纳米复相陶瓷

本文简要介绍了纳米复相陶瓷、纳米复相陶瓷力学性能，着重分析了纳米Ｓｉ３Ｎ４－ＳｉＣ复相陶瓷显微结构特点，同时展望了今后纳米复相陶瓷的研究重点。     

纳米复相陶瓷

纳米复相陶瓷以其优异的性能受到大家的关注，成为陶瓷研究领域的研究热点。本文在介绍纳米复相陶瓷分类、材料设计和制备的同时，着重阐述了纳米复相陶瓷中纳米颗粒对材料的显微结构和性能的影响。     

纳米复相陶瓷

纳米复相陶瓷已成为陶瓷研究领域的研究热点，本文综述了纳米复相陶瓷的分类、材料设计、粉体制备、烧结及增韧机理。     

纳米复相陶瓷研究进展

介绍了制备纳米复相陶瓷的方法。对纳米复相陶瓷的研究进展进行了综合评述。     

纳米陶瓷的特性和烧结

本文介绍了纳米陶瓷新颖的性能和特殊的烧结方法,阐述了这些特殊烧结方法的烧结机理。同时也对纳米复相陶瓷的性能和制备方法进行了介绍,并对纳米陶瓷今后的研究进行了展望。     

纳米复相陶瓷

本文介绍了纳米复相陶瓷的制备方法，性能以及显微结构，并对其增韧机制和研究现状作了概述。     

纳米复相陶瓷研究动态

20世纪80年代中期发展起来的纳米复相陶瓷，对陶瓷材料的性能产生重大的影响，为材料的利用开拓了一个新的领域，已成为材料科学研究的热点之一。综述了纳米复相陶瓷新近的研究动态，介绍了其制备方法和性能。     

纳米复合陶瓷

纳米复合陶瓷可分为四种类型:分散型、梯度型、被复型和纳米一纳米复合。纳米复合微粒的制备有气相法、液相法和固相法。分散型和被复型纳米复合陶瓷的室温韧性和强度约提高2—5倍,其高温硬度、韧性、强度、蠕变、疲劳断裂强度、热冲击特性等亦得到显著改善。纳米一纳米复合材料具有可加工性和起塑性等新功能。本文评价和探讨了纳米复合陶瓷的力学性能和纳米尺寸分散的作用。     

Si3N4／纳米SiC复相陶瓷的研究

采用纳米ＳｉＣ粉体制备了Ｓｉ３Ｎ４／纳米ＳｉＣｐ复相陶瓷。研究了制备工艺、纳米ＳｉＣ含量对材料性能及显微结构的影响,并对材料显微结构特点与强韧化机制进行了分析 。结果表明：添加２０ｖｏ％〈１００ｎｍ的ＳｉＣ粉体时,复相陶瓷的室温抗弯强度达８５６ＭＰａ,当添加１０ｖｏ％上述ＳｉＣ粉体时,复相陶瓷的增韧效果最佳,断裂韧性达８．２７ＭＰａｍ＾１／２,比基体材料提高了２３％。     

纳米复相陶瓷的制备及性能研究进展综述

本文综述了纳米复相陶瓷的研究进展。介绍了纳米复相陶瓷的分类及制备技术,详细地阐述了纳米复相陶瓷的力学性能和微观结构,分析了提高其断裂强度、断裂韧性及抗蠕变性等性能的机理。     

Advanced ceramics and coatings for erosion-related applications in mineral and oil and gas production: A technical review

The applications of advanced ceramics, composites and coatings in mineral, mining, fuel production, and processing are reviewed. The materials include oxide and non-oxide ceramics (specifically SiC-based), ceramic–ceramic, and ceramic–metal composites, coatings on metallic components where functional application properties can be achieved. Some principles of materials selection, specifically for erosion wear and corrosion applications, and manufacturing are considered. The examples of the successful development and processing of ceramics, coatings, and composites with manageable structures and phase compositions, in the erosion-related applications, particularly conducted by the author, are discussed and reviewed. Specifically, industrially employed types of ceramics and processing routes were focused on the considered applications. Particular demands for advanced materials with high reliability and complex shapes or for protective coatings on complex shape steel components and long tubing with inner surface protection require novel and optimized processing. The factors affecting erosion and erosion–corrosion resistance and the paths for the erosion resistance enhancement of ceramic and coating materials are considered. Ceramic components design, technology, and installation features are reviewed.     

陶瓷表面化学镀Ni-P合金工艺的研究

陶瓷表面经化学镀镍处理后既可以保证陶瓷原有的机械物理性能,又可以使陶瓷具有导电、导热、耐蚀等性能.采用正交实验的方法,得出陶瓷表面化学镀镍的最佳工艺配方和条件.采用扫描电子显微镜观察镀层微观形貌,利用能谱仪分析其化学成分,通过热震实验测试镀层与陶瓷的结合力.结果表明:陶瓷表面镀层覆盖完整、均匀、致密,镀层与陶瓷结合良好...     

碳化硅基材料抗氧化涂层的研究进展

碳化硅基材料具有优良的高温性能,但作为非氧化物陶瓷,碳化硅材料的高温氧化造成的性能衰减限制了其进一步的广泛应用.本文通过分析碳化硅的氧化机理,对比和总结了碳化硅抗氧化涂层的制备方法和涂层体系,并结合实际工作对碳化硅抗氧化涂层的研究提出了具体的见解.     

特种陶瓷的发展与展望

本文回顾了陶瓷材料的发展历史,着重评述了特种陶瓷如工程结构陶瓷、陶瓷基复合材料、生物陶瓷、功能陶瓷等的发展现状,并展望了特种陶瓷的未来发展。     

航天飞行器热防护系统技术综述

综述表明,C/C和C/SiC复合材料是宇宙输送系统飞行器前端部位热防护系统的最佳材料选择,多层抗氧化涂层、超高温陶瓷(UHTC)涂层、UHTC基体改性是提高其高温长期使用的有效途径。指出多层UHTC涂层、纳米级UHTC颗粒、火花等离子浇结(SPS)及碳气凝胶填充碳泡沫新型热防护结构等在高温热防护材料方面已显现出实际应用方向。     

Investigations of TaB2 on oxidation-inhibition property and mechanism of Si-based coatings in aerobic environment with broad temperature region for carbon materials

To investigate the formation mechanism of the dendrites glass-ceramics and the effect of TaB₂ modifier on the oxidation-inhibition ability of Si-based coatings in aerobic environment with broad temperature region for carbon materials, the Si-based coatings modified with different TaB₂ content were fabricated by the liquid phase sintering method. The fabricated coatings and its corresponding composite powders were investigated in dynamic TG aerobic environments up to 1500 ℃. The initial oxidation temperatures of Si-based coatings modified with TaB₂ powders are almost completely suppressed to 800 ℃. With the increase of TaB₂ phase content, the relative oxygen permeability of the Si-based coatings is significantly reduced, which can be interpreted as the generation of liquid boride, silicide and Ta-Si-B-O compound glass ceramics those can improve the stability of the coating. The formation mechanism of the dendrites glass-ceramics was illustrated.     

纳米复合涂料的发展现状及未来发展趋势

综述了国内外纳米复合涂料在各方面的应用和发展现状,指出了其发展中需要解决的问题和发展趋势。     

电子陶瓷材料介电功能应用研究现状与前瞻

电子陶瓷如压电陶瓷、铁电陶瓷等作为一种广泛采用的敏感材料广泛应用于光电子等领域，本文对其当前应用的现状进行了回顾，介绍了压电陶瓷在超声马达、汽车陶瓷传感器、压电振动陀螺仪、压电陶瓷微位移器、扫描显微镜等中的应用，介绍了铁电陶瓷在微波通讯中的应用，并对未来的趋势提出了展望。     

Investigation of nano particle additives on lithium doped KNN lead free piezoelectric ceramics

Lead free potassium sodium niobate modified piezoelectric ceramics were synthesized through conventional mixed oxide method. Crystal structure and microstructure were analyzed by X-ray diffraction and scanning electron microscopy (SEM). The effects of nano ZnO, CuO and SnO₂ additives as the nano scale sintering aids, on microstructure and electrical properties of (K₀₅₀Na_0.50)_0.94Li_0.06NbO₃ (KNNL-6) ceramics were investigated. The optimum dielectric and piezoelectric properties of ?_r = 560, d₃₃ = 215 pC/N and tan δ = 0.008 were obtained for pure KNNL-6 that sintered at 1000 °C for 2 h. The results show that with addition of nano particle sintering aids, the piezoelectric coefficient d₃₃ of (K₀₅₀Na_0.50)_0.94Li_0.06NbO₃ ceramics was decreased. The decrease in piezoelectric charge coefficient could be due to the hardening effect, which lowers the piezoelectric charge.     

纳米陶瓷材料及其制备与应用

由于硬度高、耐高温、耐磨损、质量轻和导热性好，陶瓷材料是现代工业三大基本材料之一，但其脆性大、韧性小而限制了在一些特殊领域的应用。纳米材料及技术运用到陶瓷材料中极大地改善了它的应用性能。本文比较了传统陶瓷与纳米陶瓷的优缺点，介绍了纳米陶瓷材料材料的特性和种类，以及制备方法、应用和国内研究现状。