NiMnGaSi alloy bonding magnet and preparation method thereof
A technology of bonded magnets and alloys, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of high frequency eddy current loss, difficult processing, high brittleness of NiMnGa materials, etc. Effect of application value, magneto-strain performance and mechanical properties enhancement
Inactive Publication Date: 2013-07-24
TAIZHOU UNIV
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Problems solved by technology
[0004] The purpose of the present invention is to solve the problems of high brittleness of cast polycrystalline NiMnGa materials, difficulty in processing into various complex shapes, high frequency eddy current loss, etc. powder, plus an appropriate amount of binder molded into shape) due to the external stress of ingot grinding, the magnetic strain performance and other performance indicators of NiMnGa materials are reduced, and a reduction diffusion method is invented to prepare NiMnGaSi alloy powder. Bonded NiMnGaSi alloy bonded magnet and its preparation method
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[0042] The preparation method of described NiMnGaSi alloy bonded magnet is:
[0043] (1) Raw materials and dosage
[0044] Raw material: Ni 2 o 3 Fenwei, Ga 2 o 3 Powder, Mn powder, Ca powder; SiO 2 Emulsion liquid; carry out batching according to following reaction equation:
[0045] 505Ni 2 o 3 +542Mn+221Ga 2 o 3 +6SiO2 2 +2190Ca=
[0046] 20Ni 50.5 mn 27.1 Ga 22.1 Si 0.3 +2190CaO
[0047] The actual Ca content is 1.2 times the above standard value
[0048] Taking the preparation of 1000 grams of NiMnGaSi alloy bonded magnet as the starting point of measurement, then
[0049] Ni 2 o 3 The dosage is 696.48 grams
[0050] Ga 2 o 3 The dosage is 345.40 grams
[0051] The amount of Mn used is 248.39 grams
[0052] The amount of Ca used is 878.26 grams
[0053] SiO 2 The dosage is 4.28 grams
[0054] The selected raw material, Ni 2 o 3 , Mn, Ga 2 o 3 The purity of the powder is above 99.9%, and the particle size is on the order of microns; SiO 2 The ...
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Abstract
The invention relates to a ferromagnetic shape memory alloy and a preparation method thereof, in particular to a NiMnGaSi alloy bonding magnet and a preparation method thereof. In the preparation method of the NiMnGaSi alloy bonding magnet, raw materials which are Ni2O3 powder, Ga2O3 powder, Mn powder, Ca powder and SiO2 latex solution are selected, and the NiMnGaSi alloy powder is obtained by reduction reaction and diffusion reaction; and the NiMnGaSi alloy powder is bonded into a whole to obtain the NiMnGaSi alloy bonding magnet. The magneto strain performance and the mechanical performanceof the NiMnGaSi alloy bonding magnet can be obviously improved; and the NiMnGaSi alloy bonding magnet is difficult to heat under the action of a high-frequency electromagnetic field, can be processedinto different seizes and shapes according to the requirement of workpieces, and has larger application value.
Description
technical field [0001] The invention relates to a ferromagnetic shape memory alloy and a preparation method thereof, in particular to a NiMnGaSi alloy bonded magnet and a preparation method thereof. Background technique [0002] NiMnGa series ferromagnetic shape memory alloy is a new type of intelligent material discovered in recent years. It has the characteristics of strong ferromagnetism, large magneto-induced strain, temperature control and magnetic control shape memory effect, and is expected to become a new generation of drive and sensor. materials with broad application prospects. Using a magnetic field to change the orientation of the martensite variant can produce a large magneto-induced strain. For example, S.J.Murray obtained a 6% magneto-induced strain in 2000, and A.Sozinoy obtained a 9.5% magneto-induced strain in 2002. However, these large magnetic strains generally occur in NiMnGa single crystals. Due to the complex preparation process of single crystal, hi...
Claims
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IPC IPC(8): H01F41/02H01F1/047H01F1/08B22F3/02
Inventor 蔡培阳冯尚申薛双喜周英陈卫平
Owner TAIZHOU UNIV