(1.College of materials science and technology, Liaoning Technical University; 2.College of science Liaoning Technical University Liaoning Fuxin 123000)
Nano-alumina has many outstanding characteristics such as high strength, high hardness, abrasion resistance, high temperature resistance, large surface area and strong adsorption capacity, so it is widely used in space industry, abrasive materials, fine ceramics, refractory materials, catalysis materials, optical materials, etc. Among various polymorphs, α-Al2O3 and γ-Al2O3 are the most widely used. The preparation technology of Nano-aluma develops constantly with the in-depth research. In this paper, the traditional preparation methods of Nano α-alumina and γ-alumina powder, such as vapor phase method, solid phase method and liquid phase method, are introduced briefly, and their respective advantages and disadvantages are also analyzed. Aiming at problems arisen, combined with the research of recent years, improved methods and technics are reviewed. New preparation method combination and innovations on raw materials, methods and approaches are briefly summarized; some application suggestions are given based on the characteristics of the powder, so as to give some reference and inspiration to the researchers on Nano-alumina in the future.