CN110183230A - 一种多层结构的耐高温雷达吸波材料 - Google Patents

一种多层结构的耐高温雷达吸波材料 Download PDF

Info

Publication number
CN110183230A
CN110183230A CN201910428518.8A CN201910428518A CN110183230A CN 110183230 A CN110183230 A CN 110183230A CN 201910428518 A CN201910428518 A CN 201910428518A CN 110183230 A CN110183230 A CN 110183230A
Authority
CN
China
Prior art keywords
high temperature
temperature resistant
dielectric
multilayered structure
powder
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.)
Pending
Application number
CN201910428518.8A
Other languages
English (en)
Inventor
陈照峰
王恩慧
罗发
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.)
Suqian Southern Airlines New Materials And Equipment Manufacturing Research Institute Co Ltd
Original Assignee
Suqian Southern Airlines New Materials And Equipment Manufacturing Research Institute 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 Suqian Southern Airlines New Materials And Equipment Manufacturing Research Institute Co Ltd filed Critical Suqian Southern Airlines New Materials And Equipment Manufacturing Research Institute Co Ltd
Priority to CN201910428518.8A priority Critical patent/CN110183230A/zh
Publication of CN110183230A publication Critical patent/CN110183230A/zh
Pending legal-status Critical Current

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
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/24Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing alkyl, ammonium or metal silicates; containing silica sols
    • 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
    • C04B35/515Shaped 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
    • C04B35/56Shaped 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 carbides or oxycarbides
    • C04B35/5607Shaped 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 carbides or oxycarbides based on refractory metal carbides
    • C04B35/5611Shaped 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 carbides or oxycarbides based on refractory metal carbides based on titanium carbides
    • C04B35/5615Shaped 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 carbides or oxycarbides based on refractory metal carbides based on titanium carbides based on titanium silicon carbides
    • 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
    • C04B35/62222Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products obtaining ceramic coatings
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D1/00Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40Additives
    • C09D7/60Additives non-macromolecular
    • C09D7/61Additives non-macromolecular inorganic
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q17/00Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
    • 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
    • C04B2235/40Metallic constituents or additives not added as binding phase
    • C04B2235/402Aluminium

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Structural Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Inorganic Insulating Materials (AREA)

Abstract

本发明提供了一种多层结构的耐高温雷达吸波材料,其特征在于,所述多层结构的耐高温雷达吸波材料由内至外依次包括内介质层、耐高温介电涂层和外介质层,其中,所述耐高温介电涂层为Al掺杂Ti3SiC2陶瓷介电涂层;所述介质层为超细玻璃纤维增强氧化物基复合材料,以超细玻璃纤维、石英布、硅溶胶为原料,采用溶胶‑凝胶法制得,玻璃纤维直径为1μm~5μm;该多层结构通过介质层设置的预制孔采用缝合的方式复合。本发明获得的有益效果是:耐高温雷达吸波材料可以耐受至少1000℃以上的高温,具有较好的耐高温性和优异的抗氧化性;能实现较宽的微波吸收频段;材料整体具有较好的抗断裂性能。

Description

一种多层结构的耐高温雷达吸波材料
技术领域
本发明涉及一种雷达吸波材料,尤其涉及一种多层结构的耐高温雷达吸波材料。
背景技术
雷达吸波材料根据服役温度范围可以划分为常温(使用温度低于200℃)和高温两大类。相比而言,目前常温雷达吸波材料的研究比较成熟,而对高温雷达吸波材料的研究还处于积极探索中。
目前已经公开报道了几种高温吸波陶瓷结构及其制备方法。专利号为ZL201110052115.1的中国专利公开了一种三层结构的碳化硅复合材料吸波陶瓷及其制备方法,该报道的吸波陶瓷由匹配层、损耗层和反射层组成,根据设计要求各功能层需具备不同的介电性能,制备的吸波陶瓷在8GHz~18GHz频段内的反射率可小于-9dB。专利号为ZL201110053460.7的中国专利公开了一种四层结构的碳化硅复合材料吸波陶瓷及其制备方法,该报道的吸波陶瓷由匹配层、损耗层、介质层和反射层组成,根据设计要求各功能层需具备不同的介电性能,制备的吸波陶瓷室温8GHz~18GHz频段内的反射率可小于-8dB,700℃高温考核下,其反射率低于-8dB的带宽仍有将近10GHz左右。但是以上公开的高温吸波陶瓷根据各功能层不同的电性能要求需制备出不同电阻率的碳化硅纤维,实现有一定难度,且成本较高;并且以上报道的吸波陶瓷结构复杂,工艺要求较高。
发明内容
针对背景技术的不足之处,本发明是这样实现的:
一种多层结构的耐高温雷达吸波材料,其特征在于,所述多层结构的耐高温雷达吸波材料由内至外依次包括内介质层、耐高温介电涂层和外介质层,其中,所述耐高温介电涂层为Al掺杂Ti3SiC2陶瓷介电涂层;所述介质层为超细玻璃纤维增强氧化物基复合材料,以超细玻璃纤维、石英布、硅溶胶为原料,采用溶胶-凝胶法制得,玻璃纤维直径为1μm~5μm;该多层结构通过介质层设置的预制孔采用高硅氧玻璃纤维缝合的方式复合。
进一步的,所述内介质层和外介质层的厚度为3~8mm;所述的耐高温介电涂层厚度为0.01~0.04mm。
进一步的,所述的耐高温介电涂层制备方法如下:
(1)称量纯度均为99%的Ti粉、Si粉和TiC粉,以及掺杂剂Al粉,摩尔比为2∶1.5~2.5∶2~5∶0.1~0.5,混合均匀;
(2)将称量好的粉体置于行星式球磨机中球磨,加入无水乙醇,球磨时间为5~10h,速率为200~600r/min;
(3)将球磨过的粉体放在去离子水中超声清洗,清洗时间为20~40min,烘干;
(4)将烘干的的混合粉置于石墨模具中,放进热压烧结炉内,温度为1150~1450℃,时间为1~10h,压力为5~30MPa;
(5)取出样品,去掉石墨模具,将得到的陶瓷块状材料球磨成粉,再与有机载体混合均匀制成耐高温介电涂料,均匀涂覆于介质层上经干燥制得耐高温介电涂层,干燥温度为100~300℃,干燥时间为3~5h。
进一步的,所述的有机载体的质量分数为20%~25%;所述有机载体主要由质量分数为65%~80%的柠檬酸三丁酯、1%~10%的硝酸纤维素、15%~20%卵磷脂组成。
本发明通过以上技术方案所获得的有益效果是:
1、本发明的耐高温雷达吸波材料可以耐受至少1200℃以上的高温,具有较好的耐高温性和优异的抗氧化性。
2、本发明的耐高温雷达吸波材料采用复合材料二次缝合技术制备而成,使得复合材料有着较高的层间剪切强度,因而具有较好的力学性能和抗热震性能,从而可以实现吸波、承载和防热等多重功能的一体化。
3、Al掺杂大幅度提高了Ti3SiC2陶瓷微波介电性,使其在8.2~12.4GHz频率范围内大大改善材料的微波损耗性能
具体实施方式
下面结合具体实施例,进一步阐明本发明,应理解这些实施例仅用于说明本发明而不用于限制本发明的范围,在阅读了本发明之后,本领域技术人员对本发明的各种等价形式的修改均落于本申请所附权利要求所限定。
实施例1
一种多层结构的耐高温雷达吸波材料,由内至外依次包括内介质层、耐高温介电涂层和外介质层,其中,耐高温介电涂层为Al掺杂Ti3SiC2陶瓷介电涂层;介质层均为超细玻璃纤维增强氧化物基复合材料,以超细玻璃纤维、石英布、硅溶胶为原料,采用溶胶-凝胶法制得,玻璃纤维直径为3μm;该多层结构通过介质层设置的预制孔采用高硅氧玻璃纤维缝合的方式复合。
内介质层和外介质层的厚度为4mm;所述的耐高温介电涂层厚度为0.02mm。
耐高温介电涂层制备方法如下:
(1)称量纯度均为99%的Ti粉、Si粉和TiC粉,以及掺杂剂Al粉,摩尔比为2∶1.5∶2∶0.1,混合均匀;
(2)将称量好的粉体置于行星式球磨机中球磨,加入无水乙醇,球磨时间为6h,速率为250r/min;
(3)将球磨过的粉体放在去离子水中超声清洗,清洗时间为25min,烘干;
(4)将烘干的的混合粉置于石墨模具中,放进热压烧结炉内,温度为1250℃,时间为4h,压力为20MPa;
(5)取出样品,去掉石墨模具,将得到的陶瓷块状材料球磨成粉,再与有机载体混合均匀制成耐高温介电涂料,均匀涂覆于介质层上经干燥制得耐高温介电涂层,干燥温度为180℃,干燥时间为5h。
有机载体的质量分数为20%;所述有机载体主要由质量分数为75%的柠檬酸三丁酯、8%的硝酸纤维素、17%卵磷脂组成。
实施例2
一种多层结构的耐高温雷达吸波材料,由内至外依次包括内介质层、耐高温介电涂层和外介质层,其中,耐高温介电涂层为Al掺杂Ti3SiC2陶瓷介电涂层;介质层均为超细玻璃纤维增强氧化物基复合材料,以超细玻璃纤维、石英布、硅溶胶为原料,采用溶胶-凝胶法制得,玻璃纤维直径为3.5μm;该多层结构通过介质层设置的预制孔采用缝合的方式复合。
内介质层和外介质层的厚度为6mm;所述的耐高温介电涂层厚度为0.03mm。
耐高温介电涂层制备方法如下:
(1)称量纯度均为99%的Ti粉、Si粉和TiC粉,以及掺杂剂Al粉,摩尔比为2∶2.5∶3∶0.3,混合均匀;
(2)将称量好的粉体置于行星式球磨机中球磨,加入无水乙醇,球磨时间为7h,速率为400r/min;
(3)将球磨过的粉体放在去离子水中超声清洗,清洗时间为35min,烘干;
(4)将烘干的的混合粉置于石墨模具中,放进热压烧结炉内,温度为1350℃,时间为6h,压力为25MPa;
(5)取出样品,去掉石墨模具,将得到的陶瓷块状材料球磨成粉,再与有机载体混合均匀制成耐高温介电涂料,均匀涂覆于介质层上经干燥制得耐高温介电涂层,干燥温度为250℃,干燥时间为4h。
有机载体的质量分数为25%;所述有机载体主要由质量分数为80%的柠檬酸三丁酯、5%的硝酸纤维素、15%卵磷脂组成。
上述仅为本发明的两个具体实施方式,但本发明的设计构思并不局限于此,凡利用此构思对本发明进行非实质性的改动,均应属于侵犯本发明保护的范围的行为。但凡是未脱离本发明技术方案的内容,依据本发明的技术实质对以上实施例所作的任何形式的简单修改、等同变化与改型,仍属于本发明技术方案的保护范围。

Claims (4)

1.一种多层结构的耐高温雷达吸波材料,其特征在于,所述多层结构的耐高温雷达吸波材料由内至外依次包括内介质层、耐高温介电涂层和外介质层,其中,所述耐高温介电涂层为Al掺杂Ti3SiC2陶瓷介电涂层;所述介质层为超细玻璃纤维增强氧化物基复合材料,以超细玻璃纤维、石英布、硅溶胶为原料,采用溶胶-凝胶法制得,玻璃纤维直径为1μm~5μm;该多层结构通过介质层设置的预制孔采用高硅氧玻璃纤维缝合的方式复合。
2.根据权利要求1所述的多层结构的耐高温雷达吸波材料,其特征在于,所述内介质层和外介质层的厚度为3~8mm;所述的耐高温介电涂层厚度为0.01~0.04mm。
3.根据权利要求1所述的一种多层结构的耐高温雷达吸波材料,其特征在于所述的耐高温介电涂层制备方法如下:
(1)称量纯度均为99%的Ti粉、Si粉和TiC粉,以及掺杂剂Al粉,摩尔比为2∶1.5~2.5∶2~5∶0.1~0.5,混合均匀;
(2)将称量好的粉体置于行星式球磨机中球磨,加入无水乙醇,球磨时间为5~10h,速率为200~600r/min;
(3)将球磨过的粉体放在去离子水中超声清洗,清洗时间为20~40min,烘干;
(4)将烘干的的混合粉置于石墨模具中,放进热压烧结炉内,温度为1150~1450℃,时间为1~10h,压力为5~30MPa;
(5)取出样品,去掉石墨模具,将得到的陶瓷块状材料球磨成粉,再与有机载体混合均匀制成耐高温介电涂料,均匀涂覆于介质层上经干燥制得耐高温介电涂层,干燥温度为100~300℃,干燥时间为3~5h。
4.根据权利要求4所述的所述耐高温介电涂层,其特征在于所述的有机载体的质量分数为20%~25%;所述有机载体主要由质量分数为65%~80%的柠檬酸三丁酯、1%~10%的硝酸纤维素、15%~20%卵磷脂组成。
CN201910428518.8A 2019-05-16 2019-05-16 一种多层结构的耐高温雷达吸波材料 Pending CN110183230A (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910428518.8A CN110183230A (zh) 2019-05-16 2019-05-16 一种多层结构的耐高温雷达吸波材料

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910428518.8A CN110183230A (zh) 2019-05-16 2019-05-16 一种多层结构的耐高温雷达吸波材料

Publications (1)

Publication Number Publication Date
CN110183230A true CN110183230A (zh) 2019-08-30

Family

ID=67717367

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910428518.8A Pending CN110183230A (zh) 2019-05-16 2019-05-16 一种多层结构的耐高温雷达吸波材料

Country Status (1)

Country Link
CN (1) CN110183230A (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111170753A (zh) * 2020-01-21 2020-05-19 烟台大学 一种具有耐高温性能的含电路屏陶瓷吸波材料及其制备方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2092606A4 (en) * 2006-10-19 2009-12-23 Totalfoersvarets Forskningsins MICROWAVE ABSORPTION, ESPECIALLY FOR HIGH-TEMPERATURE APPLICATIONS
CN104387067A (zh) * 2014-10-23 2015-03-04 西安电子科技大学 高介电损耗钛硅碳粉体微波吸收剂的制备方法
CN106042515A (zh) * 2016-05-18 2016-10-26 中国人民解放军国防科学技术大学 一种夹层结构的耐高温雷达吸波材料及其制备方法
CN106427115A (zh) * 2016-09-21 2017-02-22 中国人民解放军国防科学技术大学 一种基于双层超材料的耐高温雷达红外兼容隐身材料及其制备方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2092606A4 (en) * 2006-10-19 2009-12-23 Totalfoersvarets Forskningsins MICROWAVE ABSORPTION, ESPECIALLY FOR HIGH-TEMPERATURE APPLICATIONS
CN104387067A (zh) * 2014-10-23 2015-03-04 西安电子科技大学 高介电损耗钛硅碳粉体微波吸收剂的制备方法
CN106042515A (zh) * 2016-05-18 2016-10-26 中国人民解放军国防科学技术大学 一种夹层结构的耐高温雷达吸波材料及其制备方法
CN106427115A (zh) * 2016-09-21 2017-02-22 中国人民解放军国防科学技术大学 一种基于双层超材料的耐高温雷达红外兼容隐身材料及其制备方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111170753A (zh) * 2020-01-21 2020-05-19 烟台大学 一种具有耐高温性能的含电路屏陶瓷吸波材料及其制备方法
CN111170753B (zh) * 2020-01-21 2022-05-17 烟台大学 一种具有耐高温性能的含电路屏陶瓷吸波材料及其制备方法

Similar Documents

Publication Publication Date Title
CN106042515B (zh) 一种夹层结构的耐高温雷达吸波材料及其制备方法
CN106220211B (zh) 一种基于超材料的碳化硅复合材料吸波陶瓷及其制备方法
CN101693626B (zh) 一种骨质瓷及其制备方法
CN101104567B (zh) 氧化铝陶瓷表面金属复合层及复合工艺
CN107039778B (zh) 一种基于双层超材料的耐高温雷达吸波材料及其制备方法
CN106904960B (zh) 一种Mg2SiO4-Li2TiO3复合体系LTCC材料及其制备方法
CN105174972B (zh) 一种玻璃/陶瓷纳米复合材料的制备方法
CN103664213B (zh) 一种混编纤维增韧的高温透波复合材料的制备方法
CN104876616A (zh) 一种耐高温吸波材料及其制备方法
CN107434411A (zh) 低介高品质因数ltcc微波介质材料及其制备方法
CN108929049A (zh) 一种通过表面修饰提升玄武岩纤维耐高温性能的方法
CN108191234A (zh) 锡氧化物掺杂赤泥耐碱玻璃纤维及其制备方法
CN106810208B (zh) 一种利用玻璃纤维废丝制作的玻化瓷砖及其制备方法
CN109336559A (zh) 一种可耐高温的陶瓷及其制备方法
CN103351155B (zh) 低温烧结二氧化硅基复合陶瓷及其制备方法
CN107759251A (zh) 一种多孔陶瓷表面高韧性陶瓷涂层的制备方法
CN110183230A (zh) 一种多层结构的耐高温雷达吸波材料
CN102049514B (zh) 氧化铝陶瓷纳米金属化膏剂用粉料及其制备方法
CN115677365A (zh) 一种高强度日用陶瓷及其制备方法
CN101767987A (zh) 一种用于热障涂层陶瓷层的钇铒铝酸盐粉体及其制备方法
CN104817334A (zh) 一种热喷涂用抗开裂陶瓷及其制备方法
CN113817946B (zh) 一种HEA-SiC高温吸波材料及其制备方法
CN108264358B (zh) 具有电磁波宽频强吸收的柔性SiC/Si3N4复合纳米纤维的制备方法
CN104649692A (zh) 一种高铬陶瓷纤维及其制备方法
CN102167512A (zh) 钛合金用碳化硅掺杂玻璃-陶瓷涂料

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
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20190830

WD01 Invention patent application deemed withdrawn after publication