RU2014138117A - Керамический материал для антенного обтекателя, антенный обтекатель и способ его изготовления - Google Patents

Керамический материал для антенного обтекателя, антенный обтекатель и способ его изготовления Download PDF

Info

Publication number
RU2014138117A
RU2014138117A RU2014138117A RU2014138117A RU2014138117A RU 2014138117 A RU2014138117 A RU 2014138117A RU 2014138117 A RU2014138117 A RU 2014138117A RU 2014138117 A RU2014138117 A RU 2014138117A RU 2014138117 A RU2014138117 A RU 2014138117A
Authority
RU
Russia
Prior art keywords
finished product
semi
ceramic material
mixture
antenna
Prior art date
Application number
RU2014138117A
Other languages
English (en)
Other versions
RU2584427C2 (ru
Inventor
МАРТИНО Даниела ДИ
Шити ДИЛЕТТА
Лаура ЭСПОЗИТО
Original Assignee
Мбда Италия С.П.А.
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 Мбда Италия С.П.А. filed Critical Мбда Италия С.П.А.
Publication of RU2014138117A publication Critical patent/RU2014138117A/ru
Application granted granted Critical
Publication of RU2584427C2 publication Critical patent/RU2584427C2/ru

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
    • 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
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
    • C04B35/58—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides
    • C04B35/584—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on silicon nitride
    • 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
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
    • C04B35/58—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides
    • C04B35/584—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on silicon nitride
    • C04B35/587—Fine ceramics
    • 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
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
    • C04B35/632—Organic additives
    • C04B35/634—Polymers
    • C04B35/63448—Polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B35/63488—Polyethers, e.g. alkylphenol polyglycolether, polyethylene glycol [PEG], polyethylene oxide [PEO]
    • 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
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
    • C04B35/638—Removal thereof
    • 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
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/64—Burning or sintering processes
    • 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
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/64—Burning or sintering processes
    • C04B35/645—Pressure sintering
    • 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
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/0072—Heat treatment
    • 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
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
    • C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
    • 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
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
    • 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
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3418—Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
    • 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
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/38—Non-oxide ceramic constituents or additives
    • C04B2235/3852—Nitrides, e.g. oxynitrides, carbonitrides, oxycarbonitrides, lithium nitride, magnesium nitride
    • C04B2235/3873—Silicon nitrides, e.g. silicon carbonitride, silicon oxynitride
    • 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
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
    • C04B2235/604—Pressing at temperatures other than sintering temperatures
    • 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
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
    • C04B2235/612—Machining
    • 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
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
    • C04B2235/656—Aspects 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
    • C04B2235/6562—Heating rate
    • 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
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
    • C04B2235/656—Aspects 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
    • C04B2235/6567—Treatment time
    • 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
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
    • C04B2235/66—Specific sintering techniques, e.g. centrifugal sintering
    • C04B2235/661—Multi-step sintering
    • 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
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/74—Physical characteristics
    • C04B2235/76—Crystal structural characteristics, e.g. symmetry
    • C04B2235/767—Hexagonal symmetry, e.g. beta-Si3N4, beta-Sialon, alpha-SiC or hexa-ferrites
    • 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
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/74—Physical characteristics
    • C04B2235/77—Density
    • 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
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/80—Phases present in the sintered or melt-cast ceramic products other than the main phase
    • 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
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/94—Products characterised by their shape
    • 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
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
    • C04B2235/9646—Optical properties
    • C04B2235/9653—Translucent or transparent ceramics other than alumina
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/28—Adaptation for use in or on aircraft, missiles, satellites, or balloons

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Ceramic Products (AREA)
  • Details Of Aerials (AREA)

Abstract

1. Керамический материал для антенного обтекателя, содержащий:- около 90-94% (% масс.) SiN; и- около 6-10% (% масс.) алюмосиликатов магния, включающих 3,2-5,2% (% масс.) SiO, 0,7-2% (% масс.) MgO и 2,1-4% (% масс.) AlO;имеющий плотность не ниже 2,5 г/сми диэлектрическую проницаемость не более 6,5.2. Керамический материал по п. 1, в котором указанная плотность составляет от 2,5 до 2,9 г/сми/или указанная диэлектрическая проницаемость составляет от 5,7 до 6,4.3. Керамический материал по п. 1, в котором 15-35% (% масс.) SiNпредставляет собой β-SiN.4. Керамический материал по любому из пп. 1-3, содержащий 90% (% масс.) SiN; 5,1% (% масс.) SiO, 1,4% (% масс.) MgO и 3,5% (% масс.) AlO.5. Антенный обтекатель, содержащий керамический материал по любому из пп. 1-4.6. Способ изготовления антенного обтекателя, включающий следующие стадии:a. формирования гомогенной смеси из около 80-95% (% масс.) порошка SiNи около 5-15% (% масс.) порошка алюмосиликатов магния, включающих 2,5-12,5% (% масс.) SiO, 0,5-3% (% масс.) MgO и 2-6% (% масс.) AlO;b. добавления по меньшей мере одного органического связующего к смеси;c. распыления смеси;d. проведения изостатического прессования смеси при температуре окружающей среды в специальной пресс-форме так, чтобы сформировать сырой полуфабрикат;e. механической обработки сырого полуфабриката для придания ему по существу окончательной формы;f. подвергания формованного сырого полуфабриката термическому циклу;g. спекания сырого полуфабриката так, чтобы получить готовый продукт.7. Способ изготовления антенного обтекателя по п. 6, в котором стадия а формирования гомогенной смеси включает следующие два подэтапа:а′. смешивания SiNс SiOдля формирования предварительной смеси;а″. смешивания предварительной смеси с MgO и AlO.8. Способ изготовления антенного обтекателя по п. 6 или 7, в котором стадия f подвергания полуфабриката термическому циклу, включает следующие подэта

Claims (11)

1. Керамический материал для антенного обтекателя, содержащий:
- около 90-94% (% масс.) Si3N4; и
- около 6-10% (% масс.) алюмосиликатов магния, включающих 3,2-5,2% (% масс.) SiO2, 0,7-2% (% масс.) MgO и 2,1-4% (% масс.) Al2O3;
имеющий плотность не ниже 2,5 г/см3 и диэлектрическую проницаемость не более 6,5.
2. Керамический материал по п. 1, в котором указанная плотность составляет от 2,5 до 2,9 г/см3 и/или указанная диэлектрическая проницаемость составляет от 5,7 до 6,4.
3. Керамический материал по п. 1, в котором 15-35% (% масс.) Si3N4 представляет собой β-Si3N4.
4. Керамический материал по любому из пп. 1-3, содержащий 90% (% масс.) Si3N4; 5,1% (% масс.) SiO2, 1,4% (% масс.) MgO и 3,5% (% масс.) Al2O3.
5. Антенный обтекатель, содержащий керамический материал по любому из пп. 1-4.
6. Способ изготовления антенного обтекателя, включающий следующие стадии:
a. формирования гомогенной смеси из около 80-95% (% масс.) порошка Si3N4 и около 5-15% (% масс.) порошка алюмосиликатов магния, включающих 2,5-12,5% (% масс.) SiO2, 0,5-3% (% масс.) MgO и 2-6% (% масс.) Al2O3;
b. добавления по меньшей мере одного органического связующего к смеси;
c. распыления смеси;
d. проведения изостатического прессования смеси при температуре окружающей среды в специальной пресс-форме так, чтобы сформировать сырой полуфабрикат;
e. механической обработки сырого полуфабриката для придания ему по существу окончательной формы;
f. подвергания формованного сырого полуфабриката термическому циклу;
g. спекания сырого полуфабриката так, чтобы получить готовый продукт.
7. Способ изготовления антенного обтекателя по п. 6, в котором стадия а формирования гомогенной смеси включает следующие два подэтапа:
а′. смешивания Si3N4 с SiO2 для формирования предварительной смеси;
а″. смешивания предварительной смеси с MgO и Al2O3.
8. Способ изготовления антенного обтекателя по п. 6 или 7, в котором стадия f подвергания полуфабриката термическому циклу, включает следующие подэтапы:
f. повышения температуры со скоростью 8°C/час до достижения температуры 300-390°C;
f′. выдерживания полуфабриката при указанной температуре в течение 3-6 часов.
9. Способ изготовления антенного обтекателя по п. 6, в котором стадию f подвергания полуфабриката термическому циклу проводят в печи, которая содержит опору и/или систему подачи газов такие, чтобы обеспечить удаление из заготовки органического связующего.
10. Способ изготовления антенного обтекателя по п. 6, в котором стадию g спекания проводят на опоре, изготовленной из того же материала, что и полуфабрикат.
11. Способ изготовления обтекателя по п. 6, в котором указанная смесь содержит:
- около 90-94% (% масс.) Si3N4; и
- около 6-10% (% масс.) алюмосиликатов магния, включающих 3,2-5,2% (% масс.) SiO2, 0,7-2% (% масс.) MgO и 2,1-4% (% масс.) Al2O3.
RU2014138117/03A 2012-02-22 2012-02-22 Керамический материал для антенного обтекателя, антенный обтекатель и способ его изготовления RU2584427C2 (ru)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2012/000052 WO2013124871A1 (en) 2012-02-22 2012-02-22 Ceramic material for radome, radome and process for the production thereof

Publications (2)

Publication Number Publication Date
RU2014138117A true RU2014138117A (ru) 2016-04-10
RU2584427C2 RU2584427C2 (ru) 2016-05-20

Family

ID=46085109

Family Applications (1)

Application Number Title Priority Date Filing Date
RU2014138117/03A RU2584427C2 (ru) 2012-02-22 2012-02-22 Керамический материал для антенного обтекателя, антенный обтекатель и способ его изготовления

Country Status (7)

Country Link
US (2) US9403724B2 (ru)
EP (1) EP2817273B1 (ru)
JP (1) JP5968470B2 (ru)
CN (1) CN104302600B (ru)
ES (1) ES2611907T3 (ru)
RU (1) RU2584427C2 (ru)
WO (1) WO2013124871A1 (ru)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109608204A (zh) * 2019-01-31 2019-04-12 山东工业陶瓷研究设计院有限公司 一种高硬度Si3N4陶瓷天线罩高效精密加工制备方法
CN112408990B (zh) * 2019-08-20 2023-05-02 山东工业陶瓷研究设计院有限公司 与红外材料性能匹配的陶瓷透波材料、天线罩及制备方法
WO2021054908A1 (en) 2019-09-20 2021-03-25 Aselsan Elektroni̇k Sanayi̇ Ve Ti̇caret Anoni̇m Şi̇rketi̇ Fabrication method of functionally-graded structures by continuous ceramic filaments
IT202100032696A1 (it) 2021-12-27 2023-06-27 Mbda italia spa Unità di controllo elettronico di un dispositivo servoassistito di ricezione e/o trasmissione e/o riflessione di radiazioni elettromagnetiche

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4677443A (en) * 1979-01-26 1987-06-30 The Boeing Company Broadband high temperature radome apparatus
US4542109A (en) 1983-08-09 1985-09-17 Gte Laboratories Incorporated Silicon nitride-cordierite ceramic article, and process of manufacture thereof
JPS61201667A (ja) * 1985-03-05 1986-09-06 住友電気工業株式会社 窒化珪素質セラミツクスの製造方法
US4654315A (en) * 1985-04-08 1987-03-31 Gte Products Corporation Low dielectric loss silicon nitride based material
US4642299A (en) * 1985-04-08 1987-02-10 Gte Products Corporation Silicon nitride having low dielectric loss
US5034356A (en) * 1989-08-07 1991-07-23 General Electric Company Ceramic matrix composite
US5023215A (en) * 1989-10-26 1991-06-11 Gte Products Corporation Cordierite-silicon nitride body
US5156830A (en) 1990-07-24 1992-10-20 Eaton Corporation Process for preparing an alpha-phase silicon nitride material and thereafter converting to non-densified beta-phase material
RU2028997C1 (ru) * 1991-02-25 1995-02-20 Институт структурной макрокинетики РАН Способ изготовления спеченных изделий из нитрида кремния
US5376602A (en) * 1993-12-23 1994-12-27 The Dow Chemical Company Low temperature, pressureless sintering of silicon nitride
JPH1013129A (ja) 1996-06-25 1998-01-16 Sumitomo Electric Ind Ltd レドーム
CN1331812C (zh) * 2006-02-24 2007-08-15 中国科学院上海硅酸盐研究所 高强度、低介电常数的二氧化硅结合的氮化硅多孔陶瓷及制备方法
CN101239826A (zh) * 2008-03-03 2008-08-13 南京航空航天大学 一种氮化硅透波材料的制备方法
CN101407420B (zh) * 2008-11-04 2011-06-22 西安交通大学 一种基于碳热还原制备无晶界相多孔氮化硅陶瓷的方法
CN102285799B (zh) * 2011-06-09 2013-01-02 郑州大学 新型透波隔热功能一体化SiO2-Si3N4复合材料及其制备方法

Also Published As

Publication number Publication date
ES2611907T3 (es) 2017-05-11
US9673518B2 (en) 2017-06-06
US20160315381A1 (en) 2016-10-27
CN104302600A (zh) 2015-01-21
EP2817273B1 (en) 2016-10-26
WO2013124871A1 (en) 2013-08-29
EP2817273A1 (en) 2014-12-31
US9403724B2 (en) 2016-08-02
JP2015514657A (ja) 2015-05-21
RU2584427C2 (ru) 2016-05-20
US20150099619A1 (en) 2015-04-09
JP5968470B2 (ja) 2016-08-10
CN104302600B (zh) 2016-10-12

Similar Documents

Publication Publication Date Title
CN104211444B (zh) 窑变高粱红花釉的制备方法
CN102173873B (zh) 一种窑变釉料及其施釉工艺
CN107042309B (zh) 一种水溶性型芯部件及其制备方法
CN104261820B (zh) 氧化锆陶瓷插芯及其生产工艺
JP5661303B2 (ja) 低温焼成磁器用組成物および低温焼成磁器の製造方法
CN102775163B (zh) 一种碳化硅-堇青石复相陶瓷窑具及其制备方法
RU2014138117A (ru) Керамический материал для антенного обтекателя, антенный обтекатель и способ его изготовления
CN105693207B (zh) 一种茶叶末艺术瓷的制备方法
CN104016710B (zh) 轻质保温混凝土砌块及其制备方法
CN103664014B (zh) 白色硫铝酸盐水泥及其制备方法
CN104355629B (zh) 一种耐火材料及其制作方法
MX2023006513A (es) Metodo para fabricar un articulo refractario.
CN102503143A (zh) 含纳米氧化钇的熔融石英陶瓷材料的制备方法
CN105367097A (zh) 一种新型耐火砖的制备方法
CN105732015B (zh) 一种家用陶瓷开关面板及其制作工艺
CN106587963A (zh) 一种膨胀系数小的高强度陶瓷及其制备方法
CN102503468B (zh) 一种添加单质硅并氮化烧成的高铝预制件及其制备方法
CN107586037B (zh) 一种钧瓷釉料及其制备方法
CN104829248A (zh) 耐火砖
CN101182243A (zh) 一种夜光陶瓷及其生产工艺
CN105384451A (zh) 冰裂纹釉精密陶瓷珠宝饰品的制作工艺
US9840441B2 (en) Composition for producing a shaped refractory ceramic product, a method for producing a shaped refractory ceramic product, and a shaped refractory ceramic product
CN105541297A (zh) 一种瓷器的生产工艺
CN110483025A (zh) 防水用熔融石英砂陶瓷的制备方法
CN108610004A (zh) 大型坭兴陶的烧制方法

Legal Events

Date Code Title Description
MM4A The patent is invalid due to non-payment of fees

Effective date: 20200223