ti 2 Alnb alloy surface anti-high temperature oxidation composite gradient coating and preparation method thereof
A technology of anti-high temperature oxidation and gradient coating, which is applied in the direction of chemical instruments and methods, metal material coating technology, coating, etc., can solve the problems of poor high temperature oxidation resistance, etc., and achieve strong anti-oxidation ability, uniform and dense structure, high efficiency effect
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Embodiment 1
[0031] 1) Put Ti 2 AlNb-based alloy and Al-Ti alloy targets are put into the arc glow plasma surface alloying device, and Ti 2 The AlNb-based alloy is used as the workpiece electrode, and the Al-Ti alloy target is used as the source electrode. The composition ratio of the Al-Ti alloy target material is: Al accounts for 75wt%, and Ti accounts for 25wt%.
[0032] 2) Evacuate to the ultimate vacuum, feed argon gas, start glow, and debug process parameters are: arc current: 20 A; workpiece bias voltage: 250 V; argon gas pressure: 0.3 Pa; distance between target and workpiece: 200 mm; Duty cycle: 0.2; Holding time: 0.5 h; Working temperature: 840~880℃;
[0033] 3) Stop the glow, cut off the power, and complete the preparation of the Al-Ti infiltrated layer in the middle layer;
[0034] 4) Put the prepared Al-Ti infiltrated layer sample and pure Al alloy target into the arc glow plasma surface alloying device, use the Al-Ti infiltrated layer sample as the workpiece electrode, and...
Embodiment 2
[0041] 1) Put Ti 2 AlNb-based alloy and Al-Ti alloy targets are put into the arc glow plasma surface alloying device, and Ti 2 The AlNb-based alloy is used as the workpiece electrode, and the Al-Ti alloy target is used as the source electrode. The composition ratio of the Al-Ti alloy target material is: Al accounts for 55wt%, and Ti accounts for 45wt%.
[0042] 2) Evacuate to the ultimate vacuum, feed argon gas, start glow, and debug process parameters are: arc current: 30 A; workpiece bias voltage: 350 V; argon gas pressure: 0.5 Pa; distance between target and workpiece: 150 mm; Duty cycle: 0.2; Holding time: 0.5 h; Working temperature: 840~880℃;
[0043] 3) Stop the glow, cut off the power, and complete the preparation of the Al-Ti infiltrated layer in the middle layer;
[0044] 4) Put the prepared Al-Ti infiltrated layer sample and pure Al alloy target into the arc glow plasma surface alloying device, use the Al-Ti infiltrated layer sample as the workpiece electrode, and...
Embodiment 3
[0050] Except following content, all the other are identical with embodiment 1 content:
[0051] Step 1) The composition ratio of the Al-Ti alloy target material is: Al accounts for 45wt%, and Ti accounts for 55wt%.
[0052] The debugging process parameters of step 2) are: arc current: 35A; workpiece bias voltage: 300V; argon gas pressure: 0.4Pa; distance between target and workpiece: 170mm; duty cycle: 0.5; holding time: 1h; working temperature: 840 ~880°C;
[0053] Step 5) Vacuumize to the ultimate vacuum, feed in argon, start the glow, and debug the process parameters as follows: arc current: 35A; workpiece bias: 300 V; argon pressure: 0.4Pa; distance between the target and the workpiece: 170 mm; Duty cycle: 0.2; Holding time: 0.5h; Working temperature: 840~880℃.
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