基于铝粉为原料制备的三元碳化物Al4SiC4的研究进展

本文综合介绍Al4SiC4的最新研究进展。三元碳化物Al4SiC4属于六方晶体结构，空间群为P63mc,它具有优异的的高温抗氧化性能；优良的热稳定性和良好的室温及高温力学性能等。     

新型层状陶瓷Ti3SiC2的研究进展

新型层状陶瓷Ti3SiC2兼有金属和陶瓷的许多优良性能，具有高的热导率和电导率，易加工，同时具有良好的抗热震性、抗氧化性和高温稳定性。本文从层状陶瓷Ti3SiC2制备方法、结构和性能等方面进行综述，并对其应用前景进行展望。     

高性能陶瓷材料Ti3SiC2 的研究进展

新型层状陶瓷Ti2SiC2兼有金属和陶瓷的许多优良性能，具有高的热导率和电导率，易加工．同时具有良好的抗热震性、抗氧化性和高温稳定性。从层状陶瓷Ti3SiC2的制备方法、结构性能等方面进行了综述，对其应用前景进行展望。     

TiO2纳米管制备及其应用研究进展

就TiO2纳米管的制备方法以及在环境治理、化妆品、气敏传感器、太阳能电池等方面的应用作一综合评述,分析了其制备方面存在的问题,并提出对策。     

新型层状陶瓷Ti3SiC2的研究进展

新型层状陶瓷Ti3SiC2兼有金属和陶瓷的许多优良性能,具有高的热导率和电导率,易加工,同时具有良好的抗热震性、抗氧化性和高温稳定性.本文从层状陶瓷Ti3SiC2制备方法、结构和性能等方面进行综述,并对其应用前景进行展望.     

生物SiC多孔陶瓷的研究进展

介绍了生物SiC多孔陶瓷的研究现状,并对生物碳模板的分类、制备方法进行了详尽的叙述,同时对生物SiC多孔陶瓷的各项性能进行了综述,最后对生物SiC多孔陶瓷的发展趋势作了总结。     

BN纳米管制备综述

BN纳米管具有较宽的带隙,且不随它的直径、螺旋性和层数的变化而变化,因此是一种很好的半导体材料.本文综述了BN纳米管的结构和几种制备方法.     

新型电刷材料Ti3SiC2的合成与研究进展

介绍了一种新型的电刷材料-Ti3SiC2陶瓷。Ti3SiC2结合了金属和陶瓷的许多优异性能，既具有与金属相似的良好的导热、导电性，良好的可加工性，相对柔软，抗热震性好，可塑性变形等；同时又具有与陶瓷相似的抗氧化、耐腐蚀、耐高温等特性，并且还有很好的自润滑性和超低摩擦系数，被认为在许多领域有着广泛的应用前景。     

纳米管合成研究进展

当今纳米科学技术飞速发展，其中纳米管已构成了纳米材料的一个非常重要的类别。本文介绍近几年来由化学键结合的纳米管以及由分子间力形成的一些纳米或具有中观尺度的管状结构材料的合成研究进展。     

核用SiCf/SiC复合材料研究进展

核用SiC_f/SiC复合材料是国际上材料研究的一个热点,本文简要介绍了SiC_f/SiC复合材料的制备工艺,重点综述了SiC_f/SiC复合材料的抗辐照性能和耐腐蚀性能等方面的研究成果,详细介绍了SiC_f/SiC复合材料燃料包壳管的研究进展,并对核用SiC_f/SiC复合材料研究中需要关注的重点问题提出了几点思考。     

碳纳米管的研究进展

碳纳米管是具有由石墨层片卷成的管状结构的一种新型纳米材料,拥有独特的物理化学、电学、热学和机械性能,以及十分诱人的应用前景。对碳纳米管的制备方法、性质、用途及研究新动向进行了简要的综述。     

A chemo-mechanical coupled constitutive model applied to the oxidation simulation of SiC/SiC composite

Herein, a chemo-mechanical coupled constitutive and failure model is proposed to predict the tensile behavior of SiC/SiC composites under oxidizing environments. The diffusion of O₂ through the oxide scale and the oxidation reaction of SiC/O₂ are modeled and implemented in finite element software, through a user-defined element. Numerical validation studies and tests are conducted on a domestic SiC fiber. An orthotropic constitutive model for reinforcements, which considers modulus reduction due to oxidation damage, and a continuum damage model associated with O₂ diffusion along the micro-cracks in the SiC matrix are subsequently presented. The developed framework is used to simulate the mechanical behavior and oxidation process of a single fiber SiC/SiC composite.     

碳化硅陶瓷粉末制备的发展

本文简要的介绍了碳化硅原料制备技术的进展，着重描述八十年代后期运用Ｌａｓｅｒ，Ｐｌａｓｍａ，ＣＶＤ等技术高温裂解有机物和Ｓｏｌ－Ｇｅｌ等方法制备超细，超纯，复相碳化硅陶瓷粉末的方法与性能，以期获得高性能的碳化硅结构陶瓷。     

Preparation of SiC/SiC composites with high toughness by reaction of the SiCP+C double-cladding layer with liquid silicon

SiC/SiC composites prepared by liquid silicon infiltration (LSI) have the advantages of high densification, matrix cracking stress and ultimate tensile strength, but the toughness is usually insufficient. Relieving the residual microstress in fiber and interphase, dissipating crack propagation energy, and improving the crystallization degree of interphase can effectively increase the toughness of the composites. In this work, a special SiC particles and C (SiC_P +C) double-cladding layer is designed and prepared via the infiltration of SiC_P slurry and chemical vapor infiltration (CVI) of C in the porous SiC/SiC composites prepared by CVI. After LSI, the SiC generated by the reaction of C with molten Si combines with the SiC_P to form a layered structure matrix, which can effectually relieve residual microstress in fiber and interphase and dissipate crack propagation energy. The crystallization degree of BN interphase is increased under the effects of C-Si reaction exotherm. The as-received SiC/SiC composites possess a density of 2.64 g/cm³ and a porosity of 6.1%. The flexural strength of the SiC/SiC composites with layered structure matrix and highly crystalline BN interphase is 577 MPa, and the fracture toughness reaches up to 37 MPa·m^1/2. The microstructure and properties of four groups of SiC/SiC composites prepared by different processes are also investigated and compared to demonstrate the effectiveness of the SiC_P +C double-cladding layer design, which offers a strategy for developing the SiC/SiC composites with high performance.     

泡沫碳化硅陶瓷材料的研究进展

泡沫碳化硅陶瓷材料除了孔隙率高、比表面积大,还具有相对密度小、优良的热学、力学、电学、声学性能等特性,已经广泛应用于化工、机械、生物、环保等领域。本文总结了泡沫碳化硅陶瓷材料的主要制备技术,包括粉末烧结法、固相反应烧结法、含硅树脂热解法以及气相沉积法等。阐述了泡沫碳化硅陶瓷材料的几种优良特性,包括结构特征、流体阻力、抗氧化性、吸波性等。最后举例介绍了该陶瓷在催化、过滤、生物学等领域的应用现状,重点介绍了其作为塔内件在化工领域中的应用,指出为满足对泡沫碳化硅陶瓷更高性能的需求,不仅要对现有技术进行集成创新,更要挖掘和开发泡沫碳化硅的潜在优势。     

Ti3SiC2层状陶瓷的研究进展

Ti₃SiC₂层状陶瓷兼有金属和陶瓷的许多优良性能,具有高的热导率和电导率,易加工,同时具有良好的抗热震性、抗氧化性和高温稳定性。综合评述了Ti₃SiC₂陶瓷的结构、性能以及制备工艺,并对其在耐火材料行业中的应用前景进行了展望。     

Combustion synthesis of SiC/Al2O3 composite powders with SiC nanowires and their growth mechanism

SiC/Al₂O₃ composite powders with SiC nanowires were synthesized using a one-step combustion synthesis method taking silica fume (SiO₂), aluminum powder (Al) and carbon black (CB) as raw materials, while ferrocene (C₁₀H₁₀Fe) was used as the catalyst. The calculated results for the relationship between the equilibrium phase and temperature of the Al–SiO₂–C system show that SiC and Al₂O₃ are the only equilibrium phases in the system. In addition, the effects of C₁₀H₁₀Fe on the combustion synthesis process and products were studied. It was found that with increasing catalyst content, the amount of residual Si in the products first decreases and then increases, the combustion temperature first increases and then decreases, and the nanowire content continues to increase. For an optimal amount of C₁₀H₁₀Fe of 0.75 wt%, almost no residual Si is observed in the product, while the combustion temperature (T_c) is high (2104 K), the SiC nanowire content is relatively high, and the nanowire aspect ratio is large. In addition, two growth mechanism models for SiC nanowires: VS and VLS were validated.     

Microstructure and Mechanical Properties of (TiB2 + SiC) Reinforced Ti3SiC2 Composites Synthesized by In Situ Hot Pressing

Fully dense (TiB₂ + SiC) reinforced Ti₃SiC₂ composites with 15 vol% TiB₂ and 0–15 vol% SiC were designed and synthesized by in situ reaction hot pressing. The increase in SiC content promoted densification and significantly inhibited the growth of Ti₃SiC₂ grains. The in situ incorporated TiB₂ and SiC reinforcements showed columnar and equiaxed grains, respectively, providing a strengthening–toughening effect by the synergistic action of particulate reinforcement, grain's pulling out, “self‐reinforcement,” crack deflection, and grain refining. A maximum bending strength of 881 MPa and a fracture toughness of 9.24 MPam^1/2 were obtained at 10 vol% SiC. The Vickers hardness of the composites increased monotonously from 9.6 to 12.5 GPa.     

SiC反射镜表面改性研究进展

采用SiC陶瓷作反射镜是目前国际上的一个研究热点。但是SiC陶瓷用作反射镜时存在各种类型的缺点,必须对SiC反射镜表面进行改性。本文综述了各种表面改性方法、制备机理以及优缺点,最后展望了未来SiC反射镜的发展方向：即低成本化和大型化。     

碳纳米管表面功能化研究进展

碳纳米管的表面功能化修饰已成为现代纳米领域的一大研究热点,对实现碳纳米管的独特约优越性起到基础性作用。文章筒述了碳纳米管（CNTs）的结构与制备方法,对碳纳米管常见的功能化修饰进行了综述,最后对碳纳米管改性高分子材料存在的问题和发展方向进行了展望。