The performance characteristics of carbonized wood
Carbonized wood is a modified product of high temperature heat treatment of wood. Compared with ordinary wood, it has a series of characteristics:
The hygroscopicity and water absorption are significantly reduced. Since the hygroscopic free hydroxyl functional groups of wood are greatly reduced after high temperature heat treatment, the hygroscopicity of wood can be reduced by about 51%.
The equilibrium moisture content is significantly reduced during use, and the dimensional stability is greatly improved. Due to the reduced hygroscopicity of wood, under the same air state, the equilibrium moisture content of carbonized wood can be reduced by about 50% compared with conventional wood.Dimensional stability is usually expressed by the chordwise or radial swelling of wood. Since the hygroscopicity of carbonized wood is significantly reduced, its swelling will also be reduced accordingly, so the dimensional stability is greatly improved ( about 42%).
The biological corrosion resistance is obviously improved. During the carbonization process, the hemicellulose of the wood is degraded to generate free acetic acid, and the wood extract is volatilized at high temperature, which cuts off the food chain of the decaying fungi and improves the biological decay resistance of the carbonized wood.
The volatilization of the extract is beneficial to wood gluing and surface finishing.
The color of the wood is beautiful, uniform and durable, and the "carbonization" process at different temperatures can be used to simulate the color of precious tree species.
The hardness and compressive strength along the grain of the wood are improved.
The elastic modulus of wood increases slightly.
The density of wood is slightly reduced (about 3%).
The flexural strength of wood is reduced, but not by much. The strength of wood has a great relationship with its density. The decrease in the density of carbonized wood will cause the strength to decrease; however, the hygroscopicity and equilibrium moisture content of carbonized wood are significantly reduced. Under the same use environment, the moisture content of carbonized wood is significantly lower than that of carbonized wood. For conventional wood, the strength of the wood increases with the decrease of the sorption moisture content, so the strength compensation due to the decrease of the moisture content eventually makes the flexural strength of the carbonized wood decrease slightly (about 5%).
The brittleness of wood increases, and the impact flexural strength and shear strength are significantly reduced (the former is reduced by about 25%, and the latter is reduced by about 20%)
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