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爆轰合成纳米超微金刚石的热稳定性研究 总被引:1,自引:0,他引:1
用差热、热失重和X射线衍射分析对爆轰合成纳米超微金刚石的热稳定性进行了研究,分析了不同合成和提纯条件以及不同气氛对超微金刚石热稳定性的影响。研究结果表明,纳米超微金刚石在空气氛中的热稳定性较差,其起始氧化温度为500~530℃;在惰性和还原性气氛中具有较好的热稳定性;包裹水条件下得到的金刚石及用H2SO4+KMnO4提纯得到的超微金刚石的热稳定性较好。 相似文献
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用炸药爆轰的方法制备了纳米超微金刚石,用X射线衍射,透射电镜,激光拉曼光谱,红外吸收光谱,差热和热失重等表征了纳米金刚石超微粉的特性,分析了合成材料对纳米金刚石结构和生质的影响,纳米超微金刚石兼具纳米颗粒和超硬材料的双重特性。 相似文献
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The damage properties of polymer bonded explosives under dynamic loading were studied by using ultrasonic evaluation. Explosive samples were damaged by a low-velocity gas gun at different impact velocities. Ultrasonic examination was carried out with a pulse through-transmission method. Spectra analyses were carried outby using fast Fourier transform. Characteristic ultrasonic parameters, including ultrasonic velocities, attenuation coefficients, spectra area and master frequency, were obtained. The correlation between the impact damage and ultrasonic parameters was analyzed. A damage coefficient D was defined by considering a combination of ultrasonic velocity and amplitude. The results show that ultrasonic parameters can be used to quantitatively assess the damage extent in impacted plastic bonded explosives. 相似文献
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