Primary Study On Recombination And Performance Of Ceramic-wood Composite

Ceramic-wood composite is a kind of new composite materials, which is produced by an appropriate composite method with wood as matrix and inorganic ceramic as reinforcement. The study of Ceramic-wood composite based on composite material's theory and technology endowed the wood and ceramic of those two traditional materials with new meaning and had specifically scientific and significant meaning as follows: Many properties of plantation wood were improved, such as mechanics, decay resistance, fire-resistance and dimensional stability. This creative research carried out by making use of theory and technology in materials research field and the superiorities of marginal and inter-cross disciplines provided the theoretical and scientific bases for the development new wood-based composite.In this paper, ceramic-wood composite was produced by the method of sol-gel with 1-69 poplar (Populus deltoides), which was abundant in our country, as the raw materials. In order to obtain materials of high performance to meet the need of furniture material, inner decorating material and outer building material, we took the method of preparing the Sol at first and then impregnating the wood. The sol was impregnated and diffused into the wood by force through a vacancy-press equipment, which insured the sol impregnate into the inner of the wood at its maximum, thus the sol can form gel in the holes of the wood reacting as the purpose of filling on the one hand, on the other hand, it provided the conditions for the happen of bonding effect between the gel and the cell wall of wood.The study showed:1.The gel was effective in filling the spaces of the wood, it mainly filled in the woody fibers and vessels of the cellular clearances and distributed along the cell wall. The gel grains were homogenously distributed and took the shape of stick and slice. The gel grains in the holes of wood's vessel cell looked like a string of beads, while the gel in pit of the cell wall took the form of grains. The average weight percent gain of the wood increased to 81.3% compared to the former studyof 36.1%.2.X-ray Photoelectron Spectroscopy (XPS) showed that a new absorbing apex came forth in the position of 960cm-1 owing to the form of Si-O-C as the result of condensation reactions between gel and cell wall.3.When sol entered into the wood, the core reaction was condensation, including the condensation reactions between sol itself and condensation reactions between the sol and the hydroxyls on the cell wall of the wood, which leaded to one part of SiO2 gel bonded with fibrin and another part of SiO2 Gel consisted in holes of wood in the physical filling way, it realized the goal of composite the inorganic SiO2 to the inner tissue of wood, thus the performances of the materials were optimized or improved. Compared to the untreated the Populous, the radial compress and longitudinal compress of ceramic-wood composite improved 60.4% and 102.3% respectively; the tangential shrink ratio of the ceramic-wood composite was 46.1% of the untreated wood.4.The performances of ceramic-wood composite were improved more when the methyl was imported to the net of gel by making use of co-hydroxylation between MTES (methyl triethoxy silane) and TEOS (tetraethyl orthosilicate). The performances of Ceramic-wood composite such as decay resistance, dimensional stability and effloresce resistance were improved owing to the introduction of the cymene, which reducing the inner stress of gel net, meliorating the brittleness and reducing the absorbility of gel. The study showed that when the ceramic-wood composite was soaked in the boiling water for 1.5 hours, the weight loss was 6.2%; the weight gain was 5.4% when it was marinated in the water for 2 hours; The hygroscopes of the ceramic-wood composite were only 40% and 50% of wood-inorganic composites and untreated the Populous respectively when it was treated under the saturated steam at normal temperature. As to the ceramic-wood composite of 80.5% WPG (weight percent gain), its radial, tangential and volume shrink c...