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低软化点硼硅酸盐微晶玻璃的研究
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摘要
由于低软化点玻璃和微晶玻璃同时具有低的熔化温度和封接温度,因此在封接、导电浆料等领域得到了广泛的应用。多年以来,铅玻璃一直被用作低软化点的玻璃,但随着环保意识的增强,铅玻璃必将被淘汰,而可用于低软点玻璃的硼硅酸盐玻璃体系,由于具有良好的热稳定性、化学稳定性以及适应性强、成本低等优点,势必引起人们的重视。
     本课题以对具有低的软化温度和熔融温度玻璃的研究为主旨,通过调整玻璃中各氧化物的含量,来研究不同组分的含量变化对玻璃各特征温度和化学稳定性的影响规律。利用差示热分析(DSC)、X射线衍射(XRD)和扫描电镜(SEM)等测试手段,研究了玻璃组分和热处理制度的不同,对低软化点微晶玻璃的力学性能、化学稳定等方面的影响规律。
     研究结果表明:在硼硅酸盐玻璃的成型范围内,玻璃的软化温度、熔融温度以及化学稳定性会随着玻璃组分中氧化物含量的变化而变化。实验采用二步热处理法得到低软点微晶玻璃,热处理制度和玻璃组分的不同可以改变微晶玻璃的晶相种类,进而影响微晶玻璃的性能。当玻璃组分中ZnO的含量不变,核化温度为580℃、晶化温度为730℃时,微晶玻璃的主晶相为钛酸锌相,次晶相为锌钙透辉石相;抗弯强度最大可达120.4MPa,体积密度最大为2.75g/cm~3,吸水率最小为0.17%。调节玻璃的组分,当玻璃组分中ZnO的含量为20%,制成的微晶玻璃晶相分布均匀、致密。抗弯强度最大为140MPa,显微硬度最大为690.6Hv,体积密度最大为2.8g/cm~3,且微晶玻璃的化学稳定性好。
The low-softening glass and glass-ceramics with the low melting temperature and sealingtemperature, were widely applied in sealing and conductive slurry field. For years,Lead glass has beenused to the low-softening glass. As the strengthening of environmental protection consciousness, leadglass will be eliminated. The low-softening Borosilicate glass system, which has good thermal stability,chemical stability, water resistance and mechanical properties, will cause the attention of people.
     For the purpose of low softening glass and low melting glass,this paper studied the Characteristictemperature and Chemical stability of the glass by adjusting the content of oxides. With the different heattreatment temperature and oxides the mechanical properties and Chemical stability of the low softeningglass ceramics were studied by means of DSC, XRD, and SEM.
     The results showed that: In the forming range of glass, the Chemical stability softening and meltingtemperature of the glass were changed with the different content of oxides. The low softeningglass-ceramics was obtained by two-step heating treatment process. The different heat treatmenttemperature and oxides can change the crystallization phase of glass-ceramics, influence theperformance of glass-ceramics.when the content of ZnO is not changed,the Nucleation temperature was580℃and Crystallization temperature was730℃,the main crystallization phase of glass-ceramics wasZinc titanate, the second phase were petedunnite, the maximum bending strength of the glass-ceramics is120.4Mpa,the maximum density was2.75g/cm~3,and the minimum water absorptivity was0.17%. whenthe content of ZnO is20%,these crystallization phases were dense and uniform。the maximum bendingstrength of the glass-ceramics is140Mpa,the maximum hardness of the glass-ceramics is690.6Hv,themaximum density was2.8g/cm~3,and the chemical stability was good.
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