CN106242598A - Inner liner of rotary kiln brick, liner composite brick and manufacture method thereof - Google Patents

Inner liner of rotary kiln brick, liner composite brick and manufacture method thereof Download PDF

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Publication number
CN106242598A
CN106242598A CN201610638357.1A CN201610638357A CN106242598A CN 106242598 A CN106242598 A CN 106242598A CN 201610638357 A CN201610638357 A CN 201610638357A CN 106242598 A CN106242598 A CN 106242598A
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rotary kiln
inner liner
brick
liner
manufacture method
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CN106242598B (en
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李兴
程国建
杜春天
谭春凡
甘乐才
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Chongqing Iron And Steel Group Mining Co Ltd Metallurgical Material Factory
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Chongqing Iron And Steel Group Mining Co Ltd Metallurgical Material Factory
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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
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
    • 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
    • C04B33/00—Clay-wares
    • C04B33/02—Preparing or treating the raw materials individually or as batches
    • C04B33/13—Compounding ingredients
    • C04B33/132—Waste materials; Refuse; Residues
    • C04B33/135—Combustion residues, e.g. fly ash, incineration waste
    • C04B33/1352—Fuel ashes, e.g. fly ash
    • 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
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/16—Shaped 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 silicates other than clay
    • C04B35/18—Shaped 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 silicates other than clay rich in aluminium oxide
    • C04B35/185—Mullite 3Al2O3-2SiO2
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
    • F27B7/28—Arrangements of linings
    • 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
    • C04B2235/349—Clays, e.g. bentonites, smectites such as montmorillonite, vermiculites or kaolines, e.g. illite, talc or sepiolite
    • 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
    • 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
    • C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
    • C04B2235/9623—Ceramic setters properties
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Environmental & Geological Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

The invention discloses a kind of inner liner of rotary kiln brick, liner composite brick and manufacture method, inner liner of rotary kiln brick, include by mass percentage: the bauxite of 25%, the M45 mullite of 58% and the clay of 17%；The manufacture method of inner liner of rotary kiln brick, comprises the following steps: 1) grind altogether after bauxite, clay mixing, 2) powder after common mill is sent into Wet wheel roller mixed grind etc. with M45 mullite；Inner liner of rotary kiln composite brick, including heavy layer and be positioned at the light layer above heavy layer；The manufacture method of inner liner of rotary kiln composite brick, comprises the following steps: 1) heavy layer material and light layer material are respectively fed to Wet wheel roller mixed grind etc..Its liner tile alkaline erosion performance obtained of the present invention is good, and its thermal shock resistance and wearability also have bigger improvement, and life of product is significantly improved；And the liner tile obtained can effectively reduce kiln shell temperature, reduce heat loss, reduce rotary kiln energy consumption, inner liner of rotary kiln weight, beneficially rotary kiln running can also be alleviated simultaneously.

Description

Inner liner of rotary kiln brick, liner composite brick and manufacture method thereof
Technical field
The present invention relates to rotary kiln technical field, particularly to inner lining material and the manufacture method thereof of a kind of rotary kiln.
Background technology
The most how large-sized rotary kiln, because of advantages such as its yield are big, it is stable to produce, product calcining is uniform, applies to industry In production, in addition to cement industry, active lime calcining, chromic salts roast, alkali-lime sinter process produce aluminium oxide etc. and all use large-scale Rotary kiln.
High-alumina brick selected mostly by inner liner of rotary kiln refractory material, in use due to by K2O、Na2The alkalescence such as O, CaO Material corrodes, and brick body can be caused to expand loose；Add common high-alumina brick and there is the defects such as thermal shock resistance peeling abrasion poor, easy, Making existing inner liner of rotary kiln clinkering zone service life mostly at 6-8 month, and brick body liner cannot use heat insulation layer, leads Causing kiln shell temperature higher, heat loss is bigger.
Summary of the invention
In view of this, it is an object of the invention to provide a kind of inner liner of rotary kiln brick, liner composite brick and manufacture method thereof, with Solve existing large-sized rotary kiln high-alumina brick liner in use because alkali erosion, thermal shock are peeled off and caused service life short and kiln The problem that shell temperature is high, heat loss is big.
Inner liner of rotary kiln brick of the present invention, includes by mass percentage: the bauxite of 25%, the M45 mullite of 58%, with And the clay of 17%.
The invention also discloses the manufacture method of a kind of inner liner of rotary kiln brick, comprise the following steps:
1) grind altogether in flour mill after bauxite and clay being mixed；
2) powder prepared through flour mill is added Wet wheel roller mixed grind with M45 mullite；
3) compound prepared through Wet wheel roller mixed grind is sent into 630t press to suppress, prepare inner liner of rotary kiln brick Base；
4) adobe is put in tunnel cave, at 1410 DEG C, fire 8h prepare inner liner of rotary kiln brick.In inner liner of rotary kiln brick Include by mass percentage: the bauxite of 25%, the M45 mullite of 58% and the clay of 17%.
The invention also discloses a kind of inner liner of rotary kiln composite brick, including heavy layer be positioned at the lightweight above heavy layer Layer, described heavy layer includes by mass percentage: bauxite 25%, M45 mullite 58% and clay 17%, described gently Matter layer includes by mass percentage: floating bead 20%, light-weight mullite 60% and clay 20%.
Further, the faying face of described heavy layer and light layer is zigzag.
The invention also discloses the manufacture method of a kind of inner liner of rotary kiln composite brick, comprise the following steps:
1) heavy layer material and light layer material are respectively fed to Wet wheel roller mixed grind；
2) heavy layer material and the light layer material of mixed grind gained are sequentially placed in compacting tool set by ormal weight, at 630T Under press effect, compacting obtains adobe；
3) adobe is put in kiln, at 1410 DEG C, fire 8h prepare inner liner of rotary kiln brick.
Beneficial effects of the present invention:
Inner liner of rotary kiln brick of the present invention, liner composite brick and manufacture method thereof, its liner tile alkaline erosion performance obtained Being substantially better than the high-alumina brick that current rotary kiln uses, its thermal shock resistance and wearability also have bigger improvement, and life of product has bright Aobvious raising；And the liner tile obtained can effectively reduce kiln shell temperature, reduce heat loss, reduce rotary kiln energy consumption, simultaneously can also Alleviate inner liner of rotary kiln weight, beneficially rotary kiln running.
Accompanying drawing explanation
Fig. 1 is the structural representation of inner liner of rotary kiln composite brick；
Fig. 2 is the sectional structure schematic diagram in Fig. 1 along A-A.
Detailed description of the invention
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
Embodiment one: the present embodiment inner liner of rotary kiln brick, includes by mass percentage: the bauxite of 25%, 58% M45 mullite and the clay of 17%.
In the present embodiment, by mass percentage, the bauxite in heavy layer contains the Al of 54.8%2O3, and 2.46% Fe2O3；M45 mullite in heavy layer contains the Al of 45.4%2O3, and the Fe of 1.03%2O3；In clay in heavy layer Containing the Al of 28.3%2O3, and the Fe of 1.43%2O3。
Embodiment two: the manufacture method of inner liner of rotary kiln brick in embodiment one, comprises the following steps:
1) grind altogether in flour mill after bauxite and clay being mixed；
2) powder prepared through flour mill is added Wet wheel roller mixed grind with M45 mullite；
3) compound prepared through Wet wheel roller mixed grind is sent into 630t press to suppress, prepare inner liner of rotary kiln brick Base；
4) adobe is put in tunnel cave, at 1410 DEG C, fire 8h prepare inner liner of rotary kiln brick；In inner liner of rotary kiln brick Include by mass percentage: the bauxite of 25%, the M45 mullite of 58% and the clay of 17%.
Following table is to use the physical and chemical parameter of the inner liner of rotary kiln brick that manufacture method prepares in embodiment two:
Choose the liner tile obtained in LZ-75 high-alumina brick, common brick and the embodiment two used on rotary kiln and do resistance to Alkali contrast experiment, Na2S does alkaline etching agent, uses molten alkali crucible method to make alkali resistance and measures, drills through φ 22mm respectively on three kinds of goods The hole of × 25mm, adds a certain amount of Na in hole2S, and 50mm × 50mm × 6mm lid in upper cover, be at the uniform velocity warming up to 1100 DEG C, it is incubated 5h, evaluates its alkaline resistance properties after natural cooling, its experimental result such as following table.
Embodiment three: the present embodiment inner liner of rotary kiln composite brick, including heavy layer 1 be positioned at the light layer above heavy layer 2, described heavy layer includes by mass percentage: bauxite 25%, M45 mullite 58% and clay 17%, described lightweight Layer includes by mass percentage: floating bead 20%, light-weight mullite 60% and clay 20%.
In the present embodiment, by mass percentage, the bauxite in heavy layer contains the Al of 54.8%2O3, and 2.46% Fe2O3；M45 mullite in heavy layer contains the Al of 45.4%2O3, and the Fe of 1.03%2O3；In clay in heavy layer Containing the Al of 28.3%2O3, and the Fe of 1.43%2O3。
In the present embodiment, by mass percentage, the light-weight mullite in light layer contains the Al of 65.8%2O3, 28.6% SiO2, and the Fe of 2.3%2O3；Floating bead in light layer contains the Al of 26.8%2O3, the SiO of 63.7%2, and 3.5% Fe2O3。
Further, the faying face of heavy layer described in the present embodiment and light layer is zigzag, and bond strength is higher.
Embodiment four: the manufacture method of inner liner of rotary kiln composite brick in embodiment three, comprises the following steps:
1) heavy layer material and light layer material are respectively fed to Wet wheel roller mixed grind；
2) heavy layer material and the light layer material of mixed grind gained are sequentially placed in compacting tool set by ormal weight, at 630T Under press effect, compacting obtains adobe；
3) adobe is put in kiln, at 1410 DEG C, fire 8h prepare inner liner of rotary kiln brick.
The thermal conductivity of its heavy layer of inner liner of rotary kiln composite brick obtained in embodiment four is 1.6w/m.k, light layer Thermal conductivity is 0.851.6w/m.k；By the inner liner of rotary kiln composite brick in the present embodiment at 4.5m × 90m aluminium oxide and activity stone Using on ash calcination rotary kiln, its clinkering zone is brought up to present 16 months for about 8 months by original high-alumina brick service life Above, kiln shell temperature is reduced to about 250 DEG C by original about 300 DEG C, and cooling-down effect is obvious.
Understanding in sum, the inner liner of rotary kiln brick in the embodiment of the present invention and liner composite brick, its alkali erosiveness can be bright Showing and be better than the high-alumina brick that current rotary kiln uses, its thermal shock resistance and wearability also have bigger improvement, and life of product has substantially Improve；And the liner tile obtained can effectively reduce kiln shell temperature, reduce heat loss, reduce rotary kiln energy consumption, can also subtract simultaneously Light inner liner of rotary kiln weight, beneficially rotary kiln running.
Finally illustrating, above example is only in order to illustrate technical scheme and unrestricted, although with reference to relatively The present invention has been described in detail by good embodiment, it will be understood by those within the art that, can be to the skill of the present invention Art scheme is modified or equivalent, and without deviating from objective and the scope of technical solution of the present invention, it all should be contained at this In the middle of the right of invention.

Claims (5)

1. an inner liner of rotary kiln brick, it is characterised in that: include by mass percentage: the bauxite of 25%, the M45 of 58% are not Carry out the clay of stone and 17%.
The manufacture method of inner liner of rotary kiln brick the most according to claim 1, it is characterised in that: comprise the following steps:
1) grind altogether in flour mill after bauxite and clay being mixed；
2) powder prepared through flour mill is added Wet wheel roller mixed grind with M45 mullite；
3) compound prepared through Wet wheel roller mixed grind is sent into 630t press to suppress, prepare inner liner of rotary kiln adobe；
4) adobe is put in tunnel cave, at 1410 DEG C, fire 8h prepare inner liner of rotary kiln brick.
3. an inner liner of rotary kiln composite brick, it is characterised in that: include heavy layer and be positioned at the light layer above heavy layer, described Heavy layer includes by mass percentage: bauxite 25%, M45 mullite 58% and clay 17%, and described light layer presses matter Amount percentages includes: floating bead 20%, light-weight mullite 60% and clay 20%.
Inner liner of rotary kiln brick the most according to claim 3, it is characterised in that: the faying face of described heavy layer and light layer is Zigzag.
5. the manufacture method of inner liner of rotary kiln composite brick in a claim 3, it is characterised in that: comprise the following steps:
1) heavy layer material and light layer material are respectively fed to Wet wheel roller mixed grind；
2) heavy layer material and the light layer material of mixed grind gained are sequentially placed in compacting tool set by ormal weight, at 630T press The lower compacting of effect obtains adobe；
3) adobe is put in kiln, at 1410 DEG C, fire 8h prepare inner liner of rotary kiln brick.
CN201610638357.1A 2016-08-05 2016-08-05 Inner liner of rotary kiln brick, liner composite brick and its manufacturing method Active CN106242598B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109579539A (en) * 2018-11-26 2019-04-05 山东耐材集团鲁耐窑业有限公司 Aluminous fly-ash extracts alumina slurry calcination rotary kiln intermediate zone high-strength alkaline-resisting composite brick and preparation method thereof
CN113956054A (en) * 2021-10-12 2022-01-21 佛山市天禄智能装备科技有限公司 Heat-insulating refractory material for rotary kiln and preparation method thereof
CN115093230A (en) * 2022-06-14 2022-09-23 山东华恩新材料科技有限公司 Boron carbide bulletproof ceramic with radar stealth performance and preparation method thereof

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1693288A (en) * 2005-05-12 2005-11-09 符宗德 Mullite composite brick for basic rotary kiln
CN102235820A (en) * 2011-07-26 2011-11-09 浙江大学 Lining structure of rotary kiln
CN102659421A (en) * 2012-03-31 2012-09-12 马钢(集团)控股有限公司 Production method of mullite cast steel brick
CN102788497A (en) * 2012-09-07 2012-11-21 厚波 Special composite firebrick for rotary kiln and preparation method thereof
CN103058685A (en) * 2013-01-25 2013-04-24 苏州罗卡节能科技有限公司 Medium-density silicon mullite brick used for rotary kiln and preparation method thereof
CN103234346A (en) * 2013-05-10 2013-08-07 郑州瑞泰耐火科技有限公司 Low-heat-conduction multi-layer mullite brick and preparation method thereof
CN103819206A (en) * 2013-11-29 2014-05-28 浙江瑞泰耐火材料科技有限公司 Zirconium mullite red brick and preparation technology thereof

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1693288A (en) * 2005-05-12 2005-11-09 符宗德 Mullite composite brick for basic rotary kiln
CN102235820A (en) * 2011-07-26 2011-11-09 浙江大学 Lining structure of rotary kiln
CN102659421A (en) * 2012-03-31 2012-09-12 马钢(集团)控股有限公司 Production method of mullite cast steel brick
CN102788497A (en) * 2012-09-07 2012-11-21 厚波 Special composite firebrick for rotary kiln and preparation method thereof
CN103058685A (en) * 2013-01-25 2013-04-24 苏州罗卡节能科技有限公司 Medium-density silicon mullite brick used for rotary kiln and preparation method thereof
CN103234346A (en) * 2013-05-10 2013-08-07 郑州瑞泰耐火科技有限公司 Low-heat-conduction multi-layer mullite brick and preparation method thereof
CN103819206A (en) * 2013-11-29 2014-05-28 浙江瑞泰耐火材料科技有限公司 Zirconium mullite red brick and preparation technology thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109579539A (en) * 2018-11-26 2019-04-05 山东耐材集团鲁耐窑业有限公司 Aluminous fly-ash extracts alumina slurry calcination rotary kiln intermediate zone high-strength alkaline-resisting composite brick and preparation method thereof
CN113956054A (en) * 2021-10-12 2022-01-21 佛山市天禄智能装备科技有限公司 Heat-insulating refractory material for rotary kiln and preparation method thereof
CN113956054B (en) * 2021-10-12 2023-10-20 佛山市天禄智能装备科技有限公司 Heat-insulating refractory material for rotary kiln and preparation method thereof
CN115093230A (en) * 2022-06-14 2022-09-23 山东华恩新材料科技有限公司 Boron carbide bulletproof ceramic with radar stealth performance and preparation method thereof

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