Spherical powder for thermal barrier coating and preparation method thereof
A technology of spherical powder and thermal barrier coating, which is applied in the field of ceramic powder preparation, can solve the problems of degradation of thermophysical and mechanical properties, reduced strain tolerance, high thermal conductivity, etc., to achieve automatic operation and reduce thermal conductivity The effect of high efficiency and simple preparation process
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[0026] The invention discloses a method for preparing spherical powder for thermal barrier coatings, which comprises the following steps: weighing CaWO in proportion 4 、CaMoO 4 , Nb 2 o 5 / Ta 2 o 5 as raw material. In this raw material, CaWO 4 、CaMoO 4 and Nb 2 o 5 / Ta 2 o 5 The purity of each is greater than 99.9%, and the particle size is 100-800nm. In the present invention, the CaWO in the raw material 4 、CaMoO 4 and Nb 2 o 5 / Ta 2 o 5 The molar ratio of is x:(1-x):1; wherein, 02 o 5 +xCaWO 4 +(1-x)CaMoO 4 =Ca(W x Mo 1-x ) RE 2 o 9 .
[0027] Then, the raw materials and the molten salt are mixed uniformly by ball milling, followed by drying, sieving and calcining in sequence. In the present invention, the molten salt is preferably potassium chloride, sodium chloride or sodium sulfate. Adding molten salt helps to reduce the reaction temperature and time. After adding molten salt, the calcination temperature drops from 1700 to 1800°C to 900 to 1500°C ...
Embodiment 1
[0036] This embodiment specifically includes the following steps:
[0037] Weigh 2658.2g of niobium pentoxide, 959.6g of calcium tungstate, 1333.5g of calcium molybdate, molten salt Na 2 SO 4 500g and 2Kg of absolute ethanol, put them together in a ball mill jar, mix them, seal them and put them on a planetary ball mill for 360min (rotation speed: 500r / min, zirconia balls weigh 16Kg) to make them evenly mixed, and then grind the balls The solution was dried at 80°C for 24 hours and passed through a 300-mesh sieve, and then pre-fired at 1500°C for 10 hours.
[0038] Utilize a crusher to crush the grown and hardened particles, weigh 10Kg zirconia balls and 2Kg mixed powder, place 5Kg of deionized water in a ball mill and mill to 800nm (the ball milling time is 360min, and the ball mill rotating speed is 600r / min). The filter removes the water from the powder solution. Weigh 12Kg of deionized water and 2Kg of PVA powder, place them in a glue machine, heat them to 90°C, and ...
Embodiment 2
[0044] This embodiment specifically includes the following steps:
[0045] Weigh 4418.2g of tantalum pentoxide, 959.6g of calcium tungstate, 1333.5g of calcium molybdate, molten salt Na 2 SO 4 3356g, 2Kg of absolute ethanol, wherein the ratio of raw material to molten salt is weighed at 2:1. Place them together in a ball mill jar for mixing, seal them, and place them on a planetary ball mill for 300 minutes (rotating speed: 500r / min, zirconia ball weight 18Kg), so that they can be mixed evenly, and then dry the milled solution at 80°C for 24 After passing through a 300-mesh sieve, it was pre-fired at 900°C for 10 hours.
[0046] Utilize the crusher to crush the grown and hardened particles, weigh 14Kg zirconia balls and 3Kg mixed powder, place 4Kg of deionized water in a ball mill and mill to 1000nm (the ball milling time is 360min, and the ball mill rotating speed is 600r / min); then use A filter press removes water from the powder solution.
[0047] Weigh 12Kg of PVA pow...
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