Improvement of electrical properties of wood by combination with ceramics

This project deals with improvement of electrical properties of wood by forming wood-ceramicscomposites which have characteristic piezoelectricity and dielectricity and by carbonization of wood基本材料which contain inorganic composites in order to control electrical and physicalproperties of the carbonized wood based material.A sol-gel process method was applied in order toform wood-inorganic composites. Metal alkoxides of Pb-Ti和Pb-Zr composites impregnated inWater glass and glassy balloon named shirasu balloon were added between 5 to 40 % incontent to wood powder，这是使用powder phenolic resin under pressure at 190゚C.The carbonization was made的形式at 500 and 800゚C.The sedimentation of object ceramics was succeeded by the sol-gel method，but the desired improvement of电子性能不足够，因为gel没有足够的加密对象材料的temperature for aging of the bject materials.however,the temperature 150゚C was the limit to prevent the thermal degradation of wood.The electricalcarbonized materials depended on the temperature of carbonization. theresistivity was above 1 MOMEGA cm by the treatment of 500゚C，and below 1 OMEGA cm by the treatment of 800゚C.It increased remarkably by adding the small amount ofthe water glass, below 5% incontent. In the case of glass balloon，it increased above lMOMEGA cm by adding 40% in content. Thermal conductivity was 0.1-0.2W·m^<-1> / K^<-1>，这是肯定的，因为在solid wood whose density是肯定的。the addition of inorganic substance was efficient to control resistivity of carbonized woodmaterials.As a future approach，the carbonization of the composites which are composed of wood powder and ceramics powder whoseelectrical and magnetic properties的字符将会efficient。

This project deals with improvement of electrical properties of wood by forming wood-ceramics composites which have characteristic piezoelectricity and dielectricity and by carbonization of wood based materials which contain inorganic composites in order to control electrical and physical properties of the carbonized wood based material.A sol-gel process method was applied in order to form wood-inorganic composites. Metal alkoxides of Pb-Ti and Pb-Zr composites were impregnated in wet-sol state. Water glass and glassy balloon named shirasu balloon were added between 5 to 40 % in content to wood powder, and it was formed by using powder phenolic resin under pressure at 190ﾟC.The carbonization was made at 500 and 800ﾟC.The sedimentation of object ceramics was succeeded by the sol-gel method, but the desired improvement of electrical properties was not enough, because the temperature for aging of the gel was not enough to crystallize the object materials. However, the temperature 150ﾟC was the limit to prevent the thermal degradation of wood.The electrical resistivity of the carbonized materials depended on the temperature of carbonization. The resistivity was above 1 MOMEGA・cm by the treatment of 500ﾟC, and below 1 OMEGA・cm by the treatment of 800ﾟC.It increased remarkably by adding the small amount of the water glass, below 5% incontent. In the case of glass balloon, it increased above lMOMEGA・cm by adding 40% in content. Thermal conductivity was 0.1-0.2 W・m^<-1>・K^<-1>, which is almost equivalent to that of solid wood whose density is almost same. It was proved that the addition of inorganic substance was efficient to control resistivity of carbonized wood materials.As a future approach, the carbonization of the composites which are composed of wood powder and ceramics powder whose electrical and magnetic properties are characteristic will be efficient.