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旋转锻造加工高比重W-Ni-Fe合金的退火工艺研究
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作者 李天瑞 冯宏伟 +4 位作者 黄滢秋 刘晓彬 黄伟 周朝红 陈子明 《热加工工艺》 北大核心 2024年第6期62-66,71,共6页
使用粉末冶金工艺制备Ni/Fe为7∶3的W-Ni-Fe高比重钨合金,在使用旋转锻造方法进行形变强化后进行热处理。结果表明,锻造态W-Ni-Fe合金经过一定温度的锻后退火,强度有所提高,而塑性下降。样品的强度在一定的退火温度和保温时间范围内能... 使用粉末冶金工艺制备Ni/Fe为7∶3的W-Ni-Fe高比重钨合金,在使用旋转锻造方法进行形变强化后进行热处理。结果表明,锻造态W-Ni-Fe合金经过一定温度的锻后退火,强度有所提高,而塑性下降。样品的强度在一定的退火温度和保温时间范围内能得到提升,更高温度和更高时间的保温会使样品强度下降。不同钨含量的W-Ni-Fe合金,强度提升最大的退火温度和时间条件不同。SEM图像显示,退火前样品钨颗粒因旋转锻造变形呈现长条状织构,退火后钨颗粒的形状无明显变化。这些现象说明,锻造变形的合金样品经过锻后退火发生应变时效现象,使强度得到提升。研究明确了不同钨含量的W-Ni-Fe合金最佳的锻后退火工艺参数。 展开更多
关键词 高比重钨合金 w-ni-FE合金 旋转锻造 退火
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深冷轧制变形对新型Ni-W-Co-Ta高密度合金显微组织与性能的影响
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作者 舒康豪 熊毅 +5 位作者 厉勇 岳赟 陈正阁 查小琴 韩顺 王春旭 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2024年第4期1214-1225,共12页
采用熔炼-浇铸-锻造流程制备新型Ni-W-Co-Ta高强度合金,并对Ni-W-Co-Ta合金经深冷轧制变形后的显微组织及力学性能演变规律进行表征。结果表明:随着变形量的增加,新型Ni-W-Co-Ta高密度合金中等轴晶粒沿轧制方向不断被拉长,同时产生大量... 采用熔炼-浇铸-锻造流程制备新型Ni-W-Co-Ta高强度合金,并对Ni-W-Co-Ta合金经深冷轧制变形后的显微组织及力学性能演变规律进行表征。结果表明:随着变形量的增加,新型Ni-W-Co-Ta高密度合金中等轴晶粒沿轧制方向不断被拉长,同时产生大量的滑移带以协调剧烈的塑性变形,并最终形成纤维组织。变形量的增大导致位错密度急剧增大,位错交互作用显著加强,进而使晶粒尺寸细化至纳米量级;合金强度、硬度随着变形量的增加而显著提高,伸长率则急剧下降。断口形貌则由韧性断裂(未变形)向准解理-韧性混合型断裂转变(90%变形量)。 展开更多
关键词 ni-w-Co-Ta高密度合金 深冷轧制 纤维组织 力学性能 准解理-韧性混合型断裂
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元素添加对两步烧结W-6Ni-4Co合金组织和力学性能的影响
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作者 户晓南 董洪峰 李培友 《稀有金属与硬质合金》 CAS CSCD 北大核心 2024年第1期17-23,37,共8页
采用粉末冶金技术制备W-6Ni-4Co-2X(X=Nb、Ta、Hf、Mo、Ti)合金,研究添加Nb、Ta、Hf、Mo和Ti元素对W-6Ni-4Co合金组织和力学性能的影响。结果表明:W-6Ni-4Co-2X合金的显微组织主要由基体相(W相)和黏结相组成,且黏结相的种类和含量与烧... 采用粉末冶金技术制备W-6Ni-4Co-2X(X=Nb、Ta、Hf、Mo、Ti)合金,研究添加Nb、Ta、Hf、Mo和Ti元素对W-6Ni-4Co合金组织和力学性能的影响。结果表明:W-6Ni-4Co-2X合金的显微组织主要由基体相(W相)和黏结相组成,且黏结相的种类和含量与烧结过程W相在黏结相(Ni,Co)中的溶解析出有关。W-6Ni-4Co-2Ta、W-6Ni-4Co-2Hf合金组织W晶粒呈不规则多边形,W-6Ni-4Co-2Nb、W-6Ni-4Co-2Ti合金组织W晶粒呈椭球形,并分散分布在黏结相中。W-6Ni-4Co-2Ta合金组织均匀、晶粒细小、W/黏结相界面结合良好,使其硬度、抗弯强度和屈服强度较高。W-6Ni-4Co-2Mo合金组织W晶粒呈网状排列,连续W骨架结构与延性黏结相协同降低了合金的应变硬化程度,使其具有较好的抗应变硬化性能。因此,向W-6Ni-4Co合金中添加合适的过渡金属元素是提高其力学性能的一种有效途径。 展开更多
关键词 w-ni-Co合金 金属元素添加 两步烧结 微观组织 力学性能
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超音速微粒轰击时间对Ni-W-Co-Ta合金组织和性能的影响
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作者 杨苗苗 熊毅 +2 位作者 杜楠 汤金金 厉勇 《塑性工程学报》 CAS CSCD 北大核心 2024年第10期198-210,共13页
采用超音速微粒轰击(SFPB)技术对冷轧态Ni-W-Co-Ta合金进行表面纳米化处理,系统研究了恒定气体压力(1.0 MPa)条件下SFPB时间对冷轧态Ni-W-Co-Ta合金的表面完整性、微观组织及力学性能的影响。结果表明:SFPB处理后,新型Ni-W-Co-Ta合金表... 采用超音速微粒轰击(SFPB)技术对冷轧态Ni-W-Co-Ta合金进行表面纳米化处理,系统研究了恒定气体压力(1.0 MPa)条件下SFPB时间对冷轧态Ni-W-Co-Ta合金的表面完整性、微观组织及力学性能的影响。结果表明:SFPB处理后,新型Ni-W-Co-Ta合金表层形成一定厚度的梯度纳米结构,随着SFPB时间的延长,合金表面晶粒尺寸可细化至9.74 nm左右,相应的形变层深度、力学性能(强度、残余压应力、显微硬度)均呈现出增大趋势;当SFPB时间为120 s时,合金表面粗糙度最小的同时其力学性能指标达到峰值;SFPB时间继续增加至150 s后,合金表面出现数量众多的微裂纹,残余压应力松弛的同时相应的力学性能有所下降;SFPB处理前、后新型Ni-W-Co-Ta合金的伸长率无明显变化,断口形貌均呈现出典型的韧-脆混合型断裂特征。 展开更多
关键词 超音速微粒轰击 表面纳米化 ni-w-Co-Ta合金 微观组织 力学性能
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用于金刚石摩擦化学抛光的Ni-W合金盘制备
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作者 牛昊 金洙吉 +1 位作者 沈煜 杨辉鹏 《金刚石与磨料磨具工程》 CAS 北大核心 2024年第1期39-49,共11页
为探究镀液成分、工艺条件等因素对Ni-W合金镀层的影响,制备出低内应力、高硬度的Ni-W合金盘,用于金刚石的摩擦化学抛光。采用单一性实验分别探究络合剂浓度、溶液pH、糖精钠浓度对镀层内应力、钨含量、硬度以及沉积速率的影响,并探究... 为探究镀液成分、工艺条件等因素对Ni-W合金镀层的影响,制备出低内应力、高硬度的Ni-W合金盘,用于金刚石的摩擦化学抛光。采用单一性实验分别探究络合剂浓度、溶液pH、糖精钠浓度对镀层内应力、钨含量、硬度以及沉积速率的影响,并探究不同添加剂对镀层表面整平的效果。最终选用水杨醛为整平剂,并采用反向脉冲电流降低了镀层表面粗糙度,制备出硬度达HV 713,镀层厚度约为0.66 mm的Ni-W合金盘。使用合金盘对金刚石进行摩擦化学抛光,并探究合适的抛光工艺参数。在合金盘转速为8000 r/min,压力为40 N时,金刚石的抛光效果较好,其材料去除率为5.56μm/min,磨削比达0.394,金刚石表面粗糙度Sa为3.7 nm。使用传统铸铁盘对金刚石进行摩擦化学抛光,通过对比磨损参数发现,Ni-W合金盘能够达到更好的抛光效果。 展开更多
关键词 金刚石 ni-w合金 镀层内应力 摩擦化学抛光
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软装设计用铜合金的表面Ni-W-P镀层与性能研究
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作者 杨凱智 宗彦 吴克凡 《电镀与精饰》 CAS 北大核心 2024年第5期65-71,共7页
针对软装设计用铜合金复杂服役环境的使用需求,为解决铜合金表面硬度低、耐腐蚀性能差等问题,采用化学镀的方法在软装设计用铜合金表面制备了Ni-W-P镀层。研究了Na_(2)WO_(4)浓度对化学镀层沉积速率、表面形貌、物相组成、硬度和耐腐蚀... 针对软装设计用铜合金复杂服役环境的使用需求,为解决铜合金表面硬度低、耐腐蚀性能差等问题,采用化学镀的方法在软装设计用铜合金表面制备了Ni-W-P镀层。研究了Na_(2)WO_(4)浓度对化学镀层沉积速率、表面形貌、物相组成、硬度和耐腐蚀性能的影响。结果表明:随着Na_(2)WO_(4)浓度从15 g/L增加至65 g/L,铜合金表面镀层的沉积速率先增后减,在Na_(2)WO_(4)浓度为35 g/L时取得最大值。镀层中P元素含量逐渐减小,W元素含量先增加后减小。不同Na_(2)WO_(4)浓度的镀层中都可见Ni和Ni_(5)P_(4)衍射峰,镀层硬度高于未添加Na_(2)WO_(4)的镀层。且随着Na_(2)WO_(4)浓度增加,镀层硬度先增后减,在Na_(2)WO_(4)浓度为35 g/L时取得最大值。随着Na_(2)WO_(4)浓度从15 g/L上升至65 g/L,铜合金表面镀层的腐蚀电位先正向移动后负向移动,腐蚀电流密度先减小后增大。在Na_(2)WO_(4)浓度为35 g/L时,取得腐蚀电流密度最小值和电荷转移电阻最大值。电化学阻抗谱与极化曲线测试结果相吻合,Na_(2)WO_(4)浓度为35 g/L时具有最佳的耐腐蚀性能。 展开更多
关键词 铜合金 Na_(2)wO_(4)浓度 ni-w-P镀层 显微形貌 耐腐蚀性能
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钨含量对Ni-W合金镀层摩擦学性能的影响
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作者 高强 白霄 +2 位作者 牟毅 张德建 万勇 《润滑与密封》 CAS CSCD 北大核心 2024年第9期135-141,190,共8页
为探究W含量对Ni-W合金镀层摩擦学性能的影响,采用脉冲电沉积技术在45钢基体表面制备Ni-W合金镀层,探究钨含量对Ni-W合金镀层微观结构、力学及摩擦学性能的影响。研究结果显示:制备的Ni-W合金镀层晶粒尺寸均匀致密,镀层与基体之间结合紧... 为探究W含量对Ni-W合金镀层摩擦学性能的影响,采用脉冲电沉积技术在45钢基体表面制备Ni-W合金镀层,探究钨含量对Ni-W合金镀层微观结构、力学及摩擦学性能的影响。研究结果显示:制备的Ni-W合金镀层晶粒尺寸均匀致密,镀层与基体之间结合紧密;与基体材料相比,Ni-W合金镀层具有更高的硬度,且硬度随着钨含量增加而增加;45钢基体磨损行为主要表现为磨粒磨损,Ni-W镀层主要表现为黏着磨损和磨粒磨损,且随着W含量的增加,镀层的耐磨性能逐渐提高;在干摩擦和PAO6油润滑条件下,Ni-W合金镀层能够显著降低基体的磨损,尤其在油润滑条件下,镀层表面几乎没有出现磨损。因此,脉冲电沉积Ni-W合金镀层具备优异的摩擦学性能,通过调节镀层中的钨含量可有效改善其力学性能和摩擦学性能。 展开更多
关键词 脉冲电沉积 ni-w合金镀层 力学性能 摩擦学性能
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The study of electroless Ni-W-P alloy plating on glass fibers 被引量:8
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作者 HUANG Ying HUANG Fei ZHAO Wentao SHI Ke ZHAO Li WANG Yanli 《Rare Metals》 SCIE EI CAS CSCD 2007年第4期365-371,共7页
Ni-W-P coatings were deposited on the surface of glass fibers by the electroless plating process. The bath was very stable through the palladium salt test. There was no phenomenon of peeling and blistering on the surf... Ni-W-P coatings were deposited on the surface of glass fibers by the electroless plating process. The bath was very stable through the palladium salt test. There was no phenomenon of peeling and blistering on the surface of the Ni-W-P alloy glass fibers in the thermal shock test. It showed that the deposit had high impact strength and good adhesion. The morphology of the coatings was observed by scanning electron microscope (SEM). The elements and their contents were tested and analyzed by energy dispersion spectrometer (EDS). The tungsten content reached up to 12.1 wt.%. The effects of the concentrations of NiSO4, Na2WO4, and NaH2PO2.H20 on the conductivity of the coatings were studied. The resistivity of the Ni-W-P alloy glass fibers reached 7.39 × 10^-3 Ωcm. The alloy coatings on glass fibers were analyzed by XRD. The results indicated that the deposit had an amorphous structure and good heat stability. The suitable work temperature range was lower than 190℃. Finally, the electromagnetic parameters of the Ni-W-P alloy glass fibers were tested and analyzed primarily. The magnetic loss reached 0.04023 and the dielectric loss reached -5.80239. The plated alloy is a kind of soft magnetic material. 展开更多
关键词 ni-w-P alloy electroless plating RESISTIVITY electromagnetic parameters glass fiber
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Corrosion and wear properties of electroless Ni-P plating layer on AZ91D magnesium alloy 被引量:10
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作者 李忠厚 陈志勇 +2 位作者 刘沙沙 郑峰 戴阿赶 《中国有色金属学会会刊:英文版》 EI CSCD 2008年第4期819-824,共6页
A direct electroless Ni-P plating treatment was applied to AZ91D magnesium alloy for improving its corrosion resistance and wear resistance. Corrosion resistance of the Ni-P coatings was evaluated by potentiodynamic p... A direct electroless Ni-P plating treatment was applied to AZ91D magnesium alloy for improving its corrosion resistance and wear resistance. Corrosion resistance of the Ni-P coatings was evaluated by potentiodynamic polarization and immersing experiments in 3.5% NaCl solution. The wear resistance of the coatings was investigated by the wear track and the mass change after ball-on-disk experiment. The results show that corrosion resistance and wear resistance of the AZ91D alloy are greatly improved after direct electroless Ni-P plating. No discoloration is noticed until 4 d of immersion in 3.5% NaCl solution. Potentiodynamic polarization experiments show that the free corrosion potential of magnesium alloy is shifted from -1 500 mV to -250 mV and passivation occurs at 1 350 mV after direct electroless plating. The friction coefficients and wear rates of Ni-P coating and Ni-P coating after tempering are 0.10-0.351, 9.038×10-3 mm3/m and 0.13-0.177, 3.056×10-4 mm3/m, respectively, at a load of 1.5 N with dry sliding. Although minor hurt on corrosion resistance was caused, significant improvement of wear resistance was obtained after tempering treatment of the coating. 展开更多
关键词 AZ91D镁合金 镍-磷化学镀 耐腐蚀性 耐磨性
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Effects of Mm(NiCoAlMn)_5 hydrogen storage alloy coated with Ni-Co-P alloy by electroless plating on electrochemical properties of hydride electrodes
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作者 孙春文 郭占成 +1 位作者 唐致远 郭鹤桐 《中国有色金属学会会刊:英文版》 CSCD 2003年第4期938-942,共5页
The effect of chemical plating with Ni Co P alloy on the properties of MH electrodes is investigated. The results show that the efficiency of storage alloy and the activation of MH electrode have been improved by intr... The effect of chemical plating with Ni Co P alloy on the properties of MH electrodes is investigated. The results show that the efficiency of storage alloy and the activation of MH electrode have been improved by introducing 1.74% cobalt in the Ni Co P alloy coating. The initial discharge capacity is 208 mAh/g. The maximum discharge capacity gets to 298.5 mAh/g. At the same time the cycle life of MH electrodes is improved. The discharge capacity of MH electrodes coated with Ni Co P is 88% of the maximum discharge capacity after 300 cycles. Whereas the discharge capacity of bare alloy electrodes retains 62% of the maximum capacity after 300 cycles. An increment of discharge capacity is mainly due to the superposition of the oxidation current of Co as well as improved efficiency of microcurrent collection. The effect of Ni Co P alloy coating by electroless plating on the kinetic properties of hydride electrode has been systematically investigated by electrochemical techniques. The results indicate that the kinetic properties of MH electrodes, including exchange current density, limiting current density, have been improved markedly. This improvement of kinetic properties leads to the decrease of the overpotential of anodic and cathodic polarization. 展开更多
关键词 AB5型 储氢合金 稀土 镍氢电池 ni-Co-P合金 电化学性能 电镀
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Cr12MoV模具钢化学镀Ni-W-P/PTFE复合镀层及耐磨性能研究 被引量:1
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作者 崔凯 任伟和 《电镀与精饰》 CAS 北大核心 2023年第10期32-39,共8页
以Cr12MoV模具钢作为基体化学镀Ni-W-P/PTFE复合镀层,以期提高模具的耐磨性能。通过改变PTFE颗粒添加量获得不同Ni-W-P/PTFE复合镀层,并对复合镀层的表面形貌、化学成分、晶相结构、硬度及耐磨性能进行表征。结果表明:不同复合镀层表面... 以Cr12MoV模具钢作为基体化学镀Ni-W-P/PTFE复合镀层,以期提高模具的耐磨性能。通过改变PTFE颗粒添加量获得不同Ni-W-P/PTFE复合镀层,并对复合镀层的表面形貌、化学成分、晶相结构、硬度及耐磨性能进行表征。结果表明:不同复合镀层表面都存在尺寸不同、分布不均匀的胞状物,还附着白色PTFE颗粒,但是晶相结构无显著性差异。随着PTFE颗粒添加量从2 g/L增至14 g/L,复合镀层中PTFE颗粒含量呈现先升高,后降低趋势,并且颗粒分散状况不同,硬度呈现减小趋势,而耐磨性能逐步提高,然后变差。当PTFE颗粒添加量为8 g/L获得的Ni-WP/PTFE复合镀层中PTFE颗粒含量达到3.63%,并且颗粒分布趋于均匀,具有优良的耐磨性能,其摩擦系数仅为0.41,表面磨痕宽度和深度分别为500μm和14.7μm,作为表面改性层能有效减轻Cr12MoV模具钢的磨损程度。 展开更多
关键词 ni-w-P/PTFE复合镀层 化学镀 CR12MOV模具钢 耐磨性能
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时效对重度冷变形Ni-W-Co-Ta高密度合金组织和性能的影响
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作者 张鑫 熊毅 +4 位作者 查小琴 厉勇 舒康豪 杨苗苗 任凤章 《塑性工程学报》 CAS CSCD 北大核心 2023年第11期148-157,共10页
在650~900℃温度区间内对重度冷变形Ni-W-Co-Ta高密度合金(总压下量90%)进行了16 h时效处理,借助扫描电镜、透射电镜、X射线衍射仪、拉伸试验机和显微硬度计对不同温度时效处理前后合金的微观组织和力学性能进行了表征,探究了时效温度... 在650~900℃温度区间内对重度冷变形Ni-W-Co-Ta高密度合金(总压下量90%)进行了16 h时效处理,借助扫描电镜、透射电镜、X射线衍射仪、拉伸试验机和显微硬度计对不同温度时效处理前后合金的微观组织和力学性能进行了表征,探究了时效温度对合金组织和性能的影响规律。结果表明,重度冷变形可将Ni-W-Co-Ta高密度合金的晶粒细化至纳米量级。时效处理后新相Ni_4W从基体析出,且该相的尺寸和体积分数随时效温度的升高逐渐增大。合金的力学性能指标随时效温度的升高先增大后减小。当时效温度为700℃时,合金强度达到最大值,相应的抗拉强度和屈服强度分别为2286和1989 MPa,显微硬度为765 HV。时效温度为750℃时,冷变形合金开始发生再结晶现象。合金时效处理前后断口形貌均呈现韧-脆混合型断裂特征。 展开更多
关键词 时效 重度变形 ni-w-Co-Ta高密度合金 微观组织 力学性能
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Application and Present Research Status of Electrodeposited Ni-W Alloys 被引量:5
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作者 李晓闲 张雪辉 刘坚锋 《上海有色金属》 CAS 2010年第2期88-93,共6页
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活化处理对高速钢Ni-W-P化学镀层结合力影响
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作者 王靖炎 朱世照 +2 位作者 张振钢 马利杰 刘贯军 《工具技术》 北大核心 2023年第6期52-55,共4页
为提高Ni-W-P化学镀层与高速钢基体之间的结合力,重点研究了高速钢化学镀前的表面活化处理工艺。以不同浓度的盐酸、硫酸、氢氟酸和活化时间为研究对象,以Ni-W-P镀层与高速钢基体的结合力为研究指标,通过正交试验对活化剂组分和活化时... 为提高Ni-W-P化学镀层与高速钢基体之间的结合力,重点研究了高速钢化学镀前的表面活化处理工艺。以不同浓度的盐酸、硫酸、氢氟酸和活化时间为研究对象,以Ni-W-P镀层与高速钢基体的结合力为研究指标,通过正交试验对活化剂组分和活化时间进行优化。结果表明,在试验条件下,当活化剂中添加8%的浓盐酸和2.5%的氢氟酸(其余为水)并对高速钢基体进行3 min活化处理时,制备的Ni-W-P镀层与基体的结合力最大。 展开更多
关键词 化学镀ni-w-P 结合力 高速钢 活化处理
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含碳量对Ni-Cr-W-Mo合金显微组织及力学性能的影响
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作者 侯智鹏 鞠泉 《上海金属》 CAS 2023年第2期43-47,共5页
采用真空感应熔炼与电渣重熔相结合的工艺冶炼,随后锻造和热挤压制备了外径320 mm、内径280 mm,碳质量分数分别为0.04%、0.08%和0.12%的Ni-Cr-W-Mo合金管。对合金管进行了1 160~1 250℃保温20 min水冷的固溶处理。检测了热挤压态和固溶... 采用真空感应熔炼与电渣重熔相结合的工艺冶炼,随后锻造和热挤压制备了外径320 mm、内径280 mm,碳质量分数分别为0.04%、0.08%和0.12%的Ni-Cr-W-Mo合金管。对合金管进行了1 160~1 250℃保温20 min水冷的固溶处理。检测了热挤压态和固溶处理态合金管的显微组织和力学性能及固溶处理态合金管的高温持久性能。结果表明:热挤压态合金管晶粒细小且晶内有大量孪晶,碳化物弥散分布;随着含碳量的增加,相同温度固溶处理的合金管晶粒尺寸减小;随着固溶温度的提高,含碳量相同的合金管晶粒尺寸增大;合金管中碳化物主要为M6C和M23C6,弥散分布于晶内和晶界;随着含碳量的增加,合金管中碳化物数量增多,经1 220℃保温20 min水冷固溶处理的合金管的室温强度先降低后升高,断后伸长率降低,以及在927℃、80 MPa应力条件下的持久寿命和断后伸长率均先升高后降低。 展开更多
关键词 含碳量 ni-Cr-w-Mo合金 显微组织 力学性能
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Nucleation and growth mechanism of electrodeposited Ni−W alloy 被引量:8
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作者 Meng-chao YE Ting-ting DING +1 位作者 Hao ZHOU Feng-jiao HE 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2021年第6期1842-1852,共11页
The nucleation and growth mechanism of electrodeposited Ni−W alloy were investigated.Cyclic voltammetry(CV)and chronoamperometry(CA)were used to examine the electrochemical behavior and nucleation mechanism of the ele... The nucleation and growth mechanism of electrodeposited Ni−W alloy were investigated.Cyclic voltammetry(CV)and chronoamperometry(CA)were used to examine the electrochemical behavior and nucleation mechanism of the electrodeposited Ni−W alloy.The nucleation type and kinetic parameters of the electrodeposited Ni−W alloy were obtained from the CA analysis results.SEM,AFM,and TEM were also used to investigate the nucleation and growth process of the electrodeposition of Ni−W alloy.The results demonstrate that the nucleation and initial stages of the growth phase of the Ni−W alloy undergo the formation,movement,and aggregation of atoms,single crystals,and nanoclusters.When the size of single crystal increases up to approximately 10 nm and the average size of the crystal granules is approximately 68 nm,they no longer grow.Increasing the applied potential increases the number of nuclei but does not affect the size of the final crystal granules.Therefore,the electrodeposited Ni−W alloy shows a nanocrystalline structure. 展开更多
关键词 niw alloy ELECTRODEPOSITION NUCLEATION growth NANO-CRYSTALLINE
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Properties of electrodeposited amorphous Fe-Ni-W alloy deposits 被引量:10
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作者 何凤姣 王淼 陆欣 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2006年第6期1289-1294,共6页
A new technique of electroplating amorphous Fe-Ni-W alloy deposits was proposed.The structure and morphology o Fe-Ni-W alloy deposit were detected by XRD and SEM.The friction and wear behavior of Fe-Ni-W alloy deposit... A new technique of electroplating amorphous Fe-Ni-W alloy deposits was proposed.The structure and morphology o Fe-Ni-W alloy deposit were detected by XRD and SEM.The friction and wear behavior of Fe-Ni-W alloy deposit were studied and compared with that of chromium deposit.The corrosion properties against 5% sodium chloride,5% sulfuric acid and 5% sodium hydroxide were also discussed.The experimental results indicate that Fe-Ni-W alloy deposits have superior properties against wea than hard chromium deposits under dry sliding condition.Under oil sliding condition,except their better wear resistance,the deposits can protect their counterparts against wear.The deposits plated on brass and AISI 1045 steel show good behavior against corrosion o 5% sodium chloride,5% sulfuric acid and 5% sodium hydroxide.The bath of electroplating amorphous Fe-Ni-W alloy deposits is environmentally friendly and would find widely use in industry. 展开更多
关键词 ELECTRODEPOSITION AMORPHOUS Fe-ni-w alloy DEPOSITS wear RESISTANCE corrosion RESISTANCE
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Density and Structure Analysis of Molten Ni-W Alloys 被引量:3
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作者 FengXIAO LiangFANG 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2004年第4期410-413,共4页
Density of molten Ni and Ni-W alloys was measured in the temperature range of 1773-1873 K with a sessile drop method. The density of molten Ni and Ni-W alloys trends to decrease with increasing temperature. The densit... Density of molten Ni and Ni-W alloys was measured in the temperature range of 1773-1873 K with a sessile drop method. The density of molten Ni and Ni-W alloys trends to decrease with increasing temperature. The density and molar volume of the alloys trend to increase with increasing W concentration in the alloys. The calculation result shows an ideal mixing of Ni-W alloys. 展开更多
关键词 DENSITY Molar volume ni-w alloys STRUCTURE
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High-temperature tribological properties of Ni-P alloy coatings deposited by electro-brush plating 被引量:6
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作者 LI Zhiming QIAN Shiqiang +2 位作者 WANG Wei SHEN Hongwei LONG Hesun 《Rare Metals》 SCIE EI CAS CSCD 2011年第6期669-675,共7页
High-temperature tribological properties of Ni-P alloy coatings processed by electro-brush plating on 20CrMo steel have been investigated. A baU-on-disc configuration was employed and 4 mm diameter Si3N4 balls were us... High-temperature tribological properties of Ni-P alloy coatings processed by electro-brush plating on 20CrMo steel have been investigated. A baU-on-disc configuration was employed and 4 mm diameter Si3N4 balls were used as static counterpart. All the wear tests were carried out at 450℃ for 180 rain without lubricants. The electro-brush plating Ni-P coating is amorphous in as-deposited condition, and it becomes polycrystalline with the formation of Ni and Ni3P after heat treatment at 450℃for 1 h. The friction coefficient of the Ni-P coating is just 50% of that of the 20CrMo steel at the friction temperature of 450℃. A mild adhesive wear mechanism was found for the electro-brush plating Ni-P coating tested at 450℃, whereas for the 20CrMo steel at the same temperature a mixed adhesive and abrasive wear mechanism was observed. 展开更多
关键词 sliding wear high temperature electro-brush plating ni-P alloy coating surface analysis
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Effect of Heat Treatment on Structure and Magnetic Performance of Ni-Fe-P Alloy Obtained by Electroless Plating 被引量:4
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作者 WANG Sen-lin ZHANG Yong 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2005年第6期718-722,共5页
The electroless deposition of Ni68-Fe10.5-P21.5 alloy has been investigated. The crystallization behavior of the deposit was comparatively studied by using differential scanning calorimetry and X-ray diffractometry. T... The electroless deposition of Ni68-Fe10.5-P21.5 alloy has been investigated. The crystallization behavior of the deposit was comparatively studied by using differential scanning calorimetry and X-ray diffractometry. The deposit transforms into a square Ni3P phase at 380. 0 ℃, then changes into a cubic FeNi3 phase at 490. 0 ℃. The microhardness, the size of the formed grains and the magnetic performance of the deposit increase with the increase of the heat treatment temperature below 500 ℃, then they decrease after this temperature. The effect of heat treatment time at 500 ℃ on the surface micromorphology, the structure and the magnetic performance of the deposit were also studied. The resuits show that with the increase of heat treatment time, the extent of crystallization of the deposit increases and the size of the formed grains becomes uniform. The results also show that the magnetic performance of the deposit under heat treatment for 40 min is maximal and then decreases with the increase of heat treatment time. The property change of the deposit is related to the crystal structure and the size of the formed grains of the deposit. 展开更多
关键词 Electroless plating ni-Fe-P alloy Heat treatment Magnetic performance
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