With the development of science and technology, we often need both to adapt to high temperature and high pressure, high hardness of the material conditions, but also has to luminescent, conductive, electromagnetic, adsorption and other special properties of materials. Therefore, people need to continue to develop ultra-fine powder material of this emerging system.
At present the research and development of ultrafine powder materials by the national attention. Japan Advanced Micro powder material development involving 70 companies, more than 50 research institutions in Korea Institute of Science and Technology Research Institute put forward scientific and technological development strategies and five-year development plan referred to the next generation of technological innovation to create a role in starting the project, but also listed including fine ceramics, including Advanced Micro powder material Britain set up a new type of advanced materials manufacturing technology centers, research, including Advanced Micro Devices, including ceramic powder materials the U.S. National Key Technologies Group forecast a number of crucial to the future development of the nation's The key technologies, including materials synthesis and processing, electronics, optical materials, ceramic materials and composites, and in the 20th century, the early 90s took the inclusion of nano-technology "Government key technologies" and the importance of the early 21st century research.
Because of the intensified efforts to develop new varieties are endless. In the past two Germany Degussa company launched a series of different uses SiO2 varieties, such as the A200, A300 used in polyester gel coating, R972 as a special resin and rubber modified Rheological agents dedicated SiO2 U.S. PPG Introduces Matting Agent Ultrafine SiO2 series of new varieties. According to preliminary statistics, SiO2 the development of new varieties more than ten companies involved in dozens of varieties. In addition, the U.S. mineral industry in North America has been established to cover more than 30 ultra-fine calcium carbonate production plant, production of different brands of calcium carbonate, Japan has developed a PTC thermistor with barium titanate, there are a number of companies to jointly develop the silicon nitride new materials, and to adapt to the electronic parts and components, the application of synthetic resins and insulators investment ?500,000,000 to establish the world's first synthetic diamond Mica factory the United States has developed a thermal shock cobalt aluminum titanate ceramic Norway has developed a multi-purpose ZrO2 , involving more than a dozen companies.
Ultrafine powder material with extraordinary effect. If the ultra-fine powder of inorganic material or pigment added to the ink or paint, it will brilliant and luminous. Add paint adhesion degrees can greatly enhanced. Nano-carbon black to white rubber given high tensile strength, tear and abrasion resistance. R-Fe2O3 ultrafine powder used in audio or video tapes, the information is stored more than 10 times the ordinary powder. During the Gulf War, the U.S. stealth fighters F-117A attack aircraft due to its coating on the surface of the tungsten cobalt - ferrite ultrafine powder precursor materials adsorbed layer, in the implementation of its 1200 air strike on many occasions without a injury. In addition, Advanced Micro Devices powder material with the reduced size, specific surface area increases, the surface effect lead to material mechanical properties, thermal conductivity material than the general good. Ultrafine powder material will enable the optical properties and electrical properties change, such as TiO2, ZnO, PbO and other metal oxide nanoparticles into the cosmetics or certain materials to prevent the effects of ultraviolet radiation. Copper is a good conductor, but not conductive nano-copper, and the silicon dioxide insulator in 20nm when it started with electrical conductivity.
Ultrafine powder of inorganic materials have a wide range of uses. It can be in the paper, paint, plastic, light industry, metallurgical industry as fillers and functional materials in coatings, pigments for flame retardants in electronics, aviation industry for cutting-edge field of capacitors can also be material, sensitive material components, ultra - hard materials, superconducting materials and optical, electrical, magnetic, wave absorption material (anti-infrared, radar concealed material) and so on. Ultrafine powder as a result of inorganic materials and a wide range of uses special performance, its value will be improved significantly. In general, AMD powder material prices high than that of ordinary powder 3 to 5 times, and some even several times. Therefore, the development of targeted materials ultrafine powder has become an irresistible trend.
Overall, inorganic ultrafine powder material for future development has the following four trends:
--- Micronized
Ultrafine powder more than a decade ago in the material object of study is more than 1um powder, and powder materials in recent years, Advanced Micro Devices research has progressed to the nanoscale. With the smaller the particle size so that their performance enhancements, and will enable the light, electricity, magnetic properties and package. For example, the Japanese electronics company developed nano-scale piezoelectric ceramic material strength is the traditional piezoelectric ceramic materials 3 times.
--- High-purification
High purification is to achieve the characteristics of the material itself, to prevent external interference of impurities, such as fine ceramics of light, electricity, magnetic materials and superconducting materials require high purity.
High purity can have a tremendous value-added products, 99.998% of ZrO2 refractories prices for general use ZrO2 300 times, is the electronic materials used ZrO2 more than 50 times.
--- Function and composite
Functional and composite materials is the people's pursuit of the outcome of performance, but also high-tech development needs. If the new type of capillary-like styrene - diethylene basic ion exchange resins in the composition of r-Fe2O3 magnetic materials, is not only a super-paramagnetic materials, at room temperature with a strong magnetic, and have a good optical transparency. Because of its special features that make it in color imaging and printing shown very good results. Function is the core of materials, science and technology development needs of the various functions of the composite material is designed to artificially given material new features to improve the old function. For example, in zirconia add a small amount of stabilizing agent, strength and toughness would be greatly enhanced over the past can only do ZrO2 refractory ceramics, structural ceramics become the leader in anti-fracture strength greatly increased. Again, containing antimony oxide tin oxide sub-micron level, not only conductive and transparent.
--- Refinement
The refinement of materials refers to the refinement of powder properties, such as its particle size, particle size distribution, particle shape, surface area, pore volume, pore size, crystal phase, conductive, magnetic, optical absorption, a series of optical performance, Different powders have different requirements. Such as different types of paper on the different requirements of calcium carbonate crystal SiO2 package different shape, will produce different results.
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