反应合成原位（In—Situ）复合材料制备技术进展

在现有的复合材料制备技术中，反应合成原位复合材料制备技术具有显著的技术优势和经济优势，它的研究已成为当今复合材料领域的前沿课题。本文综合评述了这种复合材料制备亲技术。     

铁基复合材料涂层的原位反应合成

本文利用熔铸法研究了铁基复合材料的反应合成工艺和显微组织.结果表明:用液相原位反应合成法制备TiC/Fe基复合材料涂层是可行的;反应合成的TiC颗粒增强的Fe基复合材料涂层与基体没有明显的界面,涂层与基体结合状态良好;保温时间是影响TiC颗粒的大小、数量、及涂层厚度的重要因素之一.基体合金中含Ti为4%的样品保温2分钟后涂层厚度约为250μm,而保温7分钟后涂层厚度约为400μm,运用动力学计算对涂层厚度进行了理论计算,计算结果与实验结果的变化规律相似.     

原位反应复合法制备金属基复合材料的进展

综述了近年来利用原位反应复合法制备金属基复合材料的最新工艺方法，包括：ＸＤ法、ＶＬＳ法、ＳＨＳ等，讨论其组织与性能，同时还展望了原位反应复合法的发展前景。     

金属基复合材料的反应合成技术

综述了金属基复合材料的新型生产工艺－反应合成技术的现状及发展概况，重点介绍了铸造、粉末冶金、喷射沉积三种工艺过程中的反应合成技术，讨论了存在的相关问题。     

原位反应铜基复合材料制备工艺

用原位反应法制备了氧化物颗粒增强铜锆基（Ａｌ２Ｏ３＋Ｃｕ２Ｏ）／Ｃｕ－Ｚｒ复合材料，并对其组织和性能进行了研究。结果表明，复合材料增强相分布均匀，尺寸细小，体积分数随反应温度和时间的不同，可以在５％￣１５％内调节，铸态显微硬度可达１０４．１。最后讨论了热处理及形变处理对复合材料组织和性能的影响。     

原位反应制备颗粒增强钛基复合材料的研究进展

原位反应制备的颗粒增强钛基复合材料中增强颗粒与基体的相容性好,复合材料高温性能稳定,成为制备高性能颗粒增强钛基复合材料的首选途径.目前,粉末冶金法、熔铸法、放热弥散法、燃烧合成法和机械合金化法都已用于原位反应制备颗粒增强钛基复合材料.综述了这些制备方法的原理、特点以及制备出的复合材料的组织和性能,指出了原位反应制备颗粒增强钛基复合材料今后的发展方向.     

原位反应在铸造法制备复合材料中的应用

铸造技术是制备金属基复合材料的一种有效手段,利用反应在铸造过程中原位生成增强相,可避免传统方法中增强相颗粒表面污染的现象,从而改善增强相颗粒与基体相的结合,并可获得细小的增强相颗粒,提高材料性能。     

原位反应复合法制备金属基合材料的进展

综述了近年来利用原位反应复合法制备金属基复合材料的最新工艺方法，包括：ＸＤ法、ＶＬＳ法、ＳＨＳ等。讨论其组织与性能，同时还展望了原位反应复合法的发展前景。     

颗粒增强铝基原位复合材料

原位反应合成的颗粒增强铝基复合材料的弹性模量，比强度和高温强度均高，是航空，汽车工业上很有发展潜力的新型结构材料。综述了它的制备方法，组织结构及力学性能方面的研究进展。     

自蔓延高温原位合成ZrC/Cu复合材料

采用自蔓延高温合成工艺,原位合成了ZrC/Cu复合材料.利用DTA、XRD、FE-SEM等手段,研究了自蔓延高温合成ZrC/Cu复合材料的反应行为.实验结果表明,随着Cu含量的增加,Cu-Zr-C体系的燃烧温度逐渐降低,且合成产物中ZrC颗粒尺寸亦随之减小,其形貌从不含Cu时的无规则的大块状转变为含30%(质量分数)Cu时的纳米级的小球状.ZrC/Cu复合材料中只有ZrC颗粒和Cu两相存在,并无Cu-Zr中间相形成.DTA热分析的结果显示反应起始于912℃时生成的Cu10Zr7中间亚稳相,然后在987℃生成CuZr2中间相,当温度达到1022℃,将会生成部分的ZrC,继续加热到1098℃,Cu开始熔化,最后温度为1232℃时,Zr与C发生剧烈反应从而合成大量的ZrC.     

莫来石基复合材料的研究进展

由于莫来石材料的韧性、超塑性等性能较差，往往不能满足作为耐火材料、电子封装材料和光学材料等在工业中的使用要求，因而限制了它的进一步应用。本文就莫来石与堇青石、ZrO2、CNT、高硅氧玻璃、连续性纤维等改性制得莫来石基复合材料的研究进展现状进行了介绍，同时对它的发展前景进行了分析。     

Design,Fabrication, and Application of Thermostructural Composites (TSC) like C/C,C/SiC,and SiC/SiC Composites

The French company Snecma Moteurs is a leading producer of high‐performance composites for operation under high mechanical stress and at high temperature, such as in jet engines, aircraft brake disks, or even rocket propulsion systems. The author presents the different families and generations of carbon‐carbon and ceramic‐matrix composites developed by Snecma, and discusses their manufacture and characteristics.     

The Fabrication and Properties of the Squeeze-Cast TiN/Al Composites

Co-continuous TiN/Al composites with different volume fractions of Al phase have been fabricated by the squeeze-casting method. TiN porous ceramics with different porosities were fabricated through carbothermal reduction by changing the content of TiN and were used as preforms. The outstanding mechanical properties were attributed to the absence of excessive interface reaction between TiN and Al for the co-continuous TiN/Al composites. With the increase of Al content in the composites, the flexural strength and the microhardness decreased, and the fracture toughness increased. The strengthening and toughening mechanism of composites included dislocation strengthening, ductile rupture, crack deflection, and secondary cracks.     

原位增强镁基复合材料研究进展与原位反应体系热力学

本文综述了原位镁基复合材料制备方法的研究进展 ,并对原位镁基复合材料的可能的原位反应体系进行热力学分析     

Reaction Bonding of Three-Layer Alumina-Based Composites

Three-layer alumina-based composites with Al₂O₃-containing mullite as the outer layer and ZrO₂-containing alumina as the inner layer were fabricated by die-pressing and reaction bonding. The effects of the outer-layer compositions on the densification behavior of three-layer composites were investigated. The existence of residual stresses in the layers was verified using indentation methods. Compared with single-layer ceramics, three-layer composites exhibit an improved fracture toughness and an excellent damage resistance due to the presence of the compressive stresses in the outer layers.     

原位热压合成Nb掺杂Al2O3/TiAl复合材料

利用Al-Ti-TiO2-Nb2O5体系的放热反应,原位热压合成了Nb掺杂Al2O3/TiAl复合材料.借助DTA结合XRD探讨了Al-Ti-TiO2-Nb2O5体系的反应过程,并采用XRD、OM和SEM研究了复合材料的物相组成及显微结构.结果表明:Al熔化的同时,体系发生了Al和Nb2O5的铝热反应,生成了NbO2和Nb等中间产物,并放出了较多热量,这些热量促使Ti和Al较早化合生成TiAl3,随即引发Al和TiO2较早的还原反应,进而促使材料在较低温度下致密烧结;产物由γ-TiAl、α2-Ti3Al、Al2O3和NbAl3相构成,Al2O3颗粒分布于基体交界处,存在一定的团聚;Nb2O5的引入,对基体γ-TiAl相和α2-Ti3Al相的的分布有一定的影响,使得基体晶粒细化,较好地改善了材料的力学性能.     

Fabrication and Machining of Metal Matrix Composites: A Review

Intrinsically smart, metal matrix composites (MMCs) are lightweight and high-performance materials having ever expanding industrial applications. The structural and the functional properties of these materials can be altered as per the industrial demands. The process technologies indulged in fabrication and machining of these materials attract the researchers and industrial community. Hybrid electric discharge machining is a promising and the most reliable nonconventional machining process for MMCs. It exhibits higher competence for machining complex shapes with greater accuracy. This paper presents an up-to-date review of progress and benefits of different routes for fabrication and machining of composites. It reports certain practical analysis and research findings including various issues on fabrication and machining of MMCs. It is concluded that polycrystalline tools and diamond-coated tools are best suitable for various conventional machining operations. High speed, small depth of cut and low feed rate are a key to better finish. In addition, hybrid electrical discharge machining has proved to be an active research area in critical as well as nonconventional machining since last few years. This paper incorporates year-wise research work done in fabrication, conventional machining, nonconventional machining, and hybrid machining of MMCs. Conclusions and future scope are addressed in the last section of the paper.     

紫外光辐照双原位同步合成纳米Ag/PVP复合物的结构特征

在室温下,用紫外光辐照N-乙烯基吡咯烷酮(NVP)和硝酸银(AgNO3)水溶液,双原位一步合成了纳米银/聚乙烯吡咯烷酮(PVP)复合物。透射电镜(TEM)分析表明,纳米银/PVP复合物分散性好、粒径在5 nm左右;X射线光电子能谱(XPS)表明,C=O中C1s结合能(285.61 eV)比标准C=O中C1s结合能(287.79 eV)降低了2.18 eV,N1s的结合能比标准的能谱峰位(399.88 eV)降低了0.38 eV;红外光谱(FT-IR)表明,纳米Ag/PVP羰基吸收峰,峰位从1673 cm-1变化到1661 cm-1,发生红移;XPS和FT-IR分析表明,纳米银不仅和羰基氧有相互作用,而且通过p-π共轭效应,与氮和羰基碳也发生了相互作用。     

Synthesis of C_f/TiAl_3 Composite by Infiltration-In Situ Reaction

Infiltration-in situ reaction synthesis of Cf /TiAl3 composite was investigated. The as-cast material was obtained by titanium particles, carbon fibers and pure aluminum. Titanium particles and carbon fibers were mixed and pressed to form a preform firstly, and then molten pure aluminum was pressed into the preform, subsequently, cooled rapidly. In situ reaction samples were obtained by heating the as-cast material from 600 to 1000 °C for 1 h. The microstructural evolution of in situ reaction samples was an...