EP0115688A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Reaction sintered cermet and use thereof in electrolytic cell in aluminum reaction
Assignee: Cambio Ragione Sociale corning Inc
•
Filing: 1983-12-21
•
Granted: —
•
Expires: 2003-12-21
Abstract
Abstract Cermet body formed by reaction sintering at pressures ranging from subatmospheric to superatmospheric of admixed and shaped reactants, which can be elements, compounds, intermetallic compounds and/or alloys, in stoichiometric proportions to substantially form 30-95 mole percent of first phase or phases being boride, carbide, nitride, silicide, sulfide or combination thereof of one or more of the elements of Groups 2a, 3a exclusive of B, 4a, 2b, 3b including lanthanide and actinide series elements, 4b, 5b, 6b, 7b and 8, and 5-70 mole percent of second phase or phases being metal, alloy, intermetallic compound or combination thereof of one or more of the elements of Groups 3a exclusive of B, 4a, 1b, 2b, 4b, 5b, 6b, 7b and 8, wherein the maximum grain size of the first phase or phases is substantially not greater than 10 pm and which body contains 0 to 4 weight percent oxygen. This cermet body is useful in component in electrolytic cell for aluminum production.
Inventors
- 👤 Thomas Peter Deangelis
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 05:39
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/04; C22C1/05; C22C1/051; C04; C04B; C04B35/00; C04B35/622; C04B35/64; C04B35/645; B; B22; B22F; B22F3/00; B22F3/23; C04B35/515; C04B35/5156; C04B35/5158; C04B35/56; C04B35/5607; C04B35/5611; C04B35/565; C04B35/573; C04B35/58; C04B35/58007; C04B35/5805; C04B35/58064; C04B35/58071; C04B35/58078; C04B35/58085; C04B35/58092; C04B35/581; C04B35/626; C04B35/63; C04B35/632; C04B35/65; C25; C25C; C25C3/00; C25C3/06; C25C3/08
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
205 words
A reaction sintered cermet body consisting essentially of a fine-grained, homogeneous, intimate interdispersion of: (a) 30-95 mole percent of first phase or phases having a maximum grain size substantially not greater than 10 µm and being boride, carbide, nitride, silicide, sulfide or combination thereof of one or more of the elements of Groups 2a, 3a exclusive of B, 4a, 2b, 3b including lanthanide and actinide series elements, 4b, 5b, 6b, 7b and 8, and (b) 5-70 mole percent of second phase or phases being metal, alloy, intermetallic compound or combination thereof of one or more of the elements of Groups 3a exclusive of B, 4a, 1b, 2b, 4b, 5b, 6, 7b and 8; which body contains 0 to 4 weight percent oxygen and is prepared by the process comprising: (c) admixing particulate reactants of maximum particle size substantially not greater than 150 pm and being elements, compounds, intermetallic compounds, alloys or combination thereof in stoichiometric proportions to substantially form the first and second phases, and (d) shaping and heating the admixture to form the reactive sintered body, the heating being done in nonreactive atmosphere and at temperature at which the reaction and sintering occurs between the reactants to substantially form the first and second phases.
Claim 2
Dependent Claim
205 words
A reaction sintered cermet body consisting essentially of a fine-grained, homogeneous, intimate interdispersion of: (a) 30-95 mole percent of first phase or phases having a maximum grain size substantially not greater than 10 µm and being boride, carbide, nitride, silicide, sulfide or combination thereof of one or more of the elements of Groups 2a, 3a exclusive of B, 4a, 2b, 3b including lanthanide and actinide series elements, 4b, 5b, 6b, 7b and 8, and (b) 5-70 mole percent of second phase or phases being metal, alloy, intermetallic compound or combination thereof of one or more of the elements of Groups 3a exclusive of B, 4a, 1b, 2b, 4b, 5b, 6, 7b and 8; which body contains 0 to 4 weight percent oxygen and is prepared by the process comprising: (c) admixing particulate reactants of maximum particle size substantially not greater than 150 pm and being elements, compounds, intermetallic compounds, alloys or combination thereof in stoichiometric proportions to substantially form the first and second phases, and (d) shaping and heating the admixture to form the reactive sintered body, the heating being done in nonreactive atmosphere and at temperature at which the reaction and sintering occurs between the reactants to substantially form the first and second phases.
Claim 3
Dependent Claim
21 words
A body as claimed in claim 1 characterised in that the shaping and heating are substantially simultaneous steps of hot pressing.
Claim 4
Dependent Claim
42 words
A body as claimed in claim 1 or claim 2 characterised in that the mean grain size of the first phase or phases is not greater than 6 µm and the mean particle size of the reactants is less than 100 µm.
Claim 5
Dependent Claim
42 words
A body as claimed in claim 3 characterised in that the maximum grain size of the first phase or phases is substantially not greater than 5 µm and the maximum particle size of the reactants is substantially not greater than 44 µm.
Claim 6
Dependent Claim
54 words
A body as claimed in any of claims 1 to 4 characterised in the first phase or phases being boride, carbide, nitride, silicide, sulfide or combination thereof of.one or more of the elements of Groups 4b, 5b and 6b, and having the second phase being Al, alloy or intermetallic compound thereof, or combination thereof.
Claim 7
Dependent Claim
34 words
A body as claimed in claim 5 characterised in that the second phase is Al which at least partially separates the grains of boride and is in thin layers less than 1000A in thickness.
Claim 8
Dependent Claim
35 words
A body as claimed in any of claims 1 to 6 characterised in that it has 45-95 mole percent of the first phase or phases and 5-55 mole percent of the second phase or phases.
Claim 9
Dependent Claim
59 words
A component of an electrolytic aluminum production cell which in use is normally in contact with molten aluminum or in electrical contact with another component which is normally in contact with molten aluminum, characterised in that it has a surface and/or inner portion made of the reaction sintered cermet body as claimed in any of claims 1 to 5.
Claim 10
Dependent Claim
14 words
An electrolytic aluminum production cell comprising one on-more components as claimed in claim 8.
Claim 11
Dependent Claim
25 words
A method of producing aluminum byelectrolysis in an electrowinning or electrorefining cell characterised in that a cell component as claimed in claim 8 is used.
Claim 12
Dependent Claim
30 words
A method of forming a body as claimed in claim 1 comprising: (a) admixing the particulate reactants, and (b) shaping and heating the admixture to form the reactive sintered body.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.