Search

To obtain the influence of FOX-7 particle morphology on its thermal properties and outgassing volume, the typical phase transformation process of FOX-7 was confirmed by in-situ Raman spectroscopy. Differential scanning calorimetry (DSC) was used to compare the crystal transformation and thermal decomposition behaviors of raw FOX-7, recrystallized FOX-7 and crushed recrystallized FOX-7 particles. Vacuum stability tests were used to compare the outgassing rates and outgassing volumes of three FOX-7 with typical particle size and morphology differences. The results show that the first step thermal decomposition peak temperature of FOX-7 particles with more defects is lower than that of recrystallized samples. If the particle size of FOX-7 is small, the endothermic peak of/3to y phase transition disappears on DSC curve. The phase transition process can still be observed while increasing the weight of a single test sample or increasing the heating rate to enhance the thermal effect aggregation in the phase transition process. When the heating time is the same, the total outgassing of FOX-7 with small particle size is larger than that of FOX-7 with large particle size. When there are defects on the surface of large-size particles, the outgassing volume will reach the maximum faster. For the small particles with no obvious defects, its initial outgassing volume is small. However, its total outgassing volume will increase significantly and eventually exceed that of large particle size particles with the extension of heating time. The size of FOX-7 particles determines the total outgassing volume, while the morphology of FOX-7 particles determines the outgassing rate. Aniline stabilizers have good outgassing inhibition effect on FOX-7. [ABSTRACT FROM AUTHOR]

Copyright of Piezoelectrics & Acoustooptics is the property of Piezoelectric & Acoustooptic and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The pumping speed measuring apparatus, which employs the flowmeter method, was introduced. The pressure was measured by using a spinning rotor gauge(SRG) under 1×10-4 to 1×10-2Pa, and the ionization vacuum gauge was used when the pressure was lower than 10-4Pa. A method of measuring the pumping speed and the outgassing rate of the extractor gauge was given. The pumping speed and the outgassing rate of the extractor gauge were measured under the pressure of 10-6 to 10-4Pa. The flowmeter method was used to measure the pumping speed of the miniature sputter ion pump(SIP)in nitrogen and helium. The discharge state of the miniature SIP under different pressures was analyzed using COMSOL, and the experimental results were in good agreement with the theoretical analysis. The combined standard uncertainty of the flowmeter method was less than 4.4%. [ABSTRACT FROM AUTHOR]

Copyright of Arid Zone Research / Ganhanqu Yanjiu is the property of Arid Zone Research Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)