| Integrated circuit is a small circuit which commits subminiature circuits on one substrate. The output of the semiconductor integrated circuit taking semiconductor material as the substrate is very large, and it is in the central position of electronic technology now. Semiconductor integrated circuit is usually encapsulated in the shell of integrated circuit, in order to protect integrated circuit from being damaged by external machinery and chemistry corrode. Most low-priced integrated circuits are encapsulated in plastics, however, plastics are nonwatertight (water is a formidable enemy to integrated circuit) and because hot expansion coefficient between plastics and integrated circuit material is different, which produces shortcoming of stress with integrated circuit completely .Therefore, integrated circuit which is used in stricter environment and requires high reliability must adopt the ceramic substrates. This kind of ceramic relies mainly on alumina ceramic in the present market. With the development of material technology, the material whose performance speciality has not been brought into full play yet so far, will turn to be the low-priced materials of high performance because of the development of raw materials synthetic technology and manufacturing process. Especially talc ceramic in the article, it can be compounded with a large number of the materials which are stored in on the earth . According to its special nature and modified result, it is hopeful to be used in practice with the cost lower than the alumina. This text studies preparation conditions and performance influence factor of dielectric ceramic based Talc, which will present excellent capability after sintered at high temperature. The basic relevant theory knowledges of the electric ceramic are also introducted briefly in the article, including electron and ion displacement polarization, and their respective effects on dielectric constant and tangent of dielectric loss angle. Furthermore, through Clausius-Mosotti equation and Debye formula the influence factors of dielectric constant and tangent of dielectric loss angle in different fields are also analysed. The experiment regards talc and clay of high quality and at a reasonable price as main raw materials that come from Haicheng in Liaoning Province, making auxiliary raw materials with several kinds of Carbonate and Oxide, under the high temperature of 1280 Centigrades, the dielectric ceramic based Talc is synthesized artificially by adopting the way of high temperature solid phase. By utilizing XRD, IR, DSC , SEM , Omnipotent material experiment machine etc., it is found that the slight changes of prescription will result in the significant differences on the performance of sintered ceramic, which is discussed in detail in this text. Experiment determines the best prescription of the ceramic through changing the kind of doped agents and their relative quantities constantly first of all, and tries to find out and receives various kinds of process mains of talc ceramic during this course, including calcining temperature and time, temperature's going up and down mechanism, balling medium, surface-active agent and the choice of plasticizer when shaped, etc. And then through the test of powder δ electric potential, whiteness, XRD, etc. of the powder ground under different conditions the surface characteristics of the powder are analysed. Finally through experimenting and testing analysis nearly one hundred times, the performance changes of ceramic doped relatively with MnCO3 and ZnO is discussed. Experiment verifies: the ceramic doped with Mn2+ can make the crystalline grains contact each other closer and their sizes be more even, because Mn2+ can replace Mg2+ of MgSiO3 and form solid melt. So it plays good function on the stabilization of electric performance. In the experiment, oxidize manganese and oxidize zinc mix, through sintering manganese zinc oxide is made to use as doped material. In the production MnCO3 is often added, which decomposes... |
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