Symmetrical continuous gradient structure silicon nitride ceramic antenna housing and preparation method thereof
A technology of silicon nitride ceramics and gradient structure, which is applied to ceramic products, radiation unit covers, and other household appliances, etc. It can solve the difficulty of synergy between wave transmission and mechanical properties, the inability to achieve integrated precise molding, and the thermophysical properties of gradient structural units Incompatibility and other problems, to achieve the effect of coating deposition rate, rapid and uniform preparation, and mechanical properties improvement
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[0055] The preparation process of the core layer includes a gel injection molding preform, a drying and degumming treatment of the preform, and the preparation of a certain content of nitride matrix in the preform.
[0056] The whisker preform is first shaped. According to the thickness of the core layer optimized in step 1, the mold required for forming the radome is designed. Add solvent deionized water (H 2 O), dispersant ammonium polyacrylate (PAA-NH 4 ), pH adjuster tetramethylammonium hydroxide (TMAH), wetting agent polyethylene glycol 400 (PEG-400), organic monomer acrylamide (AM), crosslinking agent N,N-methylenebispropylene amide (MBAM), silicon nitride whisker (Si 3 N 4w ), filler Si 3 N 4 Powder, BN nanosheets and appropriate amount of ball-milling beads are ball-milled to obtain silicon nitride whisker slurry. When preparing the slurry, the pore size and open porosity of the preform can be controlled by adjusting the volume ratio of the silicon nitride whisk...
Embodiment 1
[0076] Step (1) Electromagnetic performance simulation and broadband transmission performance optimization of radome
[0077] The material parameters are optimized by CST software, and the thickness d of the surface material can be obtained. 1 =1mm, the dielectric constant of the surface material ε 1 1 2 =4mm, the dielectric constant ε of the core material 2 2 When <0.01, the wave transmittance of the gradient structure silicon nitride ceramic is greater than 80% in the frequency range of 0-13.5GHz.
[0078] Step (2) Preparation of Symmetrical Continuous Gradient Structure Silicon Nitride Ceramic Radome Core Layer
[0079] Add 25wt.% deionized water (H 2 O), 0.3 wt.% ammonium polyacrylate (PAA-NH 4 ), 2wt.% tetramethylammonium hydroxide (TMAH), 1.5wt.% polyethylene glycol 400 (PEG-400), after mixing, 55wt.% silicon nitride whiskers ( Si 3 N 4w ), 10wt.% Si 3 N 4 Powder, ball mill dispersed for 4h. Continue to add 5.5 wt.% acrylamide (AM) and 0.4 wt.% N,N-methylenebis...
Embodiment 2
[0091] Step (1) Electromagnetic performance simulation and broadband transmission performance optimization of radome
[0092] By optimizing the parameters of the material by CST software, the thickness d of the surface material can be obtained 1 =1mm, the dielectric constant of the surface material ε 1 1 2 =4mm, the dielectric constant ε of the core material 2 2 When <0.01, the wave transmittance of the gradient structure silicon nitride ceramic is greater than 80% in the frequency range of 0-13.5GHz.
[0093] Step (2) Preparation of Symmetrical Continuous Gradient Structure Silicon Nitride Ceramic Radome Core Layer
[0094] Add 25wt.% deionized water (H 2 O), 0.3 wt.% ammonium polyacrylate (PAA-NH 4 ), 2wt.% tetramethylammonium hydroxide (TMAH), 1.5wt.% polyethylene glycol 400 (PEG-400), after mixing, 55wt.% silicon nitride whiskers ( Si 3 N 4w ), 10 wt.% BN nanosheets, ball milled and dispersed for 4 h. Continue to add 5.5 wt.% acrylamide (AM) and 0.4 wt.% N,N-methyl...
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