CN111777419A - Sintering process of magnetic ferrite core - Google Patents

Sintering process of magnetic ferrite core Download PDF

Info

Publication number
CN111777419A
CN111777419A CN202010476949.4A CN202010476949A CN111777419A CN 111777419 A CN111777419 A CN 111777419A CN 202010476949 A CN202010476949 A CN 202010476949A CN 111777419 A CN111777419 A CN 111777419A
Authority
CN
China
Prior art keywords
sintering
treatment
stirring
magnetization
ferrite core
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202010476949.4A
Other languages
Chinese (zh)
Other versions
CN111777419B (en
Inventor
沈桂良
张惠明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tianchang Shuoyuan Magnetoelectric Co ltd
Original Assignee
Tianchang Shuoyuan Magnetoelectric Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tianchang Shuoyuan Magnetoelectric Co ltd filed Critical Tianchang Shuoyuan Magnetoelectric Co ltd
Priority to CN202010476949.4A priority Critical patent/CN111777419B/en
Publication of CN111777419A publication Critical patent/CN111777419A/en
Application granted granted Critical
Publication of CN111777419B publication Critical patent/CN111777419B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/26Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/64Burning or sintering processes
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30Constituents and secondary phases not being of a fibrous nature
    • C04B2235/34Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3418Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30Constituents and secondary phases not being of a fibrous nature
    • C04B2235/34Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/349Clays, e.g. bentonites, smectites such as montmorillonite, vermiculites or kaolines, e.g. illite, talc or sepiolite
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30Constituents and secondary phases not being of a fibrous nature
    • C04B2235/44Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
    • C04B2235/444Halide containing anions, e.g. bromide, iodate, chlorite
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/60Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
    • C04B2235/602Making the green bodies or pre-forms by moulding
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/65Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
    • C04B2235/656Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/65Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
    • C04B2235/656Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
    • C04B2235/6562Heating rate
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/65Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
    • C04B2235/656Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
    • C04B2235/6567Treatment time

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Magnetic Ceramics (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

The invention discloses a sintering process of a magnetic ferrite core, which comprises the following steps: the method comprises the following steps: preparing a sintering liquid: adding phosphoric acid into sodium citrate, then adjusting the pH value of the solution to 4.0-5.0, then adding modified ceramic powder, stirring at the rotation speed of 100-. The magnetic ferrite core is treated by the sintering liquid, the magnetic ferrite core is sent into the sintering liquid in the first step, then is stirred for 15min at the rotating speed of 500r/min, and then is sent into a magnetization tank for magnetization treatment, and the sintering liquid can form stable chemical substances on the surface of the magnetic core material, so that the product performance is more stable.

Description

Sintering process of magnetic ferrite core
Technical Field
The invention relates to the technical field of magnetic ferrite cores, in particular to a sintering process of a magnetic ferrite core.
Background
The ferrite core is made of dense and homogeneous non-metallic magnetic material with ceramic structure and low coercive force, and is also called soft magnetic ferrite. It consists of iron oxide (Fe2O3) and one or more oxide or carbonate compounds of other metals (e.g. manganese, zinc, nickel, magnesium). Compared with other types of magnetic materials, the ferrite has the advantages of high magnetic conductivity, high resistance in a wide frequency range, low eddy current loss and the like. These material properties make ferrites ideal for the fabrication of high frequency transformers, wide band transformers, tunable inductors and other high frequency circuits from 10kHz to 50 MHz.
The existing magnetic ferrite core sintering process is more conventional, the performance change of the magnetic material after sintering is not very obvious, and the properties such as strength and the like of the magnetic material cannot be obviously improved, so that further improvement treatment is needed.
Disclosure of Invention
The present invention is directed to a sintering process for magnetic ferrite cores to solve the above-mentioned problems of the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a sintering process of a magnetic ferrite core, which comprises the following steps:
the method comprises the following steps: preparing a sintering liquid: adding phosphoric acid into sodium citrate, then adjusting the pH value of the solution to 4.0-5.0, then adding modified ceramic powder, stirring at the rotation speed of 100-;
step two, treating the sintering liquid: sending the magnetic ferrite core into the sintering liquid in the first step, stirring for 15-25min at the rotating speed of 500-1000r/min, sending into a magnetization tank for magnetization treatment, and finishing magnetization;
step three, hot pressing treatment: carrying out hot pressing treatment on the magnetic core treated in the step two, wherein the hot pressing pressure is 10-20MPa, the hot pressing temperature is 300-400 ℃, then carrying out heat preservation for 15-25min, and then cooling the temperature to room temperature at the speed of 2 ℃/min;
step four, primary sintering treatment: the magnetic core after the hot pressing treatment is firstly sent into a sintering furnace to be sintered for 10-20min at the temperature of 1000-1500 ℃, and then is naturally cooled to the room temperature;
step five, plasma treatment: the material processed in the step four is sent into a plasma box, the plasma processing power is 500-700W, and the processing time is 15-25 min;
step six, secondary sintering treatment: the material is heated to 600 ℃ at the speed of 2-5 ℃/min, then heat preservation treatment is carried out, then the temperature is raised to 1000 ℃, heat preservation is carried out for 10min, and finally cooling is carried out to the room temperature.
Preferably, the modification method of the modified ceramic powder comprises the following steps: adding the ceramic powder into a magnetic stirrer, adding a zinc chloride pore-forming agent, adding phosphoric acid, stirring at the rotation speed of 500-400 r/min for 15-25min, raising the stirring temperature to 60-100 ℃, adding improved silicon dioxide after stirring, reducing the stirring rotation speed to 200-400r/min, and continuing stirring for 20-30min to obtain the modified ceramic powder.
Preferably, the modifying method of the modified silica is as follows: dispersing silicon dioxide into polyvinyl alcohol solution, then adding montmorillonite, finally adding ammonia water to adjust the pH value to 10-11.0, and then stirring at the rotating speed of 100-200r/min for 15-25 min.
Preferably, the magnetization intensity of the magnetization treatment in the magnetization tank is 2-5BT, and the magnetization time is 10-20 min.
Preferably, the magnetization intensity of the magnetization treatment in the magnetization tank is 3.5BT, and the magnetization time is 15 min.
Preferably, the heat preservation time of the secondary sintering treatment is 15-25 min.
Preferably, the heat preservation time of the secondary sintering treatment is 20 min.
Preferably, the secondary sintering treatment is cooled to room temperature by immediately cooling to room temperature by water cooling.
Compared with the prior art, the invention has the following beneficial effects:
(1) the magnetic ferrite core is treated by the sintering liquid, the magnetic ferrite core is sent into the sintering liquid in the first step, then is stirred for 15min at the rotating speed of 500r/min, and then is sent into a magnetization tank for magnetization treatment, and the sintering liquid can form stable chemical substances on the surface of the magnetic core material, so that the product performance is more stable.
(2) The hot pressing treatment aims at enabling the product structure to be more compact, so that the material performance is more perfect, and the primary sintering treatment, the plasma treatment and the secondary sintering treatment improve the sintering quality, so that the product performance is improved, and the product strength and other properties can be obviously improved.
(3) The modification method of the modified ceramic powder comprises the following steps: adding ceramic powder into a magnetic stirrer, adding a zinc chloride pore-forming agent, adding phosphoric acid, stirring at the rotating speed of 500r/min for 15min, raising the stirring temperature to 60 ℃, after stirring, adding improved silicon dioxide, reducing the stirring rotating speed to 200r/min, and continuing stirring for 20min to obtain the modified ceramic powder.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to specific embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the sintering process of the magnetic ferrite core of the embodiment comprises the following steps:
the method comprises the following steps: preparing a sintering liquid: adding phosphoric acid into sodium citrate, adjusting the pH value of the solution to 4.0, then adding modified ceramic powder, stirring at the rotating speed of 100r/min for 15min, then adding chitosan and talcum powder, continuing stirring at the rotating speed of 500r/min for 15min, and obtaining sintering liquid after stirring;
step two, treating the sintering liquid: sending the magnetic ferrite core into the sintering liquid obtained in the first step, stirring at a rotating speed of 500r/min for 15min, sending into a magnetizing tank for magnetization treatment, and finishing magnetization;
step three, hot pressing treatment: carrying out hot pressing treatment on the magnetic core treated in the step two, wherein the hot pressing pressure is 10MPa, the hot pressing temperature is 300 ℃, then carrying out heat preservation for 15min, and then cooling the temperature to room temperature at the speed of 2 ℃/min;
step four, primary sintering treatment: the magnetic core after the hot pressing treatment is firstly sent into a sintering furnace to be sintered for 10-20min at the temperature of 1000 ℃, and then is naturally cooled to the room temperature;
step five, plasma treatment: feeding the material processed in the step four into a plasma box, wherein the plasma processing power is 500W, and the processing time is 15 min;
step six, secondary sintering treatment: the material is heated to 600 ℃ at the speed of 2 ℃/min, then is subjected to heat preservation treatment, is heated to 1000 ℃, is subjected to heat preservation for 10min, and is cooled to room temperature.
Preferably, the modification method of the modified ceramic powder comprises the following steps: adding ceramic powder into a magnetic stirrer, adding a zinc chloride pore-forming agent, adding phosphoric acid, stirring at the rotating speed of 500r/min for 15min, raising the stirring temperature to 60 ℃, adding improved silicon dioxide after stirring, reducing the stirring rotating speed to 200r/min, and continuing stirring for 20min to obtain the modified ceramic powder.
The method for improving silicon dioxide of this embodiment is: dispersing silicon dioxide into polyvinyl alcohol solution, adding montmorillonite, adding ammonia water to adjust pH to 10, and stirring at 100r/min for 15 min.
The magnetization intensity of the magnetization treatment in the magnetization tank of this example was 2BT, and the magnetization time was 10 min.
The second-stage sintering treatment heat preservation time of the embodiment is 15 min.
The second-stage sintering treatment heat preservation time of the embodiment is 20 min.
Example 2:
the sintering process of the magnetic ferrite core of the embodiment comprises the following steps:
the method comprises the following steps: preparing a sintering liquid: adding phosphoric acid into sodium citrate, adjusting the pH value of the solution to 4.0, then adding modified ceramic powder, stirring at the rotating speed of 200r/min for 25min, then adding chitosan and talcum powder, continuing stirring for 25min at the stirring rotating speed of 1000r/min, and obtaining sintering liquid after stirring;
step two, treating the sintering liquid: sending the magnetic ferrite core into the sintering liquid obtained in the first step, stirring at the rotating speed of 1000r/min for 25min, sending into a magnetizing tank for magnetization treatment, and finishing magnetization;
step three, hot pressing treatment: carrying out hot pressing treatment on the magnetic core treated in the step two, wherein the hot pressing pressure is 20MPa, the hot pressing temperature is 400 ℃, then carrying out heat preservation for 25min, and then cooling the temperature to room temperature at the speed of 2 ℃/min;
step four, primary sintering treatment: the magnetic core after the hot pressing treatment is firstly sent into a sintering furnace to be sintered for 20min at the temperature of 1500 ℃, and then is naturally cooled to the room temperature;
step five, plasma treatment: feeding the material processed in the step four into a plasma box, wherein the plasma processing power is 700W, and the processing time is 25 min;
step six, secondary sintering treatment: the material is heated to 600 ℃ at the speed of 5 ℃/min, then is subjected to heat preservation treatment, is heated to 1000 ℃, is subjected to heat preservation for 10min, and is cooled to room temperature.
Preferably, the modification method of the modified ceramic powder comprises the following steps: adding ceramic powder into a magnetic stirrer, adding a zinc chloride pore-forming agent, adding phosphoric acid, stirring at the rotating speed of 1000r/min for 25min, increasing the stirring temperature to 100 ℃, adding improved silicon dioxide after stirring, reducing the stirring rotating speed to 400r/min, and continuing stirring for 30min to obtain the modified ceramic powder.
The method for improving silicon dioxide of this embodiment is: dispersing silicon dioxide into polyvinyl alcohol solution, adding montmorillonite, adding ammonia water to adjust pH to 11.0, and stirring at a rotation speed of 200r/min for 25 min.
The magnetization intensity of the magnetization treatment in the magnetization tank of this example was 5BT, and the magnetization time was 20 min.
The second-stage sintering treatment heat preservation time of the embodiment is 25 min.
The method for cooling the secondary sintering treatment to room temperature in this embodiment is to immediately cool the secondary sintering treatment to room temperature by means of water cooling.
Example 3:
the sintering process of the magnetic ferrite core of the embodiment comprises the following steps:
the method comprises the following steps: preparing a sintering liquid: adding phosphoric acid into sodium citrate, adjusting the pH value of the solution to 4.5, then adding modified ceramic powder, stirring at the rotating speed of 150r/min for 20min, then adding chitosan and talcum powder, continuing stirring for 20min at the stirring rotating speed of 750r/min, and obtaining sintering liquid after stirring;
step two, treating the sintering liquid: sending the magnetic ferrite core into the sintering liquid obtained in the first step, stirring at a rotating speed of 750r/min for 20min, sending into a magnetizing tank for magnetization treatment, and finishing magnetization;
step three, hot pressing treatment: carrying out hot pressing treatment on the magnetic core treated in the step two, wherein the hot pressing pressure is 15MPa, the hot pressing temperature is 350 ℃, then keeping the temperature for 20min, and then reducing the temperature to room temperature at the speed of 2 ℃/min;
step four, primary sintering treatment: the magnetic core after the hot pressing treatment is firstly sent into a sintering furnace to be sintered for 15min at 1250 ℃, and then is naturally cooled to room temperature;
step five, plasma treatment: feeding the material processed in the step four into a plasma box, wherein the plasma processing power is 600W, and the processing time is 20 min;
step six, secondary sintering treatment: the material is heated to 600 ℃ at the speed of 3.5 ℃/min, then heat preservation treatment is carried out, then the temperature is raised to 1000 ℃, heat preservation is carried out for 10min, and finally cooling is carried out to the room temperature.
Preferably, the modification method of the modified ceramic powder comprises the following steps: adding ceramic powder into a magnetic stirrer, adding a zinc chloride pore-forming agent, adding phosphoric acid, stirring at the rotating speed of 750r/min for 20min, increasing the stirring temperature to 80 ℃, adding improved silicon dioxide after stirring, reducing the stirring rotating speed to 300r/min, and continuing stirring for 25min to obtain the modified ceramic powder.
The method for improving silicon dioxide of this embodiment is: dispersing silicon dioxide into polyvinyl alcohol solution, adding montmorillonite, adding ammonia water to adjust pH to 10.5, and stirring at 150r/min for 20 min.
The magnetization intensity of the magnetization treatment in the magnetization tank of this example was 3.5BT, and the magnetization time was 15 min.
The second-stage sintering treatment heat preservation time of the embodiment is 20 min.
The method for cooling the secondary sintering treatment to room temperature in this embodiment is to immediately cool the secondary sintering treatment to room temperature by means of water cooling.
Comparative example 1:
the materials and preparation process are basically the same as those of example 3, except that the materials which are conventional in the market are adopted.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (8)

1. A sintering process of a magnetic ferrite core is characterized by comprising the following steps:
the method comprises the following steps: preparing a sintering liquid: adding phosphoric acid into sodium citrate, then adjusting the pH value of the solution to 4.0-5.0, then adding modified ceramic powder, stirring at the rotation speed of 100-;
step two, treating the sintering liquid: sending the magnetic ferrite core into the sintering liquid in the first step, stirring for 15-25min at the rotating speed of 500-1000r/min, sending into a magnetization tank for magnetization treatment, and finishing magnetization;
step three, hot pressing treatment: carrying out hot pressing treatment on the magnetic core treated in the step two, wherein the hot pressing pressure is 10-20MPa, the hot pressing temperature is 300-400 ℃, then carrying out heat preservation for 15-25min, and then cooling the temperature to room temperature at the speed of 2 ℃/min;
step four, primary sintering treatment: the magnetic core after the hot pressing treatment is firstly sent into a sintering furnace to be sintered for 10-20min at the temperature of 1000-1500 ℃, and then is naturally cooled to the room temperature;
step five, plasma treatment: the material processed in the step four is sent into a plasma box, the plasma processing power is 500-700W, and the processing time is 15-25 min;
step six, secondary sintering treatment: the material is heated to 600 ℃ at the speed of 2-5 ℃/min, then heat preservation treatment is carried out, then the temperature is raised to 1000 ℃, heat preservation is carried out for 10min, and finally cooling is carried out to the room temperature.
2. The sintering process of a magnetic ferrite core according to claim 1, wherein the modification method of the modified ceramic powder is: adding the ceramic powder into a magnetic stirrer, adding a zinc chloride pore-forming agent, adding phosphoric acid, stirring at the rotation speed of 500-400 r/min for 15-25min, raising the stirring temperature to 60-100 ℃, adding improved silicon dioxide after stirring, reducing the stirring rotation speed to 200-400r/min, and continuing stirring for 20-30min to obtain the modified ceramic powder.
3. A process for sintering a magnetic ferrite core as claimed in claim 2, wherein said modified silica is modified by: dispersing silicon dioxide into polyvinyl alcohol solution, then adding montmorillonite, finally adding ammonia water to adjust the pH value to 10-11.0, and then stirring at the rotating speed of 100-200r/min for 15-25 min.
4. A process for sintering a magnetic ferrite core according to claim 1, wherein the magnetization of said magnetization tank is 2-5BT for 10-20 min.
5. A sintering process of a magnetic ferrite core according to claim 4, characterized in that the magnetization intensity of the magnetization treatment in the magnetization tank is 3.5BT and the magnetization time is 15 min.
6. A process for sintering a magnetic ferrite core according to claim 1, wherein said secondary sintering treatment is carried out for a holding time of 15-25 min.
7. A process according to claim 6, wherein said secondary sintering is carried out for a holding time of 20 min.
8. A process of sintering a magnetic ferrite core as claimed in claim 1, wherein said secondary sintering treatment is carried out by cooling to room temperature immediately by water cooling.
CN202010476949.4A 2020-05-29 2020-05-29 Sintering process of magnetic ferrite core Active CN111777419B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010476949.4A CN111777419B (en) 2020-05-29 2020-05-29 Sintering process of magnetic ferrite core

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010476949.4A CN111777419B (en) 2020-05-29 2020-05-29 Sintering process of magnetic ferrite core

Publications (2)

Publication Number Publication Date
CN111777419A true CN111777419A (en) 2020-10-16
CN111777419B CN111777419B (en) 2022-05-31

Family

ID=72754443

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010476949.4A Active CN111777419B (en) 2020-05-29 2020-05-29 Sintering process of magnetic ferrite core

Country Status (1)

Country Link
CN (1) CN111777419B (en)

Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05285590A (en) * 1992-04-14 1993-11-02 Ube Ind Ltd Production of sand core
CN1623953A (en) * 2003-12-01 2005-06-08 浙江天通电子股份有限公司 Manganese zinc ferrite soft magnetic sinitering method
CN1812943A (en) * 2003-06-06 2006-08-02 豪富公司 Multi-layer fire barrier systems
CN101089108A (en) * 2007-05-17 2007-12-19 钢铁研究总院 Inorganic insulating adhesive for soft magentic metal powder core andits prepn process
CN101236829A (en) * 2007-12-07 2008-08-06 广东风华高新科技股份有限公司 A making method for magnetic core of Mn-Zn soft magnetic ferrite
CN103060658A (en) * 2013-01-22 2013-04-24 徐州金石彭源稀土材料厂 Preparation process for sintering 1kg-5.5kg of neodymium iron boron permanent magnetic material
DE102012222224A1 (en) * 2012-12-04 2014-06-05 SUMIDA Components & Modules GmbH Magnetic cores and process for their preparation
CN106158216A (en) * 2015-03-26 2016-11-23 南通华兴磁性材料有限公司 The formula of a kind of permanent magnetism material and preparation technology thereof
CN106229104A (en) * 2016-08-31 2016-12-14 北京康普锡威科技有限公司 A kind of soft magnetic composite powder and preparation process for magnetic powder core thereof
CN106504846A (en) * 2016-12-30 2017-03-15 江西艾特磁材有限公司 A kind of ferrum ferrosilicon oxysome composite cores and preparation method thereof
CN106587974A (en) * 2016-12-23 2017-04-26 湖南航天磁电有限责任公司 Method for increasing residual magnetism of permanent magnetic ferrite based on dry-pressing powder molding
CN107032798A (en) * 2017-05-31 2017-08-11 清华大学 A kind of preparation method of the porous ceramic film material based on photocureable rapid shaping
CN108885938A (en) * 2016-03-25 2018-11-23 日立金属株式会社 MnZn FERRITE CORE and preparation method thereof
CN110835269A (en) * 2019-10-30 2020-02-25 安徽朗基新材料科技有限公司 Production process of high-strength high-performance soft magnetic ferrite material
CN110835261A (en) * 2019-10-30 2020-02-25 安徽朗基新材料科技有限公司 Preparation method of high-resistivity soft magnetic ferrite material
CN111161935A (en) * 2018-11-07 2020-05-15 山东精创磁电产业技术研究院有限公司 Sintering method of soft magnetic composite material with high strength, high magnetic conductivity and high saturation magnetic flux density

Patent Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05285590A (en) * 1992-04-14 1993-11-02 Ube Ind Ltd Production of sand core
CN1812943A (en) * 2003-06-06 2006-08-02 豪富公司 Multi-layer fire barrier systems
CN1623953A (en) * 2003-12-01 2005-06-08 浙江天通电子股份有限公司 Manganese zinc ferrite soft magnetic sinitering method
CN101089108A (en) * 2007-05-17 2007-12-19 钢铁研究总院 Inorganic insulating adhesive for soft magentic metal powder core andits prepn process
CN101236829A (en) * 2007-12-07 2008-08-06 广东风华高新科技股份有限公司 A making method for magnetic core of Mn-Zn soft magnetic ferrite
DE102012222224A1 (en) * 2012-12-04 2014-06-05 SUMIDA Components & Modules GmbH Magnetic cores and process for their preparation
CN103060658A (en) * 2013-01-22 2013-04-24 徐州金石彭源稀土材料厂 Preparation process for sintering 1kg-5.5kg of neodymium iron boron permanent magnetic material
CN106158216A (en) * 2015-03-26 2016-11-23 南通华兴磁性材料有限公司 The formula of a kind of permanent magnetism material and preparation technology thereof
CN108885938A (en) * 2016-03-25 2018-11-23 日立金属株式会社 MnZn FERRITE CORE and preparation method thereof
CN106229104A (en) * 2016-08-31 2016-12-14 北京康普锡威科技有限公司 A kind of soft magnetic composite powder and preparation process for magnetic powder core thereof
CN106587974A (en) * 2016-12-23 2017-04-26 湖南航天磁电有限责任公司 Method for increasing residual magnetism of permanent magnetic ferrite based on dry-pressing powder molding
CN106504846A (en) * 2016-12-30 2017-03-15 江西艾特磁材有限公司 A kind of ferrum ferrosilicon oxysome composite cores and preparation method thereof
CN107032798A (en) * 2017-05-31 2017-08-11 清华大学 A kind of preparation method of the porous ceramic film material based on photocureable rapid shaping
CN111161935A (en) * 2018-11-07 2020-05-15 山东精创磁电产业技术研究院有限公司 Sintering method of soft magnetic composite material with high strength, high magnetic conductivity and high saturation magnetic flux density
CN110835269A (en) * 2019-10-30 2020-02-25 安徽朗基新材料科技有限公司 Production process of high-strength high-performance soft magnetic ferrite material
CN110835261A (en) * 2019-10-30 2020-02-25 安徽朗基新材料科技有限公司 Preparation method of high-resistivity soft magnetic ferrite material

Also Published As

Publication number Publication date
CN111777419B (en) 2022-05-31

Similar Documents

Publication Publication Date Title
CN109851344A (en) A kind of preparation process of high-performance nickel-zinc-ferrite material
CN112951579A (en) Heat treatment method for residual magnetism of iron-based nanocrystalline magnetic core
CN102129907B (en) Nanocrystalline soft magnetic alloy iron core with high initial permeability and low remanence and preparation method thereof
CN103440950B (en) A kind of in-situ preparation method of powder core
CN115340373B (en) Preparation method of hexagonal ferrite material based on low-purity iron concentrate raw material system
CN103725951B (en) A kind of microwave sintering prepares the method for nano crystal soft magnetic material
CN112408970A (en) High-frequency wide-temperature low-loss soft magnetic ferrite material and preparation method thereof
CN105336492A (en) Surface insulation treating method adopting boric acid as reactant to reduce sendust core loss
CN111777419B (en) Sintering process of magnetic ferrite core
CN117612818A (en) Nanocrystalline mixed magnetic powder core for molded inductor and preparation method thereof
CN110835261B (en) Preparation method of high-resistivity soft magnetic ferrite material
CN102543345A (en) Low power consumption Fe-Si-Al alloy material with magnetic conductivity mu=26 and preparation method thereof
CN102962465A (en) Low-permeability, low-power consumption Fe-Si-Al soft magnetic material and production method thereof
CN1050108A (en) Making method of cutting amorphous inductive magnetic core
CN112430081A (en) High-saturation-flux-density soft magnetic ferrite material and preparation method thereof
CN114573334B (en) High-power high-Curie-temperature low-linewidth garnet ferrite and preparation method thereof
CN107739785B (en) A kind of idle call stator core heat treatment process
CN114496544A (en) Method for manufacturing low-power-consumption iron-nickel-molybdenum magnetic powder core
CN114477986A (en) High-performance manganese-zinc soft magnetic ferrite material and preparation method thereof
CN103680917A (en) Manufacturing method for nanocrystalline magnetic core for high-frequency electronic transformer
CN106653344A (en) Preparation method of soft magnetic core of high silicon steel for medium and high frequency
CN106169349A (en) A kind of stable ferrite core material
CN105461296A (en) A high-BS low-loss manganese zinc ferrite magnetic material and a preparing method thereof
CN110957123A (en) Method for preparing iron-nickel soft magnetic powder core with magnetic conductivity of 125
CN111875369A (en) Preparation method of corrosion-resistant magnetic ferrite core

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant