CN115490534B - 一种mim连续烧结炉用氧化铝承烧板及其制备方法 - Google Patents

一种mim连续烧结炉用氧化铝承烧板及其制备方法 Download PDF

Info

Publication number
CN115490534B
CN115490534B CN202211340864.9A CN202211340864A CN115490534B CN 115490534 B CN115490534 B CN 115490534B CN 202211340864 A CN202211340864 A CN 202211340864A CN 115490534 B CN115490534 B CN 115490534B
Authority
CN
China
Prior art keywords
alumina
mim
sintering furnace
green body
continuous sintering
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.)
Active
Application number
CN202211340864.9A
Other languages
English (en)
Other versions
CN115490534A (zh
Inventor
周会俊
王龙光
贾行远
陈风毅
陈子豪
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.)
Sinosteel Luoyang Institute of Refractories Research Co Ltd
Original Assignee
Sinosteel Luoyang Institute of Refractories Research 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 Sinosteel Luoyang Institute of Refractories Research Co Ltd filed Critical Sinosteel Luoyang Institute of Refractories Research Co Ltd
Priority to CN202211340864.9A priority Critical patent/CN115490534B/zh
Publication of CN115490534A publication Critical patent/CN115490534A/zh
Application granted granted Critical
Publication of CN115490534B publication Critical patent/CN115490534B/zh
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/06—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances
    • C04B38/063—Preparing or treating the raw materials individually or as batches
    • C04B38/0635—Compounding ingredients
    • C04B38/0645—Burnable, meltable, sublimable materials
    • C04B38/067—Macromolecular compounds
    • 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
    • C04B35/10—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 aluminium oxide
    • 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
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/71—Ceramic products containing macroscopic reinforcing agents
    • C04B35/78—Ceramic products containing macroscopic reinforcing agents containing non-metallic materials
    • C04B35/80—Fibres, filaments, whiskers, platelets, or the like
    • 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
    • C04B2235/3224—Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
    • C04B2235/3225—Yttrium oxide 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
    • C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
    • C04B2235/52—Constituents or additives characterised by their shapes
    • C04B2235/5208—Fibers
    • C04B2235/5216—Inorganic
    • C04B2235/522—Oxidic
    • C04B2235/5236—Zirconia
    • 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
    • C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
    • C04B2235/54—Particle size related information
    • C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
    • C04B2235/5436—Particle size related information expressed by the size of the particles or aggregates thereof micrometer sized, i.e. from 1 to 100 micron
    • 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
    • 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
    • C04B2235/9669—Resistance against chemicals, e.g. against molten glass or molten salts

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Furnace Charging Or Discharging (AREA)

Abstract

本发明属于氧化物陶瓷技术领域，涉及一种MIM连续烧结炉用氧化铝承烧板及其制备方法。涉及的一种MIM连续烧结炉用氧化铝承烧板的原料组成及质量比为：粒度≤320目的电熔白刚玉细粉60%～75%，氧化铝微粉15～25%，氧化钇微粉8～15%，外加氧化锆纤维5～10%，外加造孔剂4～8%，外加结合剂6～10%。本发明化学性质稳定，可用于还原气氛，且具有优良的抗侵蚀性，与高锰钢产品不发生粘连；轻质高强的承烧板具有较低的热容，节能降耗显著，降低了烧成成本。

Description

一种MIM连续烧结炉用氧化铝承烧板及其制备方法
技术领域
本发明属于氧化物陶瓷技术领域，具体涉及一种MIM连续烧结炉用氧化铝承烧板及其制备方法。
背景技术
MIM（金属注射成形）是一种针对生产中、小型复杂形状零件的现代化的近净形成形技术；经过20多年的发展，MIM产品的材料种类越来越多，在不同行业得到广泛应用；现在市场上的MIM烧结炉主要分为真空式的批次炉和气氛式的连续烧结炉；相比间歇性的真空炉，连续烧结炉具有生产效率高、生产成本低、操作简单、烧结质量稳定的优势；对于不锈钢MIM零件，真空炉烧结时通常使用99氧化铝质陶瓷板；然而，为了实现用分解氨气作为保护气气氛也可以生产出高密度的不锈钢零件，连续烧结炉安装有快速冷却装置,冷却速率达到1～4℃/S；99氧化铝质陶瓷板无法承受如此快的降温，往往用不了几次就发生开裂；刚玉-莫来石承烧板具有较好的抗热震性，然而在分解氨气（N2/H2）的环境下，莫来石易发生分解,生成气态的SiO逸出，造成承烧板结构疏松，产生脱砂，污染产品。且烧制高锰产品时，刚玉-莫来石承烧板易与产品发生粘连。
因此，有必要开发一种具有高温化学性质稳定、抗热震性好、高温强度优良的承烧板。
发明内容
本发明的目的在于提供一种高温化学性质稳定、抗热震性好、高温强度优良的用于MIM连续烧结炉用氧化铝承烧板及其制备方法。
为实现上述发明目的，本发明所采用的技术方案如下：
一种MIM连续烧结炉用氧化铝承烧板，氧化铝承烧板的原料组成及质量比为：粒度≤320目的电熔白刚玉细粉 60%～75%，氧化铝微粉 15～25%，氧化钇微粉8～15%，外加氧化锆纤维5～10%，外加造孔剂4～8%，外加结合剂6～10%。
所述的氧化铝微粉D50≤5um，氧化铝含量≥99%。
所述的氧化钇微粉D50≤5um，氧化钇含量≥99%。；
所述的造孔剂为PMMA微球、PS微球中的一种，粒径＜20um。
所述的结合剂是PVA和水溶性树脂其中一种水溶液。
一种MIM连续烧结炉用氧化铝承烧板的制备方法，包括如下步骤：
（1）混料：将按比例称取的各种原料倒入倾斜式混料机中充分造粒得到混合料；
（2）压制：将步骤1制备的混合料困料12小时后，称取一定的重量倒入模具中，以120～160Mpa的压力压制成生坯；
（3）干燥与烧结：生坯自然干燥12～24h后，转入电加热干燥箱100～150℃干燥6～12小时，使其中的水分充分挥发，然后放入高温电炉中在1600～1650℃温度下保温6～10h，自然冷却后得到氧化铝承烧板。
本发明一种MIM连续烧结炉用氧化铝承烧板及其制备方法，采用上述技术方案，具有如下有益效果：1.本发明使用的原料：电熔刚玉、氧化铝微粉、氧化钇微粉、氧化锆纤维等化学性质稳定，可用于还原气氛，且具有优良的抗侵蚀性，与高锰钢产品不发生粘连； 2.加入氧化钇微粉，高温下与氧化铝微粉反应生成高温强化相钇铝石榴石，钇铝石榴石具有极佳的抗蠕变性，钇铝石榴石穿插于刚玉相之间能够提高承烧板的高温蠕变性能和力学强度；3.造孔剂烧失后，在承烧板结构中留下大量10um的小气孔，承烧板的显气孔率达到40%以上，使MIM零件排胶通畅：4.添加氧化锆纤维，提高了承烧板的韧性，保证产品良好的抗热震性；5.轻质高强的承烧板具有较低的热容，节能降耗显著，降低了烧成成本。
具体实施方式
下面以具体实施实例进一步阐述本发明的技术方案，但并非仅仅局限于下述实施案例。
实施例1：
电熔白刚玉细粉≤320目 60%，氧化铝微粉 25%，氧化钇微粉15%，外加氧化锆纤维5%，造孔剂8%，结合剂10%。
工艺步骤如下：
（1）混料：将按比例称取的各种原料倒入倾斜式混料机中充分造粒得到混合料；
（2）压制：将步骤1制备的混合料困料12小时后，称取一定的重量倒入模具中，以160Mpa的压力压制成生坯；
（3）干燥与烧结：生坯自然干燥24h后，转入电加热干燥箱150℃干燥6小时，使其中的水分充分挥发，然后放入高温电炉中在1650℃温度下保温6h，自然冷却后得到氧化铝承烧板。
实施例2：
电熔白刚玉细粉≤320目 70%，氧化铝微粉 22%，氧化钇微粉8%，外加氧化锆纤维8%，造孔剂6%，结合剂8%。
工艺步骤如下：
（1）混料：将按比例称取的各种原料倒入倾斜式混料机中充分造粒得到混合料；
（2）压制：将步骤1制备的混合料困料12小时后，称取一定的重量倒入模具中，以140Mpa的压力压制成生坯；
（3）干燥与烧结：生坯自然干燥12～24h后，转入电加热干燥箱150℃干燥6小时，使其中的水分充分挥发，然后放入高温电炉中在1630℃温度下保温8h，自然冷却后得到氧化铝承烧板。
实施例3：
电熔白刚玉细粉≤320目 75%，氧化铝微粉 15%，氧化钇微粉10%，外加氧化锆纤维10%，造孔剂4%，结合剂6%。
工艺步骤如下：
（1）混料：将按比例称取的各种原料倒入倾斜式混料机中充分造粒得到混合料；
（2）压制：将步骤1制备的混合料困料12小时后，称取一定的重量倒入模具中，以120Mpa的压力压制成生坯；
（3）干燥与烧结：生坯自然干燥12后，转入电加热干燥箱130℃干燥8小时，使其中的水分充分挥发，然后放入高温电炉中在1600℃温度下保温10h，自然冷却后得到氧化铝承烧板。

Claims (3)

1.一种MIM连续烧结炉用氧化铝承烧板，其特征在于：氧化铝承烧板的原料组成及质量比为：粒度≤320目的电熔白刚玉细粉 60%～75%，氧化铝微粉 15～25%，氧化钇微粉8～15%，外加氧化锆纤维5～10%，外加造孔剂4～8%，外加结合剂6～10%；所述的造孔剂为PMMA微球、PS微球中的一种，粒径＜20μm；所述的结合剂是PVA和水溶性树脂其中的一种水溶液；一种MIM连续烧结炉用氧化铝承烧板的制备方法，包括如下步骤：
（1）混料：将按比例称取的各种原料倒入倾斜式混料机中充分造粒得到混合料；
（2）压制：将步骤（1）制备的混合料困料12小时后，称取一定的重量倒入模具中，以120～160MPa的压力压制成生坯；
（3）干燥与烧结：生坯自然干燥12～24h后，转入电加热干燥箱100～150℃干燥6～12小时，使其中的水分充分挥发，然后放入高温电炉中在1600～1650℃温度下保温6～10h，自然冷却后得到氧化铝承烧板。
2.如权利要求1所述的一种MIM连续烧结炉用氧化铝承烧板，其特征在于：所述的氧化铝微粉D50≤5μm，氧化铝含量≥99%。
3.如权利要求1所述的一种MIM连续烧结炉用氧化铝承烧板，其特征在于：所述的氧化钇微粉D50≤5μm，氧化钇含量≥99%。
CN202211340864.9A 2022-10-30 2022-10-30 一种mim连续烧结炉用氧化铝承烧板及其制备方法 Active CN115490534B (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211340864.9A CN115490534B (zh) 2022-10-30 2022-10-30 一种mim连续烧结炉用氧化铝承烧板及其制备方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211340864.9A CN115490534B (zh) 2022-10-30 2022-10-30 一种mim连续烧结炉用氧化铝承烧板及其制备方法

Publications (2)

Publication Number Publication Date
CN115490534A CN115490534A (zh) 2022-12-20
CN115490534B true CN115490534B (zh) 2023-09-19

Family

ID=85115237

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211340864.9A Active CN115490534B (zh) 2022-10-30 2022-10-30 一种mim连续烧结炉用氧化铝承烧板及其制备方法

Country Status (1)

Country Link
CN (1) CN115490534B (zh)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000328105A (ja) * 1999-05-20 2000-11-28 Osaka Yakin Kogyo Kk ＴｉＡｌ系焼結体の製造方法並びにそのための焼結用支持板及び焼結用金属箱
CN108658621A (zh) * 2018-05-18 2018-10-16 宜兴市东山新型材料有限公司 一种高纯氧化铝轻质承烧板及其制备方法
CN110922199A (zh) * 2019-12-31 2020-03-27 湖南仁海科技材料发展有限公司 一种黑色氧化锆陶瓷烧成用承烧板及其制备方法
CN111056859A (zh) * 2019-12-31 2020-04-24 湖南仁海科技材料发展有限公司 钛合金mim零件烧结用氧化钇多孔承烧板及其制备方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000328105A (ja) * 1999-05-20 2000-11-28 Osaka Yakin Kogyo Kk ＴｉＡｌ系焼結体の製造方法並びにそのための焼結用支持板及び焼結用金属箱
CN108658621A (zh) * 2018-05-18 2018-10-16 宜兴市东山新型材料有限公司 一种高纯氧化铝轻质承烧板及其制备方法
CN110922199A (zh) * 2019-12-31 2020-03-27 湖南仁海科技材料发展有限公司 一种黑色氧化锆陶瓷烧成用承烧板及其制备方法
CN111056859A (zh) * 2019-12-31 2020-04-24 湖南仁海科技材料发展有限公司 钛合金mim零件烧结用氧化钇多孔承烧板及其制备方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
裴立宅.《高技术陶瓷材料》.合肥工业大学出版社,2015,第47页. *

Also Published As

Publication number Publication date
CN115490534A (zh) 2022-12-20

Similar Documents

Publication Publication Date Title
CN109320219B (zh) 一种高性能铝铬质耐火材料及其制作方法与应用
CN107399988B (zh) 一种利用铝硅系工业废渣制备氧化铝-碳化硅复合多孔陶瓷的方法
CN106007758A (zh) 增韧的氮化硅结合碳化硅陶瓷复合材料及其制备方法
CN103833365B (zh) 耐高温节能型碳化硅板及其制备方法
CN106800420A (zh) 一种碳化硅晶须原位复合刚玉高温陶瓷材料及其制备方法
CN112457057A (zh) 一种电子陶瓷用复合承烧板及其制备方法
CN109467419A (zh) 一种石墨烯增强氧化铝基陶瓷型芯及其制备方法
CN103951394A (zh) 一种高温抗热震氧化铝陶瓷承烧板及其制备工艺
CN104844233A (zh) 一种燃烧炉用的特种耐火材料及其制备方法
CN105294160A (zh) 一种凝胶注模、微波烧结制备多孔氮化硅陶瓷的方法
CN108546093B (zh) 一种氧化铝短纤增强氧化镁基坩埚及其制备方法
CN107963890B (zh) 一种氮化钛多孔导电陶瓷的制备方法
CN101423412B (zh) 低温烧成制备高性能氧化硅结合碳化硅耐火材料的方法
CN110483023B (zh) 一种微孔化刚玉砖及其制备方法
CN113880562A (zh) 一种含镍铝合金的有机硅树脂结合高温烧制的铝锆碳滑板砖及其生产方法
CN110963807A (zh) 一种用于水泥窑过渡带的节能型莫来石质耐火砖及其制备方法
CN115490534B (zh) 一种mim连续烧结炉用氧化铝承烧板及其制备方法
CN108145618B (zh) 一种纳米陶瓷结合剂cbn磨具的微波制备方法
CN107382345B (zh) 一种微纳米尖晶石增韧的MgO-MA骨料的制备方法
CN112125684B (zh) 轻质、高强和高抗热震刚玉-莫来石耐火材料的制备方法
CN111875393B (zh) 烧结助剂、钛酸铝陶瓷前体料和钛酸铝陶瓷及其制造方法
KR100419778B1 (ko) 액상 반응소결에 의한 탄화규소-탄화붕소 복합체 제조방법
CN104744062B (zh) 一种陶瓷与非晶的连接方法和一种非晶合金-陶瓷复合体
CN108439959B (zh) 一种二氧化锆短纤与碱式硫酸镁晶须复合增强氧化镁基坩埚及其制备方法
CN112279657A (zh) 一种轻量矾土基耐火砖及其制备方法

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