Papers by Keyword: Liquid Coating

Abstract: (Bi_1.5Zn_0.5)(Zn_0.5Nb_1.5)O₇ (BZN) ceramic samples were prepared by solid state reaction. B₂O₃ was introduced by liquid coating technology with H₃BO₃ solution in the BZN ceramic specimen to reduce its sintering temperature. The sintering behavior, phase composition and dielectric properties of ceramics were investigated by X-ray diffraction, scanning electron microscopy and vector network analyzer. The (Bi_1.5Zn_0.5)(Zn_0.5Nb_1.5)O₇ ceramic composite could be sintered well at 900°C for 3h when 0.9M/l H₃BO₃ was added and showed good dielectric properties of ε_r=150,Q×f=228,τ_f=-362ppm/°C.

Abstract: Ba₂Ti₉O₂0 ceramics were prepared with different additives of B₂O₃ by liquid coating method and solid phase mix method. The sintering behavior, phase structure and dielectric properties of ceramics were investigated by X-ray diffraction, scanning electron microscopy and inductance-capacitance resistance analysis. The liquid coating method can reduce the amount of sintering aid and minimized the negative impact of sintering aid on dielectric properties. A ceramic composite which could be sintered well at 900°C for 3h and showed good dielectric properties of εr=42,tanδ=0.002 and TCF=-4ppm/°C（1MHz）was obtained when 1.0mol/l H₃BO₃ was added to the Ba₂Ti₉O₂₀ ceramic.

Abstract: (Bi1.5Zn0.5)(Zn0.5Nb1.5)O7 (BZN) ceramic samples were prepared by solid state reaction, In order to reduce the sintering temperature of BZN ceramic we have used liquid coating technology to dope CuO by precursor solution of CuSO4. The sintering behavior, microstructures, phase structures, and dielectric properties were studied. The process reduces the amount of sintering aid and minimized the negative impact of sintering aid on dielectric properties. A ceramic composite which could be sintered well at 900°C and showed good dielectric properties of εr=161,tanδ=0.005 and TCF=-398ppm/°C（1MHz）was obtained when 0.5mol/l CuSO4 was added to the (Bi1.5Zn0.5)(Zn0.5Nb1.5)O7 ceramic.

Abstract: In this paper, the catalyst precursors were coated on the surface of natural flake graphite with micron size by liquid coating method. Carbon with one-dimensional nanostructures formed on the surface of graphite after the heat treatment of the mixture of phenolic resin and coated graphite. The effects of the forms and amounts of catalyst precursors and the temperature on the formation of carbon with one-dimensional nanostructures were studied. And the thermal conductivities of the samples were measured. The results showed that the catalyst precursor with the form of NiO would be better. And the optimum amounts of the catalyst precursor were 1mass % ~2 mass % of resin. It was not conducive to the reaction when the temperature was too low or too high, but 1100°C was appropriate. The thermal conductivities of samples were increasing with the increase of the qualities of carbon with one-dimensional nanostructure.

Abstract: This article studied on the surface modification of ammonium nitrate by the liquid coating technology , choosing separately polyvinyl acetate (PVAC), sliced paraffin (Wax),polyethylene glycol (PEG) as coating materials. The samples were characterized by SEM and DSC. The experimental results showed that the modification effects of PVAC and Wax were good. The appearance of modified ammonium nitrate presented spherical, and flowing property was better. Their moisture absorption descended respectively by 30.6%, 23.3% after 24 hours at ambient temperature 30°C and relative humidy 75%.