With the increasing demand for industrial product quality and safety verification, conventional nondestructive testing (NDT) technology is hardly able to fulfil the specialized requirements such as re
钛合金由于具有密度小、比强度高、耐腐蚀等优异性能而被誉为"宇宙金属",但钛合金的低耐磨性限制了其更广泛的应用。随着航空航天科技的飞速发展,对钛合金的性能也提出了更高的要求。本研究利用激光技术在TC4钛合金样品表面刻蚀出间距分别为100μm,200μm,300μm,直径分别为100μm,150μm,200μm的点阵型织构和宽度分别为100μm,150μm,200μm的沟槽型及网格型织构,基于CSM摩
J55 steel pipe is a sort of oil extraction equipment which is commonly used for oil-pumping operation on some oil fields. Nonetheless, it is acknowledged that this kind of material is easily corroded
针对陶瓷内衬复合钢管的超声无损检测,提出了一种基于分形维数的管件缺陷定位方法。采用超声A扫描对陶瓷内衬复合钢管试件的不同部位进行了扫查,获得了多组超声波振动时域信号,分别计算其分形维数,通过比较分形维数的变化,找出了可能存在缺陷的异常部位。结果 表明:超声A扫描信号具有良好的分形行为特征,可通过计算其分形维数,与正常范围进行比较,初步确定管件异常部位,进而为下一步深入检测提供依据。
步进摩擦学是研究人体在行走过程中与地面产生间歇性相互作用的基本规律,在航空、航天、航海、医学和制鞋等领域具有广阔的应用背景。本文以45钢作为地板材料,制备出不同的表面粗糙度,利用止滑试验机研究了材料表面形貌与摩擦因数的关系,利用本实验室自主研制的步进摩擦试验平台研究了材料表面形貌对人体步进防滑性能的影响。实验表明:静止状态下,随着表面粗糙度的增加摩擦因数减小,纹理间距与摩擦因数呈正相关;人体行走过
In this research, the element of tantalum was chosen to be an alloying element onto the M50 steel by surface alloying in order to improve the high temperature friction properties. Before the surface a
Superhydrophobic coating is widely used in the fields of self-cleaning, anti-corrosion, anti-icing, water proofing, biomedical instrument. However, the poor durability prominently limits its applicati
热障涂层技术是航空发动机中叶片的重要防护技术,有了高性能的热障涂层可以对基体金属进行充分的保护,提高叶片的使用寿命。纳米结构的涂层和烧绿石结构的锆酸盐被认为是高性能热障涂层的两个重要的发展方向。最近悬浮液热喷涂技术渐渐得到了认可,尤其是纳米/亚微米表面工程领域,不断地利用悬浮液热喷涂技术是实现着高效纳米涂层的制备。悬浮液等离子喷涂是悬浮液热喷涂中的一个重要发展方向。本文中,为了提高纳米锆酸镧(LZ
Smart coatings can adjust its own properties to adapt to the environmental changes such as temperature, light intensity, stress, etc. to achieve smart working. Smart coatings have played more and more