The chip multilayer ceramic capacitor (MLCC) is formed by disposing the ceramic dielectric film of the printed electrode (internal electrode) in a dislocation manner, forming a ceramic chip by one-time high-temperature sintering, and sealing the metal layer on both ends of the chip. (External electrode), thus forming a monolith-like structure, it is also called a monolithic capacitor.
MLCC is one of the main components used in electronic whole machines. It was born in the 1960s. It was first developed by American companies. Later, it was rapidly developed and industrialized in Japan by Murata, TDK, and Taiyo. MLCC is the world's largest and fastest growing chip component.
MLCC has large capacity, low equivalent resistance, excellent noise absorption, good pulse current resistance, small size, high insulation resistance, good impedance temperature characteristics and frequency characteristics, and good self-sealing characteristics. Effectively avoid moisture and contamination of the internal electrodes, significantly increasing the arcing voltage and breakdown voltage.
As a basic electronic component, MLCC is widely used in information, military, mobile communications, electronic appliances, aviation, petroleum exploration and other industries.
Manufacture of MLCC
The MLCC is manufactured by using a barium titanate-based ceramic or the like as a medium, and the pre-formed ceramic slurry is cast into a ceramic dielectric film having a thickness of less than 10 μm, and then the inner electrode is printed on the dielectric film and printed thereon. The ceramic dielectric diaphragm of the inner electrode is alternately laminated and hot pressed to form a plurality of capacitors in parallel, which is sintered at a high temperature to form an integral chip which is not divided, and then the outer electrode paste is coated on the end of the chip to make the inner electrode A good electrical connection is formed and then restored by rewarming to form the two poles of the chip ceramic capacitor.
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A typical manufacturing process for MLCC
MLCC market overview
MLCC has become the main ceramic capacitor due to its large capacity, high life, high temperature and high pressure resistance, small size and low cost, accounting for about 93% of the ceramic capacitor market.
Currently, according to the market classification of MLCC products, its main applications are:
Military industry
Military MLCC, as a basic electronic component, is used more and more in military, electronic equipment such as aviation, aerospace, military mobile communication equipment, pocket military computers, weapon warhead control and military signal monitoring, radar, artillery fuze, warships, and weapon systems. .
Industrial
The industrial capacitor market mainly includes: system communication equipment, industrial control equipment, medical electronic equipment, automotive electronics, precision instrumentation, and petroleum exploration equipment. Industrial equipment is developing towards mechatronics and intelligence. The application of electronic control, data analysis, and interface display information is increasing. It will provide a broad market prospect for industrial high-reliability MLCC products.
Consumer
The consumer market includes general consumer products and high-end consumer products. The former includes electronic products such as notebook computers, televisions, telephones, ordinary mobile phones, and ordinary digital cameras. The latter includes professional recording equipment, professional video equipment, and high-end smartphones. High-end electronic products. Compared with the demand for military and industrial MLCC products, the consumer products market has the largest demand.
At present, the main manufacturers of MLCC are: KEMET in the United States; Murata, Kyocera, Maru and TDK in Japan; Samsung in South Korea; Guoju, Huaxinke and Heshentang in Taiwan; and Yuyang and Fenghua in the mainland. Three rings.
The development trend of MLCC
miniaturization
Miniaturization can bring a lot of added value to the equipment. In the development of electronic components, miniaturization is an eternal trend. The MLCC, one of the world's largest and fastest growing chip components, is no exception. Notebooks, mobile phones, etc., which are everywhere in daily life, are becoming smaller and smaller, and are becoming lighter and lighter. In order to cater to the increasingly lightweight features of these electronic devices, MLCC products must also become more and more self-contained. small.
high capacity
In recent years, the notebook computer and mobile phone market have continued to expand, the data transmission speed of digital products has gradually increased, the memory capacity and function types have been increasing, and the demand for high-capacity MLCC has expanded rapidly.
High reliability
With the rapid development of science and technology, the area of human exploration is becoming wider and wider, and in some places in these areas, the environment is getting worse and worse, and the requirements for electronic products are becoming more and more demanding. Under these conditions, the performance of MLCC products It is also required to achieve higher stability.
Environmental protection
As people's living standards become higher and higher, the improvement of the environment is getting more and more attention. The MLCC products contain a part of lead, which has strong volatility and is destructive to the human body and the environment. Develop environmentally friendly products to replace lead materials.
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