颗粒增强钛基复合材料研究新进展

颗粒增强钛基复合材料具有高比强度、低密度、高弹性模量等特点，成为钛基复合材料的发展趋势。目前日本的Toyota公司采用粉末冶金技术制备了原位反应生成的TiB颗粒增强钛基复合材料，已在汽车发动机进、排气阀等部件得到应用。美国Dynamet公司开发了颗粒增强钛基复合材料CermeTi系列，利用其好的耐磨性能在军事、汽车、体育、医疗器械方面进行了开发。我国西北有色金属研究院研制出了性能优异的TP-650钛基复合材料，并且上海交通大学等亦在原位反应法方面作出了较好的结果。     

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.     

铝基复合材料凝固与成形一体化技术

针对铝基复合材料塑性成形困难、增强相与基体金属界面相容性差的问题,提出铝基复合材料凝固与成形一体化技术,实现了铝基复合材料管材、线材和型材的连续近终形成形,并改善粒子相与铝界面相容性和强化作用,达到短流程,低能耗成形的目的.研究了铝基复合材料连续凝固与成形过程的组织演化规律和制品性能,优化了凝固成形条件.     

Fe-Al金属间化合物基复合材料的研究进展

对Fe-Al金属间化合物基复合材料及相关领域的研究现状进行了综合评述。着重介绍了增强相与基体界面的相容性、连续纤维及颗粒增强Fe-Al金属间化合物基复合材料的制备工艺和弥散强化Fe-Al金属间化合物基纳米复合材料的合成与烧结，以及Fe-Al金属间化合物基复合材料的力学性能等方面取得的研究成果。并就目前研究的不足以及该研究领域的发展方向提出了一些看法。     

成形温度对SiCP/Al复合材料性能的影响

采用粉末冶金的方法制备12%SiC_p/6066Al(体积分数)复合材料,研究了热压与热挤压成形温度对复合材料性能的影响。结果表明,热挤压有利于SiC颗粒在基体中的再分布且是粉末冶金法制备SiC颗粒增强铝基复合材料的必要工艺,而热压则有利于提高增强颗粒与基体的界面结合强度;在高于基体固相点温度热压烧结而低于固相点温度热挤压时,金属基体强度高且界面结合牢固,复合材料的性能最佳。本工艺中12%SiCp/6066Al的最佳热压温度为560℃,热挤压温度为430℃。     

高性能SiC增强Al基复合材料的显微组织和热性能

采用模压成型和无压浸渗工艺制备了高体积分数SiC增强Al基复合材料(AlSiC),对其物相和显微结构进行研究。结果表明:用上述方法制备的AlSiC复合材料组织致密,两种粒径的SiC颗粒均匀分布于Al基质中,界面结合强度高;SiC增强颗粒与Al基质界面反应控制良好,未出现Al4C3等脆性相。分析指出:Al合金中Si元素的存在有利于防止脆性相Al4C3的形成,Mg元素的加入提高了Al基体和SiC增强体之间的润湿性。所获得复合材料的平均热膨胀系数为9.31×10 6K 1,热导率为238 W/(m.K),密度为2.97 g/cm3,表现出了良好的性能,完全满足高性能电子封装材料的要求。     

非连续增强铝基复合材料的研究与应用进展

非连续增强铝基复合材料具有高比强度、高比模量、高导热、低热膨胀、耐磨、耐辐射等优异的综合性能,在航空、航天、空间、电子、信息、先进武器等高技术领域有重要的应用和巨大的应用潜力。主要介绍了非连续增强铝基复合材料的主要制备方法、性能特点、热加工处理,以及国内外在航天航空、电子信息、汽车等领域中的应用进展。     

一种SiC陶瓷支架增强铸铁基复合材料的制备(英文)

提出了一种基于一系列材料处理技术的新颖方法来制备SiC陶瓷支架增强铸铁基复合材料。考察了该复合材料的界面行为和磨损性能。结果表明:对具有分级大孔、交联网络结构和高气孔率特征的碳模板进行有效硅化可制备出高质量的SiC陶瓷支架。陶瓷增强体中高含量自由Si和金属基体中SiC的石墨化与活性元素(如Fe和Cr)的存在导致了强烈的界面反应,结果引起SiC陶瓷支架的严重分解。与金属基体材料的耐磨性能相比,由于SiC陶瓷支架的添加,该复合材料的耐磨性能得到明显提高。     

SiC增强镁基复合材料的研究与应用

综述了Si C增强镁基复合材料的研究概况,介绍了微米级Si C、纳米级Si C、Si C晶须增强镁基复合材料的制备及性能,研究了采用搅拌铸造法、粉末冶金法、挤压铸造法和喷射沉积法制备Si C增强复合材料的性能,介绍了Si C增强镁基复合材料在军事上和汽车工业上及作为功能材料的应用,并结合镁基复合材料研究的现状对其未来发展趋势进行了展望。     

碳纳米管增强Cu和Al基复合材料的研究进展

碳纳米管(CNTs)增强Cu基或Al基复合材料是未来铜材或铝材方面最具潜力的发展方向之一。在本研究中,综述了近几年在CNTs增强Cu基和Al基复合材料研究方面取得的进展,论述CNTs的预处理、CNTs-金属复合粉末的制备、CNTs-金属复合块体材料的制备、界面结合机制以及CNTs的强化机理5个主要方面。     

石墨烯金属基复合材研究进展

本文详细叙述了石墨烯及其衍生物等增强相的应用范畴及适用区别以及比较了金属基复合材料的不同制备方法,分析传统的制备方法之间的分类特点及应用方向,重点提出了工艺步骤灵活、可控性极高的新型制备石墨烯增强金属基复合材料的方法—激光增材制造技术。深入讨论了石墨烯及其衍生物作为增强相,给金属基复合材料中带来的力学、摩擦学、电学、金属耐腐蚀等性能方面的改变,比较了石墨烯及衍生物作为增强相对铝、镁、镍、铜、钛等金属基复合材料性能提高及改善程度和在不同金属基复合材料中仍存在的增强相各种团聚、分散问题与金属基体的界面结合等及目前提出的处理方案,最后提出制备石墨烯金属基复合材料未来发展方向及新型制备技术仍存在的实际问题。     

纤维增强金属基复合材料耐磨机制的研究

根据纤维增强金属基复合材料的结构特点，研究了界面在复合材料磨损过程中的作用，磨损时，复合材料的界面可消耗纹扩展能量，阻滞裂纹扩展，氧化铝短纤维增强硅合金合材料具有优异的耐磨性；基体中的合金元素有利于形成良好的界面，改善复合材料的耐磨性。     

Microstructure evolution of rare earth Pr modified alumina-silicate short fiber-reinforced Al-Si metal matrix composites

Al-Si metal matrix composites (MMCs) reinforced with 20 vol.% alumina-silicate shot fibers (Al2O3-SiO2(sf)) were fabricated by an infiltration squeeze method. Pure Pr metal was added into these composites. The effect of Pr addition on the microstructure evolution of Al-Si MMCs was investigated by SEM,TEM,and EDS. Pr addition is favorable to make uniform microstructures with the modified eutectic Si crystal. PrAlSi phase with high contents of Pr and Si is observed on the interface between the fiber and the m...     

颗粒增强金属基复合材料的研究进展

概述颗粒增强金属基复合材料的成型工艺,介绍各种工艺的制备过程、在制备技术中存在的主要问题及解决措施,列举典型制备工艺的优点及应用范围,介绍国内相关的研究成果和应用状况,并对其今后发展的方向进行了探讨。颗粒增强金属基复合材料具有成本低、高强度、高模量、高耐磨性、易于制造等优点。指出颗粒增强钢铁基复合材料是当前研究的重要方向之一,颗粒增强钢铁基复合材料具有广阔的应用前景。     

浸渗法制备ZTA陶瓷/铁基复合材料研究进展

浸渗法制备ZTA陶瓷颗粒增强铁基复合材料的研究取得了很大进展。针对陶瓷预制体制备,铁水对陶瓷预制体的浸渗,陶瓷与铁水的润湿性,复合材料界面结合,复合材料耐磨性等方面的研究进行了论述。解决铁水对预制体的润湿性是实现浸渗的先决条件,常用的方法有在陶瓷预制体中添加活性元素,通过化学镀、气相沉积以及包覆等方法对陶瓷表面进行改性等;在陶瓷与金属基体间形成过渡层可以改善结合界面的组织结构,促进陶瓷与金属基体形成冶金结合;铁水对陶瓷预制体的浸渗机理,以及ZTA陶瓷复合材料的耐磨机理尚需要深入研究。     

Thermal spraying of billets and fiber prepregs for semi-solid forming of metal matrix composites

The use of thermal spray processes with subsequent material densification by semi-solid forming can yield advantages for manufacturing of metal matrix composites (MMC) compared to well-established manufacturing methods like spray forming or diffusion bonding. The main challenges of this method lie in well defined process temperatures during material deposition and forming, handling of the material during the processes, microstructure of the semi-finished matrix, and economical efficiency of the process chain.Particulate reinforcement of light metal matrix material is mainly aimed on improvement of mechanical properties at elevated temperatures, e.g. wear behavior, creep resistance, yield and tensile strength. Composite formation for particle reinforced metals (PRM) by thermal spraying with the arc wire system is achieved by simultaneous deposition of matrix and reinforcement by means of cored wires. Unidirectional (UD) fiber reinforced MMC yield highest specific mechanical properties and can be processed by winding of a continuous fiber strand and coating of the fiber layer by arc wire spraying with wires from light alloy matrix material or by plasma spraying with mixed powders. The coating process can be simultaneous to the winding process or in a separate step for prepreg manufacturing with shape and fiber content adapted to the final component geometry and load case.     

Influence of corrosion on the interface between zinc phosphate steel fiber and cement

The interface bond between steel fibers and concrete matrix is a key factor influencing bearing capacity of steel fiber reinforced concrete (SFRC). In order to improve the interface bond strength and corrosion resistance, a kind of method was put forward by depositing zinc phosphate (ZnPh) coating on steel fiber surface in this paper. The corrosion behavior was investigated in 5% NaCl solution by using linear polarization measurement. Microstructure analysis (SEM and EDX) and fiber pull‐out test in combination with linear polarization measurement were carried out. The results prove that ZnPh coatings fabricated on the carbon steel surface can not only protect steel fiber against corrosion, but also enhance the mechanical interlocking bonds between fibers and matrix.     

应用模压铸造法制造的Al2O3f/SiCp混杂增强铝基复合材料的摩擦磨损行为（英文）

研究了通过模压铸造方法制造的氧化铝纤维与碳化硅颗粒混合增强铝基复合材料的干摩擦磨损性能。分别在室温、110℃,以及150℃条件下,进行了恒速0.36m/s(570r/min)的销盘式摩擦磨损实验。采用扫描电子显微镜观察干磨损表面特征,采用Arrhenius作图法研究相对磨损率,以便于进一步研究磨损机制。此外,讨论了纤维的方向性和纤维与颗粒的混合比作用。     

Forming of tubes and bars of alumina/LY12 composites by liquid extrusion process

1　INTRODUCTIONDuetotheincreaseduseofdiscontinuousrein forcementreinforcedmetalmatrixcomposites ,theirfabricationtechniqueshavebeensubjectedtoacontin uousdevelopmentduringthelastfewyears[14 ] .Avarietyofmethodsforproducingthiskindofcompos itehasbeenavailable .Amongthem ,fabricationusingpowdermetallurgyorliquidmetalforgingmethodhasa potentialadvantagetoachievefirst rank proper ties[5,6 ] .Buttube ,barandshapedproductscan tbeformeddirectlybythetwotechnologiesandthesec ondprocesssuchassqueez…     

Mixed regulation model of ceramic particles with molten high-chromium iron KmTBCr26

Particle reinforced metal matrix composites have many problems such as complicated preparation process, high production costs, weak interface bonding between the ceramic and metal matrix, uneven distribution of ceramic particles and so on. To solve these problems, the method of "shoot mixing + pressure compositing"(SM-PC) and a mixed regulation model of ceramic particles with molten steel were proposed. In the shoot mixing process, the special designed die casting equipment was used to make the particles with the molten metal mixed in the runner at a certain ejection speed(150 mm·s~(-1)). After the mixture is filled with the mold, the pressure is maintained until the end of solidification. In order to optimize this method to obtain the more uniform particle distribution, the parameters(ejection speed, preheating temperature of particles, the shape and size of runner) in the model were selected for sample preparation. Taking the distribution index of particles as the evaluation criterion, it is concluded that the uniform distribution of particles can be promoted with the increase of ejection velocity, the increase of particle preheating temperature, and the small change of gate size. When the preheating temperature of particles was 1,100 °C, and the shape of the runner was trumpet, the optimal particle distribution composite parts was obtained. Meanwhile, the particles and the matrix achieved strong interface bonding-"Class I interface " under the pressure compositing, even though they're non-wetting.