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Effect of the thickness of cold sprayed aluminium alloy coating on the adhesive bond strength with an aluminium alloy substrate

机译：冷喷涂铝合金涂层厚度对与铝合金基材粘接强度的影响

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摘要

The variation of adhesive bond strength of cold sprayed 7075 and 7050 aluminium alloy coatings on 7050-T7351 Al alloy substrate with coating thickness was determined through shear and tensile tests. Generally, without heating the substrate, the shear bond strength decreases with the increase in cold sprayed coating thickness. The thickest 7075 cold sprayed coating produced on rectangular substrates, which were used to measure the shear bond strength, was 1.6 mm. Although thicker coating was produced on the end of the cylindrical substrates, which was used to measure the tensile bond strength in accordance with the ASTM C633 standard, increasing the coating thickness from 1.2 mm to 2.9 mm led to reduction in tensile bond strength from 10 MPa to 5.1 MPa. However, further increasing the coating thickness to 3.7 mm improved the bond strength due to the heating effect resulted from impact of the late stage spray on the pre-formed coating layers. When the rectangular substrates were heated at 175 degrees C during cold spray, not only much thicker coatings were produced, the shear bond strength was also significantly increased. Hence, heating cold sprayed substrate is considered as an effective approach to produce thick and highly bonded coatings. (C) 2015 Elsevier B.V. All rights reserved.
机译：通过剪切和拉伸试验确定了7050-T7351铝合金基板上冷喷涂7075和7050铝合金涂层的粘结强度随涂层厚度的变化。通常，在不加热基材的情况下，剪切粘结强度会随着冷喷涂层厚度的增加而降低。在矩形基材上生产的最厚的7075冷喷涂涂层（用于测量剪切粘结强度）为1.6 mm。尽管在圆柱形基材的端部产生了更厚的涂层，用于根据ASTM C633标准测量拉伸粘合强度，但是将涂层厚度从1.2 mm增加到2.9 mm导致拉伸粘合强度从10 MPa降低至5.1 MPa。但是，将涂层厚度进一步增加至3.7 mm，由于后期喷涂对预成型涂层的影响而产生的热效应，从而提高了粘合强度。在冷喷涂过程中将矩形基板加热到175摄氏度时，不仅生成了很多厚的涂层，而且剪切粘结强度也显着提高。因此，加热冷喷涂基材被认为是生产厚且高粘结性涂层的有效方法。 （C）2015 Elsevier B.V.保留所有权利。

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