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1. WO2020133928 - PREPARATION METHOD FOR DENSE HFC(SI)-HFB2 COMPOSITE CERAMICS

Publication Number WO/2020/133928
Publication Date 02.07.2020
International Application No. PCT/CN2019/090157
International Filing Date 05.06.2019
IPC
C04B 35/56 2006.01
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04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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35Shaped ceramic products characterised by their composition; Ceramic compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
515based on non-oxides
56based on carbides
C04B 35/58 2006.01
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35Shaped ceramic products characterised by their composition; Ceramic compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
515based on non-oxides
58based on borides, nitrides or silicides
CPC
C04B 2235/3244
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2235Aspects relating to ceramic starting mixtures or sintered ceramic products
02Composition of constituents of the starting material or of secondary phases of the final product
30Constituents and secondary phases not being of a fibrous nature
32Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
3231Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
3244Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof
C04B 2235/3804
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2235Aspects relating to ceramic starting mixtures or sintered ceramic products
02Composition of constituents of the starting material or of secondary phases of the final product
30Constituents and secondary phases not being of a fibrous nature
38Non-oxide ceramic constituents or additives
3804Borides
C04B 2235/424
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2235Aspects relating to ceramic starting mixtures or sintered ceramic products
02Composition of constituents of the starting material or of secondary phases of the final product
30Constituents and secondary phases not being of a fibrous nature
42Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
422Carbon
424Carbon black
C04B 2235/5436
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2235Aspects relating to ceramic starting mixtures or sintered ceramic products
02Composition of constituents of the starting material or of secondary phases of the final product
50Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
54Particle size related information
5418expressed by the size of the particles or aggregates thereof
5436micrometer sized, i.e. from 1 to 100 micron
C04B 2235/5454
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2235Aspects relating to ceramic starting mixtures or sintered ceramic products
02Composition of constituents of the starting material or of secondary phases of the final product
50Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
54Particle size related information
5418expressed by the size of the particles or aggregates thereof
5454nanometer sized, i.e. below 100 nm
C04B 2235/6562
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2235Aspects relating to ceramic starting mixtures or sintered ceramic products
65Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
656characterised by specific heating conditions during heat treatment
6562Heating rate
Applicants
  • 上海交通大学 SHANGHAI JIAO TONG UNIVERSITY [CN]/[CN]
Inventors
  • 郝巍 HAO, Wei
  • 赵晓峰 ZHAO, Xiaofeng
  • 倪娜 NI, Na
  • 蔡黄越 CAI, Huangyue
  • 姚尧 YAO, Yao
  • 易妹玉 YI, Meiyu
  • 郭芳威 GUO, Fangwei
Agents
  • 深圳市韦恩肯知识产权代理有限公司 WAYNE INTELLECTUAL PROPERTY AGENCY CO., LTD.
Priority Data
201811576879.923.12.2018CN
Publication Language Chinese (ZH)
Filing Language Chinese (ZH)
Designated States
Title
(EN) PREPARATION METHOD FOR DENSE HFC(SI)-HFB2 COMPOSITE CERAMICS
(FR) PROCÉDÉ DE PRÉPARATION DE CÉRAMIQUES COMPOSITES DE HFC(SI)-HFB2 DENSES
(ZH) 一种致密HfC(Si)-HfB2复相陶瓷的制备方法
Abstract
(EN)
A preparation method for dense HfC(Si)-HfB2 composite ceramics, comprising: mixing hafnium oxide powder, nano-carbon black and silicon hexaboride in the mole ratio of 1-10:1-20:1-5 to obtain mixed powder, subjecting the powder to ball milling for uniform mixing, and then drying to form uniformly mixed powder; and loading the obtained uniformly mixed powder into a graphite die for spark plasma sintering, or in other words, in-situ carbon-boron thermal reduction reaction and sintering densification are completed in a one step process, so as to obtain the HfC(Si)-HfB2 composite ceramics having a density of 94.0%-100% and uniform grain distribution. The composite ceramics prepared by sintering have uniform distribution of phase composition and grain size, and have high density and breaking tenacity.
(FR)
L'invention concerne un procédé de préparation de céramiques composites de HfC(Si)-HfB2 denses, comprenant : le mélange de poudre d'oxyde d'hafnium, de noir de carbone nanométrique et d'hexaborure de silicium en un rapport molaire de 1-10:1-20:1-5 pour obtenir de la poudre mélangée, l'opération consistant à soumettre la poudre à un broyage à billes pour son mélange uniforme, puis son séchage pour former une poudre uniformément mélangée ; et le chargement de la poudre uniformément mélangée obtenue dans une matrice en graphite pour le frittage flash (spark plasma sintering, SPS), ou en d'autres termes, la réaction de réduction thermique de carbone-bore in situ et la densification par frittage sont réalisées dans un processus en une seule étape, de manière à obtenir les céramiques composites de HfC(Si)-HfB2 ayant une densité de 94,0 % à 100 % et une distribution uniforme des grains. Les céramiques composites préparées par frittage ont une distribution uniforme de composition des phases et de taille des grains et ont de hautes densité et ténacité à la rupture.
(ZH)
一种致密HfC(Si)-HfB 2复相陶瓷的制备方法,将氧化铪粉体、纳米碳黑以及六硼化硅粉体按摩尔比为1~10∶1~20∶1~5的比例混合,获得混合粉体,经过球磨混合均匀,然后进行干燥,形成均匀的混合粉体;将得到的均匀混合粉体装入石墨模具中进行放电等离子体烧结,即原位碳-硼热还原反应-烧结致密化一步工艺完成,制备得到致密度为94.0%~100%且晶粒均匀弥散分布的HfC(Si)-HfB 2复相陶瓷。烧结制备得到的物相组成和晶粒尺寸均匀分布,同时具有较高的致密性和断裂韧性。
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