High-Frequency Ceramic Materials
Development and Study of Ceramic Materials Having Special Properties: Dielectric Permittivity , Low Losses and Low Values of Temperature Permittivity Coefficient (TPC) Together with Up-to-date Technology of Processing of these materials into Articles
Tech Area / Field
3 Approved without Funding
TsKB of Special Radiomaterials, Russia, Moscow
Project summaryThe purpose of the project is to study and to develop new high-frequency ceramic materials with dielectric permittivity (e = 10 ё 100) for devices and components of radio and electronic apparatuses in order to further increase their working efficiency and reliability together with significant decrease of their mass and size.
Nowadays there is a row of Russian and foreign high-quality ceramic materials with dielectric permittivity more than 10. They have been synthesized within various oxide systems, such materials as "Rasdomix" of Japan firm "Murata", as ceramics R-38 of US firm "Raychon" and our materials with the trade marks ТЛ/-47; ТЦ/-750; ТЛ/-750 are among them. However the value of the temperature permittivity coefficient of these materials is about (750 ± 200) ґ 10-6, that makes it impossible to use them in the devices answering the demands of high functional stability.
The materials the development of which is provided for in this project are to have minimal dielectric losses tgd Ј (2 ґ 10-4 ё 5 ґ 10-4), high dielectric permittivity, (e = 25, 35, 60, 90), high thermostability and mechanical durability. They must be more solid and have the class of surface smoothness not less than С 14.
At the same time these materials must be synthetised within the systems with minimal number of the initial components in order to improve the technology and to achieve significant cuts in spendings.
The methods of mathematical and computer modeling are to be used in the project in order to cut down the number of the variables under investigation.
The study of the influence of different additives on the process of caking and on the physic and mechanical properties of the resulting materials presents a definite interest in this work.
Yet, the main scientific result of the work is the conceiving of a theoretical model of the structure of ceramic materials with high dielectric permittivity and strength and construction of a parametric row of these materials on its base. The model and the row will serve as the most convenient tool when developing the technology of synthesis and formation of articles and when studying phase, structural, physical, mechanical and electrophysical characteristics of the materials.
Working out such materials will make it possible to produce new in principle, highly reliable and stable instruments and devices which will find their use in medicine, aviation, radioelectronics, computing and other branches of industry.
Central design office of special radiomaterials has got much experience in creating and use of new ceramic materials, and has specialised in the field of development of radiomaterials for weapons.
The most efficient solutions of the tasks of the project make it necessary that not only native scientists and engineers but some foreign specialists-coexecutors as well must take part in fulfillment of the job.
The project under consideration is of significant interest for a number of firms, namely such firm as "Kerasorb Absorbertechnik" of Germany has already expressed its interest in the use of the new highfrequency, thermostable ceramic materials.
These materials are sure to find wide application as the substrates of microcircuits, as the components of phase inverters or as the base of delay lines and etc. Firm "Kerasorb Absorbertechnik" is ready to conduct physical, mechanical and electro-physical tests of samples of the new materials and to consider practical aspects of the use of these materials.
Within the process of development Central Design Office of Special Radiomaterials will exchange information, received on the stages of theoretical searches, methods of computer modeling and technological processes with the named firm.