Near-room-temperature magnetic refrigeration manganese-germanium-based refrigeration material and preparation method thereof
A magnetic refrigeration and room temperature technology, which is applied in the direction of magnetic materials, inorganic materials, magnetic objects, etc., can solve the problem of unsatisfactory magnetocaloric effect, achieve the optimization of Curie temperature and magnetocaloric effect, avoid thermal hysteresis, and low price Effect
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[0034] The purity of the experimental raw materials used is 99.9% Mn, 99.99% Ge, 99.99% Ti, and the alloy is smelted in a vacuum electric arc furnace. Specifically, before the alloy is smelted, the Mn 5 Ge 3-x Ti x (x is respectively 0.5, 1) metering ratio Weigh the reaction raw material and put it into the electric arc furnace, then the furnace is evacuated so that the vacuum degree is lower than 10 -3 Pa, then pass high-purity argon gas (99.999%) to the pressure of about 10Pa, repeat the above vacuuming and washing operation steps 3 times, use a current of about 30A to start a fire, move the electrode to the top of the sample and adjust the current to 70A Left and right until the sample is completely melted, then reduce the current to 50A for half a minute, wait for the alloy to cool and turn it over, and repeat the melting 4 times to ensure the uniformity of the sample. Take out the cooled sample and put it into a high-temperature quartz glass test tube in a vacuum anneal...
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