CN109231882A - A kind of preparation method of environmental protection magnetostriction materials - Google Patents
A kind of preparation method of environmental protection magnetostriction materials Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
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Abstract
The invention discloses a kind of preparation methods of environmentally friendly magnetostriction materials, specific preparation step are as follows: (1) take 100-108g pyrolusite stone to be placed in pulverizer and crush, it sieves with 100 mesh sieve to obtain pyrolusite powder, pyrolusite powder is placed in reaction kettle, to the concentrated sulfuric acid solution and 22-30g tangerine peel that 52-54g iron powder is added in reaction kettle, 200-280mL mass fraction is 45%, after being stirred 20-28min, reaction kettle is moved into water-bath, it is heated to 51-55 DEG C, insulation reaction 2-2.5h.When the present invention prepares manganese compound, by multi-step impurity removal process, reduce the content of iron, core loss can be reduced, prepared magnetostriction materials have narrow magnetic induction curve, and the sintering powder dc resistivity of the thermally conductive viscose glue of glass and magnetic core slurry is very high, the generation of vortex can be reduced, to reduce core loss and improve magnetic material saturation flux density and telescopicing performance, magnetic particle is bonded also with the thermally conductive viscose glue of glass, the vortex heat dissipation performance of magnetostriction materials is improved, and its toughness and intensity can be improved.
Description
Technical field
The invention belongs to telescopic material technical fields, and in particular to a kind of preparation method of environmental protection magnetostriction materials.
Background technique
Its preparation process of current rare earth giant magnetostrictive material mainly uses traditional directional freeze method, i.e. Bridges is graceful
Method, floating region zone-melting process, mound carat Bielski method.Since the rare earth ultra-magnetostriction material of traditional directional freeze method preparation has
The advantages that magnetostriction coefficient height, one-pass molding, but bar brittleness of its preparation is larger, and resistivity is low, especially lower electricity
Resistance rate in high-frequency alternating magnetic field be very easy to generate vortex so that material Magnetostriction and electromechanical coupling factor sharply under
Drop.In order to reduce eddy-current loss of the rareearth super magnetostrictive in alternating magnetic field, its working frequency is improved, people successively develop
Mull technique and sintering process two kinds of powder metallurgical techniques prepare rare earth ultra-magnetostriction material.It is super that powder metallurgical technique prepares rare earth
The method of magnetostriction materials improves resistivity of material to some extent, it has been reported that using its rare-earth super-magnetic of bonding process
The resistivity of telescopic material is caused to improve 4 orders of magnitude.However, the rare earth ultra-magnetostriction material magnetic of powder metallurgical technique preparation
It causes telescopicing performance obviously relatively low, can only achieve the 50%~70% of directional solidification stick, material cost is obviously higher.Mangneto is stretched at present
It is also easy to produce eddy-current loss under compression material high-frequency alternating magnetic field, the dynamic Magnetostriction of material is caused to be decreased obviously.Especially
Dynamic magnetostriction coefficient and magnetomechanical coupling coefficient it is relatively low (common dynamic magnetostriction coefficient be 1.8nmA-1, magnetic mechanical coupling
0.28) collaboration number is.Therefore, a kind of magnetostriction materials that eddy-current loss is not likely to produce under high-frequency alternating magnetic field are invented to magnetic
Cause telescopic material preparation technical field that there is positive effect.
Summary of the invention
One, technical problems to be solved
The technical problem to be solved in the present invention is to provide a kind of preparation methods of environmentally friendly magnetostriction materials, described in solving
Technical problem.
Two, technical solution
To solve the technical problem, the technical scheme adopted by the invention is that: a kind of system of environmental protection magnetostriction materials
Preparation Method, specific preparation step are as follows:
(1) it takes 100-108g pyrolusite stone to be placed in pulverizer to crush, sieves with 100 mesh sieve to obtain pyrolusite powder, by pyrolusite
Powder is placed in reaction kettle, to reaction kettle be added 52-54g iron powder, 200-280mL mass fraction be 45% concentrated sulfuric acid solution and
22-30g tangerine peel after being stirred 20-28min, reaction kettle is moved into water-bath, is heated to 51-55 DEG C, insulation reaction
2-2.5h, filtering removal filter residue, obtains the leachate；
(2) 72-80g manganese dioxide is added into above-mentioned leachate, is heated to 80-88 DEG C, reacts 2.5-3h, reaction
Oxidation Leaching liquid is obtained, continues that 30-38g manganese carbonate is added into Oxidation Leaching liquid, stirring soaks oxidation until bubble-free generation
Liquid is filtered out, collects filtrate, filtrate is transferred in beaker, and the ammonium hydroxide that mass fraction is 25% is added into beaker and adjusts
To pH6.5-7.0, it is separated by filtration to obtain except iron leachate after stirring 6-10min；
(3) by above-mentioned except iron leachate is placed in a beaker, 70-78mL dehydrated alcohol is added to beaker, then use mass fraction
For solution in 25% ammonium hydroxide adjusting beaker to pH6.5-6.8, beaker is moved into water-bath, is heated to 76-80 DEG C, with
The revolving speed of 700-790r/min stirs and is passed through air with rate of the air blower into beaker with 22-30L/min, and insulated and stirred is anti-
After answering 40-44min, solution in beaker is poured into evaporating dish, is heated to 125-130 DEG C, evaporates 1-1.5h, purification obtains
Manganese compound；
(4) iron oxide, zinc oxide, above-mentioned manganese compound are mixed according to 5 ︰ of mass ratio, 1 ︰ 3, obtains mixture to be ground, it will be to
Poly-vinyl alcohol solution 1 ︰ 3 in mass ratio that mill mixture and mass fraction are 25% is mixed to get suspension, and suspension is put into
It in ball mill, then by ball material mass ratio is that partial size is added into ball mill is 0.1-0.3mm ball milling pearl to 20:1, ball milling 16-20h,
Obtain magnetic core slurry；
(5) according to parts by weight, 20-28 parts of ethylene-vinyl acetate copolymers, 42-50 parts of glass fibres, 10- are weighed
14 parts of expanded graphite powder, 9-10 parts of vinyl ester resins are put into reaction kettle, are heated to 230-240 DEG C, are kneaded 3-4h, cold
But to fiberglass resin is obtained after room temperature, soft magnetic ferrite powder, fiberglass resin is mixed according to 2 ︰ 5 of mass ratio, are put into stainless steel mold
In tool, it is preheated to 110-150 DEG C, 31-35min is preheated, obtains the thermally conductive viscose glue of glass；
(6) magnetic core slurry is poured into cylindrical die, it is to suppress 5- in 6-7MPa press machine that mold, which is put into pressure,
After 7min, mold is put into resistance furnace and is sintered, obtain sintering powder, by sintering powder and the thermally conductive viscose glue of glass according to weight ratio
5 ︰ 1 mixing, being fitted into mold and being placed in temperature is curing and drying 3-3.5h in 110-120 DEG C of baking oven, obtains magnetostriction materials.
The sintering process of step (6) described sintering powder are as follows: be warming up to 1060-1100 DEG C with the rate of 2-3 DEG C/min, protect
Temperature sintering 2-2.5h after continuation rises to 1210-1250 DEG C with same heating rate, is naturally cooling to 1060-1100 DEG C, heat preservation
It is sintered 1-1.5h.
Three, beneficial effect
The present invention is compared to the prior art, has the following beneficial effects:
One, when the present invention prepares manganese compound, by multi-step impurity removal process, the content of iron is reduced, core loss can be reduced,
Prepared magnetostriction materials have narrow magnetic induction curve, and the sintering powder of glass thermally conductive viscose glue and magnetic core slurry
Dc resistivity is very high, it is possible to reduce the generation of vortex, to reduce core loss and improve magnetic material saturation flux density
And telescopicing performance, magnetic particle is bonded also with the thermally conductive viscose glue of glass, improves the vortex heat dissipation performance of magnetostriction materials,
And its toughness and intensity can be improved.
Two, sintering temperature is raised to higher temperature first when present invention sintering, then drops to sintering temperature compared with low temperature
When spending, heat preservation a period of time, in this stage, crystal grain is not grown significantly, by controlling the variation of temperature, is inhibiting crystal boundary
While migration leads to grain growth, grain boundary decision is kept to be in active state, avoids the Growing Process of Crystal Particles in sintering later period,
Crystal grain non-growing period completes sintering, and sintering is made to continue and realize densification, the magnetic material that sintering can be made to obtain
With more evenly tiny particle and higher density, wherein iron oxide is uniformly distributed in magnetic material, and magnetic material is used
Work under transformer and can produce highdensity magnetic induction curve, improve the saturation flux density of magnetic material, be sintered slurry with
Organic solvent polyvinyl alcohol is binding material, compares other gel cementing material, the Curie temperature of magnetic material can be made to become higher,
Increase saturation flux density, so that magnetostriction materials telescopicing performance improves, has a extensive future.
Specific embodiment
Below with reference to embodiment, a specific embodiment of the invention is described in detail.
Embodiment 1
It takes 100g pyrolusite stone to be placed in pulverizer to crush, sieves with 100 mesh sieve to obtain pyrolusite powder, pyrolusite powder is placed in instead
It answers in kettle, to the concentrated sulfuric acid solution and 22g tangerine peel that 52g iron powder is added in reaction kettle, 200mL mass fraction is 45%, is stirred
After 20min, reaction kettle is moved into water-bath, is heated to 51 DEG C, insulation reaction 2h, filtering removal filter residue is leached
Liquid；72g manganese dioxide is added into above-mentioned leachate, is heated to 80 DEG C, reacts 2.5h, obtains Oxidation Leaching liquid, continues
30g manganese carbonate is added into Oxidation Leaching liquid, stirring filters Oxidation Leaching liquid until bubble-free generation, filtrate is collected,
Filtrate is transferred in beaker, the ammonium hydroxide that mass fraction is 25% is added into beaker, adjusting pH is 6.5, stirs mistake after 6min
It filters isolated except iron leachate；By above-mentioned except iron leachate is placed in a beaker, 70mL dehydrated alcohol is added to beaker, then use ammonia
Water is adjusted pH value of solution in beaker and moves into water-bath beaker to 6.5, be heated to 76 DEG C, stirred with the revolving speed of 700r/min
It mixes and is passed through air with rate of the air blower into beaker with 22L/min, after insulated and stirred reacts 40min, by solution in beaker
It pours into evaporating dish, is heated to 125 DEG C, evaporate 1h, purification obtains manganese compound；By iron oxide, zinc oxide, above-mentioned manganese compound
It is mixed in mass ratio for 5 ︰, 1 ︰ 3, obtains mixture to be ground, the poly-vinyl alcohol solution for being 25% by mixture to be ground and mass fraction
Suspension is mixed to get for 1 ︰ 3 in mass ratio, suspension is put into ball mill, then by ball material mass ratio is 20:1 to ball mill
Middle that the ball milling pearl that partial size is 0.1mm is added, ball milling 16h obtains magnetic core slurry；According to parts by weight, 20 parts of ethyl vinyl acetates are weighed
Vinyl ester copolymers, 42 parts of glass fibres, 10 parts of expanded graphite powder, 9 parts of vinyl ester resins are put into reaction kettle, heat temperature raising
To 230 DEG C, it is kneaded 3h, fiberglass resin is obtained after being cooled to room temperature, is in mass ratio 2 ︰ 5, by soft magnetic ferrite powder, fiberglass resin
Mixing, is put into the stainless steel mould for being preheated to 110 DEG C, preheats 31min, obtains the thermally conductive viscose glue of glass；Magnetic core slurry is poured into
In cylindrical die, mold is put into after suppressing 5min in press machine with the pressure of 6MPa, mold is put into resistance furnace, with 2
DEG C/rate of min is warming up to 1060 DEG C, heat preservation sintering 2h, after continuation rises to 1210 DEG C with same heating rate, Temperature fall
To 1060 DEG C, heat preservation sintering 1h obtains sintering powder, is in mass ratio 5 ︰ 1, and sintering powder and the thermally conductive viscose glue of glass are mixed,
It is fitted into mold and is placed in curing and drying 3h in the baking oven that set temperature is 110 DEG C, obtain magnetostriction materials.
Embodiment 2
It takes 104g pyrolusite stone to be placed in pulverizer to crush, sieves with 100 mesh sieve to obtain pyrolusite powder, pyrolusite powder is placed in instead
It answers in kettle, to the concentrated sulfuric acid solution and 26g tangerine peel that 53g iron powder is added in reaction kettle, 240mL mass fraction is 45%, is stirred
After 24min, reaction kettle is moved into water-bath, is heated to 53 DEG C, insulation reaction 2h, filtering removal filter residue is leached
Liquid；76g manganese dioxide is added into above-mentioned leachate, is heated to 84 DEG C, reacts 2.5h, obtains Oxidation Leaching liquid, continues
34g manganese carbonate is added into Oxidation Leaching liquid, stirring filters Oxidation Leaching liquid until bubble-free generation, filtrate is collected,
Filtrate is transferred in beaker, the ammonium hydroxide that mass fraction is 25% is added into beaker, adjusting pH is 6.7, stirs mistake after 8min
It filters isolated except iron leachate；By above-mentioned except iron leachate is placed in a beaker, 74mL dehydrated alcohol is added to beaker, then use ammonia
Water is adjusted pH value of solution in beaker and moves into water-bath beaker to 6.7, be heated to 78 DEG C, stirred with the revolving speed of 745r/min
It mixes and is passed through air with rate of the air blower into beaker with 26L/min, after insulated and stirred reacts 42min, by solution in beaker
It pours into evaporating dish, is heated to 127 DEG C, evaporate 1.5h, purification obtains manganese compound；By iron oxide, zinc oxide, above-mentioned manganese
Object is 5 ︰, 1 ︰ 3 mixing in mass ratio, obtains mixture to be ground, and mixture to be ground is molten for 25% polyvinyl alcohol with mass fraction
Liquid is that 1 ︰ 3 is mixed to get suspension in mass ratio, and suspension is put into ball mill, then by ball material mass ratio is 20:1 to ball milling
The ball milling pearl that partial size is 0.2mm is added in machine, ball milling 18h obtains magnetic core slurry；According to parts by weight, 24 portions of ethylene-vinegar are weighed
Vinyl acetate copolymer, 46 parts of glass fibres, 12 parts of expanded graphite powder, 9.5 parts of vinyl ester resins are put into reaction kettle, heating
235 DEG C are warming up to, 3.5h is kneaded, fiberglass resin is obtained after being cooled to room temperature, is in mass ratio 2 ︰ 5, by soft magnetic ferrite powder, glass
Fiberized resin mixing, is put into the stainless steel mould for being preheated to 130 DEG C, preheats 33min, obtains the thermally conductive viscose glue of glass；Magnetic core is starched
Material pours into cylindrical die, mold is put into after suppressing 6min in press machine with the pressure of 6.5MPa, mold is put into resistance
In furnace, 1080 DEG C, heat preservation sintering 2.5h are warming up to the rate of 2 DEG C/min, continues to rise to 1230 DEG C with same heating rate
Afterwards, 1080 DEG C are naturally cooling to, heat preservation sintering 1.5h obtains sintering powder, is in mass ratio 5 ︰ 1, by sintering powder and glass
Thermally conductive viscose glue mixing is fitted into mold and is placed in curing and drying 3.5h in the baking oven that set temperature is 115 DEG C, obtains magnetostriction material
Material.
Embodiment 3
It takes 108g pyrolusite stone to be placed in pulverizer to crush, sieves with 100 mesh sieve to obtain pyrolusite powder, pyrolusite powder is placed in instead
It answers in kettle, to the concentrated sulfuric acid solution and 30g tangerine peel that 54g iron powder is added in reaction kettle, 280mL mass fraction is 45%, is stirred
After 28min, reaction kettle is moved into water-bath, is heated to 55 DEG C, insulation reaction 2.5h, filtering removal filter residue is soaked
Liquid out；80g manganese dioxide is added into above-mentioned leachate, is heated to 88 DEG C, reacts 3h, obtains Oxidation Leaching liquid, continues
38g manganese carbonate is added into Oxidation Leaching liquid, stirring filters Oxidation Leaching liquid until bubble-free generation, filtrate is collected,
Filtrate is transferred in beaker, the ammonium hydroxide that mass fraction is 25% is added into beaker, adjusting pH is 7.0, stirs mistake after 10min
It filters isolated except iron leachate；By above-mentioned except iron leachate is placed in a beaker, 78mL dehydrated alcohol is added to beaker, then use ammonia
Water is adjusted pH value of solution in beaker and moves into water-bath beaker to 6.8, be heated to 80 DEG C, stirred with the revolving speed of 790r/min
It mixes and is passed through air with rate of the air blower into beaker with 30L/min, after insulated and stirred reacts 44min, by solution in beaker
It pours into evaporating dish, is heated to 130 DEG C, evaporate 1.5h, purification obtains manganese compound；By iron oxide, zinc oxide, above-mentioned manganese
Object is 5 ︰, 1 ︰ 3 mixing in mass ratio, obtains mixture to be ground, and mixture to be ground is molten for 25% polyvinyl alcohol with mass fraction
Liquid is that 1 ︰ 3 is mixed to get suspension in mass ratio, and suspension is put into ball mill, then by ball material mass ratio is 20:1 to ball milling
The ball milling pearl that partial size is 0.3mm is added in machine, ball milling 20h obtains magnetic core slurry；According to parts by weight, 28 portions of ethylene-vinegar are weighed
Vinyl acetate copolymer, 50 parts of glass fibres, 14 parts of expanded graphite powder, 10 parts of vinyl ester resins are put into reaction kettle, heating
240 DEG C are warming up to, 4h is kneaded, fiberglass resin is obtained after being cooled to room temperature, is in mass ratio 2 ︰ 5, by soft magnetic ferrite powder, glass
Resin mixing, is put into the stainless steel mould for being preheated to 150 DEG C, preheats 35min, obtains the thermally conductive viscose glue of glass；By magnetic core slurry
It pours into cylindrical die, mold is put into after suppressing 7min in press machine with the pressure of 7MPa, mold is put into resistance furnace,
1100 DEG C, heat preservation sintering 2.5h, after continuation rises to 1250 DEG C with same heating rate are warming up to the rate of 3 DEG C/min, from
1100 DEG C so are cooled to, it is in mass ratio 5 ︰ 1 that heat preservation sintering 2.5h, which obtains sintering powder, and sintering powder and glass is thermally conductive viscous
Glue mixing is fitted into mold and is placed in curing and drying 3.5h in the baking oven that set temperature is 120 DEG C, obtains magnetostriction materials.
Comparative example
With the magnetostriction materials of Shanghai company production as a comparison case to magnetostriction materials produced by the present invention and
Magnetostriction materials in comparative example carry out performance detection, and testing result is as shown in table 1:
Test method:
Intensity test is detected using compression Strength testing machine；
Tensile-sbear strength test is detected using tensile shear strength testing machine；
Magnetostriction coefficient test: it under the conditions of magnetic field 80kA/m, 5MPa prestressing force, is sent out using JEOLJSM-7001F
Scanning electron microscope is penetrated to detect magnetostriction materials；
The test of dynamic magnetostriction coefficient: under the conditions of magnetic field 100kA/m, 5MPa prestressing force, JEOLJSM-7001F is used
Field emission scanning electron microscope detects magnetostriction materials；
Magnetomechanical coupling coefficient test: it is set under the conditions of 120kA/m using the Radiant PrecisionLC of moral instrument production
It is standby to be detected；
Resistivity measurement is detected using multimeter；
Eddy-current loss tests the eddy-current loss performance that material is characterized using TPS-500M soft mangnetic materials measuring instrument.
1 magnetostriction materials performance measurement result of table
| Test item | Embodiment 1 | Embodiment 2 | Embodiment 3 | Comparative example |
| Compression strength (MPa) | 497.23 | 500.25 | 503.61 | 402.15 |
| Tensile-sbear strength (MPa) | 33 | 34 | 35 | 21 |
| Magnetostriction coefficient (× 10-6) | 1363 | 1365 | 1367 | 1161 |
| Dynamic magnetostriction coefficient (nmA-1) | 2.51 | 2.57 | 2.69 | 1.91 |
| Magnetomechanical coupling coefficient | 0.39 | 0.40 | 0.42 | 0.29 |
| Resistivity (Ω m) | 8.06 | 8.16 | 8.25 | 4.36 |
| Eddy-current loss (W/m3) | 514 | 513 | 511 | 861 |
High, the mechanical strength according to the magnetostriction materials compression strength of the invention of data among the above and tensile-sbear strength
Height, dynamic magnetostriction coefficient is high, reaches 2.69nmA-1, magnetomechanical coupling coefficient is high, reaches 0.42, and resistivity is high, reduces
The generation of vortex, eddy-current loss value is low, has broad application prospects.
The above is only specific application examples of the invention, are not limited in any way to protection scope of the present invention.
Claims (2)
1. a kind of preparation method of environmental protection magnetostriction materials, which is characterized in that specific preparation step are as follows:
(1) it takes 100-108g pyrolusite stone to be placed in pulverizer to crush, sieves with 100 mesh sieve to obtain pyrolusite powder, pyrolusite powder is set
In reaction kettle, to the concentrated sulfuric acid solution and 22-30g that 52-54g iron powder is added in reaction kettle, 200-280mL mass fraction is 45%
Tangerine peel after being stirred 20-28min, reaction kettle is moved into water-bath, is heated to 51-55 DEG C, insulation reaction 2-
2.5h filtering removal filter residue, obtains the leachate；
(2) 72-80g manganese dioxide is added into above-mentioned leachate, is heated to 80-88 DEG C, reacts 2.5-3h, reaction obtains
Oxidation Leaching liquid continues that 30-38g manganese carbonate is added into Oxidation Leaching liquid, and stirring is until bubble-free generates, to Oxidation Leaching liquid
It is filtered, collects filtrate, filtrate is transferred in beaker, the ammonium hydroxide that mass fraction is 25% is added into beaker and is adjusted to
PH6.5-7.0 is separated by filtration to obtain except iron leachate after stirring 6-10min；
(3) by above-mentioned except iron leachate is placed in a beaker, 70-78mL dehydrated alcohol is added to beaker, then be with mass fraction
Solution is heated to 76-80 DEG C in beaker immigration water-bath to pH6.5-6.8 in 25% ammonium hydroxide adjusting beaker, with
The revolving speed of 700-790r/min stirs and is passed through air with rate of the air blower into beaker with 22-30L/min, and insulated and stirred is anti-
After answering 40-44min, solution in beaker is poured into evaporating dish, is heated to 125-130 DEG C, evaporates 1-1.5h, purification obtains
Manganese compound；
(4) iron oxide, zinc oxide, above-mentioned manganese compound are mixed according to 5 ︰ of mass ratio, 1 ︰ 3, obtains mixture to be ground, it will be mixed wait grind
It closes poly-vinyl alcohol solution 1 ︰ 3 in mass ratio that material is 25% with mass fraction and is mixed to get suspension, suspension is put into ball milling
It in machine, then by ball material mass ratio is that partial size is added into ball mill is 0.1-0.3mm ball milling pearl to 20:1, ball milling 16-20h is obtained
Magnetic core slurry；
(5) according to parts by weight, 20-28 parts of ethylene-vinyl acetate copolymers, 42-50 parts of glass fibres, 10-14 parts are weighed
Expanded graphite powder, 9-10 parts of vinyl ester resins are put into reaction kettle, are heated to 230-240 DEG C, are kneaded 3-4h, are cooled to
Fiberglass resin is obtained after room temperature, and soft magnetic ferrite powder, fiberglass resin are mixed according to 2 ︰ 5 of mass ratio, are put into stainless steel mould,
It is preheated to 110-150 DEG C, 31-35min is preheated, obtains the thermally conductive viscose glue of glass；
(6) magnetic core slurry is poured into cylindrical die, after mold is put into pressure to suppress 5-7min in 6-7MPa press machine,
Mold is put into resistance furnace and is sintered, sintering powder is obtained, sintering powder and the thermally conductive viscose glue of glass are mixed according to 5 ︰ 1 of weight ratio
It closes, being fitted into mold and being placed in temperature is curing and drying 3-3.5h in 110-120 DEG C of baking oven, obtains magnetostriction materials.
2. a kind of preparation method of environmentally friendly magnetostriction materials according to claim 1, it is characterised in that: step (6) institute
State the sintering process of sintering powder are as follows: be warming up to 1060-1100 DEG C, heat preservation sintering 2-2.5h with the rate of 2-3 DEG C/min, continue
After rising to 1210-1250 DEG C with same heating rate, it is naturally cooling to 1060-1100 DEG C, heat preservation sintering 1-1.5h.
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| JPH0224303B2 (en) * | 1982-05-21 | 1990-05-29 | Dai Ichi Seiko Co Ltd | |
| CN107827448A (en) * | 2017-11-21 | 2018-03-23 | 常州创索新材料科技有限公司 | A kind of preparation method of Mn-Zn soft magnetic ferrite |
| CN108441133A (en) * | 2018-03-12 | 2018-08-24 | 常州诺丁精密机械制造有限公司 | A kind of preparation method of magnetism heat-conducting silica gel sheet |
| CN108640668A (en) * | 2018-07-05 | 2018-10-12 | 常州市阿曼特医药科技有限公司 | A kind of preparation method of magnetostriction materials |
| CN109133716A (en) * | 2018-08-24 | 2019-01-04 | 张晓久 | A kind of preparation method of electronic element radiating silica gel piece |
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