Amorphous Si O2（a-Si O2） films were synthesized on WC-Co substrates with H2 and tetraethoxysilane（TEOS） via pyrolysis of molecular precursor.X-ray diffraction（XRD） pattern shows that silicon-cobalt compounds for...
详细信息
Amorphous Si O2（a-Si O2） films were synthesized on WC-Co substrates with H2 and tetraethoxysilane（TEOS） via pyrolysis of molecular precursor.X-ray diffraction（XRD） pattern shows that silicon-cobalt compounds form at the interface between a-Si O2 films and WC-Co ***,it is observed by transmission electron microscope（TEM） that the a-Si O2 films are composed of hollow mirco-spheroid a-Si O2 ***,the a-Si O2 films are used as intermediate films and chemical vapor deposition（CVD） diamond films are deposited on *** tests were performed to evaluate the adhesion of bi-layer（a-Si O2 ＋ diamond） films on cemented carbide *** the cutting performance of bi-layer（a-Si O2 ＋ diamond） coated inserts was evaluated by machining the glass fiber reinforced plastic（GFRP）.The results show that a-Si O2 interlayers can greatly improve the adhesive strength of diamond films on cemented carbide inserts;furthermore,thickness of the a-Si O2 interlayers plays a significant role in their effectiveness on adhesion enhancement of diamond films.
针对航天器微振动高性能隔振的特殊要求,提出一种基于网结构的新型隔振方法,对由振源-网结构-弹性边界构成的耦合系统进行了振动建模与分析。对于网结构,采用子结构导纳综合法建立其模型,获得了垂直于网面的频域振动方程;对于边界梁,采用弦-梁单向耦合,将动态张力沿垂直和水平方向分解,得到振动响应的完整描述。在此模型基础上,分析了耦合系统的振动传递特性。为验证理论的正确性,设计并搭建了网结构微振动实验台。结果表明,网结构平台具有良好的被动隔振效果,在较宽的频段内,可以实现20 d B以上的振动衰减。
暂无评论