TiC/Cu复合材料的研究进展

本文介绍了陶瓷基TiC/Cu复合材料的研究进展,主要叙述了TiC/Cu复合材料的几种制备方法,并概括了TiC/Cu复合材料的基本性能。     

TiC/Fe复合材料的研究进展

介绍了陶瓷基TiC／Fe复合材料的研究进展，在概述TiC／Fe复合材料的几种制备方法的基础上，对材料的性能改进途径，材料的实际应用等进行了展望。     

非连续相混杂增强金属基复合材料的研究进展

论述了非连续增强金属基复合材料的研究概况,简要介绍了非连续相混杂增强金属基复合材料常用的几种制备方法,包括搅拌熔铸法、压力铸造法、无压浸渗法、喷射沉积法、粉末冶金法、原位反应法等,同时对常见的3种增强体的混杂类型:颗粒+颗粒、短纤维+晶须(短纤维)、颗粒+晶须(短纤维)增强金属基复合材料的性能和国内外研究现状进行了综述,指出了非连续相混杂增强金属基复合材料存在的问题,并对其今后的发展进行了展望。     

Ti-Ni-C形状记忆复合材料制备研究

采用几种不同工艺方法制备了Ti-Ni-C形状记忆复合材料，用扫描电镜和光学显微镜，对复合材料的微观组织进行了分析，并考察了材料的力学性能。结果表明，SHS合成与真空熔炼相结合能制备出TiC均匀分布．致密的Ti-Ni-C复合材料，TiC强化效果显著；然而，熔炼时间过长,TiC会聚集长大。组织粗化。复合材料的硬度下降。     

硫酸钙晶须制备及应用研究进展

硫酸钙晶须是由石膏矿或工业副产品脱硫石膏制备而得，它是一种形貌完整，长径比大，比表面积大，横截面均匀的亚纳米纤维材料，是一种性能良好的改性剂.但是由于当前制备的硫酸钙晶须产率低，质量差等问题，导致硫酸钙晶须在大范围应用上受到一定的限制.文中着重介绍了硫酸钙晶须的结构形貌特征与形成机理，详细阐述了国内外制备硫酸钙晶须的方法，介绍了常压酸化法、水热合成法、离子交换法、微乳液法等制备工艺的研究进展，分析了不同制备方法的优缺点；同时介绍了硫酸钙晶须在材料改性、环境保护等领域的应用.对深入研究硫酸钙晶须制备及作用机理具有的重要意义，为硫酸钙晶须未来应用以及矿产资源综合回收利用提供了科学性指导.      

用XD法制备的TiC／2618复合材料的微观结构分析和耐磨性初探

通过扫描电子显微镜和透射电子显微镜对XD法制备的TiC(6m%)/2618复合材料的显微结构进行了分析,并在此基础上进行了耐磨性探讨.结果表明:XD法制备的TiC(6m%)/2618复合材料中,TiC颗粒细小(约0.65μm<1μm),表面光洁且与基体结合良好.这对提高材料性能尤其是面磨性是极为有利的.     

不同碳源TiC/Ti复合材料的显微组织及力学性能

采用原位熔铸法制备了不同TiC添加量以及不同碳源(碳粉末、碳纤维和碳纳米管)的TiC/Ti复合材料,研究了TiC添加量和碳源种类对铸态和锻态TiC/Ti复合材料显微组织的影响,并对不同碳源制备的铸态和锻态复合材料进行了断裂韧性和室温压缩性能测试。结果发现,TiC/Ti复合材料主要由α-Ti和TiC组成;α片层宽度随着TiC体积分数的增加逐渐下降,TiC呈条状或片状。经过锻造,TiC呈近等轴状,α片层进一步细化。以碳粉末作为原位反应碳源制备的铸态TiC/Ti复合材料,断裂韧性较高,以碳纤维和碳纳米管作为碳源时,断裂韧性较低;以不同碳源制备的铸态复合材料,室温抗压强度和屈服强度无明显差异。     

专利名称:一种TiC颗粒增强Ti-Mo-Hf复合材料及制备方法

正专利申请号:CN201310441637.X公开号:CN103526074A申请日:2013.09.25公开日:2014.01.22申请人:中南大学本发明涉及一种TiC颗粒增强Ti-Mo-Hf复合材料及制备方法,属钛基复合材料制备技术领域。本发明所述复合材料由TiC颗粒和Ti-Mo-Hf基体合金组成,所述TiC颗粒占基体合金体积的3%~6%,所述TiC颗粒的粒度为3~5μm。本发明按设计的复合材料组分配比,分别取Mo_2C粉末、HfC     

原位反应合成法制备TiC/2618复合材料的工艺研究

利用原位反应合成法（即XD法）制备了不同成分配比的TiC/Al预制块,然后通过熔铸法制备了TiC/2618复合材料,并通过X—ray衍射技术和透射电镜分析方法对预制块和复合材料进行了研究,结果表明：（1）Al、Ti、C粉末的配比直接影响其烧结产物的组织成分及含量,当C%较高时,产物中除α（Al）和TiC相外还含有Al4C3相;烧结产物的致密度随Ti%的减少而增大,高含Ti%量的预制块因其低密度、不利于熔铸而不适于制作复合材料。（2）熔铸法制备TiC/2618复合材料是可行的。     

Mo对TiC/316L不锈钢复合材料组织和性能的影响

为了提高TiC/316L不锈钢复合材料的力学性能,在TiC/316L复合粉末中添加不同质量分数的Mo元素,采用粉末冶金法制备TiC/316L不锈钢复合材料.通过对复合材料的显微组织分析,拉伸、摩擦磨损等力学性能的测试,研究Mo含量对复合材料的组织和性能的影响.结果表明,Mo的添加有利于复合材料的组织均匀化,从而提高复合...     

熔盐辅助法制备碳化钛材料的研究进展

近年来,在熔盐辅助法制备TiC材料方面已取得一定研究成果,已采用熔盐辅助法制备出不同粒度、形貌各异及纯度不同的TiC粉体、TiC涂层和TiC纤维等。本文在归纳总结熔盐辅助碳热还原法、熔盐辅助电化学法、熔盐辅助金属热还原法、熔盐辅助直接碳化法以及熔盐辅助微波合成法制备TiC材料的工艺、原理、产物纯度、形貌及其优缺点等基础上,对未来在杂质去除、提高TiC纯度、调控TiC形貌等方面的研究进行了展望,期望为高质量TiC材料的制备提供技术参考。      

Reaction Synthesis of Titanium Matrix Composites Through Powder Metallurgy Processing Technique

Titanium matrix composites reinforced with 10, 20 and 30 vol.% of in situ TiB–TiC reinforcements were fabricated using powder metallurgy method which offers economical solution for production of high performance materials. The in situ composites were produced by reaction of sintering of uniformly blended and compacted powders of titanium and boron carbide in required proportions. XRD analysis confirmed the completion of in situ reaction. SEM studies confirmed uniform distribution and the shape of the reinforcement, TiB as whiskers and TiC as equiaxed particles. The effect of morphology and reinforcement volume on properties of the composites were evaluated by measurement of modulus, hardness, three-point bend test and compression test at ambient temperature along with unreinforced titanium. The study has revealed that the composites with increasing percentage of the reinforcements exhibited improved properties due to the presence of TiB whiskers distributed uniformly. Fractography of the three-point bend tested samples revealed the plastic mode of fracture for unreinforced titanium and the composites exhibiting mixed mode of fracture.     

Microstructural characterisation and mechanical properties of spark plasma-sintered TiB2-reinforced titanium matrix composite

Titanium and titanium matrix composites, reinforced with TiB₂ particles, have been synthesised by the spark plasma sintering method at 1050°C under 50?MPa pressure, using mixtures of 2.4?wt.-% TiB₂ and 97.6?wt.-% Ti powders. The changes in microstructural features and mechanical properties were investigated. XRD results and SEM observations confirm the formation of TiB whiskers as a result of the reaction between Ti and TiB₂. However, some unreacted TiB₂ particles have remained in the composite owing to the incomplete chemical reaction between matrix and additives. The measured mechanical properties demonstrate that the increase in hardness and tensile strength with TiB₂ addition is mainly attributed to the generation of TiB whiskers, increase in relative density and decrease in grain size, while the reduction in bending strength is possibly due to the plastic restraint imposed on the matrix by the TiB whiskers and unreacted TiB₂ particles.     

Effect of lithium on the mechanical properties and microstructure of sic whisker reinforced aluminum alloys

Aluminum-silicon carbide whisker composites containing nominally 3 to 5 pct Li in the matrix alloys have been fabricated and tested. Tensile and compression tests have been conducted at room temperature, and compression creep tests have been conducted at elevated temperatures. Lithium additions were found to increase the strengthening effect of silicon carbide whiskers at room and elevated temperatures. Lithium also reduced the density of the composites and increased the elastic modulus. Transmission electron microscopy showed no obvious chemical reaction between the whiskers and the aluminum-lithium alloy matrix.     

Matrix/reinforcement interactions in shock-wave consolidated titanium aluminide reinforced with SiC

Explosive shock-wave consolidation has been used to fabricate a composite consisting of gamma phase titanium aluminide matrix reinforced with paniculate silicon carbide. Although the consolidation process takes less than a microsecond to complete, melting of the surfaces of the titanium aluminide powder particles results in a reaction with the silicon carbide. Titanium suicide and titanium carbide form in the molten zone, depleting it of titanium to the extent that its final composition is TiAl₃. In addition, a second titanium suicide phase forms on the surfaces of the silicon carbide particles. This paper is based on a presentation made in the symposium “Interfaces and Surfaces of Titanium Materials” presented at the 1988 TMS/AIME fall meeting in Chicago, Illinois, September 25–29, 1988, under the auspices of the TMS Titanium Committee.     

Experimental approaches to simulating interfacial reactions in metal matrix composites

Samples of a titanium aluminide have been subjected to treatments designed to simulate their contact with the protective layer of a commercial silicon carbide fiber; such contact occurs during fabrication of actual metal matrix composites (MMCs). The first treatment consisted of immersion of the matrix material in a powder mixture, the composition of which corresponded to that of the protective layer of the fiber. The second method was the chemical vapor deposition (CVD) of such a layer. Subsequent isothermal exposure treatments showed that these methods produced interfacial reaction layers which very closely resembled the layers present in actual composites. It is concluded that approaches such as these are viable methods for evaluating the efficiency of potential coatings or surface modifications without the necessity of performing full-scale composite fabrication tests.     

原位自生钛基复合材料的研究进展

原位自生钛基复合材料以其高比强度和高比模量引起了人们的广泛关注,尤其是如何提高其高温性能成为近年来钛基复合材料研究的热点.该文详细综述了原位自生钛基复合材料的各种制备方法、增强体与钛基体的选择、各种增强体的反应体系以及原位自生钛基复合材料的组织结构与力学性能,指出了原位自生钛基复合材料今后的发展方向.     

钛/钢复合板及其制备应用研究现状与发展趋势

随着钛/钢复合板的应用领域不断拓展,市场对钛/钢复合板的尺寸和性能都提出了新的要求,现有的制备方法和工艺也面临着巨大挑战。本文从原材料情况、复合板尺寸、界面特征和力学性能等方面概述了钛/钢复合板研究现状,评述了钛/钢复合板目前的主要制备方法及其优缺点,综述了表面处理方法、热轧温度、过渡层金属和热处理工艺对钛/钢复合板界面结合质量的影响,阐述了钛/钢复合板的应用现状,指出了钛/钢复合板面临的主要问题及未来的重点研究方向。      

铜基复合材料制备及研究新进展

铜基复合材料具有出色的综合性能,是最受关注的金属基复合材料之一。尤其是随着高新科技领域对材料需求的日益增加,高性能铜基复合材料的研究与应用将更显重要。简要介绍了铜基复合材料的分类及常用的制备方法。同时,以颗粒、晶须及纤维等热门增强体为切入点,详细综述了国内外最新的研究进展。最后总结了铜基复合材料在界面结合、制备成本等方面所存在的问题,并展望了此类材料的发展方向。     

Fabrication of metal matrix composites of

Fine fibrous titanium carbide (TiC) was processed through the self-propagating high-temperature synthesis (SHS) method and employed to fabricate aluminum matrix composites. Two consol-idation methods were investigated: (1) combustion synthesis of TiC fiber/Al composites directly using titanium powders and carbon fibers ignited simultaneously with varying amounts of the matrix metal powder and (2) combustion synthesis of TiC using titanium powders and carbon fibers followed by consolidation into different amounts of the metal matrix powder, Al,via hot isostatic pressing (HIP). In the former method, when the amount of the Al in the matrix was increased, the maximum temperature obtained by the combustion reaction decreased and the propagation of the synthesis reactions became difficult to maintain. Preheating was required for the mixture of reactants with more than approximately 5 mole pct aluminum matrix powders in order to ignite and maintain the propagation rate. Microstructural analysis of the products from the Al/C/Ti reaction without preheating shows that small amounts of an aluminum carbide phase (AI4C3) are present. In the second method, following separation of the individual fibers in the TiC product, dense composites containing the SHS products were obtained by HIP of a mixture of the TiC fibers and Al powders. No ternary phase was formed during this procedure. Formerly Graduate Research Assistant, Department of Chemical Engineering, Michigan Technological University, is with Particle Technology, Inc., Hanover, MD 21076. This paper is based on a presentation made in the symposium “Reaction Synthesis of Materials” presented during the TMS Annual Meeting, New Orleans, LA, February 17–21, 1991, under the auspices of the TMS Powder Metallurgy Committee.