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US5672387A Expired / Lapsed US ⏱️ 0.0 years remaining

Process for the production of heat- and corrosion-resistant porous metal body

Assignee: Sumitomo Electric Industries Ltd
•
Filing: 1995-06-16
•
Granted: 1997-09-30
•
Expires: 2015-06-16
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Abstract

Abstract A process for the production of a heat- and corrosion-resistant porous metal body which is made of a metal or whose surface layer is made of a metal, in which the porous metal body can be alloyed with chromium or a combination of chromium and aluminum uniformly throughout the entire thereof by adjusting the alloy composition in the following manner, i.e., (A) heat-treating the porous metal body in a mixed gas comprising a gas, generated by heating a powdered mixture comprising chromium or its compound and NH4Cl at 950 DEG to 1100 DEG C., and a diluent reducing gas at 800 DEG to 1100 DEG C., or (B) heat-treating the porous metal body in a mixed gas comprising a gas, generated by heating a powdered mixture comprising aluminum or its compound, chromium or its compound and NH4X, wherein X is I, F, Cl or Br, at a weight ratio of the chromium or its compound to the aluminum or its compound of 10 to 80 in terms of Cr and Al respectively at 950 DEG to 1100 DEG C., and a diluent reducing gas at 800 DEG to 1100 DEG C.

Inventors

  • 👤 Toshiyasu Tsubouchi
  • 👤 Satoru Okamoto
  • 👤 Tomohiko Ihara

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-09 02:13
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/20; B01D39/2027; B01D39/2031; B01D39/2034; C; C23; C23C; C23C10/00; C23C10/06; C23C10/08; C23C10/10; C23C10/12; C23C10/14; C23C10/28; C23C10/30; C23C10/32

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 186 words
A process for the production of a heat- and corrosion-resistant porous body having at least a surface layer of metal, said process comprising placing said body on or apart from a powder, said body not being embedded in said powder, said powder comprising aluminum and/or an aluminum compound, chromium and/or a chromium compound, and N 4 X, wherein X is selected from the group consisting of F, Cl, Br, and I, a weight ratio of chromium to aluminum being 10 to 80, said chromium and/or chromium compound being present in an amount of 15% to 35% by weight, calculated as chromium and based on said powder, heating said powder and said body to 800° to 1100° C. in a heating zone in the presence of a mixed gas comprising a generated gas and a reducing diluent gas, said generated gas resulting from heating said powder to 950° to 1100° C., and said reducing diluent gas being flowed into said heating zone substantially throughout said heating in an amount of 0.01 to 0.06 mol/min per 1 kg, in terms of Cr of said chromium or chromium compound.
Claim 2
Dependent Claim 186 words
A process for the production of a heat- and corrosion-resistant porous body having at least a surface layer of metal, said process comprising placing said body on or apart from a powder, said body not being embedded in said powder, said powder comprising aluminum and/or an aluminum compound, chromium and/or a chromium compound, and N 4 X, wherein X is selected from the group consisting of F, Cl, Br, and I, a weight ratio of chromium to aluminum being 10 to 80, said chromium and/or chromium compound being present in an amount of 15% to 35% by weight, calculated as chromium and based on said powder, heating said powder and said body to 800° to 1100° C. in a heating zone in the presence of a mixed gas comprising a generated gas and a reducing diluent gas, said generated gas resulting from heating said powder to 950° to 1100° C., and said reducing diluent gas being flowed into said heating zone substantially throughout said heating in an amount of 0.01 to 0.06 mol/min per 1 kg, in terms of Cr of said chromium or chromium compound.
Claim 3
Dependent Claim 34 words
A process as set forth in claim 1, wherein at least two runs of a heat cycle comprising temperature rise and temperature fall are included in said heating of said powder and said body.
Claim 4
Dependent Claim 15 words
A process as set forth in claim 1, wherein the reducing diluent gas is hydrogen.
Claim 5
Dependent Claim 24 words
A process as set forth in claim 1, wherein the reducing diluent gas is a mixed gas consisting of hydrogen and an inert gas.
Claim 6
Dependent Claim 17 words
A process as set forth in claim 1, wherein the heat time is 3 to 8 hours.

References Cited (Backward Citations)

CA806618A Cited
US2257668A Cited
GB685683A Cited
DE1189723B Cited
FR1134763A Cited
US3114961A Cited
US3152007A Cited
FR2024463A1 Cited
JPS5090541A Cited
FR2306276A1 Cited
US4132816A Cited
JPS55148759A Cited
FR2576917A1 Cited
FR2576916A1 Cited
GB2271781A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 2000-09-29 2001-03-31 2001-09-30 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2004-09-29 2005-03-31 2005-09-30 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2008-09-29 2009-03-31 2009-09-30 $7700.00 Window Closed / Lapsed

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