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采用高温电阻炉制备了两组Cu-43%Zn合金,利用蒸馏法、X射线衍射(XRD)、化学分析方法研究了在氮气和空气气氛下的熔炼过程中,Cu-Zn合金的质量损失与物相转变规律及低熔点合金组元Zn的蒸发、汽化过程。并采用差示扫描量热-热重分析连用(DSC-TGA)方法考察了该合金在氮气和空气气氛下升温状态的蒸发、氧化、汽化、造渣行为。通过采用蒸馏法和化学分析方法测量样品和基体Zn含量的质量损失随时间和温度的变化曲线,得出:试样质量和合金基体Zn含量均随着蒸发温度的升高和时间的延长而降低;在温度一定的条件下,试样质量和基体Zn含量降低到一定值时,保持相对恒定;温度越高,试样质量和Zn含量剩余越少。DSC-TGA的实验结果结合kissinger,Flynn-WallOzawa方程得出:在氮气和空气气氛下Cu-Zn合金汽化峰的表观激活能依次为:5815.28,5107.05 k J·mol~(-1)。
Two sets of Cu-43% Zn alloys were prepared by high temperature resistance furnace. The quality loss of Cu-Zn alloy during the melting process under nitrogen and air atmosphere was investigated by the methods of distillation, X-ray diffraction and chemical analysis. Phase transition law and low melting point alloy Zn evaporation, vaporization process. The properties of evaporation, oxidation, vaporization and slag formation of the alloy under nitrogen and air atmosphere were investigated by DSC-TGA. By using distillation and chemical analysis methods, the mass loss of Zn and the Zn content of samples and matrix were measured with time and temperature. The results showed that the mass of sample and the content of Zn in alloy matrix decreased with the increase of evaporation temperature and the extension of time ; Under certain temperature conditions, the sample quality and substrate Zn content decreased to a certain value, remained relatively constant; the higher the temperature, the lower the sample quality and Zn content. The experimental results of DSC-TGA and kissinger and Flynn-Wall Ozawa equation show that the apparent activation energies of the vaporization peak of Cu-Zn alloy under nitrogen and air atmosphere are 5815.28 and 5107.05 kJ · mol -1, respectively.