Preparation Of Nano-metal Oxides And Their Application In Thermite

The combustion temperature and flame intensity of the thermite in the combustion process are important factors that affect its combustion effect and application performance.In addition,the thermite has a very broad application prospect in the military and civilian fields.According to the combustion theory of pyrotechnics,combined with the research status of aluminothermic agents at home and abroad,it is proposed to add nano-iron oxides to the thermite to improve the combustion performance of the thermite.The preparation process of nano-iron oxides was studied by using metal nitrate as oxdidant,water-soluble hydrazine fuel as reducing agent and metal complex as dispersing agent.Nano-NiFe₂O₄ powder with good dispersibility was successfully prepared by self-propagating combustion method.The grain size and crystal structure of the products were analyzed by SEM,XRD and TEM.Finally,the optimal process conditions were established.The prepared nano-NiFe₂O₄ powder has a particle size of 40-80 nm,and the product has a uniform particle size distribution and good dispersibility.NiFe₂O₄ can improve combustion performance in military pyrotechnics.The nano-NiFe₂O₄ powder was added into the Al/Fe₂O₃ base formulation and the Al/Fe₃O₄ base formulation.The thermite was prepared by compression molding.The combustion temperature and combustion effect of the thermite containing nano-NiFe₂O₄ powder were studied.Through the design of a large number of formulations of aluminothermic agents,the optimal formulation of the thermite has been established,the temperature of which can reach above 2600°C.In addition,the A3 steel plate with a thickness of 6 mm can be also quickly penetrated,indicating that damage effect is excellent.The infrared radiation characteristics and regularity of the thermite with nano-NiFe₂O₄powder in the range of 3⁵?m and 8¹4?m were studied.By studying the infrared radiation properties of Al/Fe₃O₄ series thermite,it was found that with the content of NiFe₂O₄ increase,the radiation area of the drug gradually increases.The radiance of the agent in the range of3⁵?m increases with the increase of the ratio of NiFe₂O₄.The radiance of the agent increases with the increase of the ratio of NiFe₂O₄.But the radiation brightness of the reagent in this band is less than that of Al/Fe₃O₄ thermite.By studying the infrared radiation properties of Al/Fe₂O₃ series of thermite,with the increase of the ratio of NiFe₂O₄,the radiation area of the agent generally showed an increasing trend;the radiance of the agent at 3⁵?m generally increased with the proportion of NiFe₂O₄.The radiant brightness of the agent increased with the increase of the ratio of NiFe₂O₄;the radiant brightness of the agent was smaller than that of the Al/Fe₂O₃ aluminum heat agent in the band of 3⁵?m and 8¹4?m.