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| 1 | 偶氮二异丁腈引发液态聚碳硅烷的交联研究显示文摘在偶氮二异丁腈(2,2′–azobisisobutyronitrile,AIBN)引发下,研究液态超支化聚碳硅烷(hyperbranched polycarbosilane,HBPCS)的无氧热交联,考察交联温度、AIBN用量以及时间对交联反应及陶瓷产率的影响。结果表明:较高的温度可促进交联;AIBN用量越多越有利于交联,陶瓷产率先增加而后稳定,其最佳用量为1.0%~2.0%(质量分数,下同);随着交联时间延长,HBPCS的交联程度和陶瓷产率先增加而后保持不变。对于AIBN用量1.5%的体系,HBPCS经80℃交联6h后,其1000℃下的陶瓷产率高达75%以上。此外,对最终陶瓷相组成进行表征,发现AIBN的引入能够有效抑制β-SiC的结晶。 | 余兆菊 黄木河 李然 詹俊英 何国梅 夏海平 | 2009 | 硅酸盐学报2009，37，8： | 10 |
| 2 | ZrC-ZrB_2-SiC ceramic nanocomposites derived from a novel single-source precursor with high ceramic yield显示文摘For the first time, ZrC-ZrB_2-SiC ceramic nanocomposites were successfully prepared by a single-source-precursor route, with allylhydridopolycarbosilane(AHPCS),triethylamine borane(TEAB),and bis(cyclopentadienyl) zirconium dichloride(Cp_2 ZrCl_2) as starting materials. The polymer-to-ceramic transformation and thermal behavior of obtained single-source precursor were characterized by means of Fourier transform infrared spectroscopy(FT-IR) and thermal gravimetric analysis(TGA). The results show that the precursor possesses a high ceramic yield about 85% at 1000 ℃.The phase composition and microstructure of formed ZrC-ZrB_2-SiC ceramics were investigated by means of X-ray diffraction(XRD) and high resolution transmission electron microscopy(HRTEM).Meanwhile, the weight loss and chemical composition of the resultant ZrC-ZrB_2-SiC nanocomposites were investigated after annealing at high temperature up to 1800 ℃. High temperature behavior with respect to decomposition as well as crystallization shows a promising high temperature stability of the formed ZrC-ZrB_2-SiC nanocomposites. | Zhaoju YU Xuan LV Shuyi LAI Le YANG Wenjing LEI Xingang LUAN Ralf RIEDEL | 2019 | Journal of Advanced Ceramics2019，8，1： | 8 |
| 3 | Single-source-precursor synthesis and phase evolution of SiC-TaC-C ceramic nanocomposites containing core-shell structured TaC@C nanoparticles显示文摘A novel single-source-precursor for SiC-TaC-C nanocomposites was successfully synthesized by the chemical reaction between a polycarbosilane(allylhydridopolycarbosilane,AHPCS)and tantalum(V)chloride(TaCls),which was confirmed by Fourier transform infrared spectra(FTIR)measurement.After pyrolysis of the resultant single-source-precursors at 900'C,amorphous ceramic powders were obtained.The 900 C ceramics were anncaled at different temperatures in the range of 1200-1600℃ to gain SiC-TaC-C nanocomposites.The phase evolution of ceramic nanocomposites was investigated by X-ray diffraction(XRD)and transmission electron microscopy(TEM).The results indicate that the TaC starts to crystallize at lower temperature than theβ-SiC.It is particularly worth pointing out that the unique core-shell structured TaC-C nanoparticles were in-situ formed and homogeneously distributed in the ceramic matrix after annealing at 1400 C.Even at a high temperature of 1600 C,the grain sizes ofβ-SiC and TaC are smaller than 30 nm,flilling the definition of nanocomposites.The present study related to SiC-TaC C nanocomposites paves a new road for enriching ultra-high temperature ceramic family suitable for structural/functional applications in harsh environment. | Zhaoju YU Yujing YANG Kangwei MAO Yao FENG Qingbo WEN Ralf RIEDEL | 2020 | Journal of Advanced Ceramics2020，9，3： | 5 |
| 4 | 基于Grignard偶合法合成液态超支化聚碳硅烷显示文摘液态超支化聚碳硅烷(Liquid Hyperbranched Polycarbosilane,LHBPCS)作为一种纤维增强Si C陶瓷基复合材料的先驱体,因具有流动性好、可自交联、陶瓷产率高以及热解产物接近Si C化学计量比等优点而备受关注。在多种制备LHBPCS的方法中,Grignard偶合法因操作简单、中间产物不需要提纯、原料成本较低且可以采用多种原料混合的方法对LHBPCS的组成和结构进行调控以得到性能优越的Si C陶瓷先驱体而成为研究的热点和方向。论文对基于Grignard偶合法合成LHBPCS以及LHBPCS后续的交联和陶瓷化等工艺的主要研究进行综述,并展望今后的发展。 | 苗玉龙 裴学良 莫高明 杨建行 黄庆 何流 | 2016 | 陶瓷学报2016，37，2： | 3 |
| 5 | 超支化聚碳硅烷的掺硼改性与陶瓷化研究显示文摘通过二甲基胺硼烷(DMAB)与烯丙基超支化聚碳硅烷(AHPCS)反应合成含硼聚碳硅烷先驱体,后经170℃热交联及高温裂解制备出碳化硅陶瓷。采用傅立叶红外光谱、热重分析、X射线衍射分析及扫描电子显微镜对上述过程进行研究。结果表明,DMAB中的B—H键可分别与AHPCS中的CC键及Si—H键发生硼氢化反应和脱氢偶合反应,从而促进AHPCS的热交联,并显著提高陶瓷产率。此外,硼的引入还可有效抑制β-SiC在高温下的结晶。 | 张佩 杨乐 徐敏珊 闵浩 余兆菊 | 2014 | 功能材料2014，45，4： | 3 |
| 6 | 不同分子量固态与液态聚碳硅烷的黏度特性显示文摘采用GPC、流变仪等分析手段对不同分子量的固态PCS和液态PCS的黏度进行表征。分析了PCS分子量、软化点及黏度特性之间的关系。此外还用热重法对固态和液态PCS陶瓷产率进行表征。结果表明,LPCS在室温黏度较低,陶瓷产率较高(77%),而固态PCS熔体在>200℃具有较低黏度(500 mPa.s),因此LPCS更适于用作PIP法制备陶瓷基复合材料浸渍前驱体。 | 胡继东 陶孟 李永明 李军平 周延春 | 2012 | 宇航材料工艺2012，42，2： | 2 |
| 7 | Single-source-precursor synthesis of porous W-containing SiC-based nanocomposites as hydrogen evolution reaction electrocatalysts显示文摘In this paper,W-containing SiC-based ceramic nanocomposites were successfully prepared by a polymer-derived ceramic approach using allylhydridopolycarbosilane(AHPCS)as a SiC source,WC16 as a tungsten source,polystyrene(PS)as a pore forming agent as well as divinyl benzene(DVB)as a carbon rich source.High-temperature phase behavior of the W-containing SiC-based ceramics after heat treatment was studied,showing that excessive DVB content in the feed will inhibit the crystallinity of W-containing nanoparticles in the final ceramic nanocomposites.The high specific surface area(SSA)of 169.4-276.9 m^(2)/g can be maintained even at high temperature in the range of 1400-1500℃,due to the carbothermal reaction which usually occurs between 1300 and 1400℃.All prepared W-containing SiC-based nanocomposites reveal electrocatalytic activity for the hydrogen evolution reaction(HER).In detail,compared with reversible hydrogen electrode(RHE),the ceramic sample PWA-2-1300 after heat treatment at 1300℃ has the smallest overpotential of 286 mV when the current density is 10 mA·cm^(-2) in acid medium,indicating the promising perspective in the water splitting field. | Zhaoju YU Kangwei MAO Yao FENG | 2021 | Journal of Advanced Ceramics2021，10，6： | 1 |
| 8 | 单源聚合物先驱体法制备SiC-TiC复相陶瓷显示文摘以四氯化钛(TiCl_(4))与烯丙基聚碳硅烷(AHPCS)为原料,通过化学改性成功制备聚钛碳硅烷单源先驱体,通过高温裂解先驱体进而制得SiC-TiC复相陶瓷.通过傅里叶变换红外光谱、X射线衍射、热重分析及扫描电子显微镜研究反应合成的聚钛碳硅烷先驱体的交联、陶瓷化转变过程、微观结构演变和结晶行为.研究结果证实TiCl_(4)和AHPCS发生缩合反应,制得了Ti掺杂的聚合物先驱体,TiCl_(4)的加入还能够促进AHPCS的热交联,进而提高最终的陶瓷产率.制备的SiC-TiC复相陶瓷的相组成和微观结构可通过对先驱体的成分和结构设计进行调节,该方法操作简便易行,结果可靠性高,具有一定的普遍适用性. | 裴亚星 周聪 余兆菊 | 2022 | 厦门大学学报(自然科学版)2022，61，5： | 0 |
| 9 | PCS/VHPCS复相碳化硅先驱体的制备及性质研究显示文摘固态聚碳硅烷和全氢聚碳硅烷是目前研究较多的聚合物碳化硅陶瓷先驱体,在碳化硅陶瓷及其复合材料的制备方面具有广泛应用。制备了由不同比例固态聚碳硅烷(PCS)和乙烯基全氢聚碳硅烷(VHPCS)组成的复相碳化硅陶瓷先驱体,并对先驱体及其裂解产物的理化性质以及结构等进行了研究。研究表明,当PCS引入量低于30 wt.%时,PCS/VHPCS复相先驱体黏度低于200mPa·s;当PCS引入量低于20wt.%时,陶瓷产率可达到80%以上。PCS/VHPCS复相先驱体陶瓷产物为半结晶状β-SiC,晶粒尺寸较小,无明显晶界出现,且元素分布均匀,碳硅比低于PCS衍生陶瓷。 | 陈义 邱海鹏 陈明伟 谢巍杰 王岭 张琪悦 | 2024 | 陶瓷学报2024，45，1： | 0 |
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