共查询到18条相似文献,搜索用时 125 毫秒
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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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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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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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本文介绍一种α-苯偶姻肟修饰的石墨压形电极及其在阳极溶出伏安法测铜中的应用.报道了该电极的制作方法及其电化学特性,讨论了电极组成对其性能的影响,优选了阳极溶出伏安法测定铜的条件,结果表明,该电极具有制备工艺简单,成本低廉,重现性好,选择性好等优点、 相似文献
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本文采用流变工艺方法加入石墨柱子制备铜-石墨复合材料,并对其组织和性能进行了研究。试验结果表明:铜-石墨复合材料具有较低的摩擦系数,是一种良好的自润滑、减震材料。 相似文献
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轴承钢GCr15广泛用于轴承、精密模具、量具等精密领域,电火花加工是所述精密领域中常用的加工方式。在电火花加工中,电极材料与电火花加工性能密切相关,选择合适的电极材料能够进一步发挥电火花加工的优势。选取三种电极材料进行对比研究,包括紫铜、石墨和铜钨合金WCu50,首先,从放电过程和热蚀除角度分析电极材料特性对于加工效率(MRR)、表面粗糙度(SR)和电极损耗率(TWR)的影响。其次,设计16组田口实验,得到不同电极材料的电火花加工轴承钢GCr15的MRR、SR和TWR。随后,提出一种石墨和铜钨合金WCu50组合电极分别作为粗加工和精加工的电极材料,验证性实验结果表明,本次提出的组合电极,相比于粗精加工均采用紫铜作为电极,加工效率提高50%,表面粗糙度降低32.4%,圆柱度提高42.4%。 相似文献
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考察了添加少量纳米SiCp对铜基材料电学和摩擦学性能的影响。结果表明:添加少量纳米SiCp(体积分数为0.5%),轻微降低了铜基材料的导电率,显著提高了耐磨性,有效降低了铜/钢摩擦副之间的粘着作用和材料转移;130nm SiCp/Cu基复合材料的导电性和耐磨性都优于30nm SiCp/Cu基复合材料。 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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This article presents a study of the erosion resistance of coated and uncoated polymer matrix composites for tidal turbine conditions. It focuses on the development of comparative erosive wear mode and mechanism maps for such materials. In our earlier work, testing of glass-fiber-reinforced polymer composites for tribological applications in marine simulated conditions, several erosion-related issues were highlighted. The combined effects of the NaCl solution and sand dramatically enhanced the erosive wear of the uncoated specimens. In order to address those issues, an erosion-resistant polymeric coating was applied to the composite and tested in marine simulated conditions with an extended range of sand particle size. The test results of the uncoated and coated composite have been compared in this research by erosive wear mode and mechanism maps techniques. These maps reveal that the coating has enhanced the erosion resistance. These findings provide significant progress toward materials selection approaches to manufacture of tidal turbine blades. 相似文献
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M.M. Stack 《Tribology International》1997,30(6):435-444
In studies of elevated temperature erosion, the performance of various materials has been investigated in a wide range of exposure conditions. Material performance has been shown to be dependent on erosion-corrosion conditions, determined by properties of the impacting particle, the temperature and the composition of the gaseous environment. Changes of the ranking order of wastage rates of various materials, as a function of the process conditions, is a common feature of the results to date. Such observations can make materials selection decisions, for elevated temperature erosion resistance, a fairly arbitrary exercise.In recent years, there has been significant interest in mapping the erosion of materials at elevated temperatures. Such maps demonstrate the transitions between the erosion regimes as a function of the main process parameters. More recently, for erosion of composite materials, they have also been used to identify the magnitude of the wastage rate.The object of this work has been to develop a simple rationale for construction of materials performance maps for exposure of materials to elevated temperature erosion conditions. The results used to construct the maps have been generated from literature on the performance of materials in laboratory simulated fluidized bed conditions. It is shown how ‘materials selection’ maps can be constructed for elevated temperature erosion resistance based on this approach. 相似文献
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Today the use of high-strength carbon fiber-reinforced plastics (CFRP) composite as a material for many engineering applications is showing an increasing demand in the industry. These composites are replacing the traditional use of steel because they offer many advantages such as very light weight, high strength, and high stiffness associated with good corrosion-resistant properties. Unfortunately, there is little technological knowledge on the electrical discharge machining (EDM) process of high-strength composite materials, especially about the CFRP. In this work, a study has made into the possibility of using EDM process as a means of machining CFRP composite. Various cutting conditions such as peak current, pulse-on time, pulse-off time and open-circuit voltage were selected to perform electrical discharge machining. The effect of electrode rotation was also studied. Optimum cutting conditions and machine settings for EDM were chosen for machining CFRP composites. 相似文献