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电铸工艺对工具电极材料抗电蚀性能的影响研究 总被引:6,自引:0,他引:6
提升基于准LIGA工艺制作的微细电火花加工工具电极材料的耐电蚀能力,是准LIGAMicroEDM组合加工高深宽比三维微结构可靠实现的重要研究内容。论述了该组合加工的技术优势及其工艺路线,理论分析了电铸电极材料电蚀性的影响因素,试验研究了电沉积工艺参数和操作条件如添加剂种类及其添加量、电流密度、温度等对电铸铜工具电极电蚀能力的影响。结果表明,组合添加适量明胶和Cl-,在适当的电流密度和温度等工作条件下,电铸出的铜工具电极在微细电火花加工中表现出超强的耐电蚀能力,重量相对损耗为0.3%。 相似文献
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参照GB/T6553-2003标准的试验方法,试验研究了在直流电压下,电极极性、电极材料、污液流量、电压值和污液电阻率等因素对硅橡胶材料耐电痕化和电蚀损性能试验结果的影响,并对参照GB/T6553—2003标准进行直流耐漏电起痕试验提出了建议。 相似文献
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以降低高温镍基合金涡轮叶片冷却孔电火花加工电极损耗率为目标,基于精密电铸工艺,优化了铸液工艺参数,在添加纳米La2O3条件下制备了铜管电极的铜电铸层,并将其与未添加La2O3所制备的铜电铸层进行了材料性能对比分析。以Inconel 718镍基合金叶片冷却孔为加工对象,利用所制备的带有纯铜电铸层的管电极进行了抗电蚀性能对比研究。试验结果表明:铸液中La2O3的添加量为1.2g/L时,铜电铸层晶粒最细,晶粒平均直径为15.9μm,表面粗糙度降至0.140μm,显微硬度可达98.2HV;用其制成的铜管电极损耗率较普通紫铜管电极和未添加纳米La2O3的铜管电极损耗率分别降低了13.29%和7.26%。 相似文献
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以土状石墨粉和铜粉为原料,采用粉末冶金法制备了铜/石墨材料,然后采用冲击波合成工艺制备了多晶金刚石微粉;研究了铜含量、石墨粒径、热处理以及复压工艺对其得率和耐磨性的影响。结果表明:多晶金刚石微粉的得率随铜含量的增加而增大,随石墨粒径的增大而先增后降,粒径为70μm时的得率最高;复压前,多晶金刚石微粉的得率随热处理温度的升高先略增加后又急剧降低,复压后,得率随热处理温度的升高而增大;制备工艺对多晶金刚石微粉耐磨性能的影响较小。 相似文献
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将不同体积百分数的碳纤维和石墨一起以适当工世复合制得了碳纤维/石墨复合电刷材料,并对所得复合材料的理化性能和电接触性能进行了测试分析,从而探讨碳纤维用于制造复合电刷材料的可能性。 相似文献
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制作一种电火花小孔加工用Cu-Ni复合电极,其原理是基于电镀层和基体材料性能的差异,改变电极材料电蚀性能,保证电极端面和侧面的均匀损耗。在D703F型高速电火花小孔加工机床上,用Cu-Ni电极加工1Cr18Ni9Ti不锈钢材料,与常用的普通铜管电极对比。结果表明:在相同的加工条件下,Cu-Ni复合电极的电极损耗明显降低,同时改善了因电极损耗引起的被加工工件的尺寸精度和形状精度。 相似文献
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In this article, the wear behavior of metal-impregnated carbon materials (MIC) and carbon–carbon composites(C-C) was investigated using a self-made current-carrying wear tester producing an electrical current of 40–160 A and a contact speed of 10–50 m/s. The worn surfaces were observed by means of scanning electron microscopy (SEM), and a new parameter for current-carrying stability that describes the stability of the current as a function of wear was proposed. The results indicate that the wear rate of both materials tested increased with either an increase in electrical current or contact sliding speed. Compared to the metal-impregnated carbon material, the C-C composite material not only displayed superior wear resistance but superior current-carrying stability as well. With increasing electrical current, the current-carrying stability of the two materials changed within a narrow range at a speed of 20 m/s and decreased at a speed of 50 m/s. Wear failure was mainly due to electrical erosion occurring at high speed and high current. 相似文献
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本文分别研究了微米TiC和微米TiN对陶瓷刀具材料Al2O3-3Y-ZrO2微观结构和力学性能的影响。结果表明,添加微米TiC后,陶瓷刀具材料的断裂韧度略有下降。添加微米TiN的陶瓷刀具材料A5Nm20Z在烧结温度为1650℃、烧结压力为30MPa和保温时间为30min时的力学性能最好,抗弯强度、断裂韧度和维氏硬度分别为845.14MPa、4.87MPa·m1/2和16.40GPa。 相似文献
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The cavitation erosion resistance of P/M aluminum alloy-sintered composite with AlN dispersoids, prepared via the in situ synthesis and the conventional premixing process, was evaluated by using magnetostrictive-vibration type equipment. In situ synthesized AlN particles were effective for the improvement of the erosion resistance of the composite because of their good bonding with the aluminum matrix. The additive AlN by the premixing process were easily detached from the specimen surface due to the insufficient coherence with the matrix, and caused the poor resistance. The cavitation resistance also depended on the porosity of the sintered composite. The continuously opened pores accelerated the wear phenomena by the cavitation due to the high-pressure attack on the primary particle boundaries of sintered materials in the collapse of the bubbles. 相似文献
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Al2O3 particles reinforced Cu–Cr–Zr alloy matrix composite was fabricated through a powder metallurgy plus hot extrusion process
by using the water atomization Cu–Cr–Zr powder as raw material. The effect of aging treatment on the tribological behavior
of the composite was investigated. Experimental results show that tiny coherent precipitated phases were formed in the matrix
after proper aging treatment and therefore good combination properties could be obtained. The wear rates of the Al2O3/CuCrZr composite and its matrix alloy were obviously influenced by the aging treatment, wherein the best wear resistance
was reached at the aging temperature corresponding to the highest Vickers hardness. The major reason was that the depth of
plastic deformation in the subsurface region was dramatically decreased due to the improvement of mechanical properties of
the matrix, and therefore adhesion induced surface materials loss could be markedly alleviated. By comparing with the SiC20 vol%/Cu
composite, it is indicated that the Al2O3/CuCrZr composite exhibited much better wear resistance as well as higher electrical conductivity. 相似文献
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Kim Heejin Jeon Dae-Young Jang Se Gyu Lee Min Wook 《Journal of Mechanical Science and Technology》2022,36(6):3103-3107
Carbon nanotube (CNT) fillers in composite materials improve electrical conductivity, thermal stability, and mechanical properties. Boron nitride (BN) is an insulating material that is also thermally stable. Therefore, CNT and hexagonal boron nitride (hBN) fillers have been used to obtain composite materials’ high electrical conductivity. In this study, CNT-hBN/polyacrylonitrile (PAN) fibers were spun using simple wet-spinning and the effect of hBN on the electrical conductivity of the CNT-hBN/PAN composite was investigated. Contrary to predictions, as the content of the insulating material, BN, increased up to 15 wt%, the electrical resistance of the composite fiber decreased.
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