Abstract
Porous ceramics incorporates pores to improve several properties including thermal insulation maintaining inherenet ceramic properties such as corrosion resistance and large mechanical strength. Conventional porous ceramics is usually fabricated through an insufficient sintering. Since the sintering accompanies the exclusion of pores, it must be terminated at the early stage to maintain the high porosity, leading to degraded strength and durability. Contrary to this, we have innovated superplastically foaming method to make ceramic foams only in the solid state. In this method, the previously inserted foam agent evaporates after the full densification of matrix at around the sintering temperature. Closed pores expand utilizing the superplastic deformation driven by the evolved gas pressure. The typical features of this superplastically foaming method are listed as follows, 1. The pores are introduced after sintering the solid polycrystal. 2. Only closed pores are introduced, improving the insulation of gas and sound in addition to heat. 3. The pore walls are fully densified expecting a large mechanical strength. 4. Compared with the melt foaming method, this method is practical because the fabrication temperature is far below the melting point and it does not need molds. 5. The size and the location pores can be controlled by the amount and position of the foam agent.
| Original language | English |
|---|---|
| Title of host publication | IOP Conference Series: Materials Science and Engineering |
| Volume | 18 |
| Edition | SYMPOSIUM 12 |
| DOIs | |
| Publication status | Published - 2011 |
| Event | 3rd International Congress on Ceramics, ICC3 - Osaka, Japan Duration: Nov 14 2010 → Nov 18 2010 |
Other
| Other | 3rd International Congress on Ceramics, ICC3 |
|---|---|
| Country | Japan |
| City | Osaka |
| Period | 11/14/10 → 11/18/10 |
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ASJC Scopus subject areas
- Materials Science(all)
- Engineering(all)
Cite this
Superplastically foaming method to make closed pores inclusive porous ceramics. / Kishimoto, Akira; Hayashi, Hidetaka.
IOP Conference Series: Materials Science and Engineering. Vol. 18 SYMPOSIUM 12. ed. 2011. 182002.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Superplastically foaming method to make closed pores inclusive porous ceramics
AU - Kishimoto, Akira
AU - Hayashi, Hidetaka
PY - 2011
Y1 - 2011
N2 - Porous ceramics incorporates pores to improve several properties including thermal insulation maintaining inherenet ceramic properties such as corrosion resistance and large mechanical strength. Conventional porous ceramics is usually fabricated through an insufficient sintering. Since the sintering accompanies the exclusion of pores, it must be terminated at the early stage to maintain the high porosity, leading to degraded strength and durability. Contrary to this, we have innovated superplastically foaming method to make ceramic foams only in the solid state. In this method, the previously inserted foam agent evaporates after the full densification of matrix at around the sintering temperature. Closed pores expand utilizing the superplastic deformation driven by the evolved gas pressure. The typical features of this superplastically foaming method are listed as follows, 1. The pores are introduced after sintering the solid polycrystal. 2. Only closed pores are introduced, improving the insulation of gas and sound in addition to heat. 3. The pore walls are fully densified expecting a large mechanical strength. 4. Compared with the melt foaming method, this method is practical because the fabrication temperature is far below the melting point and it does not need molds. 5. The size and the location pores can be controlled by the amount and position of the foam agent.
AB - Porous ceramics incorporates pores to improve several properties including thermal insulation maintaining inherenet ceramic properties such as corrosion resistance and large mechanical strength. Conventional porous ceramics is usually fabricated through an insufficient sintering. Since the sintering accompanies the exclusion of pores, it must be terminated at the early stage to maintain the high porosity, leading to degraded strength and durability. Contrary to this, we have innovated superplastically foaming method to make ceramic foams only in the solid state. In this method, the previously inserted foam agent evaporates after the full densification of matrix at around the sintering temperature. Closed pores expand utilizing the superplastic deformation driven by the evolved gas pressure. The typical features of this superplastically foaming method are listed as follows, 1. The pores are introduced after sintering the solid polycrystal. 2. Only closed pores are introduced, improving the insulation of gas and sound in addition to heat. 3. The pore walls are fully densified expecting a large mechanical strength. 4. Compared with the melt foaming method, this method is practical because the fabrication temperature is far below the melting point and it does not need molds. 5. The size and the location pores can be controlled by the amount and position of the foam agent.
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U2 - 10.1088/1757-899X/18/18/182002
DO - 10.1088/1757-899X/18/18/182002
M3 - Conference contribution
AN - SCOPUS:80052097942
VL - 18
BT - IOP Conference Series: Materials Science and Engineering
ER -