CN107140966B - A kind of permanent-magnet ferrite sintered magnet injection moulding particle material and its preparation and application - Google Patents
A kind of permanent-magnet ferrite sintered magnet injection moulding particle material and its preparation and application Download PDFInfo
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- CN107140966B CN107140966B CN201710363870.9A CN201710363870A CN107140966B CN 107140966 B CN107140966 B CN 107140966B CN 201710363870 A CN201710363870 A CN 201710363870A CN 107140966 B CN107140966 B CN 107140966B
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Abstract
The present invention discloses a kind of permanent-magnet ferrite injection moulding particle material and preparation method thereof, strontium ferrite powder is mixed with high density polyethylene (HDPE), modified waxes matrix, surface modifier and plasticizer, double screw extruder progress extruding pelletization is added in the material mixed again and is prepared into feeding, it is injection moulded again and is prepared into green compact, degreased blank is made after the two step degreasing of solvent-heat after, finally carries out high temperature sintering and sintering permanent magnet ferrite magnetic device is made.Due to using novel modified waxes matrix, gained particulate material has excellent mobility and conformality, while improving the defects of moulding solvent degreasing is bent in the process, deforms, and degreasing efficiency is high.
Description
Technical field
The present invention relates to ceramic powders to be injection moulded field, especially a kind of permanent-magnet ferrite sintered magnet injection moulding
Pellet and its preparation and application.
Background technique
Ceramic powders injection molding technology is a kind of combination traditional polymer injection molding technology and PM technique
Forming method, the great potential with near-net-shape production components, its advantage lies in being able to high efficiency and manufactures shape in large quantity
Shape complexity, high precision, high performance miniature precision components, thus obtain the more and more extensive concern of people.Currently, due to
The miniaturization of electronic equipment and have increasing need for small-sized and complicated components, the ferrimagnetism device of some complexity at
Function is manufactured with powder injection molding technology.
Ceramic powders injection molding technology includes mixing, molding, degreasing and sintering four-stage, the production work in each stage
Skill depends on using which type of binder system.In powder injection-molded production technology, binder formula and degreasers
Skill plays very important role, and wherein powder must uniformly be coated and it is made to obtain ideal shape by binder, then
The defects of must removing before sintering and idiosome is made not generate bending deformation.Therefore, most of binder system is usually designed to
For multicomponent system.
Ceramic powders are injection moulded used binder system and generally comprise polyethylene, wax, stearic acid etc. at present, specifically
Composition and content are had nothing in common with each other, and correspondingly, degreasing process is usually two step degreasing method of solvent degreasing-thermal debinding.However
Easily occur binder-powder separation, powder reunion, initial hole deficiency etc. during solvent degreasing and lead to green body bending deformation
The defects of.
In disclosed Chinese patent literature, it is seen that about the technical information of adhesive for powder injection forming, typically
" a kind of adhesive for powder injection forming and its preparation side recommended such as invention patent mandate publication No. CN 104761263A
Method ", the binder are composed of the following components by weight percentage: polyethylene glycol 60%-80%, polymethyl methacrylate
10%-35%, stearic acid 1%-10%.Organic matter is removed using siphon thermal debinding process.Such as invention patent mandate publication No. CN
" a kind of aluminium nitride ceramics injection moulding binder and the application method " that 104860684A recommends, the binder composition is such as
Under: microwax 50%-70%, high polymer 25%-40%, surface modifier 3%-10%, resin 2%-12%.Used powder
End is aluminium nitride, using kerosene degreasing and thermal debinding." the one kind recommended such as invention patent mandate publication No. CN 103911100A
Powder injection-molded polyformaldehyde based binder and preparation method thereof ", the binder is by mass percentage by following components group
At: copolymerized methanal 80%-89.5%, high impact polystyrene 4%-10%, compatilizer 1%-2.5%, paraffin 5%-11% resist
Oxidant 0.5%-1%.Above system is mostly basic component with paraffin, although being conducive to blending extrusion and injection moulding, so
Afterwards, it tends to that the defects of polymer is reunited, powder separates, bending deformation occurs in subsequent skimming processes.
Summary of the invention
The purpose of the present invention is to provide a kind of using modified waxes matrix as the novel binders system of main component, the bonding
Paraffin refined wax system binder is compared in agent, has processing fluidity good, dispersing uniformity is good in a binder for powder, can especially improve
Green body the defects of bending deformation, improves degreasing efficiency during solvent degreasing.One kind binder system and strontium are proposed simultaneously
The compound application method of ferrite powder prepares the injection moulding particle material for being suitble to permanent-magnet ferrite sintering.
The invention adopts the following technical scheme:
A kind of permanent-magnet ferrite sintered magnet injection moulding particle material, it is characterised in that the permanent-magnet ferrite sintered magnet
Injection moulding particle material is made of following components by percent by volume:
The modified waxes matrix is the mixture that Brazil wax, polyamide wax and microwax are constituted, based on described
Modified waxes matrix each component is formed by following volumes percentage:
Brazil wax 50-70vol.%
Polyamide wax 25-40vol.%
Microwax 5-10vol.%
The surface modifier is stearic acid；The plasticizer is dibutyl sebacate.
Further, ferromagnetic oxide powder of the present invention is strontium ferrite magnetic powder.
Further, ferrite magnetic granularity of the present invention is 0.5-1 microns.
Further, permanent-magnet ferrite sintered magnet injection moulding particle material of the present invention preferably presses body by following components
Modified waxes matrix matrix accounts for 22vol.% to product percentage composition, ferromagnetic oxide powder accounts for 55vol.%, high density polyethylene (HDPE) accounts for
18vol.%, stearic acid account for 3.5vol.%, dibutyl sebacate accounts for 1.5vol.%；Wherein the modified waxes matrix is based on institute
The modification cerul stated is made of following components by percent by volume: 65vol.% Brazil wax, 30vol.% polyamide wax,
5vol.% microwax constitutes modified waxes matrix.
Further, the present invention provides the preparation side of permanent-magnet ferrite sintered magnet injection moulding particle material described in one kind
Method, the method sequentially include the following steps:
(1) by Brazil wax, polyamide wax and microwax by the percent by volume composition mixing, 80-100 DEG C it
Between be kneaded be made modified waxes matrix；
(2) high-density polyethylene is taken by the percent by volume of the permanent-magnet ferrite sintered magnet injection moulding particle material component
Alkene, modified waxes matrix, surface modifier are uniformly mixed with ferromagnetic oxide powder, are then passed through feeder and are entered double screw extruder,
Extruding pelletization obtains mixed feed, as the permanent-magnet ferrite sintered magnet injection moulding particle material；Screw speed is 15-
25rad/s, feeder revolving speed are 15-20rad/s, and extruder temperature is 130-140 DEG C.
In addition, the present invention also provides the permanent-magnet ferrite sintered magnet injection moulding particle materials described in one kind to prepare permanent magnetism
The application of ferrite sintered magnet.
Further, the application method specifically:
Magnetic ferrites sintered magnet injection moulding particle material obtained is injection moulded on injection (mo(u)lding) machine, is obtained
The green body of sintered magnet, injection molding temperature are 130-150 DEG C；Then, the green body of sintered magnet two step of solvent-heat is carried out to take off
Rouge, the first step carry out solvent degreasing 5-8h in 45-55 DEG C of normal heptane reagent, and solvent degreasing part is put into batch-type furnace by second step
Interior, control in-furnace temperature is warming up to 600-650 DEG C from room temperature with the heating rate of 1.5-5 DEG C/min, completes thermal debinding；Finally,
Green body after degreasing is put into Muffle furnace, through 1250-1300 DEG C of sintering 2-4h, obtains permanent-magnet ferrite sintered magnet.
Beneficial effects of the present invention: the modified waxes matrix component that uses in the present invention, compared to paraffin refined wax binder system,
With lower viscosity, this improves processing flowabilities, while it is equal to improve dispersion of the cerul body in high density polyethylene (HDPE)
Even property then improves strontium ferrite powder dispersing uniformity in a binder, so as to improve green body during solvent degreasing
The defects of bending deformation.
Detailed description of the invention
Fig. 1: 4 sample of the embodiment photo before degreasing, after solvent degreasing and after thermal debinding respectively.
Fig. 2-11: the sintered cross-section morphology figure of embodiment 1-10 sample.
Specific embodiment
The present invention is described further combined with specific embodiments below, but protection scope of the present invention is not limited in
This.
Embodiment 1
Each constituent element of particulate material and volume fraction are as follows:
Wherein: modified waxes matrix each component volume fraction is as follows:
Brazil wax 70%
Polyamide wax 25%
Microwax 5%
According to the above formula, by Brazil wax (8015-86-9), polyamide wax (NEW-0404) and microwax (No. 80)
It is kneaded at 100 DEG C and modified waxes blapharoplast is made；By the high density polyethylene (HDPE) centainly matched (8050), modified waxes matrix, tristearin
Sour (57-11-4) is uniformly mixed with strontium ferrite powder, and then extruding pelletization obtains mixed feed, spiral shell in double screw extruder
Bar revolving speed is 20rad/s, and feeder revolving speed is 16rad/s, extruder temperature be followed successively by 130 from feed inlet to discharge port,
130,135,140,140℃.Particulate material obtained is injection moulded on injection (mo(u)lding) machine, obtains the injection of sintered magnet
Molding blank.Injection molding temperature is followed successively by 130,145,150 DEG C from top to bottom.Then, injection molding green body is subjected to solvent-
Hot two step degreasings, the first step carry out solvent degreasing 6h in 50 DEG C of normal heptane reagent, and solvent degreasing part is put into case by second step
In formula furnace, control in-furnace temperature is warming up to 600 DEG C from room temperature with the heating rate of 1.5 DEG C/min, completes thermal debinding.Finally, will
Green body after degreasing is put into Muffle furnace, through 1300 DEG C of sintering 2h, obtains permanent-magnet ferrite sintered magnet.Inject the green body come
Any surface finish, of uniform size, without obvious bending deformation after solvent degreasing, then after thermal debinding, degreasing rate can reach 98.7%, burn
Sample section compact structure after knot.
Embodiment 2
Each constituent element of particulate material and volume fraction are as follows:
Wherein: modified waxes matrix each component volume fraction is as follows:
Brazil wax 70%
Polyamide wax 25%
Microwax 5%
According to the above formula, by Brazil wax (8015-86-9), polyamide wax (NEW-0404) and microwax (No. 80)
It is kneaded at 100 DEG C and modified waxes blapharoplast is made；By the high density polyethylene (HDPE) centainly matched (8050), modified waxes matrix, tristearin
Sour (57-11-4) is uniformly mixed with strontium ferrite powder, and then extruding pelletization obtains mixed feed, spiral shell in double screw extruder
Bar revolving speed is 20rad/s, and feeder revolving speed is 16rad/s, extruder temperature is followed successively by 130 from feed inlet to discharge port, 130,
135,140,140℃.Particulate material obtained is injection moulded on injection (mo(u)lding) machine, obtains the injection moulding of sintered magnet
Green body.Injection molding temperature is followed successively by 130,145,150 DEG C from top to bottom.Then, injection molding green body is subjected to solvent-heat two
Degreasing is walked, the first step carries out solvent degreasing 6h in 50 DEG C of normal heptane reagent, and solvent degreasing part is put into batch-type furnace by second step
Interior, control in-furnace temperature is warming up to 600 DEG C from room temperature with the heating rate of 5 DEG C/min, completes thermal debinding.Finally, by after degreasing
Green body be put into Muffle furnace, through 1300 DEG C of sintering 2h, obtain permanent-magnet ferrite sintered magnet.Inject the billet surface light come
Clean, of uniform size, without obvious bending deformation after solvent degreasing, then after thermal debinding, degreasing rate can reach 98.9%, sintered
Sample section compact structure.
Embodiment 3
Each constituent element of particulate material and volume fraction are as follows:
Wherein: modified waxes matrix each component volume fraction is as follows:
Brazil wax 70%
Polyamide wax 25%
Microwax 5%
According to the above formula, by Brazil wax (8015-86-9), polyamide wax (NEW-0404) and microwax (No. 80)
It is kneaded at 100 DEG C and modified waxes blapharoplast is made；By the high density polyethylene (HDPE) centainly matched (8050), modified waxes matrix, tristearin
Sour (57-11-4) is uniformly mixed with strontium ferrite powder, and then extruding pelletization obtains mixed feed, spiral shell in double screw extruder
Bar revolving speed is 20rad/s, and feeder revolving speed is 16rad/s, extruder temperature is followed successively by 130 from feed inlet to discharge port, 130,
135,140,140℃.Particulate material obtained is injection moulded on injection (mo(u)lding) machine, obtains the injection moulding of sintered magnet
Green body.Injection molding temperature is followed successively by 130,145,150 DEG C from top to bottom.Then, injection molding green body is subjected to solvent-heat two
Degreasing is walked, the first step carries out solvent degreasing 6h in 50 DEG C of normal heptane reagent, and solvent degreasing part is put into batch-type furnace by second step
Interior, control in-furnace temperature is warming up to 650 DEG C from room temperature with the heating rate of 3 DEG C/min, completes thermal debinding.Finally, by after degreasing
Green body be put into Muffle furnace, through 1300 DEG C of sintering 2h, obtain permanent-magnet ferrite sintered magnet.Inject the billet surface light come
Clean, of uniform size, without obvious bending deformation after solvent degreasing, then after thermal debinding, degreasing rate can reach 99.2%, sintered
Sample section compact structure.
Embodiment 4
Each constituent element of particulate material and volume fraction are as follows:
Wherein: modified waxes matrix each component volume fraction is as follows:
Brazil wax 65%
Polyamide wax 30%
Microwax 5%
According to the above formula, by Brazil wax (8015-86-9), polyamide wax (NEW-0404) and microwax (No. 80)
It is kneaded at 100 DEG C and modified waxes blapharoplast is made；By the high density polyethylene (HDPE) centainly matched (8050), modified waxes matrix, tristearin
Sour (57-11-4) is uniformly mixed with strontium ferrite powder, and then extruding pelletization obtains mixed feed, spiral shell in double screw extruder
Bar revolving speed is 20rad/s, and feeder revolving speed is 16rad/s, extruder temperature is followed successively by 130 from feed inlet to discharge port, 130,
135,140,140℃.Particulate material obtained is injection moulded on injection (mo(u)lding) machine, obtains the injection moulding of sintered magnet
Green body.Injection molding temperature is followed successively by 130,145,150 DEG C from top to bottom.Then, injection molding green body is subjected to solvent-heat two
Degreasing is walked, the first step carries out solvent degreasing 6h in 50 DEG C of normal heptane reagent, and solvent degreasing part is put into batch-type furnace by second step
Interior, control in-furnace temperature is warming up to 600 DEG C from room temperature with the heating rate of 1.5 DEG C/min, completes thermal debinding.Finally, by degreasing
Green body afterwards is put into Muffle furnace, through 1300 DEG C of sintering 2h, obtains permanent-magnet ferrite sintered magnet.Inject the billet surface come
Bright and clean, of uniform size, without obvious bending deformation after solvent degreasing, then after thermal debinding, degreasing rate can reach 99.8%, after sintering
Sample section compact structure.4 sample of the embodiment such as Fig. 1 of the photo before degreasing, after solvent degreasing and after thermal debinding institute respectively
Show.
Embodiment 5
Each constituent element of particulate material and volume fraction are as follows:
Wherein: modified waxes matrix each component volume fraction is as follows:
Brazil wax 50%
Polyamide wax 40%
Microwax 10%
According to the above formula, by Brazil wax (8015-86-9), polyamide wax (NEW-0404) and microwax (No. 80)
It is kneaded at 100 DEG C and modified waxes blapharoplast is made；By the high density polyethylene (HDPE) centainly matched (8050), modified waxes matrix, tristearin
Sour (57-11-4) is uniformly mixed with strontium ferrite powder, and then extruding pelletization obtains mixed feed, spiral shell in double screw extruder
Bar revolving speed is 20rad/s, and feeder revolving speed is 16rad/s, extruder temperature is followed successively by 130 from feed inlet to discharge port, 130,
135,140,140℃.Particulate material obtained is injection moulded on injection (mo(u)lding) machine, obtains the injection moulding of sintered magnet
Green body.Injection molding temperature is followed successively by 130,145,150 DEG C from top to bottom.Then, injection molding green body is subjected to solvent-heat two
Degreasing is walked, the first step carries out solvent degreasing 6h in 50 DEG C of normal heptane reagent, and solvent degreasing part is put into batch-type furnace by second step
Interior, control in-furnace temperature is warming up to 600 DEG C from room temperature with the heating rate of 5 DEG C/min, completes thermal debinding.Finally, by after degreasing
Green body be put into Muffle furnace, through 1300 DEG C of sintering 2h, obtain permanent-magnet ferrite sintered magnet.Inject the billet surface light come
Clean, of uniform size, without obvious bending deformation after solvent degreasing, then after thermal debinding, degreasing rate can reach 99.5%, sintered
Sample section compact structure.
Embodiment 6
Each constituent element of particulate material and volume fraction are as follows:
Wherein: modified waxes matrix each component volume fraction is as follows:
Brazil wax 50%
Polyamide wax 40%
Microwax 10%
According to the above formula, by Brazil wax (8015-86-9), polyamide wax (NEW-0404) and microwax (No. 80)
It is kneaded at 100 DEG C and modified waxes blapharoplast is made；By the high density polyethylene (HDPE) centainly matched (8050), modified waxes matrix, tristearin
Sour (57-11-4) is uniformly mixed with strontium ferrite powder, and then extruding pelletization obtains mixed feed, spiral shell in double screw extruder
Bar revolving speed is 20rad/s, and feeder revolving speed is 16rad/s, extruder temperature is followed successively by 130 from feed inlet to discharge port, 130,
135,140,140℃.Particulate material obtained is injection moulded on injection (mo(u)lding) machine, obtains the injection moulding of sintered magnet
Green body.Injection molding temperature is followed successively by 130,145,150 DEG C from top to bottom.Then, injection molding green body is subjected to solvent-heat two
Degreasing is walked, the first step carries out solvent degreasing 6h in 50 DEG C of normal heptane reagent, and solvent degreasing part is put into batch-type furnace by second step
Interior, control in-furnace temperature is warming up to 600 DEG C from room temperature with the heating rate of 5 DEG C/min, completes thermal debinding.Finally, by after degreasing
Green body be put into Muffle furnace, through 1300 DEG C of sintering 2h, obtain permanent-magnet ferrite sintered magnet.Inject the billet surface light come
Clean, of uniform size, without obvious bending deformation after solvent degreasing, then after thermal debinding, degreasing rate can reach 99.6%, sintered
Sample section compact structure.
Embodiment 7
Each constituent element of particulate material and volume fraction are as follows:
Wherein: modified waxes matrix each component volume fraction is as follows:
Brazil wax 50%
Polyamide wax 40%
Microwax 10%
According to the above formula, by Brazil wax (8015-86-9), polyamide wax (NEW-0404) and microwax (No. 80)
It is kneaded at 100 DEG C and modified waxes blapharoplast is made；By the high density polyethylene (HDPE) centainly matched (8050), modified waxes matrix, tristearin
Sour (57-11-4) is uniformly mixed with strontium ferrite powder, and then extruding pelletization obtains mixed feed, spiral shell in double screw extruder
Bar revolving speed is 20rad/s, and feeder revolving speed is 16rad/s, extruder temperature is followed successively by 130 from feed inlet to discharge port, 130,
135,140,140℃.Particulate material obtained is injection moulded on injection (mo(u)lding) machine, obtains the injection moulding of sintered magnet
Green body.Injection molding temperature is followed successively by 130,145,150 DEG C from top to bottom.Then, injection molding green body is subjected to solvent-heat two
Degreasing is walked, the first step carries out solvent degreasing 6h in 50 DEG C of normal heptane reagent, and solvent degreasing part is put into batch-type furnace by second step
Interior, control in-furnace temperature is warming up to 600 DEG C from room temperature with the heating rate of 1.5 DEG C/min, completes thermal debinding.Finally, by degreasing
Green body afterwards is put into Muffle furnace, through 1300 DEG C of sintering 2h, obtains permanent-magnet ferrite sintered magnet.Inject the billet surface come
Bright and clean, of uniform size, without obvious bending deformation after solvent degreasing, then after thermal debinding, degreasing rate can reach 99.3%, after sintering
Sample section compact structure.
Embodiment 8
Each constituent element of particulate material and volume fraction are as follows:
Wherein: modified waxes matrix each component volume fraction is as follows:
Brazil wax 65%
Polyamide wax 30%
Microwax 5%
According to the above formula, by Brazil wax (8015-86-9), polyamide wax (NEW-0404) and microwax (No. 80)
It is kneaded at 100 DEG C and modified waxes blapharoplast is made；By the high density polyethylene (HDPE) centainly matched (8050), modified waxes matrix, tristearin
Sour (57-11-4) is uniformly mixed with strontium ferrite powder, and then extruding pelletization obtains mixed feed, spiral shell in double screw extruder
Bar revolving speed is 20rad/s, and feeder revolving speed is 20rad/s, extruder temperature is followed successively by 130 from feed inlet to discharge port, 130,
135,140,140℃.Particulate material obtained is injection moulded on injection (mo(u)lding) machine, obtains the injection moulding of sintered magnet
Green body.Injection molding temperature is followed successively by 130,145,150 DEG C from top to bottom.Then, injection molding green body is subjected to solvent-heat two
Degreasing is walked, the first step carries out solvent degreasing 8h in 45 DEG C of normal heptane reagent, and solvent degreasing part is put into batch-type furnace by second step
Interior, control in-furnace temperature is warming up to 650 DEG C from room temperature with the heating rate of 1.5 DEG C/min, completes thermal debinding.Finally, by degreasing
Green body afterwards is put into Muffle furnace, through 1250 DEG C of sintering 2h, obtains permanent-magnet ferrite sintered magnet.Inject the billet surface come
Bright and clean, of uniform size, without obvious bending deformation after solvent degreasing, then after thermal debinding, degreasing rate can reach 98.2%, after sintering
Sample section compact structure.
Embodiment 9
Each constituent element of particulate material and volume fraction are as follows:
Wherein: modified waxes matrix each component volume fraction is as follows:
Brazil wax 65%
Polyamide wax 30%
Microwax 5%
According to the above formula, by Brazil wax (8015-86-9), polyamide wax (NEW-0404) and microwax (No. 80)
It is kneaded at 100 DEG C and modified waxes blapharoplast is made；By the high density polyethylene (HDPE) centainly matched (8050), modified waxes matrix, tristearin
Sour (57-11-4) is uniformly mixed with strontium ferrite powder, and then extruding pelletization obtains mixed feed, spiral shell in double screw extruder
Bar revolving speed is 15rad/s, and feeder revolving speed is 15rad/s, extruder temperature is followed successively by 130 from feed inlet to discharge port, 130,
135,140,140℃.Particulate material obtained is injection moulded on injection (mo(u)lding) machine, obtains the injection moulding of sintered magnet
Green body.Injection molding temperature is followed successively by 130,145,150 DEG C from top to bottom.Then, injection molding green body is subjected to solvent-heat two
Degreasing is walked, the first step carries out solvent degreasing 5h in 55 DEG C of normal heptane reagent, and solvent degreasing part is put into batch-type furnace by second step
Interior, control in-furnace temperature is warming up to 650 DEG C from room temperature with the heating rate of 1.5 DEG C/min, completes thermal debinding.Finally, by degreasing
Green body afterwards is put into Muffle furnace, through 1250 DEG C of sintering 2h, obtains permanent-magnet ferrite sintered magnet.Inject the billet surface come
Bright and clean, of uniform size, without obvious bending deformation after solvent degreasing, then after thermal debinding, degreasing rate can reach 98.9%, after sintering
Sample section compact structure.
Embodiment 10
Each constituent element of particulate material and volume fraction are as follows:
Wherein: modified waxes matrix each component volume fraction is as follows:
Brazil wax 65%
Polyamide wax 30%
Microwax 5%
According to the above formula, by Brazil wax (8015-86-9), polyamide wax (NEW-0404) and microwax (No. 80)
It is kneaded at 80 DEG C and modified waxes blapharoplast is made；By the high density polyethylene (HDPE) centainly matched (8050), modified waxes matrix, stearic acid
(57-11-4) is uniformly mixed with strontium ferrite powder, and then extruding pelletization obtains mixed feed, screw rod in double screw extruder
Revolving speed is 25rad/s, and feeder revolving speed is 15rad/s, extruder temperature is followed successively by 130 from feed inlet to discharge port, 130,
135,140,140℃.Particulate material obtained is injection moulded on injection (mo(u)lding) machine, obtains the injection moulding of sintered magnet
Green body.Injection molding temperature is followed successively by 130,145,150 DEG C from top to bottom.Then, injection molding green body is subjected to solvent-heat two
Degreasing is walked, the first step carries out solvent degreasing 5h in 55 DEG C of normal heptane reagent, and solvent degreasing part is put into batch-type furnace by second step
Interior, control in-furnace temperature is warming up to 650 DEG C from room temperature with the heating rate of 1.5 DEG C/min, completes thermal debinding.Finally, by degreasing
Green body afterwards is put into Muffle furnace, through 1300 DEG C of sintering 4h, obtains permanent-magnet ferrite sintered magnet.Inject the billet surface come
Bright and clean, of uniform size, without obvious bending deformation after solvent degreasing, then after thermal debinding, degreasing rate can reach 98.9%, after sintering
Sample section compact structure.
Fig. 2-11 respectively illustrates the section structure of the obtained sintered sample of embodiment 1-10, can from figure
Out, these samples have similar section microstructure, and sample densified sintering product has micro hole of holding one's breath to remain in the sample, this
It is comparatively fast related with grain growth.
Claims (6)
1. a kind of permanent-magnet ferrite sintered magnet injection moulding particle material, it is characterised in that the permanent-magnet ferrite sintered magnet note
It penetrates shaped granule material and is made of following components by percent by volume:
The modified waxes matrix is the mixture that Brazil wax, polyamide wax and microwax are constituted, based on the modification
Cerul body each component is formed by following volumes percentage:
Brazil wax 50-70vol.%
Polyamide wax 25-40vol.%
Microwax 5-10vol.%
The surface modifier is stearic acid；The plasticizer is dibutyl sebacate.
2. permanent-magnet ferrite sintered magnet injection moulding particle material as described in claim 1, it is characterised in that: the ferrite
Magnetic powder is strontium ferrite magnetic powder.
3. permanent-magnet ferrite sintered magnet injection moulding particle material as described in claim 1, it is characterised in that: the ferrite
Magnetic granularity is 0.5-1 microns.
4. permanent-magnet ferrite sintered magnet injection moulding particle material as described in claim 1, it is characterised in that the permanent magnetism
Ferrite sintered magnet injection moulding particle material is made of following components by percent by volume: modified waxes matrix account for 22vol.%,
Ferromagnetic oxide powder accounts for 55vol.%, high density polyethylene (HDPE) accounts for 18vol.%, stearic acid accounts for 3.5vol.%, dibutyl sebacate accounts for
1.5vol.%；Wherein the modified waxes matrix is made of following components by percent by volume based on the modification cerul:
65vol.% Brazil wax, 30vol.% polyamide wax, 5vol.% microwax constitute modified waxes matrix.
5. a kind of permanent-magnet ferrite sintered magnet injection moulding particle material as described in claim 1 is preparing permanent-magnet ferrite burning
Tie the application of magnet.
6. application as claimed in claim 5, it is characterised in that the application method are as follows:
Magnetic ferrites sintered magnet injection moulding particle material obtained is injection moulded on injection (mo(u)lding) machine, is sintered
The green body of magnet, injection molding temperature are 130-150 DEG C；Then, the green body of sintered magnet is subjected to the two step degreasing of solvent-heat,
The first step carries out solvent degreasing 5-8h in 45-55 DEG C of normal heptane reagent, and solvent degreasing part is put into batch-type furnace by second step,
Control in-furnace temperature is warming up to 600-650 DEG C from room temperature with the heating rate of 1.5-5 DEG C/min, completes thermal debinding；Finally, will take off
Green body after rouge is put into Muffle furnace, through 1250-1300 DEG C of sintering 2-4h, obtains permanent-magnet ferrite sintered magnet.
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| CN111995384B (en) * | 2020-07-28 | 2022-05-31 | 浙江工业大学 | Preparation method of high-solid-content high-performance injection-molded nickel-zinc ferrite particle material and sintered magnet |
| CN113510241A (en) * | 2021-04-25 | 2021-10-19 | 福建尚辉润德新材料科技有限公司 | Magnetic powder injection molding binder, preparation method and application method |
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| CN101618568A (en) * | 2009-02-27 | 2010-01-06 | 清华大学 | Preparation method of superfine ceramic powder injection molding mixture |
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