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1.
Ni-P-PTFE化学复合镀层的耐磨性能研究   总被引:2,自引:2,他引:0  
邹刚  谢华 《润滑与密封》2007,32(10):87-89,127
制备了Ni-P-PTFE化学复合镀层,在MM-200型磨损试验机上研究了PTFE加入量、热处理温度和载荷对复合镀层摩擦因数和磨损量的影响。结果表明:镀层摩擦因数在PTFE加入量为8mL/L时最小,同时镀层磨损量在此时也最小;在不同热处理温度下,Ni-P-PTFE复合镀层表现出较好的耐磨性和较小的摩擦因数;当载荷超过98N后,镀层的摩擦因数增大;随着载荷的增大,镀层的磨损量增大。  相似文献   

2.
铝合金表面Ni-SiC复合镀层的摩擦磨损性能   总被引:3,自引:0,他引:3  
通过复合电沉积技术,在铝合金表面得到了不同SiC粒子含量的Ni-SiC复合镀层,研究了在干摩擦和液态石蜡润滑摩擦条件下载荷与SiC粒子体积分数对Ni-SiC复合镀层摩擦磨损性能的影响。结果表明:无论在干摩擦或润滑摩擦条件下,加入SiC粒子后的复合镀层其耐磨性均优于纯镍镀层,并随载荷的提高耐磨性下降。在干摩擦条件下,镀层中的SiC粒子体积分数在5.8%时复合镀层耐磨性最好;在润滑摩擦条件下,随镀层中SiC粒子体积分数提高,复合镀层耐磨性均提高。  相似文献   

3.
Ni-W-P/PTFE电刷镀多元复合材料工艺及性能研究   总被引:8,自引:0,他引:8  
用电刷镀技术使基体材料形成一层具有弥散硬质相及自润滑减摩组分的PTFE复合镀层。研究了Ni-W-P/PTFE电刷镀的工艺、刷镀液组成、热处理条件对Ni-W-P/PTFE复合镀层的硬度及磨损率的影响。确定了热处理温度378℃,复合镀层PTFE含量20%-30%时复合镀层的摩擦性能最好;当复合镀层中添加PTFE后能显著降低损率,大大提高镀层的耐磨性。  相似文献   

4.
不同粒度Al2O3复合涂层的磨粒磨损行为研究   总被引:5,自引:2,他引:3  
将微米级、亚微米级、纳米级3种粒度的Al2O3与Ni基自熔性合金制成复合粉末后,用氧乙炔焰热喷焊工艺制备出复合涂层,研究了载荷大小、磨损时间等对涂层耐磨粒磨损性能的影响。结果表明,在低载荷下.纳米Al2O3复合涂层的耐磨性最好;而在高载荷下,微米Al2O3复合涂层的耐磨性最好。  相似文献   

5.
电镀法制取耐磨耐蚀复合镀层的性能研究   总被引:11,自引:1,他引:10  
讨论了复合镀层的物理、化学性能。结果表明,复合镀层在镀态是非晶态,在400℃等温时,镀层由非晶态转化为晶态,伴随NixPy相析出;在镀液中加入少量的添加剂,能提高复合镀层的硬度、耐磨性和晶化温度;热处理温度以 合镀层的硬度和耐磨性有较大的影响,400℃时,硬度和耐磨性达到最佳值;复全镀层的耐磨性优于硬铬,在腐蚀介质中的耐蚀性优于1Cr18Ni9Ti不锈钢。  相似文献   

6.
在镀液中加入不同含量的碳纳米管,用复合电沉积工艺制备了碳纳米管/铅锡合金复合镀层,测试了其在不同载荷下的摩擦因数和磨损量,并对其磨损形貌和磨损机理进行了分析。结果表明:在相同条件下,碳纳米管/铅锡合金复合镀层的摩擦因数和磨损量均低于普通铅锡合金镀层的;当镀液中的碳纳米管含量为2 g·L~(-1)时,复合镀层的摩擦因数和磨损量最小;复合镀层的磨损机理为磨粒磨损,而不含碳纳米管的铅锡合金镀层的为粘着磨损。  相似文献   

7.
镍-磷-纳米Al2O3复合镀层的摩擦学性能   总被引:5,自引:1,他引:4  
用化学镀的方法制备了镍-磷-纳米Al2O3复合镀层,研究了热处理温度对镀层硬度和磨损性能的影响,并与二元镍-磷镀层以及镍-磷-Al2O3复合镀层进行了性能对比。结果表明:含有纳米Al2O3微粒的复合镀层具有更高的硬度和耐磨性,经400℃处理后的镀层耐磨性最好。  相似文献   

8.
Ni-P-Cr2O3化学复合镀层耐磨性的研究   总被引:2,自引:0,他引:2  
研究了热处理对Ni-P-Cr2O3化学复合镀层组织结构、硬度及耐磨性的影响,并与Ni-P镀层作了对比。结果表明,镀层的摩损规律与硬度变化规律不同,采用正确的热处理工艺,可使镀层的硬度及耐磨性显著改善。  相似文献   

9.
Ni-P-纳米Al_2O_3复合镀层的抗微动磨损性能   总被引:1,自引:0,他引:1  
以纳米Al2O3为增强相,利用化学镀技术,制备了Ni-P-nanoAl2O3复合镀层,以球-面接触方式评价了复合镀层在300 μm振幅下的微动摩擦学行为,并与Ni-P二元镀层进行了性能对比.研究了不同载荷、频率下复合镀层的摩擦因数和磨损量.结果表明,Ni-P-nanoAl2O3复合镀层的摩擦因数比Ni-P二元镀层的高,相对Ni-P二元镀层而言,复合镀层的抗微动磨损能力得到了有效地提高,相对耐磨性最大达到2.24,其磨痕呈浅而窄的"W"型,在低载下的微动属于轻微的擦伤式磨损,高载下则转变为明显的磨粒磨损机制.  相似文献   

10.
研究了高尔夫击球头用钛合金表面复合化学镀Ni-P-金刚石微粉的工艺过程,对复合镀层的性能进行了测试,分析了各工艺参数对镀层性能的影响。  相似文献   

11.
An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...  相似文献   

12.
The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...  相似文献   

13.
黑棣  郑美茹 《机电工程》2016,(11):1315-1321
针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。  相似文献   

14.
The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.  相似文献   

15.
马立新  王宏宇 《机电工程》2015,32(1):118-122
针对传统的电力系统多目标粒子群优化算法采用权重系数法将多目标转化为单目标,从而忽视了各目标函数间的竞争关系这一问题,提出将非支配解提取法运用到电力系统多目标无功优化中,并设定了一套提取规则,以电力系统中的有功网损、电压偏差和电压稳定裕度为目标,使目标在充分竞争的情况下得出Pareto最优解,利用IEEE-14节点系统对多目标非支配解提取法的电力系统无功优化进行了仿真测试。研究结果表明,该算法一次运行可以得出多组非支配解,既有偏向单个目标的解也有兼顾所有目标的解,克服了权重系数法的盲目性和单一性,可使电力决策者根据实际问题选择最优解,具有较好的灵活性与多样性。  相似文献   

16.
The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....  相似文献   

17.
The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...  相似文献   

18.
A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.  相似文献   

19.
This article describes designing, implementation and tuning processes of multiple-tapped-delay-line (MTDL). Obtained MTDL can be implemented in various field-programmable-logic-devices (FPGA) devices and applied for time-to-digital-converters (TDC) construction. The task of tuning process is the tapped-delay-line (TDL) linearisation, and consists of two stages. The first stage depends on selecting an appropriate configurable-logic-block (CLB) for particular delay-segment realization and selecting proper connection between these blocks. The second tuning stage, that is essential from this article viewpoint, depends on inter CLBs connecting wires delay regulation realized directly by load regulation. The Load regulation depends on connecting an appropriate number of unused three-state-buffers or CLB inputs to the wire which delay is adjusted. Depending on the number of inputs connected to the wire its capacitance changes that influences its time-constant and finally changes its time-delay.The MTDL mathematical model, obtained characteristics and results of time-interval (TI) measurements are also presented. The derived TDL model provides information about how the particular wire delay should be changed and in which order the changes should be executed. This makes the designing process predictable and easy to carry out. Presented characteristics confirm the proper operation of presented linearisation technique. The proper operation of the whole measuring module is confirmed by obtained TIs histograms presentation.  相似文献   

20.
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