The development of dielectric ceramic materials began in the early 20th century. It is the key material for the preparation of basic components in the electronics industry and is widely used in various fields of people's production and life. Over the past decade, with the rapid development of electronic components in communications, home appliances, automobiles, military and other related fields, the market demand for dielectric ceramic materials has been increasing, showing a broad market prospect.
electrically insulating ceramic
Electrical insulating ceramics, also known as device ceramics, have a series of excellent characteristics:
(1) High volume resistivity (greater than 10 at room temperature12Ω · m) and high dielectric strength (greater104kV/m). To reduce leakage loss and withstand high voltage.
(2) the dielectric constant is small (often less than 9). It can reduce unnecessary distributed capacitance values and avoid adverse effects in the circuit; in addition, the smaller the dielectric constant, the smaller the power saving loss generated during use, which is also beneficial to maintain the normal operation of the whole machine.
(3) The dielectric loss under the high frequency electric field is small.
(4) The mechanical strength is high, usually the bending strength is 45 ~ 300MPa, the compressive strength is 400 ~ 2000MPa, and it has the performance of resisting mechanical shock and thermal shock.
(5) Good chemical stability, weathering resistance, water resistance, chemical corrosion resistance, etc.
Electrical insulating ceramics are widely used in baths of metal solutions, molten salt containers, packaging materials, integrated circuit substrates, electrolytic cell linings, metal matrix composite reinforcements, active armor materials, heat sinks, and heating parts of high-temperature furnaces. In the electronics and power industries, insulating ceramics such as insulators, insulating bushings, resistance substrates, coil frames, tube bases and integrated circuit substrates of electronic tube power tubes are mainly used for the installation, protection, support, and insulation of electrical devices., Connection and isolation.
Ceramic capacitors are widely used in household appliances, communication equipment, industrial instrumentation and other fields because of their small size, large capacity, simple structure, excellent high-frequency characteristics, wide variety, low price and ease of mass production. It is one of the foundations of the rapid development of electronic technology.
At present, the share of ceramic capacitors in the entire capacitor industry has exceeded 80%, and there is a growing trend. Depending on the structure, ceramic capacitors can be divided into single-layer ceramic capacitors (wafer capacitors) and MLCCs. With the rapid development of electronic equipment and components to micro, thin layer, hybrid integration and surface mount technology, the demand for MLCC is increasing day by day, MLCC continues to thin media, high layer, small size, large capacity, high reliability development.
Flexible Terminal Multilayer Chip Ceramic Capacitor
(Photo source: Fenghua Gaoke)
According to statistics, in 2018, the global MLCC market size was about $10.5 billion, and it is expected that the market size will exceed $12 billion by 2021, with a compound annual growth rate of 5%. As the world's major consumer electronics production base, China has become a major producer and consumer of ceramic capacitors in the world, and its production and sales volume ranks among the top in the world. With the recovery of downstream user consumption, the market size of MLCC is expanding year by year, and the market size of China's MLCC is expected to be about RMB 63 billion in 2021.
Piezoelectric ceramics is a kind of polycrystal with piezoelectric properties, which has the advantages of high electromechanical coupling coefficient, low price and easy mass production. It is an important part of information functional ceramics and has been widely used in ultrasonic, electronic technology and other fields. The biggest characteristic of piezoelectric ceramics is that they have positive piezoelectric properties and inverse piezoelectric properties.
(Photo from network)
In terms of crystal structure, ceramics belonging to the perovskite type, tungsten bronze type, pyrochlore type, and bismuth layered structure all have piezoelectric properties. At present, the most widely used is the perovskite structure, such as barium titanate, lead titanate, lead zirconate titanate and so on. From the perspective of chemical composition, it can be divided into lead-based piezoelectric ceramics and lead-free piezoelectric ceramics. Because lead is easy to cause harm to human body in the process of production and use, countries in the world are vigorously developing lead-free piezoelectric ceramics. At present, there are hundreds of manufacturers of piezoelectric ceramic materials and devices in China, and the competition is very fierce.
microwave dielectric ceramics
Microwave dielectric ceramics is a key material used in microwave frequency band (mainly 300MHz ~ 30GHz band) circuits as a modern communication. Due to the characteristics of extremely high frequency, extremely short wavelength, large information capacity, strong directivity, penetration and strong absorption capacity of microwave signals, it has been listed as the core component materials of resonators, filters, dielectric waveguide circuits and other microwave components widely used in modern communication in the world.
(photo source: Japan Murata production)
With the development of mobile communication from 4G to 5G network, higher requirements are put forward for microwave dielectric ceramics, that is, to seek a relatively high dielectric constant in order to facilitate the miniaturization of devices, and a high quality factor to ensure excellent frequency selection characteristics and close to zero resonant frequency temperature coefficient to ensure high thermal stability.
With the rapid increase in the popularity of domestic consumer electronics, the consumer electronics industry is developing rapidly, the demand for microwave dielectric ceramics is growing steadily, and the market scale of the industry is expanding. From 2015 to 2017, the average annual growth rate of China's microwave dielectric ceramic industry market reached 6%, and the market size reached 0.784 billion yuan in 2017.