Article(id=1320098226099835376, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1320098188355285873, articleNumber=null, orderNo=null, doi=10.14062/j.issn.0454-5648.20240272, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1712678400000, receivedDateStr=2024-04-10, revisedDate=1714060800000, revisedDateStr=2024-04-26, acceptedDate=null, acceptedDateStr=null, onlineDate=1792665543341, onlineDateStr=2026-10-22, pubDate=1726761600000, pubDateStr=2024-09-20, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1792665543341, onlineIssueDateStr=2026-10-22, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1792665543341, creator=13701087609, updateTime=1792665543341, updator=13701087609, issue=Issue{id=1320098188355285873, tenantId=1146029695717560320, journalId=1263187385517883426, year='2024', volume='52', issue='9', pageStart='2755', pageEnd='3090', issueExtLink='null', onlineDate='null', pubDate='1726761600000', pubDateStr='2024-09-20', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1792665534341, creator='13701087609', updateTime=1792666312798, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1320101453507711442, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1320098188355285873, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1320101453507711443, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1320098188355285873, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=2789, endPage=2799, ext={EN=ArticleExt(id=1320098226389242353, articleId=1320098226099835376, tenantId=1146029695717560320, journalId=1263187385517883426, language=EN, title=Fabrication and Performance of SiC Ceramic Fibers Containing Yttrium and Aluminum, columnId=1321894601024197240, journalTitle=Journal of the Chinese Ceramic Society, columnName=Special Issue on Polymer-Derived Ceramics—Research Article, runingTitle=null, highlight=null, articleAbstract=
Introduction

The SiCxOy phase in SiC fibers will decompose at high temperature, which results in the loose structure, declining mechanical performance, and lowing the high temperature resistance of the fibers. Introduction of some elements can play the role of sintering assistant at high temperature. Nearly stoichiometric polycrystalline SiC fibers can improve the oxidation resistance of fibers at high temperature. Al and Y are commonly used as sintering additives for SiC ceramics. Al and Y can form yttrium aluminum garnet (YAG) liquid phase at high temperature. The YAG liquid phase is conducive to reduce the sintering temperature and improve the densification of SiC ceramics. If the SiC fibers can form YAG phase at high temperature, the performance of SiC fibers can be improved. In this work, the both Y and Al are introduced for the fabrication of high performance SiC fibers.

Methods

A certain amount of polydimethylsilane (PDMS) was placed in a flask, raised to 470 ℃ and hold for 42 h in N2, then cooled to room temperature, filtered to obtain yellowish viscous polysilacarbosilane (PSCS). 0.4 g yttrium acetylacetone (Y(AcAc)3) and 0.6 g aluminum acetylacetone (Al(AcAc)3) were uniformly mixed with 20 g PSCS in a flask, polymerized in N2, and then dissolved, filtered, and distilled under vacuum to obtain polyyttrio-aluminocarbosilane (PYACS) precursor.

A certain amount of PYACS precursor was added to a spinning cylinder, heated to 300 ℃ in N2, for defoaming, then reduced to 240 ℃. Using a pressurized N2 (flow rate of 0.1 L/min), the melt was extruded through a single hole spinneret and the fiber was stretched and wound on a spool by a drafting device at a winding speed of 350 r/min. Curing of the fibers was carried out by exposing fibers in iodine with mass ratio of 3∶5, covered with glass and placed in oven. The system was heated up to 80 ℃ for 3 h, then cooling to room temperature.

PYACS fibers were pyrolysied in N2 and converted into ceramic fibers at different temperature schdule, such as 20 ℃ to 400 ℃ with a heating rate of 150 ℃/h, 400 ℃ to 800 ℃ with a heating rate of 100 ℃/h, 800 ℃ to 1 000 ℃ with heating rate of 150 ℃/h. Si-C-O-(Y/Al) fibers are fired at 1 000 ℃ for 1 h. The Si-C-O-(Y/Al) fibers were heated to 1 400, 1 600 and 1 900 ℃ in argon according to certain procedures.

Results and discussion

Due to the higher molecular weight of polycarbosilane (LPCS), it tends to crosslink during polymerization, which is notably affecting the spinning properties and fiber characteristics. To solve this problem, PYACS fibers were synthesized by addition of Y(AcAc)3 and Al(AcAc)3 into liquid PSCS, providing uniform molecular weight with excellent spinnability. The Y and Al elements are effectively introduced into the PYACS precursor as the form of Si—O—Y and Si—O—Al. PYACS fibers were obtained successfully by melt-spinning and iodine vapor curing. The cross-linking of fibers can be achieved with the iodine vapor curing, where iodine plays the critical role of accelerating the cleavage of Si—H, Si—Si, and C—H bonds, and recombination to form cross-linked networks of Si—O—Si. The amorphous Si—C—O—(Y/Al) fibers were obtained by pyrolysising at 1 000 ℃, and the ceramic yield was 73.96%. The effects of different heat treatment temperatures (1 400, 1 600, 1 900 ℃) on the morphology and structure of the Si—C—O—(Y/Al) fibers were investigated. After heat treatment at 1 400 ℃, the fibers remained amorphous, with smooth surface and dense cross section. After heat treatment at 1 600 ℃, the fibers has obvious β-SiC diffraction peak. And the fibers surface and the cross sections are loose porous structure, the diameter becomes smaller. The degradation reaction occurs in the fibers may be the main reason for the formation of porous degraded fibers, SiC grains are formed in Si—C—O—(Y/Al) fibers, and the release of CO gas. After heat treatment at 1 900 ℃, the crystalline degree of SiC fibers doped with Al and Y is higher, the grain size increases, and the fibers diameter decreases further. Al and Y in Si—C—O—(Y/Al) fibers exist as Al—O—Y at 1 900 ℃. The doping of Al and Y plays a role of sintering additives at high temperature.

Conclusions

The main conclusions of this paper are summarized as following. The Y and Al elements are effectively introduced into the PYACS precursor as the form of Si—O—Y and Si—O—Al. The crosslinking of fibers can be achieved with the iodine vapor curing. The amorphous Si—C—O—(Y/Al) fibers were obtained by pyrolysising at 1 000 ℃, and the ceramic yield was 73.96%. The effects of different heat treatment temperatures (1 400, 1 600, 1 900 ℃) on the morphology and structure of the fibers were investigated. After heat treatment at 1 400 ℃, the fibers remained amorphous, with smooth surface and dense cross section. After heat treatment at 1 600 ℃, the fibers has obvious β-SiC diffraction peak. The surface and cross section of the fibers are loose and porous structures. After heat treatment at 1 900 ℃, the crystalline degree of SiC fibers is higher, the grain size of SiC is increased, the diameter of the fibers is further reduced, and the structure is gradually densified. Al and Y in Si—C—O—(Y/Al) fibers exist as Al—O—Y at 1 900 ℃. This study demonstrates that the presence of Al and Y can reduce the formation of SiC crystal particles and nano-pores on the fiber surface at high temperature. The doping of Al and Y plays a role in the sintering densification of SiC fibers. This work has practical significance for the fabrication of SiC fibers containing heterogeneous element.

, authors=Xiao ZHANG, Jianjun CHEN, Xiaohong LI, Mengna ZHANG, Junchong LU, authorsList=Xiao ZHANG, Jianjun CHEN, Xiaohong LI, Mengna ZHANG, Junchong LU, authorCompany=null, correspAuthors=Jianjun CHEN, authorNote=

ZHANG Xiao (1999-), female, Master candidate. E-mail:

, correspAuthorsNote=
CHEN Jianjun (1974-), male, Ph.D., Professor. E-mail:
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SiC纤维中无定形的SiCxOy相在高温下发生分解,会导致SiC微晶的生长和性能下降,在SiC纤维中掺入异质元素可以在高温下起到烧结助剂的作用,从而提高SiC纤维的性能。采用实验室自制的聚硅碳硅烷(PSCS)与乙酰丙酮钇、乙酰丙酮铝反应制备得到含钇铝聚碳硅烷(PYACS),经过熔融纺丝、碘不熔化、高温烧成等工艺,制得含钇铝SiC陶瓷纤维。结果表明,PYACS先驱体中有效的引入了Y和Al元素,并以Si—O—Y、Si—O—Al的形式存在。采用碘不熔化实现了纤维的交联,并通过1000 ℃高温裂解获得非晶Si—C—O—(Y/Al)纤维,陶瓷产率为73.96%。研究了不同热处理温度(1400,1600,1900 ℃)对纤维形貌和结构的影响,1900 ℃高温热处理的Si—C—O—(Y/Al)纤维中Al和Y以Al—O—Y的形式存在,SiC结晶程度更高,SiC晶粒尺寸增大,纤维直径进一步变小,结构逐渐致密,说明高温下Al和Y的掺杂起到了烧结致密化作用。

, authors=张潇, 陈建军, 李晓鸿, 张梦娜, 陆俊冲, authorsList=张潇, 陈建军, 李晓鸿, 张梦娜, 陆俊冲, authorCompany=null, correspAuthors=陈建军, authorNote=

张潇(1999—),女,硕士研究生。

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陈建军(1974—),男,博士,教授。
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含钇铝碳化硅陶瓷纤维的制备及性能
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张潇 , 陈建军 , 李晓鸿 , 张梦娜 , 陆俊冲
硅酸盐学报 | 聚合物先驱体陶瓷专题—研究论文 2024,52(9): 2789-2799
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硅酸盐学报 |聚合物先驱体陶瓷专题—研究论文 2024 , 52 (9) : 2789 -2799
含钇铝碳化硅陶瓷纤维的制备及性能
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张潇 , 陈建军 , 李晓鸿, 张梦娜, 陆俊冲
作者信息
  • 浙江理工大学材料科学与工程学院,杭州 310018
通讯作者:
陈建军(1974—),男,博士,教授。
作者简介:

张潇(1999—),女,硕士研究生。

Fabrication and Performance of SiC Ceramic Fibers Containing Yttrium and Aluminum
Xiao ZHANG , Jianjun CHEN , Xiaohong LI, Mengna ZHANG, Junchong LU
Affiliations
  • School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China
  • Corresponding Author:
    CHEN Jianjun (1974-), male, Ph.D., Professor. E-mail:

    ZHANG Xiao (1999-), female, Master candidate. E-mail:

出版时间: 2024-09-20 doi: 10.14062/j.issn.0454-5648.20240272
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SiC纤维中无定形的SiCxOy相在高温下发生分解,会导致SiC微晶的生长和性能下降,在SiC纤维中掺入异质元素可以在高温下起到烧结助剂的作用,从而提高SiC纤维的性能。采用实验室自制的聚硅碳硅烷(PSCS)与乙酰丙酮钇、乙酰丙酮铝反应制备得到含钇铝聚碳硅烷(PYACS),经过熔融纺丝、碘不熔化、高温烧成等工艺,制得含钇铝SiC陶瓷纤维。结果表明,PYACS先驱体中有效的引入了Y和Al元素,并以Si—O—Y、Si—O—Al的形式存在。采用碘不熔化实现了纤维的交联,并通过1000 ℃高温裂解获得非晶Si—C—O—(Y/Al)纤维,陶瓷产率为73.96%。研究了不同热处理温度(1400,1600,1900 ℃)对纤维形貌和结构的影响,1900 ℃高温热处理的Si—C—O—(Y/Al)纤维中Al和Y以Al—O—Y的形式存在,SiC结晶程度更高,SiC晶粒尺寸增大,纤维直径进一步变小,结构逐渐致密,说明高温下Al和Y的掺杂起到了烧结致密化作用。

碳化硅纤维  /  含钇铝聚碳硅烷  /  碘不熔化  /  高温烧结
Introduction

The SiCxOy phase in SiC fibers will decompose at high temperature, which results in the loose structure, declining mechanical performance, and lowing the high temperature resistance of the fibers. Introduction of some elements can play the role of sintering assistant at high temperature. Nearly stoichiometric polycrystalline SiC fibers can improve the oxidation resistance of fibers at high temperature. Al and Y are commonly used as sintering additives for SiC ceramics. Al and Y can form yttrium aluminum garnet (YAG) liquid phase at high temperature. The YAG liquid phase is conducive to reduce the sintering temperature and improve the densification of SiC ceramics. If the SiC fibers can form YAG phase at high temperature, the performance of SiC fibers can be improved. In this work, the both Y and Al are introduced for the fabrication of high performance SiC fibers.

Methods

A certain amount of polydimethylsilane (PDMS) was placed in a flask, raised to 470 ℃ and hold for 42 h in N2, then cooled to room temperature, filtered to obtain yellowish viscous polysilacarbosilane (PSCS). 0.4 g yttrium acetylacetone (Y(AcAc)3) and 0.6 g aluminum acetylacetone (Al(AcAc)3) were uniformly mixed with 20 g PSCS in a flask, polymerized in N2, and then dissolved, filtered, and distilled under vacuum to obtain polyyttrio-aluminocarbosilane (PYACS) precursor.

A certain amount of PYACS precursor was added to a spinning cylinder, heated to 300 ℃ in N2, for defoaming, then reduced to 240 ℃. Using a pressurized N2 (flow rate of 0.1 L/min), the melt was extruded through a single hole spinneret and the fiber was stretched and wound on a spool by a drafting device at a winding speed of 350 r/min. Curing of the fibers was carried out by exposing fibers in iodine with mass ratio of 3∶5, covered with glass and placed in oven. The system was heated up to 80 ℃ for 3 h, then cooling to room temperature.

PYACS fibers were pyrolysied in N2 and converted into ceramic fibers at different temperature schdule, such as 20 ℃ to 400 ℃ with a heating rate of 150 ℃/h, 400 ℃ to 800 ℃ with a heating rate of 100 ℃/h, 800 ℃ to 1 000 ℃ with heating rate of 150 ℃/h. Si-C-O-(Y/Al) fibers are fired at 1 000 ℃ for 1 h. The Si-C-O-(Y/Al) fibers were heated to 1 400, 1 600 and 1 900 ℃ in argon according to certain procedures.

Results and discussion

Due to the higher molecular weight of polycarbosilane (LPCS), it tends to crosslink during polymerization, which is notably affecting the spinning properties and fiber characteristics. To solve this problem, PYACS fibers were synthesized by addition of Y(AcAc)3 and Al(AcAc)3 into liquid PSCS, providing uniform molecular weight with excellent spinnability. The Y and Al elements are effectively introduced into the PYACS precursor as the form of Si—O—Y and Si—O—Al. PYACS fibers were obtained successfully by melt-spinning and iodine vapor curing. The cross-linking of fibers can be achieved with the iodine vapor curing, where iodine plays the critical role of accelerating the cleavage of Si—H, Si—Si, and C—H bonds, and recombination to form cross-linked networks of Si—O—Si. The amorphous Si—C—O—(Y/Al) fibers were obtained by pyrolysising at 1 000 ℃, and the ceramic yield was 73.96%. The effects of different heat treatment temperatures (1 400, 1 600, 1 900 ℃) on the morphology and structure of the Si—C—O—(Y/Al) fibers were investigated. After heat treatment at 1 400 ℃, the fibers remained amorphous, with smooth surface and dense cross section. After heat treatment at 1 600 ℃, the fibers has obvious β-SiC diffraction peak. And the fibers surface and the cross sections are loose porous structure, the diameter becomes smaller. The degradation reaction occurs in the fibers may be the main reason for the formation of porous degraded fibers, SiC grains are formed in Si—C—O—(Y/Al) fibers, and the release of CO gas. After heat treatment at 1 900 ℃, the crystalline degree of SiC fibers doped with Al and Y is higher, the grain size increases, and the fibers diameter decreases further. Al and Y in Si—C—O—(Y/Al) fibers exist as Al—O—Y at 1 900 ℃. The doping of Al and Y plays a role of sintering additives at high temperature.

Conclusions

The main conclusions of this paper are summarized as following. The Y and Al elements are effectively introduced into the PYACS precursor as the form of Si—O—Y and Si—O—Al. The crosslinking of fibers can be achieved with the iodine vapor curing. The amorphous Si—C—O—(Y/Al) fibers were obtained by pyrolysising at 1 000 ℃, and the ceramic yield was 73.96%. The effects of different heat treatment temperatures (1 400, 1 600, 1 900 ℃) on the morphology and structure of the fibers were investigated. After heat treatment at 1 400 ℃, the fibers remained amorphous, with smooth surface and dense cross section. After heat treatment at 1 600 ℃, the fibers has obvious β-SiC diffraction peak. The surface and cross section of the fibers are loose and porous structures. After heat treatment at 1 900 ℃, the crystalline degree of SiC fibers is higher, the grain size of SiC is increased, the diameter of the fibers is further reduced, and the structure is gradually densified. Al and Y in Si—C—O—(Y/Al) fibers exist as Al—O—Y at 1 900 ℃. This study demonstrates that the presence of Al and Y can reduce the formation of SiC crystal particles and nano-pores on the fiber surface at high temperature. The doping of Al and Y plays a role in the sintering densification of SiC fibers. This work has practical significance for the fabrication of SiC fibers containing heterogeneous element.

silicon carbide ceramic fiber  /  polyyttrio-aluminocarbosilane  /  iodine vapor curing  /  sintering
张潇, 陈建军, 李晓鸿, 张梦娜, 陆俊冲. 含钇铝碳化硅陶瓷纤维的制备及性能. 硅酸盐学报, 2024 , 52 (9) : 2789 -2799 . DOI: 10.14062/j.issn.0454-5648.20240272
Xiao ZHANG, Jianjun CHEN, Xiaohong LI, Mengna ZHANG, Junchong LU. Fabrication and Performance of SiC Ceramic Fibers Containing Yttrium and Aluminum[J]. Journal of the Chinese Ceramic Society, 2024 , 52 (9) : 2789 -2799 . DOI: 10.14062/j.issn.0454-5648.20240272
  • 国家自然科学基金(51872262)
  • 浙江省自然科学基金(LZ23E 020003)
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doi: 10.14062/j.issn.0454-5648.20240272
  • 接收时间:2024-04-10
  • 首发时间:2026-10-22
  • 出版时间:2024-09-20
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  • 收稿日期:2024-04-10
  • 修回日期:2024-04-26
基金
国家自然科学基金(51872262)
浙江省自然科学基金(LZ23E 020003)
作者信息
    浙江理工大学材料科学与工程学院,杭州 310018

通讯作者:

陈建军(1974—),男,博士,教授。
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
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