Method for manufacturing Mn-Co(Ni)-Ge-based alloy ribbon through electric arc melting and quick melt quenching

Abstract

Provided is a method for manufacturing a Mn-Co(Ni)-Ge-based alloy ribbon through electric arc melting and quick melt quenching. The method comprises the steps that (1), dosing is carried out, wherein the mass of needed metal elements such as Mn, Co(Ni), and Ge is calculated according to the stoichiometric ratio and then dosing is carried out; (2), electric arc melting is carried out, wherein well prepared raw materials are put into a water-cooled copper crucible electric arc furnace, the vacuum is pumped to below 3-10Pa, the furnace is filled with argon, then electric arc melting is carried out, and the process is carried out 3-4 times; (3), rapid melt quenching is carried out, wherein a Mn-Co(Ni)-Ge-based alloy cast ingot is installed into a quartz tube of the inner diameter being 10mm and then is placed into a rapid quenching furnace chamber, the vacuum inside the furnace chamber is pumped to be 4-10Pa, then argon is introduced, the cast ingot is melted to be in a liquid state in a high-frequency induction heating mode, then the liquid is sprayed to a copper roller through small holes in the bottom of the quartz tube, the copper roller rotates at a high speed, and then a rapidly quenched ribbon is obtained; (4), homogenizing treatment is carried out, wherein a ribbon sample is sealed in the quartz tube, annealing thermal treatment is carried out inside a high temperature furnace, and then the ribbon sample is placed into cold water and is quenched. The manufacturing method is simple and convenient to implement. By means of the method, the annealing processing time is greatly shortened or even avoided, the manufacturing cost is lowered, and the consumption of energy sources is reduced.

Description

technical field [0001] The invention relates to the preparation and property research of MnCo(Ni)Ge-based alloy thin strips, in particular to a method for preparing novel magnetic-caloric material MnCo(Ni)Ge-based alloy thin strips through arc melting and rapid quenching of melts. Background technique [0002] Refrigeration technology, especially the refrigeration technology near room temperature, is of great significance in industrial and agricultural production, people's daily life, aerospace environment simulation, national defense and scientific research and other important fields related to the national economy and people's livelihood. Compared with traditional gas compression refrigeration, magnetic refrigeration technology based on magnetocaloric effect has the advantages of high efficiency, environmental protection, energy saving, small size and reliable operation. The key technology of magnetic refrigeration is to find a magnetic refrigerant with excellent performan...

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Problems solved by technology

However, according to the existing research results, it is found that the MnCo(Ni)Ge-based alloys currently under research are almost all bulk samples prepared by traditional arc melting or induction melting methods. These bulk samples have the following problems: (1) To obtain a homogeneous single-phase sample, it is necessary to go through a long-term high-temperature annealing treatment, which usually takes several days, and the sample preparation cost is high; (2) The large thermal hysteresis is between 10-20 K, or even higher. (3) Thermal-magnetic stability is poor, and obvious "powdering" phenomenon appears after several magnetic / thermal cycles

But for MnCo(Ni)Ge-based alloys, there are almost no thin ribbon samples reported so far, let alone the first-order magnetic structural phase transition observed in thin ribbon samples.

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