The Experts below are selected from a list of 21381 Experts worldwide ranked by ideXlab platform
Hideo Nakajima - One of the best experts on this subject based on the ideXlab platform.
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fabrication of lotus type porous stainless steel by continuous zone melting technique and mechanical property
Metallurgical and Materials Transactions A-physical Metallurgy and Materials Science, 2005Co-Authors: Teruyuki Ikeda, Hideo Nakajima, Takeshi AokiAbstract:Lotus-type porous stainless steel (SUS304L) rods were fabricated by the continuous zone melting technique under a pressurized mixed gas of hydrogen and inert gas such as argon or helium. Pores with cylindrical shape, whose growth direction is parallel to the solidification direction, are observed in the rods. The dependence of the porosity and averaged pore diameter on the partial Pressure of hydrogen or the Total Pressure and on the transference velocity of rods was investigated. It was found that the porosity increases with increasing partial Pressure of hydrogen under a Constant Total Pressure and the pore diameter decreases with increasing transference velocity. The maximum porosity was about 60 pct under the experimental conditions in the present work. The observation of the microstructure and the measurement of the tensile strength were also carried out.
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fabrication of lotus type porous stainless steel by unidirectional solidification under hydrogen atmosphere
Materials Transactions, 2002Co-Authors: Teruyuki Ikeda, Michiharu Tsukamoto, Hideo NakajimaAbstract:Lotus-type porous stainless steel SUS304L has been fabricated by unidirectional solidification under mixed gases of hydrogen and argon. The atmospheric Pressure dependence of porosity and pore diameter has been investigated. The porosity is lower if the partial Pressure of argon is higher under a Constant partial Pressure of hydrogen and is higher if the partial Pressure of hydrogen is higher under a Constant Total Pressure of atmosphere composing of hydrogen and argon. Average pore diameter increases with increasing distance from the bottom chill plane. From tensile tests, the ultimate tensile strength of the porous stainless steel with porosity about 50% has been found to be about 7 times lower than nonporous alloy in the direction perpendicular to pore growth direction.
Teruyuki Ikeda - One of the best experts on this subject based on the ideXlab platform.
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fabrication of lotus type porous stainless steel by continuous zone melting technique and mechanical property
Metallurgical and Materials Transactions A-physical Metallurgy and Materials Science, 2005Co-Authors: Teruyuki Ikeda, Hideo Nakajima, Takeshi AokiAbstract:Lotus-type porous stainless steel (SUS304L) rods were fabricated by the continuous zone melting technique under a pressurized mixed gas of hydrogen and inert gas such as argon or helium. Pores with cylindrical shape, whose growth direction is parallel to the solidification direction, are observed in the rods. The dependence of the porosity and averaged pore diameter on the partial Pressure of hydrogen or the Total Pressure and on the transference velocity of rods was investigated. It was found that the porosity increases with increasing partial Pressure of hydrogen under a Constant Total Pressure and the pore diameter decreases with increasing transference velocity. The maximum porosity was about 60 pct under the experimental conditions in the present work. The observation of the microstructure and the measurement of the tensile strength were also carried out.
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fabrication of lotus type porous stainless steel by unidirectional solidification under hydrogen atmosphere
Materials Transactions, 2002Co-Authors: Teruyuki Ikeda, Michiharu Tsukamoto, Hideo NakajimaAbstract:Lotus-type porous stainless steel SUS304L has been fabricated by unidirectional solidification under mixed gases of hydrogen and argon. The atmospheric Pressure dependence of porosity and pore diameter has been investigated. The porosity is lower if the partial Pressure of argon is higher under a Constant partial Pressure of hydrogen and is higher if the partial Pressure of hydrogen is higher under a Constant Total Pressure of atmosphere composing of hydrogen and argon. Average pore diameter increases with increasing distance from the bottom chill plane. From tensile tests, the ultimate tensile strength of the porous stainless steel with porosity about 50% has been found to be about 7 times lower than nonporous alloy in the direction perpendicular to pore growth direction.
Takeshi Aoki - One of the best experts on this subject based on the ideXlab platform.
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fabrication of lotus type porous stainless steel by continuous zone melting technique and mechanical property
Metallurgical and Materials Transactions A-physical Metallurgy and Materials Science, 2005Co-Authors: Teruyuki Ikeda, Hideo Nakajima, Takeshi AokiAbstract:Lotus-type porous stainless steel (SUS304L) rods were fabricated by the continuous zone melting technique under a pressurized mixed gas of hydrogen and inert gas such as argon or helium. Pores with cylindrical shape, whose growth direction is parallel to the solidification direction, are observed in the rods. The dependence of the porosity and averaged pore diameter on the partial Pressure of hydrogen or the Total Pressure and on the transference velocity of rods was investigated. It was found that the porosity increases with increasing partial Pressure of hydrogen under a Constant Total Pressure and the pore diameter decreases with increasing transference velocity. The maximum porosity was about 60 pct under the experimental conditions in the present work. The observation of the microstructure and the measurement of the tensile strength were also carried out.
Michiharu Tsukamoto - One of the best experts on this subject based on the ideXlab platform.
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fabrication of lotus type porous stainless steel by unidirectional solidification under hydrogen atmosphere
Materials Transactions, 2002Co-Authors: Teruyuki Ikeda, Michiharu Tsukamoto, Hideo NakajimaAbstract:Lotus-type porous stainless steel SUS304L has been fabricated by unidirectional solidification under mixed gases of hydrogen and argon. The atmospheric Pressure dependence of porosity and pore diameter has been investigated. The porosity is lower if the partial Pressure of argon is higher under a Constant partial Pressure of hydrogen and is higher if the partial Pressure of hydrogen is higher under a Constant Total Pressure of atmosphere composing of hydrogen and argon. Average pore diameter increases with increasing distance from the bottom chill plane. From tensile tests, the ultimate tensile strength of the porous stainless steel with porosity about 50% has been found to be about 7 times lower than nonporous alloy in the direction perpendicular to pore growth direction.
Klaus J Huttinger - One of the best experts on this subject based on the ideXlab platform.
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chemical vapor infiltration of pyrocarbon ii the influence of increasing methane partial Pressure at Constant Total Pressure on infiltration rate and degree of pore filling
Carbon, 1998Co-Authors: W Benzinger, Klaus J HuttingerAbstract:Chemical vapor infiltration of pyrocarbon was studied at 1100°C and methane Pressures ranging from 5 to 100 kPa. A cylindrically shaped porous alumina ceramic, 20 mm in height and 16 mm in diameter, was used as the substrate. The pore diameters of the porous ceramic range from 1 to 36 μm and the Total porosity amounts to 23%. Theoretical considerations based on the Weisz modulus and the pore effectiveness factor suggested an improved infiltration, particularly for the narrow pores, by increasing the methane Pressure. This suggestion was confirmed by the experimental results. The degree of pore filling increases with the increase in the methane Pressure. The maximum degree of pore filling was achieved at a methane Pressure of 20 kPa. This result as well as the result of a preceding study concerning the effect of methane partial Pressure suggest that the general idea about optimum conditions for chemical vapor infiltration has to be revised.