氧化铝陶瓷增韧研究进展

介绍了氧化铝陶瓷增韧技术及其机理,包括相变增韧、晶须和纤维增韧、颗粒弥散增韧、微结构设计增韧、纳米技术增韧、耦合协同增韧;探讨了氧化铝陶瓷材料增韧技术的研究现状和今后的发展方向。     

Al2O3陶瓷材料的增韧

氧化铝陶瓷因脆性而限制了其广泛应用。本文对目前氧化铝瓷的增韧方法及主要机理进行了评述，主要有层状复合增韧、纳米复合增韧、纤维（晶须）增韧、自增韧等。其中复合增韧是主要手段。而且纳米技术和微观结构设计将是今后氧化铝提高韧性的发展方向。     

金属增韧氧化铝基耐火材料的研究进展

综述了金属增韧氧化铝基耐火材料的研究概况,并介绍了金属增韧氧化铝基耐火材料的增韧机理和过渡塑性相工艺的研究进展。认为金属增韧氧化铝基耐火材料具有一定的应用前景。     

一种氧化锆增韧莫来石陶瓷材料及制备方法

本发明涉及一种氧化锆增韧莫来石陶瓷材料及制备方法。采用硅酸锆和α相氧化铝为基体,运用现代增韧和增强技术,加入氧化钇、氧化镁、氧化钙和氧化钛为矿化剂,外加莫来石作晶种,改性增强增韧。采用等静压成型技术,使生坯体具有均匀性和致密性。在烧结工艺中采用常压高温抽屉窑一次性烧成,温度均匀且成本低。本发明与氧化铝陶瓷材料相比,具有高强度、高韧性、高耐磨性能,     

金属颗粒增韧氧化铝陶瓷研究现状

概述了金属颗粒增韧氧化铝陶瓷的研究进展,对氧化铝/金属复合材料的研究现状、增韧机理及制备方法进行了介绍,并对氧化铝/金属复合材料的主要发展方向进行了分析预测。     

添加剂自增韧氧化铝陶瓷的若干研究进展

评述了近年来国内外对添加剂自增韧氧化铝陶瓷的研究，总结了国内外关于TiO2影响氧化铝晶粒生长的诸多不同观点，分析了氧化铝晶粒异向生长与氧化铝陶瓷的自增韧机理。     

氧化锆增韧氧化铝陶瓷复合粉体的研究进展

综述了氧化锆／氧化铝增韧复合陶瓷的增韧机制、复合粉体的制备工艺和ZTA陶瓷应用方面的研究进展。     

正交试验法在新型陶瓷材料研究中的应用

借助正交试验设计法研究了ＺｒＯ２（Ｙ２Ｏ３）的制粉工艺、稳定剂含量、ＺｒＯ２加入量及注浆成形工艺对氧化锆氧化铝（ＺＴＡ）陶瓷材料力学性能的影响，并探讨了材料中存在的增强增韧机理及其作用效果。统计计算结果进一步证实了微裂纹增韧和应力诱导相变增韧是ＺＴＡ材料中两种主要的增韧机制。     

氧化铝结合氮化钛复合材料的强韧性研究

Al2O3-TIN复合材料具有耐高温高压、抗氧化、耐磨损等优良性能,但较低的韧性一直是其得到进一步应用的瓶颈。通过相变增韧、复合增韧以及自增韧等方法对Al2O3-TIN复合材料增韧研究进行了分类叙述,总结了高韧性氧化铝结合氮化钛复合材料的制备、增韧机理以及影响因素的研究进展。     

陶瓷材料增韧技术及其韧化机理

介绍了陶瓷材料增韧技术及其机理（包括相变增韧、晶须和纤维增韧、颗粒弥散增韧、微结构设计增韧、纳米技术增韧、协同增韧）。探讨了陶瓷材料增韧技术的研究现状和今后的发展方向。     

Al2 O3基陶瓷材料的增韧研究进展

Al2 O3基陶瓷因其脆性限制了该项材料的使用范围。本文主要结合国内外陶瓷增韧技术研究现状,详细阐述了陶瓷脆性的由来和陶瓷增韧方法及相关机理。探讨了目前增韧方法的优缺点和未来发展方向。     

压电陶瓷颗粒增韧陶瓷基复合材料研究进展

本文综述了压电陶瓷颗粒增韧陶瓷基复合材料的研究进展,重点讨论了增韧机理、极化及不同工艺对增韧效果的影响.分析认为,研究一种低成本、烧结性能较好且能够与基体稳定共存的压电材料,以及能够获得最佳性能的合适的制备工艺是目前的研究趋势,具有广阔的发展前景.     

A Novel Processing Route to Develop a Dense Nanocrystalline Alumina Matrix (<100 nm) Nanocomposite Material

A dense 3-mol%-yttria-stabilized tetragonal zirconia polycrystalline (3Y-TZP) toughening alumina matrix nanocomposite with a nanocrystalline (<100 nm) matrix grain size has been successfully developed by a novel processing method. A combination of very rapid sintering at a heating rate of 500°C/min and at a sintering temperature as low as 1100°C for 3 min by the spark-plasma-sintering technique and mechanical milling of the starting γ-Al₂O₃ nanopowder via a high-energy ball-milling process can result in a fully dense nanocrystalline alumina matrix ceramic nanocomposite. The grain sizes for the matrix and the toughening phase were 96 and 265 nm, respectively. A great increase in toughness almost 3 times that for pure nanocrystalline alumina has been achieved in the dense nanocomposite. Ferroelastic domain switching without undergoing phase transformation in nanocrystalline t -ZrO₂ is likely as a mechanism for enhanced toughness.     

Nanoplates forced alignment of multi-walled carbon nanotubes in alumina composite with high strength and toughness

Although the strengthening and toughening effects on ceramic composites are expected to be maximized by alignment of multi-walled carbon nanotubes (MWCNTs) in matrices, this concept has been rarely realized in practice due to the lack of convenient processing strategy. Here, the alignment of MWCNTs in alumina composite can be readily obtained by using α-Al₂O₃ nanoplates as raw powder. With the assistance of vacuum filtration and pressure in sintering, the highly aligned MWCNTs in alumina matrix are formed in in-plane direction. Accordingly, the strength and toughness in 1.5 wt% MWCNTs/alumina composite are improved by 58 % and 66 % with respect to monolithic alumina, respectively. Transmission electron microscopy observation reveals that the MWCNTs under great compressive residual stress are mainly embedded inside the grains, leading to much stronger grain boundaries. Meanwhile, the toughening effect is mainly attributed to the highly energy dissipating bridging and pullout, owing to the very effective load transfer.     

Fracture Toughness Enhancement for Alumina Systems: A Review

Investigations have been carried out to determine ways of tailoring ceramic materials in order that one or more toughening mechanisms are activated in service. Microstructural manipulations, as well as composite formulations involving metallic, intermetallics, and ceramic phases have been used with ceramic matrices. Macrostructurally, laminated structures and functional gradient materials (FGMs) have also been formulated to enhance mechanical properties. Although significant improvements in material properties have been reported, ceramics are still below their projected positions on the materials map. This article presents a review of research activities pursuant to improving fracture toughness of alumina matrix systems and the enhancements achieved.     

Toughening mechanism of alumina-matrix ceramic composites with the addition of AlTiC master alloys and ZrO2

Titanium carbide and aluminium are introduced in alumina matrix in the form of AlTiC, which is a kind of master alloy. Alumina-matrix ceramic composites are prepared by using transient liquid phase and hot-press sintering. Significant improvements in mechanical properties have been attained due to the good toughening effect of AlTiC master alloys and ZrO₂. The microstructures and toughening mechanisms of the fabricated alumina-matrix ceramic materials are analysed using a scanning electron microscope, a transmission electron microscopy and an electron probe microanalysis, respectively. Results show that the microstructures of “intracrystalline shape” and “intercrystalline shape” are formed and “sublattice” exists in the composites, which may extend crack path and restrain intracrystalline failure, thus improving the fracture toughness of the composites.     

相变增韧和层状复合协同强韧化Al2O3陶瓷

本文采用相变增韧和层状复合协同强韧化Ａｌ２Ｏ３复合陶瓷,相变增韧制备出ＺＴＡ陶瓷,在此基础上,采用层状复合工艺,制备出ＺＴＡ／ＢＮ陶瓷。研究结果表明：相变增韧和层状复合协同强韧化Ａｌ２Ｏ３能基本保持陶瓷抗弯强度,冲击韧性提高了３７倍。     

陶瓷材料增韧机理的研究进展

脆性是制约陶瓷材料发展的主要因素,因此陶瓷的增韧是陶瓷材料研究领域的核心问题.本文重点介绍了陶瓷材料增韧技术,分析了陶瓷材料的增韧机理.最后,探讨了陶瓷材料增韧技术的研究现状和今后的发展方向.