After years of research and development, Associate Professor Su Lihong of Northwestern Polytechnical University has successfully developed a series of manganese-cobalt-nickel ( MCN ) series of multi-element oxide nano-powders that meet the needs of negative temperature coefficient semiconductor ( NTC ) resistor electronic paste applications , and is used in civil applications. The film produced by using the electronic paste prepared by the nano powder has excellent performance test, and has been successfully applied to the manufacture of NTC resistance devices by related companies . This is the first time that NTC nanopowders have been used in the field of industrial electronic components manufacturing, and the material formulation has been serialized by Su Lihong through long-term experiments and has independent intellectual property rights.
Transition metal manganese, copper, silicon, cobalt, iron, nickel and other oxides constitute a semiconductor material, which is a type of thermistor semiconductor material with a negative temperature coefficient ( NTC ) which decreases with increasing temperature . And the most durable NTC resistance materials, mostly oxide ceramics with spinel structure. The device products made of such materials can be widely used in industrial electronic equipment, power supply equipment, test instruments and the like, and can be used for integrated circuit to eliminate electronic circuit surge, precise temperature detection and monitoring, liquid level measurement, air pressure measurement, Fire alarm, meteorological sounding, switching circuit, automatic gain adjustment and other fields can also be used for aerospace infrared detection film, microwave and laser power measurement, etc., with broad market application prospects and strategic value. As a power NTC thermistor, it can suppress high-intensity surge current generated in the circuit when the circuit power is turned on. The NTC thermistor has a large initial resistance, which can suppress excessive current in the integrated circuit line, thereby protecting the power supply circuit and the load. When the circuit enters the normal working state, the NTC thermistor causes the temperature of the resistor body to rise due to the passing current, and the resistance value drops to a small value, which does not affect the normal operation of the circuit. NTC thermistors can be approximated as a perfect integrated circuit auto-recoverable fuse function, so they are widely used in integrated circuits, which are used in everyday mobile phones and computers, mobile base stations, and network servers. A component, where it can be said that there is an integrated circuit, has its presence.
Japanese and American related companies sell monopoly OEMs of such semiconductor nano-powder materials, resulting in nearly 90% of the micro-small high-precision NTC resistors in domestically produced mobile phones and computers . The semiconductor materials are imported from Japan and the United States. Tens of millions of tablets. The traditional domestic NTC resistors are models with large volume and high precision, which cannot meet the requirements of miniaturization, high precision and high integration of large-scale integrated circuits, and related enterprises are facing the pressure of industrial upgrading. High-performance, high-precision, miniaturized thermal devices on ships, airplanes and high-speed rails, in special cases, also face the threat of foreign bans. To solve the localization of nano-semiconductor materials for NTC miniaturized components, there is a critical industrial upgrade with strategic and strategic significance.
Su Lihong has been engaged in the preparation and theoretical research of nano powders. He and the students have carried out many years of transformation on domestic equipment, and through trial and error, the nano-powder uniformity has been greatly improved. The deviation of the obtained particle size distribution can achieve positive and negative 5-100 nm scale controllable and overcome nanomaterials. Prepare a worldwide universal problem in the past two decades of research. Through process and equipment improvements, it is possible to achieve a very good monodispersity of the nanopowder after drying. In terms of detection technology, he also formed a proprietary technology for how to evaluate the dispersibility of nanopowders and analyze sample processing.
Su Lihong's research, in the research and development of China's space satellite technology, has achieved a breakthrough in the improvement of the compactness of nano-powdered films. However, due to the small amount of aerospace, in order to improve the applicability of technology and benefit the general public, Su Lihong has developed the use of nano-powder for residential NTC thermistors by changing formulas and processes for several years , realizing the transition metal oxides of manganese and copper for civilian use. A major innovation in the manufacturing process of semiconductor nano-powder materials composed of two or more kinds of oxides such as silicon, cobalt, iron and nickel is a typical project of military-to-civilian. The obtained powders are all nanometer-scale, which realizes the high uniformity of monodispersion, size and overall spherical morphology of NTC series semiconductor nano-powders. At present, the semiconductor nano-powder made by this technology has formed six series of different resistance and thermal index varieties. By cooperating with many other units, the prototype of the batch device has been produced. This is the first time that China has used nano-semiconductor powder raw materials to prepare micro-precision NTC resistance devices for civilian use . China has become a country that fully grasps the entire industrial chain of semiconductor thermal device manufacturing technology.
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