成都電子科技大學(xué)碩士生英語聽說與讀寫

1、Summary Of Electronic Ceramic MaterialsChiness name：梁福霞：梁福霞Engnish name：LucyStructure and ApplicationDevelopment direction點(diǎn)擊添加文本 點(diǎn)擊添加文本contentsBasic conceptsBrief history of the developmentWhat is the electronic ceramicsElectronic ceramics is a kind of norganic non metallic solid materialThe main ch

2、emical bonding force is the ionic bond and covalent bond Using its electric, magnetic, sound, light, heat, and other direct effects and coupling effect to achieve a function of advanced ceramic materialsHow does the development history?After a World War,the demand of the high performance of motor ve

3、hicles and aircraft engine spark plug promotes the development of high electrical insulating materialsIn the two World War,Universal application of ceramic capacitors in electronic equipment promotes the development of dielectric ceramicsIn 1940s, barium titanate ferroelectric ceramics with spontane

4、ous polarization has been developedIn 1960s, the lead zirconium titanate piezoelectric ceramics are developed for the wide use of the energy exchange device In 1980s,Superconducting ceramics are developed In early twenty-first Century, graphene was successfully isolated.How does the structure?It is

5、a polycrystalline multiphase materials microstructureStructure of PCBM of HOMO and LUMOWhat areas of application?The earliest ceramics, making chinawareSuperconducting ceramic used in stealth fighterNano materials of electronic ceramicsElectronic ceramic thin filmElectronic deviceElectricity supplie

6、rs communication fieldHow does the development direction?miniaturizationWith the rapid development of mobile communication and satellite communication, the requirements for miniaturization of devices are becoming more and more urgent.In particular, the use of electronic ceramic materials based on va

7、rious types of passive components, is the main bottleneck of the miniaturization of the whole machine. Therefore, miniaturization (including chip) is an important target for research and development of components, the market demand is also very strong.High frequency and frequency seriesHigh frequenc

8、y is the inevitable trend of the development of digital 3C products. To mobile communication as an example, the main characteristics of the first generation mobile communication is in the 800 900MHz, the second generation mobile communication with digital signal as the main characteristics is 900MHz

9、 and 1.8GHz,at present, the frequency of the third generation mobile communication system is studied in 2GHz.How to adapt to the high working frequency is a severe challenge to the ceramic material of all kinds of electronic components.Therefore, it is a hot research topic in the field of new electr

10、onic components to find the functional ceramic material with good high frequency characteristics and series of working frequency.Integration and modularizationAt present, the mobile phone and notebook computer to further more convenient, more functional, full digital and high integration and low cos

11、t direction development, greatly promoted the electronic components of the chip, miniaturization and low cost and device combination, functional integration of the development process.Integrated functional ceramic components are based on low temperature cofired ceramic as the platform,multilayer cer

12、amic technology is adopted to integrate the capacitance, inductance and resistance material into the low temperature cofired ceramic substrate, forming a passive integrated ceramic device.Lead free and environmental coordinationIn recent years, with the requirement of environmental protection and su

13、stainable development of human society, the research and development of new environmentally friendly iron voltage ceramics has become one of the hot research and development of the developed countries.In 2001, the European Parliament passed a decree on the limits of harmful substances in electrical and electronic equipment, and has scheduled to be implemented in 2008, which is limited to the use of substances including lead based piezoelectric devices.The deve