王艳秋
,
吴昆
,
郑明毅
金属学报
采用微弧氧化表面处理技术在SiCw/AZ91镁基复合材料表面制备保护性涂层。通过与AZ91镁合金对比，研究镁基复合材料的微弧氧化行为及其形貌特征，并采用电化学方法评价了微弧氧化涂层的耐腐蚀性能。结果表明，由于SiC晶须的加入影响了阻挡层的形成，使复合材料的微弧氧化行为不同于基体合金。与合金相比，复合材料在恒电流模式下进行微弧氧化的过程中电压随时间的演变趋势不够理想，而且在相同条件下镁基复合材料的起弧时间比合金要长，导致复合材料在火花放电之前发生腐蚀。SiCw/AZ91镁基复合材料在微弧氧化过程中可能会出现烧蚀现象。虽然SiC晶须会影响复合材料表面涂层的形成，微弧氧化处理仍然能够增强镁基复合材料的耐腐蚀性能，在提高其腐蚀电位的同时降低腐蚀电流。当采用恒压模式制备涂层时，涂层耐腐蚀性能随电压的提高而增强。
关键词:
镁基复合材料
,
Microarc oxidation
,
Coatings
,
Corrosion resistance
Daoxin LIU
,
Xiaodong ZHU
,
Bin TANG
,
Jiawen HE
材料科学技术（英文）
Ion beam enhanced deposition (IBED) was employed to increase the fretting fatigue resistance of Ti6Al4V. CrN and TiN hard coatings were applied on the base material and shot peening was combined with the hard coatings to study the duplex effect on fretting fatigue resistance. The IBED coatings exhibited a good bonding strength. They did not spall off even after shot peening. However, an optimum composition of CrN showed better fretting fatigue resistance than that of TiN with the same processing parameters.
关键词:
Fretting fatigue
,
null
,
null
,
null
Dongming GUO
材料科学技术（英文）
For the first time, the texture of copper and Cu-ZrB2 coatings produced from copper nitrate solution was studied. Chloride ion shows different effects on the deposit texture under direct current (DC) and pulse current (PC) conditions. Copper deposits are strongly <220> textured in DC plating with and without chloride ion. While in PC condition, the predominant texture shifts from <220> to <200> as the chloride ion concentration exceeds 20 mg/l. The addition of ZrB2 particles enhances the cathodic polarization of copper deposition, which improves the growth of (111) plane. However, this improvement can be eliminated by further addition of chloride ion.
关键词:
Texture
,
null
,
null
,
null
王开石
,
匡松连
宇航材料工艺
doi:10.3969/j.issn.1007-2330.2016.06.001
近年来,新研航天飞行器气动热环境往往具有高焓、高热流密度和长时间加热等特点,这促使防热材料的研制朝着低密度、高抗烧蚀、优良隔热等性能的方向发展.受自身材料类型的限制,无论烧蚀型(树脂基)或非烧蚀型(陶瓷基)防热材料都可以通过对烧蚀表面进行涂层处理的手段达到弥补材料性能短板,提高使用性能的目的.本文试图梳理、总结国内外近年来热防护系统用涂层材料的发展状况,探讨各自的优势和缺点,并提出了针对树脂基复合材料热防护涂层可能趋势的推测.
关键词:
航天飞行器
,
热防护系统
,
涂层
,
烧蚀
