Method for preparing ceramic coating by pressurizing and microwave-sintering
A technology of ceramic coating and microwave sintering, which is applied in the direction of coating, metal material coating process, electrolytic coating, etc., can solve the problems of limited temperature and non-dense coating, and achieve fast sintering speed, low preparation temperature, and coating The effect of high density
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Embodiment 1
[0024] Example 1: ZrO 2 -Al 2 o 3 nano-micro lamination
[0025] Prepare 0.1mol / L Zr(NO 3 ) 4 +8wt.%Y(NO 3 ) 3 and 0.1mol / L Al(NO 3 ) 3 Electrodeposition solution, and then use graphite plate as anode and 1Cr13 stainless steel sample as cathode to carry out constant voltage electrolytic deposition of samples alternately in two electrodeposition solutions, the deposition voltage is 10-20V, and the deposition time of each layer is 30-90s. After each layer is deposited, the sample is dried at 150°C for 30 minutes, and the next layer is deposited after cooling, ZrO 2 -Al 2 o 3 The number of stacked layers is determined as required. Embed the sample deposited with micro-laminates into the wave-absorbing graphite powder, apply a pressure of about 3MPa, place it in a pressurized microwave sintering device, heat it to 1300°C with microwaves, sinter for 10min, and then cool to room temperature. In 1Cr13 stainless steel samples Obtain uniform and dense ZrO on the surface 2 ...
Embodiment 2
[0026] Embodiment 2: Nano Al 2 o 3 Coating nano / micro YSZ composite ceramic coating
[0027] Prepare 0.1mol / LAl(NO 3 ) 3 +1wt.%Y(NO 3 ) 3 Add ammonia water dropwise to the solution and stir vigorously until the pH value of the solution is approximately equal to 10, filter the precipitate and disperse it in the ethanol solution, stir with a magnetic stirrer for 2 hours, and add an appropriate amount of 2mol / L lemon Al 2 o 3 -Y 2 o 3 colloidal solution. Then add 5wt.% Al in this colloidal solution 2 o 3 Nano powder and 95wt.% YSZ nano / micro powder, the mass ratio of nano and micro powder is set at 7:3, and the mixed slurry is ball milled for 4 to 6 hours with a high-energy ball mill to obtain Al 2 o 3 -Y 2 o 3 Mixed electrophoretic slurry of sol-gel + YSZ micropowder. Conduct electrophoretic deposition at a constant voltage of 10V at 50°C in a water bath for 5 to 10 minutes, and dry at a constant temperature of 90°C for 60 minutes. After drying, embed the sample ...
Embodiment 3
[0028] Example 3: ZrO 2 -Y 2 o 3 Nano-micron composite ceramic coating
[0029] Prepare 0.1mol / L Zr(NO 3 ) 4 +8wt.%Y(NO 3 ) 3 Aqueous solution, then add ammonia water dropwise to the solution and stir vigorously until the pH value of the solution is approximately equal to 10, and continue to stir with a magnetic stirrer for 2h to obtain ZrO 2 -Y 2 o 3 colloidal solution. Thereafter, add 3% polyvinyl alcohol to the colloidal solution, heat it in a water bath at 80° C. for 1 h to fully dissolve it, and then add 50% ZrO to the colloidal solution. 2 -6%Y 2 o 3 Nano powder and micron powder, 70% of which is nano powder, 30% is micron powder, the particle diameter is 10μm, and the mixed liquid is ball milled for 4-6h with a high-energy ball mill to obtain ZrO 2 -Y 2 o 3 Sol-gel+ZrO 2 -6%Y 2 o 3 powder slurry. Coat the slurry on the surface of the MCrAlY alloy coating, dry it at a low temperature of 60°C for 30 minutes, embed it in the absorbing graphite powder, app...
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