陶瓷颗粒增强铁基复合材料制备技术综述

介绍了常用的陶瓷增强颗粒及其物理、力学性能,重点综述了陶瓷颗粒增强铁基复合材料典型制备技术的优缺点及应用现状。针对陶瓷颗粒增强铁基复合材料错综复杂的影响因素,指出将现有制备技术与计算机模拟技术相结合是今后陶瓷颗粒增强铁基复合材料制备技术的一个重要发展方向。     

粉末冶金颗粒增强钛基复合材料研究进展

颗粒增强钛基复合材料具有优异的力学性能，粉末冶金技术在制备颗粒增强钛基复合材料上有很大优势。本文从钛合金基材、颗粒增强相选择及制备工艺与性能等方面综述了粉末冶金颗粒增强钛基复合材料的研究进展，指出提高密度、降低成本是粉末冶金颗粒增强钛基复合材料的发展方向。     

颗粒增强钛基复合材料的研究进展

系统地介绍了颗粒增强钛基复合材料的最新研究进展和发展趋势,重点论述了该类复合材料组分的选择与改善匹配性的措施,并对颗粒增强钛基复合材料的制备技术和力学性能进行了评述。     

粉末冶金原位合成法制备钛基复合材料的研究进展

本文从制备钛基复合材料所需的基体和增强体的选材出发,阐述了粉末冶金方法在颗粒增强钛基复合材料中的研究与应用,并就未来粉末冶金技术在颗粒增强钛基复合材料中的研究方向阐明了观点。     

粉末冶金法制备颗粒增强钛基复合材料的研究进展

颗粒增强钛基复合材料因具有高强度、轻量化、耐蚀性和高温力学性能优良等特点被广泛应用于航空航天、汽车工业、医用工程领域。本文介绍了钛基复合材料在国内外的发展概况与研究成果,阐述了钛基复合材料基体组成、增强体形貌及物理性质、增强体引入方式、制备工艺及力学性能等方面,重点讨论了利用不同粉末冶金法制备颗粒增强钛基复合材料的工艺特点及材料特性,并对其进一步研究提出展望。     

金属基陶瓷颗粒增强复合材料的制备方法

介绍了金属基陶瓷颗粒增强复合材料(metal matrix ceramic reinforced cornposites)的基体与陶瓷增强相的选择,同时指出如何有效地改善金属基体与陶瓷颗粒增强相之间的浸湿性问题.总结了烧结前期复合坯体的一些主要制备方法.又介绍了金属基陶瓷复合材料(MMC)的烧结工艺,重点介绍了通电烧结,比较了各新工艺的基本原理和优缺点,最后对金属基陶瓷颗粒增强复合材料进行了技术展望.     

一种原位自生钛镍合金骨架增强钛基复合材料的制备方法

本发明公开了一种原位自生钛镍合金骨架增强钛基复合材料的制备方法,具体工艺如下:(1)将球形钛粉酸洗、清洗后干燥;(2)将镍粉加入到去离子水中清洗后干燥;(3)将经干燥后的球形钛粉与经干燥后的镍粉球磨混匀,得到镍颗粒包覆钛粉;(4)将镍颗粒包覆钛粉进行热压烧结,经冷却后得到原位自生钛镍合金骨架增强钛基复合材料。采用球磨工艺制备镍颗粒包覆钛粉,然后经热压烧结使镍颗粒与钛基粉末发生固溶反应,通过控制热压烧结的升温速率和保温时间控制镍元素向钛基体内部的扩散速率,从而调节钛镍合金的生长尺寸,并在钛合金基体内部形成纳米棒状的钛镍合金骨架,起到强化作用,最终提高钛基复合材料的力学性能。     

Ti的新家族——钛基复合材料的发展与前景

本文概述了国内外钛基复合材料(TMCS)的研究开发及应用状况,介绍了颗粒增强TMCS和连续纤维增强TMCS的性能、特点及各种制备工艺,讨论了TMCS的发展方向。     

不连续增强钛基复合材料的研究进展

不连续增强相能有效改善钛基体的力学性能，提高钛基体的耐磨性、高温强度和抗氧化性，拓宽了钛合金的应用领域。陶瓷增强相具有硬度高、耐磨性好、热稳定、成本低廉等优点，成为不连续增强钛基复合材料的首选增强相，其中使用最为广泛的是TiC颗粒和TiB纤维。纳米碳材料因具有高弹性模量以及高抗拉强度等优异性能，可有效改善复合材料的强度、塑性，被用来制备高比强度的钛基复合材料，近年来成为最具潜力增强体材料。本文从增强体材料的选择出发，归纳总结了近十年不连续增强钛基复合材料的研究进展，综述了不同增强体材料对钛基体组织与力学性能的影响以及强化机理，提出进一步的研究方向，为提高钛基复合材料的整体性能和扩大其应用范围提供一定的依据。     

高温钛合金及钛基复合材料增材制造技术研究现状

高温钛合金及钛基复合材料因具有比强度高、比刚度高、耐腐蚀、耐高温等优异性能，近几年来受到了广泛的关注。钛基复合材料的力学性能往往与增强相组织有关，增材制造技术的快速凝固可以使颗粒增强钛基复合材料中晶粒细化，力学性能得到提升。本文综述了高温钛合金及钛基复合材料的研究进展，分析了增强相组织对材料力学性能的影响，总结了增材制造技术制备钛基梯度功能材料的应用。通过增材制造技术制备钛基复合材料不仅可以提高复合材料的硬度和强度，还可以提高复合材料的延展性，采用增材制造技术制备高性能钛基复合材料将会成为未来的发展趋势。     

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.     

高温钛合金和颗粒增强钛基复合材料的研究和发展

简要回顾了高温钛合金的研究和发展历程,指出现代高温钛合金进一步发展需要解决的主要难题.综述了颗粒增强钛基复合材料的研究现状,从基体的选择、增强相的选择和制备工艺等3个方面,较详细地阐述了颗粒增强钛基复合材料设计中的基本任务.最后对今后的发展趋势进行了展望.     

多元多尺度增强钛基复合材料复合设计与先进加工技术研究进展

多元多尺度钛基复合材料以其轻质、高强、耐热等优异的性能在航空航天等高新技术领域具有广阔的应用前景。从多元多尺度强化设计思路、先进加工技术、工程应用等方面综述了原位自生钛基复合材料的研究现状。指出了研究中的关键突破点与存在的问题,并提出了新的研究方向,进一步优化复合材料多元多尺度设计体系,挖掘材料内部结构设计,提高材料的综合性能;另一方面完善先进热加工技术与理论,改善钛基复合材料的加工性,推动轻质高强钛基复合材料在重大装备等领域的应用。     

TiC晶须的制备及应用

TiC晶须以其优异的物理和化学性能具有重要的研究意义和实用价值.该文综述了国内外TiC晶须的最新研究进展,详细介绍了几种制备TiC晶须的典型方法,如碳热还原法、化学气相沉积法、原位合成法、溶胶-凝胶法等,并指出了这几种制备方法的优缺点,分析、讨论了TiC晶须的2种生长模型及机理;介绍了TiC晶须作为增强增韧相在陶瓷基复合材料、金属基复合材料中的具体应用情况,展望了TiC晶须的发展前景.     

Effects of Reinforcements on Creep Resistance of Hybrid-Reinforced Titanium Matrix Composites

Hybrid-reinforced titanium matrix composites (TMCs) were in-situ synthesized by common casting and hot-working technologies. High-temperature creep behavior of the matrix titanium alloy and composites was tested at 873, 923, and 973 K in the stress range from 20 to 300 MPa. Depending on the stress levels, creep behavior of the matrix alloy and composites was divided into two stress regions. Creep resistance of the composites was significantly enhanced by the reinforcements. Threshold stresses and stress transfer effects were introduced to explain the enhancement of creep resistance. In most cases, high volume fractions of reinforcements caused a deleterious effect on the creep resistance of composites. On the other hand, types and morphologies of reinforcements were the dominant factor contributing to the enhancement of creep resistance.     

The bioactivity of titanium-cuttlefish bone-derived hydroxyapatite composites sintered at low temperature

ABSTRACT

The most limiting features of titanium as a bone substituent are lack of bioactivity and high Young’s modulus. We have prepared titanium-hydroxyapatite (Ti-HAp) composites using titanium hydride as sintering agent to provide titanium sintering at lower temperature and preserve the stability of apatite phase. After low temperature sintering, no hydroxyapatite decomposition was detected. Pure titanium samples sintered in the presence of hydride showed smooth surface indicating good densification at 800°C. Higher HAp content resulted in decreased density and higher porosity due to the formation of micro- and macro-pores caused by the integration of HAp particles into titanium matrix and titanium hydride decomposition. However, Vickers microhardness test showed increased hardness for Ti-HAp composite with 10% of HAp regarding pure Ti. The bioactivity of Ti-HAp composites evaluated in simulated body fluid significantly improved with HAp content. The presence of HAp has lowered the cytotoxic effect of Ti-based composites on Hek293 cells.     

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.     

Reaction Kinetics at the Fiber/Matrix Interface of SiC<Subscript>f</Subscript>/Ti–15–3 Composites

In the current research work, spark plasma consolidated beta-titanium alloy Ti–15V–3Cr–3Al–3Sn composites reinforced with SiC fibers (Sigma SM1240) were subjected to high temperatures (1173, 1223 and 1273 K) for different time periods (2.7, 11, 25 and 44 h) to investigate the kinetics of the chemical reactions at the fiber/matrix interface. Through microstructural studies and room temperature tensile tests, we have attempted to study the effect of the formed brittle reaction zone on the final mechanical properties of the composite. We have observed that, prior to the SiC fiber, the protective carbon coating reacts with the matrix and results in the formation of a reaction zone (predominantly TiC) at the fiber/matrix interface. The reaction zone propagates into the matrix with increase in time at the expense of the carbon coating, and finally ends with the onset of titanium silicide reaction. The reaction kinetics at the fiber/matrix interface was predominantly controlled by diffusion of carbon through the reaction zone and the activation energy for the same was calculated to be 149 kJ/mol. It was clear from the tensile test results that the mechanical properties of the composites do not earnestly decrease until the commencement of titanium silicide reaction.