OPEN-CELLED, POROUS SHAPED BODY FOR HEAT EXCHANGERS
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Abstract
An open-cell porous shaped body for heat exchangers comprises a thermomagnetic material selected from, for example,
- (1) compounds of the general formula (I)
(AyBy−1)2+δCwDxEz (I)
- where
- A is Mn or Co,
- B is Fe, Cr or Ni,
- C, D and E at least two of C, D and E are different, have a non-vanishing concentration and are selected from P, B, Se, Ge, Ga, Si, Sn, N, As and Sb, where at least one of C, D and E is Ge or Si,
- δ is a number in the range from −0.1 to 0.1,
- w, x, y, z are numbers in the range from 0 to 1, where w+x+z=1.
-
Citations
8 Claims
-
1-4. -4. (canceled)
-
5. A process for producing an open-cell porous shaped body having a porosity of from 30 to 95%, comprising a thermomagnetic material selected from
(1) a compound of the general formula (I)
(AyBy−- 1)2+δ
CwDxEz
(I)where A is Mn or Co, B is Fe, Cr or Ni, C, D and E at least two of C, D and E are different, have a non-vanishing concentration and are selected from P, B, Se, Ge, Ga, Si, Sn, N, As and Sb, where at least one of C, D and E is Ge or Si, δ
is a number in the range from −
0.1 to 0.1,w, x, y, z are numbers in the range from 0 to 1, where w+x+z=1; (2) an La- and Fe-based compound of the general formulae (II) and/or (III) and/or (IV)
La(FexAl1−
x)13Hy or La(FexSi1−
x)13Hy
(II)where x is a number from 0.7 to 0.95, y is a number from 0 to 3;
La(FexAlyCoz)13 or La(FexSiyCoz)13
(III)where x is a number from 0.7 to 0.95, y is a number from 0.05 to 1−
x,z is a number from 0.005 to 0.5;
LaMnxFe2−
xGe
(IV)where x is a number from 1.7 to 1.95 and (3) a Heusler alloy of the MnTP type where T is a transition metal and P is a p-doping metal having an electron count per atom e/a in the range from 7 to 8.5, (4) a Gd- and Si-based compound of the general formula (V)
Gd5(SixGe1−
x)4
(V)where x is a number from 0.2 to 1, (5) an Fe2P-based compound, (6) a manganite of the perovskite type, (7) a compound which comprises a rare earth element and is of the general formulae (VI) and (VII)
Tb5(Si4−
xGex)
(VI)where x=0, 1, 2, 3, 4,
XTiGetm (VII)where X=Dy, Ho, Tm, (8) an Mn- and Sb- or As-based compound of the general formulae (VIII) and (IX)
Mn2−
xZxSb
(VIII)
Mn2ZxSb1−
x
(IX)where Z is Cr, Cu, Zn, Co, V, As, Ge, x is from 0.01 to 0.5, where Sb may be replaced by As when Z is not As, comprising introducing a powder of the thermomagnetic material into a polymeric binder, to produce a thermoplastic molding material, subjecting the thermoplastic molding material to shaping, removing the binder to produce a body and sintering the body, or coating the powder of the thermomagnetic material with a polymeric binder and subjecting said material to a shaping by pressing, optionally with heat treatment, or forming foam by vigorous beating, shaking, spraying, or stirring of the melt of the thermomagnetic material. - View Dependent Claims (6, 7, 8)
- 1)2+δ
Specification