Reaction sintered oxide-boride
AssigneeCorning Glass Works
InventorThomas P. DeAngelis
Life of this patent
Estimating the term…
Abstract
Ceramic 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 10-90 mole percent of boride phase or phases of one or more of elements of Groups 3b including lanthanide and actinide series elements, 4b, 5b and 6b, and 10-90 mole percent of oxide phase or phases of one or more of elements of Groups 3a, 4a, 3b, 4b, 5b, 6b and 8, and which phases have a maximum grain size substantially not greater than 15 .mu.m. Body in a form for wear resistance and corrosion-erosion resistance has a virtual absence of open porosity, e.g. not greater than 5% or less than about 3%, and a Rockwell A hardness of greater than 90.
Claims24
A reaction sintered oxide-boride ceramic body consisting essentially of a fine-grained, homogeneous, intimate interdispersion of:
- (a) 10-90 mole percent of boride phase or phases having a maximum grain size substantially not greater than 15 .mu.m and being boride of one or more of the elements of Groups 3b including lanthanide and actinide series elements, 4b, 5b and 6b, and
- (b) 10-90 mole percent of oxide phase or phases having a maximum grain size substantially not greater than 15 .mu.m and being oxide of one or more of the elements of Groups 3a, 4a, 3b, 4b, 5b, 6b and 8;
- which body is prepared by the process comprising;
- (c) admixing particulate reactants of maximum particle size substantially not greater than 150 .mu.m and being elements, compounds, intermetallic compounds, alloys or combination thereof in stoichiometric proportions to substantially form the boride and oxide phases, and
- (d) shaping and heating the admixture to form the reaction 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 boride and oxide phases.
A reaction sintered oxide-boride ceramic body having a virtual absence of open porosity and consisting essentially of a fine-grained, homogeneous, intimate interdispersion of:
- (a) 10-90 mole percent of boride phase or phases having a maximum grain size substantially not greater than 15 .mu.m and being boride of one or more of the elements of Groups 3b including lanthanide and actinide series elements, 4b, 5b and 6b, and
- (b) 10-90 mole percent of oxide phase or phases having a maximum grain size substantially not greater than 15 .mu.m and being oxide of one or more of the elements of Groups 3a, 4a, 3b, 4b, 5b, 6b and 8;
- which body is prepared by the process comprising;
- (c) admixing particulate reactants of maximum particle size substantially not greater than 150 .mu.m and being elements, compounds, intermetallic compounds, alloys or combination thereof in stoichiometric proportions to substantially form the boride and oxide phases, and
- (d) shaping and heating the admixture to form the reaction 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 boride and oxide phases.
A reaction sintered oxide-boride ceramic body having not greater than 5% open porosity and consisting essentially of a fine-grained, homogeneous, intimate interdispersion of:
- (a) 10-90 mole percent of boride phase or phases having a maximum grain size substantially not greater than 15 .mu.m and being boride of one or more of the elements of Groups 3b including lanthanide and actinide series elements, 4b, 5b and 6b, and
- (b) 10-90 mole percent of oxide phase or phases having a maximum grain size substantially not greater than 15 .mu.m and being oxide of one or more of the elements of Groups 3a, 4a, 3b, 4b, 5b, 6b and 8;
- which body is prepared by the process comprising;
- (c) admixing particulate reactants of maximum particle size substantially not greater than 150 .mu.m and being elements, compounds, intermetallic compounds, alloys or combination thereof in stoichiometric proportions to substantially form the boride and oxide phases, and
- (d) shaping and heating the admixture to form the reaction 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 boride and oxide phases.
A reaction sintered oxide-boride ceramic body having less than about 3% open porosity and consisting essentially of a fine-grained, homogeneous, intimate interdispersion of:
- (a) 10-90 mole percent of boride phase or phases having a maximum grain size substantially not greater than 15 .mu.m and being boride of one or more of the elements of Groups 3b including lanthanide and actinide series elements, 4b, 5b and 6b, and
- (b) 10-90 mole percent of oxide phase or phases having a maximum grain size substantially not greater than 15 .mu.m and being oxide of one or more of the elements of Groups 3a, 4a, 3b, 4b, 5b, 6b and 8;
- which body is prepared by the process comprising;
- (c) admixing particulate reactants of maximum particle size substantially not greater than 150 .mu.m and being elements, compounds, intermetallic compounds, alloys or combination thereof in stoichiometric proportions to substantially form the boride and oxide phases, and
- (d) shaping and heating the admixture to form the reaction 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 boride and oxide phases.
Dependencies are inferred from the claim text.