| 简介 |
A method for manufacturing a magnetocaloric element comprising the following steps : - a powder of a magnetocaloric alloy is prepared, with the composition : La1-x(Ce, Pr)x(Fe1-z-vMnzCov)1-ySiy)wXn wherein : - X is one or more elements chosen from among H, C, N and B; - x = 0 to 0.5; - y = 0.05 to 0.2; - z = 0 to 0.15; - v = 0 to 0.15; - w = 12 to 16; - n = 0 to 3.5; the rest being impurities, with a maximum content of 4% by weight, preferably a maximum content of 2% by weight, of rare earth elements other than La, Ce and Pr, and a maximum content of 2% by weight for the other impurities, the preparation of the powder comprising the following steps : - a liquid alloy (4) is prepared; - it is solidified in the form of a powder of substantially spherical particles (14) of which the average diameter is between 10 and 100 mm by atomisation of a jet (8) using an inert gas; - said powder (14) is thermally treated by heating to a temperature of 900 to 1200°so that at least 70% thereof by weight has an NaZn13 structure; - optionally a hydriding and/or nitriding and/or carburising and/or carbonitriding treatment is performed to give n its final value; said powder (14) is dispersed in a matrix formed by one or more organic binders in order to form a mixture comprising 40 to 80% powder by volume; - said mixture is shaped. |
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