Microwave-assisted Heating Synthesis Of Carbonitride-coated Metal Composites

The metal-coated composites can combine the excellent properties of the metal nanoparticles and coated materials.There are multiple combinations between metal core and the coated materials,which makes metal-coated composites have great potential application value and attracts extensive attention of researchers.At present,metal-coated composites are prepared by arc-discharge method,chemical vapor deposition method,pyrolysis method,ion beam method and other methods.However,there are still many problems in these methods such as high requirements for preparation equipment,high energy consumption,poor product purity and so on.We have made a new attempt to prepare metal-coated composites.First,the pure metal nanopowders(Fe,Co,Ni,Mo,Cu)were prepared by arc-discharge method.Then we synthesize the composite materials by microwave-assisted heating approach.Further,the structural characteristics of the composites were determined by XRD,SEM,TEM,XPS,FT-IR and Raman.We found that the mixture of pure metal(Fe,Co,Ni)and urea could form coating structure.When the microwave treatment time was 1 min,the sample absorbing performance is the best.The mixture of pure metal(Mo,Cu)and urea formed solid solution structure by microwave-assisted heating approach,and the electromagnetic absorption performance of the samples was not different from original metal.In this paper,the carbonitride-coated metal composites synthesize by microwave-assisted heating approach and we made a preliminary investigation.The research shows that this method can successfully prepare the encapsulated metal composite material and provide a more efficient and rapid method for the preparation of the metal-coated composites.