A kind of anti-high temperature hot corrosion composite coating and preparation method thereof
A composite coating, warm technology, applied in the direction of coating, surface reaction electrolytic coating, metal material coating process, etc., to achieve the effect of prolonging service life, good thermal corrosion resistance and strong controllability
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Embodiment 1
[0029] A method for preparing a high-temperature hot-corrosion resistant composite coating on the surface of a niobium alloy, comprising the following steps:
[0030] 1. Pretreatment: The base material is niobium alloy C103, its chemical composition is: Hf 10.0, Ti 1.30, Zr 0.34, W0.34, Ta 0.30, C 0.005, N 0.014, O 0.013, Nb balance (wt.%) , polished step by step, ultrasonically cleaned with acetone for 10 minutes, and dried;
[0031] 2. Embedding aluminizing treatment: first, the aluminizing agent is prepared according to the following weight percentage: Al 2 o 3 Al powder 87wt%, Al powder 10wt%, NaF powder 3wt%, then use a ball mill to mix, then seal the well-mixed aluminizing agent and substrate together in a ceramic crucible, and finally place it in a vacuum tube furnace and evacuate to 0.15 ×10 -2 Pa, raised to 940°C at a heating rate of 10°C / min, and held for 4 hours, then the furnace was cooled to room temperature to obtain NbAl 3 Aluminized niobium alloy substrate ...
Embodiment 2
[0034] 1. Pretreatment: The base material is niobium alloy C103, its chemical composition is: Hf 10.0, Ti 1.30, Zr 0.34, W0.34, Ta 0.30, C 0.005, N 0.014, O 0.013, Nb balance (wt.%) , polished step by step, ultrasonically cleaned with acetone for 10 minutes, and dried;
[0035] 2. Embedding aluminizing treatment: first, the aluminizing agent is prepared according to the following weight percentage: Al 2 o 3 84wt% Al powder, 12wt% Al powder, 4wt% NaF powder, then use a ball mill to mix evenly, then seal the well-mixed aluminizing agent and substrate together in a ceramic crucible, and finally place it in a vacuum tube furnace and evacuate to 0.75 ×10 -2Pa, raised to 900°C at a heating rate of 10°C / min, and kept at this temperature for 4 hours, then the furnace was cooled to room temperature to obtain NbAl 3 Aluminized niobium alloy substrate for aluminized layer;
[0036] 3. Micro-arc oxidation treatment: double pulse high-voltage power supply is selected as the pressure so...
Embodiment 3
[0038] 1. Pretreatment: The base material is niobium alloy C103, its chemical composition is: Hf 10.0, Ti 1.30, Zr 0.34, W0.34, Ta 0.30, C 0.005, N 0.014, O 0.013, Nb balance (wt.%) , polished step by step, ultrasonically cleaned with acetone for 10 minutes, and dried;
[0039] 2. Embedding aluminizing treatment: First, the aluminizing agent is prepared according to the following weight percentage: Al 2 o 3 Al powder 90wt%, Al powder 8wt%, NaF powder 2wt%, then use a ball mill to mix, then seal the well-mixed aluminizing agent and substrate together in a ceramic crucible, and finally place it in a vacuum tube furnace and evacuate to 3 ×10 -2 Pa, at a heating rate of 10°C / min to a furnace temperature of 940°C for 3 hours, and then the furnace was cooled to room temperature to obtain NbAl 3 Aluminized niobium alloy substrate for aluminized layer;
[0040] 3. Micro-arc oxidation treatment: double pulse high-voltage power supply is selected as the pressure source, the aluminiz...
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