共查询到19条相似文献,搜索用时 62 毫秒
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Al2O3—SiO2短纤维增强ZL109复合材料滑动磨损性能研究 总被引:2,自引:1,他引:2
采用压铸法制取了Al2O3-SiO2短纤维增强ZL109复合材料,并对其滑动磨损性能进行了研究。结果表明,纤维含量及分布规律是影响复合材料磨损性能的重要因素。随着纤维体积含量增加,复合材料的摩擦磨损性能提高;当纤维取向垂直于摩擦面时,复合材料的摩擦磨损性能比纤维平行于摩擦面取向要好。复合材料的磨损机制主要为氧化磨损和磨粒磨损,在较高载荷下将出现层离和剥落。 相似文献
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本文通过复合材料磨面,磨屑及亚表层的SEM特征分析,研究了3Al2O3.2SiO2f/Al-Si复合材料的润滑衣干滑动磨损机理。润滑状态下复合材料的耐磨性大大优于Al-Si合金,其磨损为纤维断裂与剥落及磨粒磨损;而复合材料在干滑动条件下的耐磨性反而稍差于Al-Si合金,其磨损为粘着磨损,磨粒磨损和层离剥落。 相似文献
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采用电磁搅拌方法,向Al熔体中加入AlNH4(SO4)2,反应生成了Al2O3颗粒,成功制备了Al2O3/Al复合材料.采用此方法制备复合材料成本低、工艺简单.试验结果表明,生成的Al2O3颗粒小,均匀分布在Al基体上,具有显著的增强效果,复合材料的硬度远高于基体材料. 相似文献
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用压铸法制备Al2O3f/Al-Si复合材料(Vf=10%、15%、25),研究了载荷对该复合材料滑动磨损行为的影响规律。研究表明:复合材料的稳定磨损阶段比其基体合金更为持久,磨损失效的临界值也大大滞后。随着增强纤维体积分量的升高,这种滞后效应更加明显。借助SEM对复合材料及其基体合金的磨损形貌进行了观察和讨论。 相似文献
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本文研究了硅酸铝纤维增强Al-Si复合金复合材料在润滑状态下磨损性能,结果表明,Al-Si复合材料的耐磨性优于基体合金,随纤维体积分数增加,复合材料耐磨性增加。基体合金Si含量对复合材料耐磨性没有明显影响Al-Si合金中加入Mg元素,可显著提高其复合材料的耐磨性。 相似文献
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用压铸法制备Al2O3f/Al-Si复合材料,并使纤维分布呈统计二维择优取向,研究了该复合材料的“磨损量-时间”关系和磨损机制,结果表明:Al2O3短纤维垂直和平行于摩擦表面时,在“磨损量-时间”关系上没有显著差异,但两者的纤维损伤和脱落过程有所不同,借助SEM这一过程进行了观察并建立了相应的模型。 相似文献
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Influence of Al2O3 reinforcement on the abrasive wear characteristic of Al2O3/PA1010 composite coatings 总被引:2,自引:0,他引:2
In the present study, the abrasive wear characteristics of Al2O3/PA1010 composite coatings were tested on the turnplate abrasive wear testing machine. Steel 45 (quenched and low-temperature tempered) was used as a reference material. The experimental results showed that when the Al2O3 particles have been treated with a silane coupling agent (γ-aminopropyl-triethoxysilane), the abrasive wear resistance of Al2O3/PA1010 composite coatings has a good linear relationship with the volume fraction of Al2O3 particles in Al2O3/PA1010 composite coatings and the linear correlation coefficient is 0.979. Under the experimental conditions, the size of Al2O3 particles (40.5-161.0 μm) has little influence on the abrasive wear resistance of Al2O3/PA1010 composite coatings. By treating the surface of Al2O3 particles with the silane coupling agent, the distribution of Al2O3 particles in PA1010 matrix is more homogeneous and the bonding state between Al2O3 particles and PA1010 matrix is better. Therefore, the Al2O3 particles make the Al2O3/PA1010 composite coatings have better abrasive wear resistance than PA1010 coating. The wear resistance of Al2O3/PA1010 composite coatings is about 45% compared with that of steel 45. 相似文献
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润滑条件对Al2O3基陶瓷材料摩擦磨损性能的影响 总被引:1,自引:0,他引:1
本文对Al2O3基陶瓷材料/45#钢摩擦副的摩擦系数与45#钢/45#钢的摩擦系数作了对比滑动摩擦试验研究,观测分析了Al2O3基陶材料磨痕形貌,并就干摩擦,油润滑状态下Al2O3基陶瓷材料的磨损机理进行了分析。结果表明,分别在干摩擦和20#机油润滑下,Al2O3基陶瓷材料/45#钢的摩擦系数均比45#钢自配副时的低,在干摩擦条件下,Al2O3基陶瓷材料的磨损机理是脆性微剥落和磨粒磨损,油润滑条件下,该材料的磨损机理是脆性脱落和耕犁,但磨损量小于干摩擦条件下的磨损量,说明油润滑对Al2O3基陶瓷材料有明显的减磨作用。 相似文献
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Very little research effort has been directed at development of models of erosion–corrosion of composite materials. This is because, in part, the understanding of the erosion–corrosion mechanisms of such materials is poor. In addition, although there has been a significant degree of effort in the development of models for erosion of MMCs, there are still difficulties in applying such models to the laboratory trends on erosion rate.In this paper, the methodology for mapping erosion–corrosion processes in aqueous slurries was extended to particulate composites. An inverse rule of mixtures was used for the construction of the erosion model for the particulate MMCs. The corrosion rate calculation was evaluated with reference to the matrix material.The erosion–corrosion maps for composites showed significant dependency on pH and applied potential. In addition, the corrosion resistance of the matrix material was observed to affect the regime boundaries. Materials maps were generated based on the results to show the optimum composite composition for exposure to the environment. 相似文献
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Sliding wear characteristics of plasma-sprayed Al2O3 and Cr2O3 coatings against copper alloy under severe conditions 总被引:2,自引:0,他引:2
Al2O3 and Cr2O3 coatings were deposited by atmospheric plasma spraying and their tribological properties dry sliding against copper alloy were evaluated using a block-on-ring configuration at room temperature. It was found that the wear resistance of Al2O3 coating was superior to that of the Cr2O3 coating under the conditions used in the present study. This mainly attributed to its better thermal conductivity of Al2O3 coating, which was considered to effectively facilitate the dissipation of tribological heat and alleviate the reduction of hardness due to the accumulated tribological heat. As for the Al2O3 coating, the wear mechanism was plastic deformation along with some micro-abrasion and fatigue-induced brittle fracture, while the failure of Cr2O3 coating was predominantly the crack propagation-induced detachment of transferred films and splats spallation. 相似文献
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