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1.
探讨了不同含量、不同大小SiCp增加ZA27复合材料的摩擦磨损特性,并借助SEM,EDAX对磨面及其剖面、磨屑进行了分析。  相似文献   

2.
SiCp颗粒增强AZ80镁合金的摩擦磨损特性   总被引:5,自引:1,他引:4  
蔡叶  苏华钦 《铸造》1995,(8):1-5
本文研究了喷射搅拌铸造法制备的SiCp/AZ80复合材料的摩擦磨损性能。结果表明:复合材料的耐磨性优于基体合金;复合材料磨损表面存在由GCr15对磨环转移的富铁层,使复合材料-GCr15摩擦副的摩擦系数比AZ80-GCr15摩擦副低;复合材料的对磨环磨损量大于基体合金的对摩环磨损量,但复合材料摩擦副的总磨损量比基体合金摩擦副的小。  相似文献   

3.
颗粒增强ZA27基复合材料的摩擦磨损行为   总被引:6,自引:0,他引:6  
李晓辉  谢敬佩 《铸造》1999,(11):36-39
用挤压浸渍法制备了SiCp/ZA27及Al2O3p/ZA27复合材料,讨论了颗粒含量及种类对复合材料边界润滑条件下磨损性能的影响;对复合材料的摩擦磨损行为进行了研究。结果表明,随着颗粒含量的增加,复合材料的耐磨性增强,摩擦系数增大。复合材料的磨损以粘着磨损和磨粒磨损为主。  相似文献   

4.
SiCp尺寸及其体强度对铝基复合材料破坏机制的影响   总被引:9,自引:0,他引:9  
吕毓雄  毕敬  陈礼清  赵明久 《金属学报》1998,34(11):1188-1192
对粉末冶金法制备的尺寸分别为3,5,10,20μj的SiCp增强Al-Cu基复合材料的拉抻断口及EDX成分上尺寸大于10μm时,复合材料的破坏因于SiCp解理形成的裂纹:增强相尺寸为3.5μm时,复合材料的破坏则归因为SiC-Al界面撕裂形成空洞和裂纹,拉伸试验表明,小尺寸SiCp增强的复合材料人有拉伸强度及延伸率。  相似文献   

5.
SiCp/ZA27复合材料的制备及其力学性能   总被引:20,自引:1,他引:19  
探讨了半固态机械搅拌法制备SiCp/ZA27复合材料的工艺,以及SiCp含量、大小对复合材料抗拉强度和硬度的影响,并对其抗拉断口进行了SEM分析。结果表明:用该工艺可制得SiCp分布较均匀的锌基复合材料,其强度随SiCp含量、粒度的增大而减小;经SEM分析,其断口呈部分韧性断裂,且断裂机制因SiCp含量、大小的不同而不同;当复合材料中V(SiCp)<5%时,其硬度值随加入量的增加而升高,当V(SiCp)>5%时,随含量增加而降低,且小颗粒SiCp增强复合材料的硬度比大颗粒的要高。  相似文献   

6.
在Falex摩擦磨损实验机上研究了碳纤维增强碳基体(C/C)复合材料在不同载荷下的摩擦磨损性能,且对摩擦表面进行了SEM观察和分析。研究结果表明:C/C复合材料的摩擦系数随着载荷的增大呈现出先增大后减小的趋势,而磨损量则随着载荷的增大,整体呈现出逐渐增大的趋势;在高载荷下表面形成的磨屑膜,是导致摩擦系数减小的原因之一;随着载荷的逐渐增大,C/C复合材料的磨损由磨粒磨损为主逐渐向粘着磨损为主转变。  相似文献   

7.
利用销-环摩擦试验机研究了干式条件下,以SiO2微粒弥散硬化的A185Ni5Y8Co2合金非晶质粉末挤压超细晶棒材的耐磨性。结果表明,随着SiO2质量分数的增加,合金的耐磨性提高。摩擦过程中,粘着磨损和生成磨屑的磨粒磨损反复作用并不断加强,其中尤以磨粒磨损显着。还利用透射电镜与电子探针X射线对磨屑形貌与成分进行了分析。  相似文献   

8.
利用锁-环摩擦试验机研究了干式条件下,以SiO2微粒弥散硬化的Al85Ni5Y8Co2合金非晶质粉末挤压超细晶棒材的耐磨性。结果表明,随着SiO2质量分数的增加,合金的耐磨性提高。摩擦过程中,粘着磨损和生成磨屑的磨粒磨损反复作用并不断加强,其中尤以磨粒磨损显着。还利用透射电镜与电子探针X射线对磨屑形貌与成分进行了分析。  相似文献   

9.
Al2O3/TiB2/SiCw陶瓷材料的高温氧化行为   总被引:1,自引:0,他引:1  
采用热压烧结工艺制备了Al2O3/TiB2/SiCw陶瓷复合材料,研究了SiC晶须含量对其高温氧化行煌影响。用XRD,SEM,TEM/EDS分析了材料氧化后的相组成及显向结构,探讨了该材料的氧化机理。结果表明:不同SiCw含量的Al2O3/TiB2/SiCw陶瓷材料在1400℃空气中氧化30h的氧化增重符合抛物线规律。  相似文献   

10.
SiCp颗粒复合对ZA27合金耐磨性能的影响   总被引:2,自引:0,他引:2  
用铸造法制备了SiCp/ZA27复合材料,用MM200磨损试验机,测定和对比了基体合金和不同颗粒含量复合材料在不同载重下的磨损量。结果表明:在重载条件下,复合材料的耐磨性远高于基体材料。  相似文献   

11.
By use of X-ray diffractometry and scanning electron microscope(SEM),the friction and wear results obtained from MM-1000 dynamometer tests of CVI pitch/resin C/C composites were analyzed.By investigating the factors that affected the friction and wear properties,such as matrix carbon,applcation environment,graphitization degree and brake pressure,etc,friction and wear mechanism of carbon materials were probed.The results indicate that pitch densified CVI initially treated composite is more graphitizable with its graphitization degree up 59 62%,and which results in uniform small debris easier to generate,more smooth friction curves with the coefficient of 0.3-0.4 and relatively higher wear and mass loss,compared with CVI/resin C/C composites.It was further proved by SEM observation that tribological behavior of C/C composite was system dependent.Factors determining the friction and wear properties such as the size of debris and its influence on friction and wear,brake pressure,graphization degree and debris bilm formation interacted and affected each other.The friction and wear mechanism of C/C composites under different high temperature treatments needs further research.  相似文献   

12.
不同成分对C/C-SiC材料摩擦磨损行为的影响与机理   总被引:10,自引:2,他引:8  
采用温压-原位反应法制备C/C-SiC复合材料,研究了SiC、石墨和树脂炭成分对C/C-SiC材料摩擦磨损行为的影响及其机理.结果表明:SiC在摩擦表面摩擦膜的形成过程中起骨架作用,提高SiC的含量有利于提高摩擦系数,降低磨损率;树脂炭在材料中具有粘结各成分和提高摩擦系数的作用,但其成膜性较差,易增大磨损率;石墨粉在制动过程中起润滑作用,适量石墨粉有助于形成稳定的摩擦膜降低磨损率;摩擦表面摩擦膜的形成有利于减少C/C-SiC材料的磨损率.  相似文献   

13.
The graphite (Gr)/MoS2 reinforced Mg self-lubricating composites were prepared through powder metallurgy. The composites were characterized for microstructure, physical, mechanical and wear properties. Gr/MoS2 phase in the composites was identified by XRD analysis. Microstructural observation showed that the Gr/MoS2 particles were homogeneously dispersed within the magnesium matrix. Micro-hardness was measured using an applied load of 5 g with a dwell time of 15 s at room temperature. Hardness of all the composites was measured to be in the range of VHN 29–34. The mechanical properties were studied using micro-hardness, tensile and compression tests. A fractographic analysis was performed using scanning electron microscope. The highest values of hardness, compressive strength and tensile strength were attained using Mg–10MoS2 composite. A pin-on-disk tribometer was used to measure the friction coefficient and the wear loss of the sintered composites. In addition to that, the friction and wear mechanism of the composites were systematically studied by worn surface characterization and wear debris studies using SEM analysis. The reduced friction coefficient and wear loss were achieved in MoS2 rather than Gr.  相似文献   

14.
The present work deals with the investigation on weight loss and coefficient of friction of TiC reinforced Al-4.5%Cu in situ metal matrix composites. Experiments were conducted using pin-on-disc apparatus against abrasive paper by varying the applied load, sliding distance, and weight percentage of TiC. The results indicated significant improvement in the mechanical properties and wear resistance of experimental composites as compared to the parent metal matrix. The percentage of porosity though increased with increasing TiC reinforcement. The variation of weight loss of composites increased linearly with increasing applied load and sliding distance, whereas decreased with increasing weight percentage of TiC reinforcement. The coefficient of friction decreased linearly with increasing applied load and TiC reinforcement. SEM micrographs of worn surfaces show a well compacted transfer layer of wear debris along with wear track over the sliding surface. Grooves, delamination, and crack propagation were also observed in all test samples. The effective depth of penetration and size of debris was seen to reduce with increasing wt.% of TiC reinforcement in metal matrix.  相似文献   

15.
Carbon nanotubes (CNTs) were coated by tungsten layer using metal organic chemical vapor deposition process with tungsten hexacarbonyl as a precursor. The W-coated CNTs (W-CNTs) were dispersed into Cu powders by magnetic stirring process and then the mixed powders were consolidated by spark plasma sintering to fabricate W-CNTs/Cu composites. The CNTs/Cu composites were fabricated using the simi-lar processes. The friction coefficient and mass wear loss of W-CNTs/Cu and CNTs/Cu composites were studied. The results showed that the W-CNT content, interfacial bonding situation, and applied load could influence the friction coefficient and wear loss of W-CNTs/Cu com-posites. When the W-CNT content was 1.0 wt.%, the W-CNTs/Cu composites got the minimum friction coefficient and wear loss, which were decreased by 72.1% and 47.6%, respectively, compared with pure Cu specimen. The friction coefficient and wear loss of W-CNTs/Cu composites were lower than those of CNTs/Cu composites, which was due to that the interfacial bonding at (W-CNTs)-Cu interface was bet-ter than that at CNTs-Cu interface. The friction coefficient of composites did not vary obviously with increasing applied load, while the wear loss of composites increased significantly with the increase of applied load.  相似文献   

16.
The effects of silicon particle content and testing temperature on friction and wear properties of casting in-situ silicon particle reinforced ZA27 composites were investigated. The wear mechanisms were mainly discussed by observations of both worn surfaces and their side views. The results indicated that the variations of wear resistance with increasing of silicon particle content, at all of the testing temperatures applied, showed a similar tendency with a manner of non-monotonous change. It was surpdsed that the wear resistance decreased with the increase of silicon particle content from 2 vol.% to 5 vol.%, while it increased when the content was less than 2 vol.% or more than 5 vol.%. Similarly, the friction coefficient also did not change monotonously. The dominative wear mechanism changed from a relatively severe regime of plastic deformation accompanied by adhesion wear to a mild regime of smear, then to a very severe regime of severe plastic deformation induced wear, and finally again to a relatively mild regime of smear accompanied by abrasive wear as the silicon content increased. The wear resistance always decreased with elevating testing temperature, but the decrease ranges were different for the composites with different silicon contents. The friction coefficients changed irregularly for the different composites with the increase of testing temperature. Correspondingly, the wear mechanism alternated from a mild regime of smear accompanied by abrasive wear to a severe regime of plastic deformation accompanied by adhesion wear.  相似文献   

17.
通过采用粉末冶金和原位合成技术相结合的近净成形技术制备Al-5%Si-Al2O3复合材料,并运用M一2000摩擦磨损试验机对该复合材料的摩擦磨损性能进行研究。通过单一变量比较法分析载荷和滑动速度对Al-5%Si-Al2O3复合材料摩擦磨损性能的影响,同时对长时间连续磨损下该材料的摩擦性能进行研究。通过扫描电子显微镜对Al-5%Si-Al2O3复合材料的磨损表面进行观察,并分析其磨损机制。结果表明,随着载荷的增大,试样的磨损量和摩擦因数均增加;随着滑动速度的增大,试样表面的升温使得产生氧化层的速率增加,试样的磨损量和摩擦因数均减少。在长时间的连续磨损过程中,由于初始时发生粘着磨损,试样的摩擦因数随着滑动距离的增大而增大。然后,试样表面氧化层的形成和破坏趋于动态平衡,试样表面相对稳定,其摩擦因数也随之趋于平稳。铝基复合材料的磨损机制主要为磨粒磨损、粘着磨损和氧化磨损。  相似文献   

18.
The effects of MoS2 content on microstructure, density, hardness and wear resistance of pure copper were studied. Copper-based composites containing 0–10% (mass fraction) MoS2 particles were fabricated by mechanical milling and hot pressing from pure copper and MoS2 powders. Wear resistance was evaluated in dry sliding condition using a pin on disk configuration at a constant sliding speed of 0.2 m/s. Hardness measurements showed a critical MoS2 content of 2.5% at which a hardness peak was attained. Regardless of the applied normal load, the lowest coefficient of friction and wear loss were attained for Cu/2.5MoS2 composite. While coefficient of friction decreased when the applied normal load was raised from 1 to 4 N at any reinforcement content, the wear volume increased with increasing normal load. SEM micrographs from the worn surfaces and debris revealed that the wear mechanism was changed from mainly adhesion in pure copper to a combination of abrasion and delamination in Cu/MoS2 composites.  相似文献   

19.
熔融渗硅对二维编制炭/炭复合材料摩擦特性的影响   总被引:5,自引:1,他引:4  
为了改善航空刹车副用炭/炭复合材料的摩擦磨损性能,对二维编制C/C复合材料的摩擦机理进行了深入的研究;对比了试样渗Si后及渗Si前的实验结果,着重研究了试样不同的渗Si量对摩擦磨损行为及特性的影内。结果发现渗Si的试样比没有渗Si试样摩擦曲线线型好,并且摩擦试验过程中的振动现象也得到了解决。但摩擦因数随着所生成SiC含量的增加,由0.35→0.32→0.28呈下降趋势;磨损量随着所生成SiC含量的增加而增大;当有大量的不均匀的SiC颗粒生成时,C/C复合材料的摩擦表面将会被剥落,并从材料的微观性能及摩擦机理方面给予了深入的分析。  相似文献   

20.
The uniformly dispersed carbon nanotubes (CNTs) reinforced 6061Al composites (CNT/6061Al) with different CNT concentrations were fabricated by powder metallurgy technology. It was found that the friction coefficient as well as wear rate decreased first and then increased as the CNT concentration increasing under 15 N as well as 30 N, and the minimum wear rate was achieved at the CNT concentration of 2 wt%. Adhesive wear and abrasive wear were the dominated wear mechanisms for the 1-2 wt% CNT/6061Al composites under 15 N and 30 N, while the delamination occurred on the wear surface at 3 wt% CNT. As the applied load increased to 60 N, the wear rate of composites increased dramatically. The wear mechanism transformed from abrasive wear to severe delamination wear, accompanied by the generation of wear debris with sharp edge due to the weaker anti-shearing strain capacity of CNT/6061Al composites.  相似文献   

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