Explosive painting process of preparing heat barrier coating
A technology of explosive spraying and thermal barrier coating, which is used in coatings, metal material coating processes, devices for coating liquids on surfaces, etc. problem, to achieve the effect of low cost, high deposition rate and good bonding
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Embodiment 1
[0014] The base material is superalloy M38G, and the sample size is 15×25×5mm 3 . Before spraying, the samples were cleaned and sandblasted (Al 2 o 3 , 28 mesh). Using a two-dimensional workbench, six-sided explosive spraying was carried out on the sample. The prepared thermal barrier coating consists of two parts: an anti-oxidation connection layer and an insulating ceramic layer as a surface layer. The connection layer is made of Ni-25Cr-5Al-0.5Y, ZrO 2 -8Y 2 o 3 For the ceramic layer material, the temperature of the substrate is controlled to be less than 150°C. This embodiment is a thermal barrier coating with a double-layer structure. The technical parameters of the explosive spraying are shown in Table 1, and the composition and thickness parameters are shown in Table 2.
[0015] Table 1 embodiment 1 detonation spraying process parameter
[0016] Process parameters Ni-25Cr-5Al-0.5Y ZrO 2 -8Y 2 o 3
[0017] Working frequency 4shots / s 4shots / s
...
Embodiment 2
[0029] Substrate composition and size are the same as embodiment 1. First, clean and sandblast the sample, and then prepare a thermal barrier coating with a gradient structure. In this example, the MCrAlY alloy system of the connection layer uses Ni-25Cr-5Al-0.5Y, and the insulating ceramic layer is ZrO 2 -8Y 2 o 3 Material, a transition layer is added between the connection layer and the ceramic layer, the transition layer is composed of two components of the connection layer and the ceramic layer, specifically: the first transition layer adopts 75% Ni-25Cr-5Al-0.5Y by weight percentage Tie layer and 25% zirconia ceramic layer ZrO 2 -8Y 2 o 3 , the second transition layer adopts 50% Ni-25Cr-5Al-0.5Y connection layer and 50% zirconia ceramic layer ZrO by weight percentage 2 -8Y 2 o 3 , the third transition layer adopts 25% Ni-25Cr-5Al-0.5Y connection layer and 75% zirconia ceramic layer ZrO by weight percentage 2 -8Y 2 o 3 , obtain a thermal barrier coating with a gr...
Embodiment 3
[0047] The base material is Ni 3 Al-based alloy IC-6, the sample size is 15×25×2mm 3 . Before spraying, the samples were cleaned and sandblasted (Al 2 o 3 , 28 mesh). A thermal barrier coating with a double-layer structure is prepared. The connecting layer adopts the Co-29Cr-6Al-1Y alloy system. In order to improve the thermal insulation effect of the coating, the ceramic layer ZrO 2 -8Y 2 o 3 The thickness is 900 μm. Control the substrate temperature to less than 200°C. The prepared thick ceramic layer has no peeling phenomenon, and there are regular longitudinally distributed microcracks in the ceramic layer, which is beneficial to improve the thermal shock resistance of TBCs. The parameters of the explosive spraying process are shown in Table 5, and the composition and thickness parameters are shown in Table 6.
[0048] Table 5 embodiment 3 explosive spraying process parameters
[0049] Process parameters Co-29Cr-6Al-1Y ZrO 2 -8Y 2 o 3
[0050]...
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