Alumina is a diverse class of metallic oxides, main polymorphic forms include the most common are type a and y, crystalline transition mainly depends on the temperature. Aluminum hydroxide or hydrated aluminium oxide is heated to 800 degrees Celsius converted into y-alumina and 1200 degrees Celsius converted into a-alumina. Structures and properties of alumina-special features to make it in the electronics, chemical, aerospace and other fields has been widely used. With the development of high technology and society more and more attention on new materials, domestic and foreign workers to pay great attention to the development and application of new materials, all kinds of material with special functionality to get people’s attention. Among them, the micronization of substances considered to be materials development research foundation. Superfine powder usually refers to the scale the so-called molecular, Atomic and macroscopic objects, the granularity (1-100) particles in the nm range.
High pure Super fine Aluminum Oxide Nanopowder is purity in 99.99% above of super micro-powder body material, is 21st century materials in the production maximum, and output Supreme, and uses most wide of tip material is one of, high pure alumina powder body due to its purity high, grain diameter small, displayed out has general material by not has of light, and electric, and magnetic, and heat and mechanical characteristics, thus it as a new function material widely application Yu optical, and chemical and the special ceramic, multiple field. Overseas studies on Nano-alumina work carried out earlier, the technology has advanced. Following is some has representative of research results: in gas phase method in the, United States of Chen y j with gas phase rule prepared out grain diameter for of no reunion alumina nano particles; with gas phase hot solution to three methyl aluminum Al (CH3) 3 and N20 for material, joined C2H4 as reaction sensitive of agent, used C02 laser (C2H4 in C02 laser launches wavelength at has resonance absorption) heating for reaction, Then 1200-1400 deg heat successfully synthesizes A1203 particle diameter of 15-20nm; Japan patent by evaporation-condensation method, alumina (purity of 99.99%) as the evaporation source and put them in a pressure up to 0. 01 Pa in a vacuum, into 02,CO or C02, keeping pressure at 15Pa alumina ceramics using C02 laser irradiation makes it evaporate, in alumina in gas evaporation cools rapidly to get ultra high-purity alumina. In liquid phase method in the, Felde b with sol-gel glue method, to ISO butanol aluminum for precursor body, joined acetyl acetone and ammonium nitrate, by hydrolysis, and sank of formed gel glue, again by dry, and forged burn get grain diameter for 50nm of Alpha-A1203 particles; France of Eponthieu using nitric acid aluminum, and xylene, and tween80 composition micro emulsion system, business got 40-50nm of alumina particles. Study of nano-alumina in China is from the beginning of the 90 ‘s, which was mainly concentrated in the Chinese Academy of Sciences and universities during 10 years in 1990-2000, China to break Western embargo on China. Has set up a variety of physical and chemical method for preparation of nano-materials. Research on Nano-Alumina was also a certain degree of progress.
At present, the preparation of Aluminum Oxide Nanopowder mainly stay at the trial stage, and conducted some exploration of the industrialization level of production, but most of the preparation methods of nano-alumina wide particle size distribution, and poor preparation process is repeated. There are a lot of basic work requires a lot of manpower and resources to complete.