The Research Of Improving Effect On The Composites Of Nano-Al₂O₃ With Common Chinese Fir

Forest resources of our country is indigent.along with the implement of the national protection project for natural forests and the increase of the demand of timber year by year, the contradiction between supply and demand of timber becomes more and more.so it is necessary to strengthen the development and utilization of the planted forests.Common Chinese fir is an important and own planted forest in our country.It distributes widely, grows fast, owns straight bole, has good machining performances,beautiful texture and special aroma, but its application area is badly restricted by its light and soft structure and low intensity. So it will be necessary to get it modified functionally.Nano-particles'unique properties make nanocomposites become a research hotspot, but the application is not enough in the timber area.By compositing with some nano-particles, most of the disadvantages of timber will be overcome and some unique properties can be gained.In this paper, for the study of composite of Chinese fir with a-nano-Al2O3, which is as wood's modification reagent and infused directly into common Chinese fir, it is made in the tests respectively. Analyse the relation between face abrasion performance and the concentration of a-nano-Al2O3 in aqueous solution.The main researching results are as follow,1. Many comparative experiments show that the dispersion of a-nano-Al2O3 is best, while the dosage of KH-550 is 3% of the weight of a-nano-Al2O3 because of its best degree of pro-oil.2. After the composite experiments, the gaining weight rate of Chinese fir specimens is directly related to its density. The law is that the gaining weight rate becomes smaller with its density increasing. It is clear that low density is in favor of entering of nano particles.3. Face abrasion experiments show that while the concentration of a-nano-Al2O3 is 4%, the surface abrasion of Chinese fir/a-nano-Al2O3 composites specimen is most improved. Its average surface abrasion decreases 35.92%.4. By scanning electron microscopy (SEM) analysis before and after the test, the micro-structure of Chinese fir has changed greatly, a-nano-Al2O3 dispersed floc particles into various parts of the Chinese fir.