Microwave plasma synthetic material
Microwave plasma synthesis of nanomaterials experimental setup is shown . In order to obtain particles of each of nanomaterials wrapping , designed in a quartz tube in a plasma reaction zone 2 . The microwaves generated by the magnetron energy distributor , the microwave distribution among the two waveguide branches . A typical experiment, the reaction zone by the plasma gas flow rate of 4m3 / h; hydrogen and oxygen mixed gas carrying volatile chlorides of steam into the plasma reaction zone.
    Synthesis of nanocrystalline ZrN
Typically , ZrN There are two methods of synthesis . One method is by an electron beam or laser evaporation of pure metal , and then nitrided in the gas phase . Some people have used a laser in a nitrogen atmosphere under pressure of 0.1MPa volatile metals Zr, to obtain an average particle size of 14nm, the maximum particle size of 40nm ZrN, however , the product powder is a black rather than gold or brass , which indicates the product in the presence of excess nitrogen . Another method is to use the wrong chloride together with the nitrogen
Percent. According to thermodynamic analysis, fault chloride under conventional heating with the nitrogen nitride direct synthesis is difficult , and the reaction of hydrogen and ammonia were added to drive the reaction to produce nitrides direction. In the plasma atmosphere , and the reaction was ionization dissociation kinetics to overcome the resistance , reducing the reaction temperature , so that the direct synthesis of nitrogen chloride and the reaction can be carried nitride . Experimental results show that by a microwave plasma , the wrong chloride , nitrogen, and ammonia as reactant can be synthesized by a particle size of 4nm-8nm of ZrN, and the reaction temperature above 900 ℃ drop