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US 8,551,210 B2Granted
Composite article with magnetocalorically active material and method for its production
AssigneeVacuumschmelze GmbH & Co. KG
InventorsGeorg Werner Reppel, Matthias Katter
Life of this patent
Estimating the term…
Abstract
A composite article (1; 10; 40) comprises a plurality of inclusions (5) of a magnetocalorically active material embedded in a matrix (4) of a magnetocalorically passive material. The inclusions (5) and the matrix (4) have a microstructure characteristic of a compacted powder.
Claims34
A composite article, comprising:
- (a) a solid matrix comprising a magnetocalorically passive material and having a microstructure comprising a plurality of particles of magnetocalorically passive material that have lattice structure that exhibits strain, or fractures, or both, from compression, and that, at least in part, touch one or more immediately neighboring particles of magnetocalorically passive material;
- and
- (b) a plurality of solid inclusions comprising a magnetocalorically active material at least partially embedded in the solid matrix, wherein the inclusions either:
- (1) have a microstructure comprising a plurality of particles of magnetocalorically active material that have lattice structure that exhibits strain, or fractures, or both from compression, and that, at least in part, touch one or more immediately neighboring particles of magnetocalorically passive material, or
- (2) form a series of foils, flakes, or tapes embedded in the matrix.
2 more elements
A composite article, comprising:
- (a) a solid matrix comprising a magnetocalorically passive material and having a microstructure comprising a plurality of particles of magnetocalorically passive material that have lattice structure that exhibits strain, or fractures, or both, from compression, and that, at least in part, touch one or more immediately neighboring particles of magnetocalorically passive material;
- (b) a plurality of solid inclusions comprising a magnetocalorically active material at least partially embedded in the solid matrix, wherein the inclusions either:
- (1) have a microstructure comprising a plurality of particles of magnetocalorically active material that have lattice structure that exhibits strain, or fractures, or both from compression, and that, at least in part, touch one or more immediately neighboring particles of magnetocalorically passive material, or
- (2) form a series of foils, flakes, or tapes embedded in the matrix;
- and
- (c) an outer coating of an electrically isolating material disposed on at least some of the particles of magnetocalorically passive material.
3 more elements
A composite article, comprising:
- (a) a solid matrix comprising a magnetocalorically passive material having a sintered microstructure comprising a plurality of grains of magnetocalorically passive material that have lattice structure that exhibits strain relief, and that, at least in part, touch one or more immediately neighboring grains of magnetocalorically passive material via an interface comprising interdiffused atoms from the neighboring grains, resulting from sintering a compressed powder of magnetocalorically passive material;
- (b) a plurality of solid inclusions comprising a magnetocalorically active material at least partially embedded in the solid matrix.
A composite article, comprising:
- (a) a solid matrix comprising a magnetocalorically passive material having a sintered microstructure comprising a plurality of grains of magnetocalorically passive material that have lattice structure that exhibits strain relief, and that, at least in part, touch one or more immediately neighboring grains of magnetocalorically passive material via an interface comprising interdiffused atoms from the neighboring grains, resulting from sintering a compressed powder of magnetocalorically passive material;
- (b) a plurality of solid inclusions comprising a magnetocalorically active material at least partially embedded in the solid matrix;
- and
- (c) an outer coating of an electrically isolating material.
1 more element
A composite article, comprising:
- (a) a solid matrix comprising a magnetocalorically passive material and having a microstructure comprising a plurality of particles of magnetocalorically passive material that have lattice structure that exhibits strain, or fractures, or both, from compression, and that, at least in part, touch one or more immediately neighboring particles of magnetocalorically passive material;
- and
- (b) a plurality of solid inclusions comprising a magnetocalorically active material at least partially embedded in the solid matrix, wherein the inclusions either:
- (1) have a microstructure comprising a plurality of particles of magnetocalorically active material that have lattice structure that exhibits strain, or fractures, or both from compression, and that, at least in part, touch one or more immediately neighboring particles of magnetocalorically passive material, or
- (2) form a series of foils, flakes, or tapes embedded in the matrix, wherein the matrix comprises one or more of BeO, AIN, BN, or graphite.
2 more elements
A composite article, comprising:
- (a) a solid matrix comprising a magnetocalorically passive material and having a microstructure comprising a plurality of particles of magnetocalorically passive material that have lattice structure that exhibits strain, or fractures, or both, from compression, and that, at least in part, touch one or more immediately neighboring particles of magnetocalorically passive material;
- and
- (b) a plurality of solid inclusions comprising a magnetocalorically active material at least partially embedded in the solid matrix, wherein the inclusions either:
- (1) have a microstructure comprising a plurality of particles of magnetocalorically active material that have lattice structure that exhibits strain, or fractures, or both from compression, and that, at least in part, touch one or more immediately neighboring particles of magnetocalorically passive material, or
- (2) form a series of foils, flakes, or tapes embedded in the matrix, wherein the inclusions are present in a volume fraction of between 25% and 98% of the volume of the composite article.
2 more elements
A composite article, comprising:
- (a) a solid matrix comprising a magnetocalorically passive material and having a microstructure comprising a plurality of particles of magnetocalorically passive material that have lattice structure that exhibits strain, or fractures, or both, from compression, and that, at least in part, touch one or more immediately neighboring particles of magnetocalorically passive material;
- and
- (b) a plurality of solid inclusions comprising a magnetocalorically active material at least partially embedded in the solid matrix, wherein the inclusions either:
- (1) have a microstructure comprising a plurality of particles of magnetocalorically active material that have lattice structure that exhibits strain, or fractures, or both from compression, and that, at least in part, touch one or more immediately neighboring particles of magnetocalorically passive material, or
- (2) form a series of foils, flakes, or tapes embedded in the matrix, wherein the matrix comprises a soft magnetic material.
2 more elements
A composite article, comprising:
- (a) a solid matrix comprising a magnetocalorically passive material and having a microstructure comprising a plurality of particles of magnetocalorically passive material that have lattice structure that exhibits strain, or fractures, or both, from compression, and that, at least in part, touch one or more immediately neighboring particles of magnetocalorically passive material;
- and
- (b) a plurality of solid inclusions comprising a magnetocalorically active material at least partially embedded in the solid matrix, wherein the inclusions either:
- (1) have a microstructure comprising a plurality of particles of magnetocalorically active material that have lattice structure that exhibits strain, or fractures, or both from compression, and that, at least in part, touch one or more immediately neighboring particles of magnetocalorically passive material, or
- (2) form a series of foils, flakes, or tapes embedded in the matrix, wherein the inclusions are disposed in a plurality of layers, each layer comprising inclusions of a magnetocalorically active material having a Tc which is different from the Tc of the magnetocalorically active material in an adjacent layer.
2 more elements
A composite article, comprising:
- (a) a solid matrix comprising a magnetocalorically passive material and having a microstructure comprising a plurality of particles of magnetocalorically passive material that have lattice structure that exhibits strain, or fractures, or both, from compression, and that, at least in part, touch one or more immediately neighboring particles of magnetocalorically passive material;
- and
- (b) a plurality of solid inclusions comprising a magnetocalorically active material at least partially embedded in the solid matrix, wherein the inclusions either:
- (1) have a microstructure comprising a plurality of particles of magnetocalorically active material that have lattice structure that exhibits strain, or fractures, or both from compression, and that, at least in part, touch one or more immediately neighboring particles of magnetocalorically passive material, or
- (2) form a series of foils, flakes, or tapes embedded in the matrix, further comprising a surface having at least one channel therein.
2 more elements
A composite article, comprising:
- (a) a solid matrix comprising a magnetocalorically passive material and having a microstructure comprising a plurality of particles of magnetocalorically passive material that have lattice structure that exhibits strain, or fractures, or both, from compression, and that, at least in part, touch one or more immediately neighboring particles of magnetocalorically passive material;
- (b) a plurality of solid inclusions comprising a magnetocalorically active material at least partially embedded in the solid matrix, wherein the inclusions either:
- (1) have a microstructure comprising a plurality of particles of magnetocalorically active material that have lattice structure that exhibits strain, or fractures, or both from compression, and that, at least in part, touch one or more immediately neighboring particles of magnetocalorically passive material, or
- (2) form a series of foils, flakes, or tapes embedded in the matrix;
- and
- (c) an outer protective coating.
3 more elements
A composite article, comprising:
- (a) a solid matrix comprising a magnetocalorically passive material and having a microstructure comprising a plurality of particles of magnetocalorically passive material that have lattice structure that exhibits strain, or fractures, or both, from compression, and that, at least in part, touch one or more immediately neighboring particles of magnetocalorically passive material;
- (b) a plurality of solid inclusions comprising a magnetocalorically active material at least partially embedded in the solid matrix, wherein the inclusions either:
- (1) have a microstructure comprising a plurality of particles of magnetocalorically active material that have lattice structure that exhibits strain, or fractures, or both from compression, and that, at least in part, touch one or more immediately neighboring particles of magnetocalorically passive material, or
- (2) form a series of foils, flakes, or tapes embedded in the matrix;
- and
- (c) an effective porosity.
3 more elements
Dependencies are inferred from the claim text.