Nanostructure and Calorimetry of Amorphous SiCN and SiBCN Ceramics

非晶 SiCN 和 SiBCN 陶瓷的纳米结构和量热学

• 批准号: 131173649
• 负责人: Professor Dr. Hans-Joachim Kleebe
• 金额: --
• 依托单位: Institut für Angewandte Geowissenschaften (IAG)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/131173649?language=en
• 关键词: Nanostructure; Calorimetry; Amorphous; SiCN; SiBCN

Intellectual Merit: Polymer derived ceramics (PDCs) are a broad group of x-ray amorphous but nanoscopically heterogeneous materials obtained by careful thermal decomposition of organic polymers which provide silicon, carbon, oxygen, nitrogen, and/or boron in controlled proportions. They are lightweight, have excellent mechanical properties, and persist without crystallization or degradation to near 1500 oC. This project brings together groups in the U.S.A. and Germany with expertise in PDC synthesis, characterization by spectroscopic, scattering, and imaging tools, thermochemical measurements, and theory to provide systematic data and generate fundamental understanding of the structure, bonding, and stability of these materials, with an emphasis on new materials in the SiBCN system, as well as PDCs in the SiCO, SiCN, and SiOCN systems. A specific goal is to understand the origin of the recently observed thermodynamic stability (exothermic heats of formation of ternary amorphous ceramics from binary crystalline end-members) over a large range of compositions in the SiCO and SiCON systems. The nature of the nanophase domains and their interfaces which contain silicon bonded to more than one type of anion may be the origin of such stability, but much more detailed structural models must be developed. These models must be consistent with nanostructural, spectroscopic and thermochemdynamic data, and must be guided by first principles calculations of structure and interactions at the nanodomain interfaces. Specifically, Riedel at Darmstadt will concentrate on synthesis, Navrotsky at UC Davis on calorimetric measurements and thermodynamic analysis, Kleebe at Darmstadt on electron microscopy, Sen at UC Davis on nuclear magnetic resonance and vibrational spectroscopy and x-ray and neutron scattering, and Galli at UC Davis on theoretical calculations.Broader Impacts: As a Materials World Network project, this brings together researchers in the U.S.A. and Germany and provides students and postdocs an opportunity to participate in both interdisciplinary and international materials research. A structured set of exchanges of researchers and workshops is planned. A number of women (including two of the three faculty from Davis) will participate in the project and young scientists from other underrepresented groups are being recruited. Because PDCs have a wide range of potential uses, ranging from automotive and aircraft engines to coatings, the results of this fundamental study will help advance ceramic science with practical applications.

智力优点：聚合物衍生的陶瓷（PDC）是一组广泛的X射线无定形但纳米纳米异质的材料，通过仔细的有机聚合物的热分解获得，可在受控的情况下提供硅，碳，氧气，氧气，氧气和/或硼。它们是轻巧的，具有出色的机械性能，并且在不结晶或降解接近1500 oC的情况下持续存在。 This project brings together groups in the U.S.A. and Germany with expertise in PDC synthesis, characterization by spectroscopic, scattering, and imaging tools, thermochemical measurements, and theory to provide systematic data and generate fundamental understanding of the structure, bonding, and stability of these materials, with an emphasis on new materials in the SiBCN system, as well as PDCs in the SiCO, SiCN, and SiOCN systems.一个具体的目标是了解最近观察到的热力学稳定性（从二元晶体末端成员中形成三元无定形陶瓷的放热热量）在SICO和SICON系统中的各种组合物上。纳米相结构域及其界面的性质可能是这种稳定性的起源，但必须开发出更详细的结构模型。这些模型必须与纳米结构，光谱和热动力学数据一致，并且必须通过对纳米域界面处的结构和相互作用的第一原理计算来指导。具体而言，达姆施塔特（Darmstadt）的里德尔（Riedel项目，这汇集了美国和德国的研究人员，并为学生和博士后提供了参与跨学科和国际材料研究的机会。计划了一组结构化的研究人员和研讨会。许多妇女（包括戴维斯的三名教师中的两名）将参加该项目，来自其他代表性不足的群体的年轻科学家正在招募。由于PDC具有广泛的潜在用途，从汽车和飞机发动机到涂料，因此这项基本研究的结果将有助于通过实际应用来推动陶瓷科学。

项目成果

Nanostructure and Energetics of Carbon-Rich SiCN Ceramics Derived from Polysilylcarbodiimides: Role of the Nanodomain Interfaces

• DOI: 10.1021/cm2038238
• 发表时间: 2012-03
• 期刊: Chemistry of Materials
• 影响因子: 8.6
• 作者: S. Widgeon;Gabriela Mera;Yan Gao;E. Stoyanov;S. Sen;A. Navrotsky;R. Riedel

Effect of demixing and coarsening on the energetics of poly(boro)silazane-derived amorphous Si–(B–)C–N ceramics

分层和粗化对聚（硼）硅氮烷衍生的无定形 Siâ(Bâ)CâN 陶瓷能量学的影响

• DOI: 10.1016/j.scriptamat.2013.04.022
• 发表时间: 2013
• 期刊: Scripta Materialia
• 影响因子: 6
• 作者: Yan Gao;Scarlett Widgeon;Tien B. Tran;Amir H. Tavakoli;Gabriela Mera;Sabyasachi Sen;Ralf Riedel;Alexandra Navrotsky
• 通讯作者: Alexandra Navrotsky

Thermal decomposition of carbon-rich polymer-derived silicon carbonitrides leading to ceramics with high specific surface area and tunable micro- and mesoporosity

• DOI: 10.1016/j.jeurceramsoc.2011.08.020
• 发表时间: 2012-02
• 期刊: Journal of The European Ceramic Society
• 影响因子: 5.7
• 作者: R. M. Prasad;Gabriela Mera;K. Morita;K. Morita;M. Müller;H. Kleebe;A. Gurlo;C. Fasel;R. Riedel

Processing route dramatically influencing the nanostructure of carbon-rich SiCN and SiBCN polymer-derived ceramics. Part I: Low temperature thermal transformation

• DOI: 10.1016/j.jeurceramsoc.2011.09.012
• 发表时间: 2012-07-01
• 期刊: JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
• 影响因子: 5.7
• 作者: Gao, Yan;Mera, Gabriela;Riedel, Ralf
• 通讯作者: Riedel, Ralf