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一、引言独石陶瓷电容器由于其体积小,电容范围宽,可靠性好,结构坚固,作为混合集成电路的外贴元件得到广泛的应用。国内已经大量生产铌镁酸铅—钛酸铅—钨镉酸铅系统瓷料的独石陶瓷电容器。这类电容器在工艺上的最大特点是烧成温度较低,因而采用银电极。但是,它的介电常数ε值约在0℃时为最大,当使用中温度升高,尤其是降低时,ε值会显著下降,这是一个缺点。因而对于要求介电常数温度变化率低的线路设计就不能满足要求。介电常数温度变化率低的瓷料,它们的烧成温度比银的熔点要高,因而提出了研制新的1120℃银—钯系电极和金—钯系电极这一课题。
First, the introduction of monolithic ceramic capacitors due to its small size, wide capacitance range, good reliability, solid structure, as a hybrid integrated circuit components posted outside the widely used. China has mass production of lead magnesium niobate - lead titanate - lead tungsten lead-acid system ceramic monolithic ceramic capacitors. The most prominent feature of this type of capacitor is its lower firing temperature, which makes it possible to use silver electrodes. However, its dielectric constant, ε, is the maximum at about 0 ° C. It is a disadvantage that the value of ε decreases significantly when the temperature increases, especially if it decreases during use. Therefore, the circuit design that requires a low rate of change of dielectric constant temperature can not meet the requirements. Porcelain materials with low dielectric constant temperature change rate are higher than the melting point of silver. Therefore, a new 1120 ℃ silver-palladium electrode and gold-palladium electrode has been proposed.