Method for preparing magnetic heat material Mn-Ni-Ge:Fe-based series alloy bar through electric arc melting and copper mold spray casting

Abstract

The invention discloses a method for preparing a magnetic heat material Mn-Ni-Ge:Fe-based series alloy bar through electric arc melting and copper mold spray casting. The method comprises the specific steps that burdening is conducted, wherein the masses of needed metal simple substances of Mn, Ni, Fe, Ge and the like are calculated according to the stoichiometric ratio, and MnNi1 xFexGe and Mn1 xFexNiGe are adopted as the composition proportion; electric arc melting is conducted, wherein the burdened raw materials are put into a water cooling type copper crucible, argon is back charged into the vacuum environment to conduct electric arc melting, and an Mn-Ni-Ge:Fe-based alloy ingot is obtained; copper mold spray casting is conducted, wherein the Mn-Ni-Ge:Fe-based alloy ingot is sheared and loaded into a quarts tube with the inner diameter being 10 mm, the ingot in the quarts tube is melted through a high-frequency induction heating device, a melted sample is sprayed to a copper mold with water cooling through a small hole in the bottom of the quarts tube through nitrogen pressurizing, and the alloy bar is obtained; and heat treatment is conducted, wherein a part of the bar sample is taken and sealed in the quarts tube, annealing heat treatment is conducted in a high-temperature furnace, and a part of the bar sample is put into cold water to be quenched or cooled to the room temperature along with the furnace. The preparing method is simple and convenient to implement and is used for easily preparing bars in regular shapes to serve as magnetic refrigerating materials, and the preparing cost and the energy consumption are reduced.

Description

technical field [0001] The present invention relates to the preparation and property research of Mn-Ni-Ge: Fe-based series alloy rods, in particular to a novel room-temperature magnetocaloric material Mn-Ni-Ge: Fe-based series alloy prepared by arc melting and copper mold spray casting Rod method. Background technique [0002] The magnetic refrigeration technology based on the magnetocaloric effect is known as a refrigeration technology most likely to replace today's gas compression refrigeration due to its advantages of high efficiency, environmental protection, energy saving, small size and reliable operation. field, large entropy change, and small hysteresis. For secondary magnetic phase change materials, although there is no problem of thermal hysteresis and magnetic hysteresis, the small magnetocaloric effect limits its practical application; Although variable materials have a large magnetocaloric effect, the inevitable thermal hysteresis and hysteresis loss are the bo...

AI Technical Summary

Problems solved by technology

Mn-Ni-Ge:Fe-based series alloys are room temperature magnetic refrigeration materials with certain development potential studied in recent years, but according to the existing research results, it is found that the Mn-Ni-Ge:Fe-based series alloy samples currently under research There are the following problems: (1) Most of the current research focuses on the block and thin strip, but there are few reports on the rod; (2) For the block to obtain a homogeneous single-phase sample, the required The annealing time is very long, and it usually takes 4-5 days to form a phase, which greatly increases the cost

Images