than that of WC-Co coating. The edge-indentation method is effective to evaluate the shear-delamination strength especially when the substrate is very hard.