碳纳米管增强钛基复合材料的制备及性能研究
发布时间：2018-08-04 09:44
【摘要】：碳纳米管(CNTs)因其高强度、高模量、高韧性等优异的力学性能而被认为是最具潜力的增强体。近年来,以CNTs为增强体制备复合材料引起了广大科研工作者浓厚的兴趣,但是对CNTs-Ti基复合材料的研究尚处于初级阶段。研究表明,加入少量的CNTs可以有效地增强材料的强度。然而,CNTs与Ti在高温下极易发生反应生成TiC,虽然TiC也可以起到第二相强化的作用,但这势必会破坏CNTs的完整性,降低其力学性能、从而影响其增强效果。为了达到既抑制TiC的生成又获得高强度复合材料的目的,本次实验采用低温高压的烧结工艺制备CNTs-Ti复合材料。放电等离子烧结技术(SPS)是近年来发展起来的一种新型快速烧结技术,能够满足低温高压的烧结要求。本文采用SPS烧结技术制备CNTs-Ti基复合材料,研究了烧结温度及CNTs含量对复合材料相对密度、显微组织及力学性能的影响。本研究共设定了四个烧结温度点(400℃、450℃、500℃、550℃)和五种不同的成分(CNTs含量分别为0.2 wt%、0.4 wt%、0.6 wt%、0.8 wt%、1.0wt%)。所有实验其余烧结参数如下:初始压力1MPa、烧结压力为300MPa、保温时间为5min、升温速率为60K/min。研究结果表明:烧结温度为550℃,CNTs含量为1.0wt%的复合材料在烧结过程中并无TiC生成;复合材料的相对密度、显微硬度、抗拉强度及延伸率与动态屈服强度均随着烧结温度的升高而逐渐增大,在550℃时达到最大;CNTs含量对复合材料的相对密度无明显影响;复合材料的显微硬度、抗拉强度及动态屈服强度均随CNTs含量的增加呈现先增加后减小的变化趋势,当CNTs含量为0.4 wt%时,复合材料的抗拉强度及动态屈服强度均达到最大;复合材料的延伸率及晶粒尺寸则随着CNTs含量的增加而逐渐减小。当烧结温度为550℃,CNTs含量为0.4wt%时,复合材料具有最佳的综合力学性能,致密度为99.35%,抗拉强度为547MPa,延伸率为26%,硬度为2226MPa,动态流变应力为1033MPa,吸收功为417KJ/m3。这一成果为以后的CNTs-Ti基复合材料的研究奠定了一定的基础。
[Abstract]:Carbon nanotubes (CNTs) are considered the most potential enhancements for their excellent mechanical properties, such as high strength, high modulus, high toughness and so on. In recent years, the preparation of composite materials with CNTs has aroused great interest of the researchers, but the research on CNTs-Ti based composites is still in the primary stage. CNTs can effectively enhance the strength of the material. However, CNTs and Ti are easily reacted to produce TiC at high temperature. Although TiC can also play the role of second phase intensification, it will destroy the integrity of CNTs, reduce its mechanical properties, and affect its enhancement effect. In order to achieve the inhibition of the generation of TiC and the high strength composite material The purpose of this experiment is to prepare CNTs-Ti composites with low temperature and high pressure sintering process. Discharge plasma sintering (SPS) is a new rapid sintering technology developed in recent years. It can meet the requirements of sintering at low temperature and high pressure. This paper uses SPS sintering technology to prepare CNTs-Ti matrix composites, and studies the sintering temperature and CNTs. The effect of the content on the relative density, microstructure and mechanical properties of the composites. Four different sintering temperature points (400 C, 450, 500, 550) and five different components were set in this study (CNTs content was 0.2 wt%, 0.4 wt%, 0.6 wt%, 0.8 wt%, 1.0wt%). The other sintering parameters were as follows: initial pressure 1MPa, sintering pressure 300M Pa, the heat preservation time is 5min and the heating rate is 60K/min., the results show that the composite materials with sintering temperature of 550 C and CNTs content 1.0wt% have no TiC formation during the sintering process, and the relative density, microhardness, tensile strength and elongation and dynamic yield strength of the composite gradually increase with the increase of sintering temperature, at 550 degrees C. The content of CNTs has no obvious effect on the relative density of the composite. The microhardness, tensile strength and dynamic yield strength of the composite increase first and then decrease with the increase of CNTs content. When the content of CNTs is 0.4 wt%, the tensile strength and dynamic yield strength of the composite material are all maximum; the composite material is the most important. The elongation and grain size decrease gradually with the increase of CNTs content. When the sintering temperature is 550 C and CNTs content is 0.4wt%, the composite has the best comprehensive mechanical properties, the density is 99.35%, the tensile strength is 547MPa, the elongation is 26%, the hardness is 2226MPa, the dynamic rheological stress is 1033MPa, the absorption work is 417KJ/m3. this 10%. The results laid a foundation for the future research of CNTs-Ti matrix composites.
【学位授予单位】：北京理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB33
本文编号：2163464
[Abstract]:Carbon nanotubes (CNTs) are considered the most potential enhancements for their excellent mechanical properties, such as high strength, high modulus, high toughness and so on. In recent years, the preparation of composite materials with CNTs has aroused great interest of the researchers, but the research on CNTs-Ti based composites is still in the primary stage. CNTs can effectively enhance the strength of the material. However, CNTs and Ti are easily reacted to produce TiC at high temperature. Although TiC can also play the role of second phase intensification, it will destroy the integrity of CNTs, reduce its mechanical properties, and affect its enhancement effect. In order to achieve the inhibition of the generation of TiC and the high strength composite material The purpose of this experiment is to prepare CNTs-Ti composites with low temperature and high pressure sintering process. Discharge plasma sintering (SPS) is a new rapid sintering technology developed in recent years. It can meet the requirements of sintering at low temperature and high pressure. This paper uses SPS sintering technology to prepare CNTs-Ti matrix composites, and studies the sintering temperature and CNTs. The effect of the content on the relative density, microstructure and mechanical properties of the composites. Four different sintering temperature points (400 C, 450, 500, 550) and five different components were set in this study (CNTs content was 0.2 wt%, 0.4 wt%, 0.6 wt%, 0.8 wt%, 1.0wt%). The other sintering parameters were as follows: initial pressure 1MPa, sintering pressure 300M Pa, the heat preservation time is 5min and the heating rate is 60K/min., the results show that the composite materials with sintering temperature of 550 C and CNTs content 1.0wt% have no TiC formation during the sintering process, and the relative density, microhardness, tensile strength and elongation and dynamic yield strength of the composite gradually increase with the increase of sintering temperature, at 550 degrees C. The content of CNTs has no obvious effect on the relative density of the composite. The microhardness, tensile strength and dynamic yield strength of the composite increase first and then decrease with the increase of CNTs content. When the content of CNTs is 0.4 wt%, the tensile strength and dynamic yield strength of the composite material are all maximum; the composite material is the most important. The elongation and grain size decrease gradually with the increase of CNTs content. When the sintering temperature is 550 C and CNTs content is 0.4wt%, the composite has the best comprehensive mechanical properties, the density is 99.35%, the tensile strength is 547MPa, the elongation is 26%, the hardness is 2226MPa, the dynamic rheological stress is 1033MPa, the absorption work is 417KJ/m3. this 10%. The results laid a foundation for the future research of CNTs-Ti matrix composites.
【学位授予单位】：北京理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB33
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