Preparation method of ferrite/reducing metal composite particles and method for preparing high-temperature stealth coating based on laser 3D printing
A 3D printing and metal composite technology, applied in metal processing equipment, process efficiency improvement, additive manufacturing, etc., can solve problems such as insufficient bonding force, difficult to control microstructure, and inability to guarantee electromagnetic performance, and achieve good fusion and coating. Strong temperature/weather resistance, good combination effect
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Embodiment 1
[0035] Embodiment 1: The preparation method of the ferrite / reducing metal composite particles used in this example is prepared by a mixing and granulation process, and the specific preparation method is completed through the following steps:
[0036] Step 1, the particle size diameter is 80nm, spherical Fe 3 o 4 Particles, particle size diameter of 50nm, spherical Al particles and polyvinyl alcohol (PVA) additives according to Fe 3 o 4 The mass ratio to Al is 3.2:1, and the additive dosage is 0.5% of the total mass of the ferrite powder and the reducing metal powder to uniformly mix to obtain a slurry;
[0037] Step 2. The obtained slurry is granulated by centrifugal spray drying and granulation; the spray drying process parameters are as follows: the inlet temperature of the spray drying tower is 220°C, the outlet temperature of the spray drying tower is 100°C, and the spray drying tower is atomized The rotational speed of the disk was 20000r / min. After the granulation is...
Embodiment 2
[0052] Embodiment 2: In this embodiment, the method for preparing a high-temperature stealth coating based on laser 3D printing is carried out according to the following steps:
[0053] The preparation method of the ferrite / reducing metal composite particles used in this example is prepared by a mixing and granulation process, and the specific preparation method is completed through the following steps:
[0054] Step 1, the particle size diameter is 100nm, spherical BaFe 12 o 19 Particles, particle size diameter of 50nm, spherical Al particles and additives (methyl cellulose (CMC)) according to BaFe 12 o 19 The mass ratio of particles to Al particles is 3.2:1, the amount of additives is 1% of the total mass of ferrite powder and reducing metal powder, and the slurry is obtained after uniform mixing;
[0055] Step 2. The obtained slurry is granulated by centrifugal spray drying and granulation; the spray drying process parameters are: the inlet temperature of the spray dryin...
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