| Project/Area Number |
04660182
|
|---|
| Research Category |
Grant-in-Aid for General Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
林産学
|
|---|
| Research Institution | Shizuoka University |
|---|
Principal Investigator |
SOBUE Nobuo Shizuoka University, Fac.of Agr., Associate Professor, 農学部, 助教授 (50023495)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
TAKEMURA Tomio Nagoya University, Fac.of Agr., Professor, 農学部, 教授 (90014919)
HIRAI Nobuyuki Shizuoka University, Fac.of Agr., Professor, 農学部, 教授 (70023439)
甲斐 勇二 静岡大学, 農学部, 教授 (60022068)
|
|---|
| Project Period (FY) |
1992 – 1993
|
| Project Status |
Completed (Fiscal Year 1993)
|
| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1993: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1992: ¥1,200,000 (Direct Cost: ¥1,200,000)
|
|---|
| Keywords | Wood-ceramic composites / Metal alkoxides / Electrical properties / Carbonization / Addition of water glass / Resistivity / 熱伝導率 / 焼成温度 / セラミックスー木材複合化 / チタン酸ナマリ / ジルコン酸ナマリ |
|---|
| Research Abstract |
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.
|
