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METHOD FOR FABRICATING A FUNCTIONALLY-GRADED MONOLITHIC SINTERED WORKING COMPONENT FOR MAGNETIC HEAT EXCHANGE AND AN ARTICLE FOR MAGNETIC HEAT EXCHANGE

  • US 20130187077A1
  • Filed: 08/17/2011
  • Published: 07/25/2013
  • Est. Priority Date: 08/18/2010
  • Status: Active Grant
First Claim
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1. A method for fabricating a functionally-graded monolithic sintered working component for magnetic heat exchange, comprising:

  • providing powder comprising elements in amounts suitable to form a La1-aRa(Fe1-x-yTyMx)13HzCb phase with a NaZn13-type structure, wherein T is one or more of the elements from the group consisting of Mn, Co, Ni, Ti, V and Cr, M is one or more of the elements from the group consisting of Si and Al, and R is one or more of the elements from the group consisting of Ce, Nd, Y and Pr,forming the powder to provide a green body in which the amount of the one or more elements T and R, if present, the amount of C, if present, and the amount of M varies in a pre-determined direction of the green body,heat treating the green body at a temperature T and for a time t selected to allow diffusion of one or more of the elements T, R and C, andforming a working component comprising a functionally-graded Curie temperature that monotonically increases or monotonically decreases in the predetermined direction.

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