CN105023688A - High-temperature-resistant rare earth bonded permanent magnet - Google Patents

Abstract

The invention discloses a high-temperature-resistant rare earth bonded permanent magnet, which is produced from the following raw materials in parts by weight: 105 to 120 of NdFeB magnetic powder, 2 to 4 of polyurethane, 0.2 to 0.4 of polystyrene, 0.2 to 0.4 of 1,2-benzoquinone, 0.3 to 0.5 of lithium titanate, 3 to 5 of silico-calcium slag, 1.3 to 1.5 of locust gum, 8 to 10 of water, 1 to 2 of potassium peroxodisulfate, 0.3 to 0.5 of polyvinyl alcohol, 0.5 to 1 of silane coupling agent KH570, 1 to 2 of sodium chloride, 0.2 to 0.4 of sodium silicate, 0.6 to 1.2 of sodium citrate, 1 to 2 of dioctyl phthalate, 1 to 2 of magnesium stearate, 0.4 to 0.9 of cyclohexanone, 1 to 2 of ethylene bis stearamide and 1 to 2 of graphene.

Description

A kind of high temperature resistant bonding rare-earth permanent magnet

Technical field

The present invention relates to field of rare-earth permanent magnetic, is exactly a kind of high temperature resistant bonding rare-earth permanent magnet.

Background technology

At present, the high performance permanent magnetic materials on market is rare-earth bond magnet mostly; So-called rare-earth bond magnet refers to and rare earth permanent-magnet powder is mixed into a certain proportion of binding agent and a kind of magnet made by certain processing technology, and its final form can be divided into rigidity rare-earth bond magnet and flexible rare-earth cementing magnet.

Summary of the invention

The object of the present invention is to provide a kind of high temperature resistant bonding rare-earth permanent magnet.

Above-mentioned purpose is realized by following scheme:

A kind of high temperature resistant bonding rare-earth permanent magnet, is characterized in that: it is obtained by the raw material of following weight parts:

NdFeB magnetic 105-120, polyurethane 2-4, polystyrene 0.2-0.4,1,2-benzoquinones 0.2-0.4, lithium titanate 0.3-0.5, silico-calcium slag 3-5, locust tree glue 1.3-1.5, water 8-10, potassium peroxydisulfate 1-2, polyvinyl alcohol 0.3-0.5, silane coupler KH570 0.5-1, sodium chloride 1-2, sodium metasilicate 0.2-0.4, natrium citricum 0.6-1.2, dioctyl phthalate 1-2, dolomol 1-2, cyclohexanone 0.4-0.9, ethylene group bis-stearamides 1-2, Graphene 1-2.

Described a kind of high temperature resistant bonding rare-earth permanent magnet, is characterized in that: preparation method comprises the following steps:

(1) by after locust tree glue, water, potassium peroxydisulfate, polyvinyl alcohol mixing, stir at 40-50 DEG C, then add lithium titanate, then in heated-air circulation oven dry about 14-18h under about 60-70 DEG C, obtain composite powder for subsequent use;

(2) silico-calcium slag stirs 2-5h in absolute ethyl alcohol, dry 4-6h at 50-70 DEG C, add cyclohexanone, ethylene group bis-stearamides, Graphene again, stir, after being pressed into base, at 700-730 DEG C, calcine 4-5 hour again, take out, cooling, be ground into 300-400 order powder, mix with composite powder, obtain nonmagnetic powder for subsequent use;

(3) NdFeB magnetic, nonmagnetic powder, polyurethane are uniformly mixed in helium, obtain mixture;

(4) in the mixture of step (3), add all the other raw materials except dolomol again, in muller, 150-160 DEG C mixes;

(5) the unity powder after mixing is carried out mechanical crushing;

(6) dolomol is added the powder that step (5) obtains, is pressed into High-density magnet, then solidify 40-80 minute at 120-160 DEG C after, cooling, after and get final product.

Beneficial effect of the present invention is: permanent magnet of the present invention, and the pliability of its its calendaring molding magnet is high, obtains resistant to elevated temperatures characteristic while saving magnetic, and the decay of its high temperature magnetic is slow, not easily becomes fragile.Graphene by after composite with all the other raw materials through a series of process, the magnet finally suppressed enough reaches good magnetic energy through adding magnetic energy, saves the consumption of rare earth.

Embodiment

A kind of high temperature resistant bonding rare-earth permanent magnet, it is obtained by the raw material of following weight (kg):

NdFeB magnetic 120, polyurethane 4, polystyrene 0.4,1,2-benzoquinones 0.4, lithium titanate 0.5, silico-calcium slag 3, locust tree glue 1.3, water 10, potassium peroxydisulfate 1, polyvinyl alcohol 0.5, silane coupler KH570 0.5, sodium chloride 1, sodium metasilicate 0.4, natrium citricum 0.6, dioctyl phthalate 1, dolomol 1, cyclohexanone 0.9, ethylene group bis-stearamides 1, Graphene 1.

Described a kind of high temperature resistant bonding rare-earth permanent magnet, preparation method comprises the following steps:

(1) by after locust tree glue, water, potassium peroxydisulfate, polyvinyl alcohol mixing, stir at 50 DEG C, then add lithium titanate, then in heated-air circulation oven dry 18h under about 70 DEG C, obtain composite powder for subsequent use;

(2) silico-calcium slag stirs 5h in absolute ethyl alcohol, dry 4h at 70 DEG C, add cyclohexanone, ethylene group bis-stearamides, Graphene again, stir, calcine 4 hours at 700 DEG C again after being pressed into base, take out, cooling, be ground into 300 order powder, mix with composite powder, obtain nonmagnetic powder for subsequent use;

(3) NdFeB magnetic, nonmagnetic powder, polyurethane are uniformly mixed in helium, obtain mixture;

(4) in the mixture of step (3), add all the other raw materials except dolomol again, in muller, 160 DEG C mix;

(5) the unity powder after mixing is carried out mechanical crushing;

(6) dolomol is added the powder that step (5) obtains, is pressed into High-density magnet, then solidify after 40 minutes at 120 DEG C, cooling, after and get final product.

Hot strength 5. 3MPa of gained magnet, and wet-hot aging performance is all good thus overcome the oxidizable problem of magnet, through the experiment of high temperature demagnetize, after 120 DEG C of insulation 1H, flux loss < 5%; Maximum magnetic energy product 8.7(MGOe).

Claims (2)

1. a high temperature resistant bonding rare-earth permanent magnet, is characterized in that: it is obtained by the raw material of following weight parts:

NdFeB magnetic 105-120, polyurethane 2-4, polystyrene 0.2-0.4,1,2-benzoquinones 0.2-0.4, lithium titanate 0.3-0.5, silico-calcium slag 3-5, locust tree glue 1.3-1.5, water 8-10, potassium peroxydisulfate 1-2, polyvinyl alcohol 0.3-0.5, silane coupler KH570 0.5-1, sodium chloride 1-2, sodium metasilicate 0.2-0.4, natrium citricum 0.6-1.2, dioctyl phthalate 1-2, dolomol 1-2, cyclohexanone 0.4-0.9, ethylene group bis-stearamides 1-2, Graphene 1-2.

2. a kind of high temperature resistant bonding rare-earth permanent magnet according to claim 1, is characterized in that: preparation method comprises the following steps:

After locust tree glue, water, potassium peroxydisulfate, polyvinyl alcohol mixing, stir at 40-50 DEG C, then add lithium titanate, then in heated-air circulation oven dry about 14-18h under about 60-70 DEG C, obtain composite powder for subsequent use;

(2) silico-calcium slag stirs 2-5h in absolute ethyl alcohol, dry 4-6h at 50-70 DEG C, add cyclohexanone, ethylene group bis-stearamides, Graphene again, stir, after being pressed into base, at 700-730 DEG C, calcine 4-5 hour again, take out, cooling, be ground into 300-400 order powder, mix with composite powder, obtain nonmagnetic powder for subsequent use;

(3) NdFeB magnetic, nonmagnetic powder, polyurethane are uniformly mixed in helium, obtain mixture;

(4) in the mixture of step (3), add all the other raw materials except dolomol again, in muller, 150-160 DEG C mixes;

(5) the unity powder after mixing is carried out mechanical crushing;

(6) dolomol is added the powder that step (5) obtains, is pressed into High-density magnet, then solidify 40-80 minute at 120-160 DEG C after, cooling, after and get final product.