【作者】 万喜伟；

【导师】 孙跃；

【作者基本信息】 哈尔滨工业大学 ， 材料学， 2007， 硕士

【摘要】 本文以1K聚丙烯腈纤维编制成的有纬平纹碳纤维织物作为增强体,利用化学镀的方法对纤维表面进行处理,通过等离子喷涂方法在增强体双侧表面喷涂厚度数十微米的Ni基合金,粉料为Al3%wt+Ni97%wt的微米级粒度混合粉,再经过热等静压、真空热压等致密化工艺制备出了纤维体积分数为25.7~32.8%的碳纤维增强镍基复合材料。为增加镍金属与碳纤维的浸润性,阻止二者发生反应,采用了化学镀对碳纤维进行表面防护处理,对化学镀的前处理工艺和镀液配方进行了系统研究,得到了低含磷量的致密镀层。采用扫描电镜(SEM)、X荧光光谱(XRF)、X射线光电子能谱(XPS)、X射线衍射(XRD)、差示扫描量热法(DSC)、能谱分析(EDS)等手段研究了碳纤维表面化学镀镍工艺和配方,并对制备出的碳纤维增强镍基复合材料的微观组织结构、相组成,高温拉伸性能进行了研究。并与未经表面镀镍的碳纤维增强镍基复合材料进行了对比分析。结果表明,增强体经表面处理所制备的复合材料的界面强度明显高于未经表面处理的复合材料。分析发现此材料具有明显的三个特点:1.在X射线衍射分析和能谱分析都发现材料中出现氧化铝相,致使材料呈现很大的脆性;2.热压工艺过程对复合材料中纤维强度损伤很大;3.材料的高温拉伸性能不理想,原因主要是热压工艺中的高温对碳纤维的损伤,基体材料的微孔型缺陷较多也是导致抗拉强度较低的重要因素。更多还原

【Abstract】 In this paper, latitudinal tabby carbon fiber cloth weaved by 1K acrylic fiber was used as reinforcement, whose surface was firstly modified by electroless nickel plating, then treated by plasma spray of Al3%wt+Ni97%wt micro powders on both sides with thickness of hundreds of microns. Subsequently, Hot Isostatic Pressing (HIP) and Vacuum Hot Pressing (VHP) were performed to densify the material and finally carbon fiber reinforced nickel base composite with 25.7～32.8vol.% fiber was prepared.Electroless plating was used to increase the infiltration and prevent the reaction between Ni and carbon fiber. Both the treatment before the electroless plating and the composition of the plating agent were investigated. And eventually we successfully got compact plating layer with low phosphorus.Scanning Electron Microscope (SEM), X-ray fluorescence analysis (XRF), X-ray Photoelectron Spectroscopy (XPS), X-ray diffraction, Differential Scanning Calorimetry(DSC), Energy Difusion Spectrum(EDS) and high-temperature stretcher were used to study morphology, microstructure, phase composition, and mechanical properties of carbon fiber reinforced Ni-base composites, so as to improve the technique and optimize the Composition of plating agent of electroless nickel plating on carbon fibers. We also prepared carbon fiber reinforced composite without plating layer for comparison.It was found that interfacial strength of composite with modified carbon fiber is much better than that of composite reinforced by untreated carbon fiber. Three characteristics in terms of the treated composite were revealed: a. Al2O3 phase was detected by XRD and EDS analysis, which brought brittleness to this material; b. the process of HP may seriously damage the carbon fibers inside the composite; c. The tensile strength at high temperature was not good, mainly due to the damage of carbon fiber caused by HP at high temperature, and also because there were many flaws such as micropores inside the matrix.更多还原