The friction and wear properties of amorphous carbon nitride(a-CN x)coatings in water lubrication were reviewed.The influences of mating materials and tribological variables such as normal load(W)and sliding speed(V)o...The friction and wear properties of amorphous carbon nitride(a-CN x)coatings in water lubrication were reviewed.The influences of mating materials and tribological variables such as normal load(W)and sliding speed(V)on the friction and wear properties of the a-CN x coatings were analyzed.It was indicated that the specific wear rate of the a-CN x coatings was related to the hydration reaction of mating materials with water.If the mating materials were easily hydrated,the specific wear rate of a-CN x coatings was low.The water-lubricated properties of the a-CN x coatings were better in comparison to the a-C coatings.The a-CN x/Si-based non-oxide ceramics tribo-pairs exhibited the lowest friction coefficient and wear rate.To describe their friction and wear properties at the normal loads of 3—15Nand the sliding speeds of 0.05—0.5m/s,the wear-mechanism maps for the a-CN x/SiC(Si3N4)tribo-pairs in water were developed.展开更多
成功展示了一种像元间距23．5μm的非制冷红外（IR）焦平面（FPA），在热相法、安全摄像机等领域有广泛的商业应用。非制冷IRFPA的一个关键议题是减小像元间距，因为像元间距的大小决定了FPA的总体尺寸，最终也就确定了红外摄像产品的...成功展示了一种像元间距23．5μm的非制冷红外（IR）焦平面（FPA），在热相法、安全摄像机等领域有广泛的商业应用。非制冷IRFPA的一个关键议题是减小像元间距，因为像元间距的大小决定了FPA的总体尺寸，最终也就确定了红外摄像产品的成本。本文提出了一种新的像元结构，光阑和悬梁放置在不同层上，实现了一种像元间距更小（≤17μm）的非制冷红外焦平面。上层包括了带有VOx测辐射热计和红外吸收层的光阑。下层包括两个悬梁，设计为放在相邻像元上。12μm、15μm、17μm间距这种像元结构测试器件已经制作于si读出集成电路（ROIC）上，这种读出电路适用于23．5μm间距的QVGA（quarter video graphics array）（320×240）其性能基本等同于23．5μm间距的红外焦平面。例如，对于热时间常数为14．5ms的F／1光学来说，12μm像元的噪声等效温差为63．1mK。所以，对于现有的23．5μm的红外焦平面，这种新提出的结构是有效的，在红外灵敏度方面有改进。接下来，双层悬梁的先进像元结构柏．展示了其可行性。展开更多
基金Supported by the National Natural Science Foundation of China(50675102,50975137,51375231)the Program for New Century Excellent Talents in University(NCET-10-068)+2 种基金the Research Fund for the Doctoral Program of Higher Education(20133218110030)the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)Japan Society for the Promotion of Science under Grant-in-Aid for Scientific Research(JSPS Fellows P03219)
文摘The friction and wear properties of amorphous carbon nitride(a-CN x)coatings in water lubrication were reviewed.The influences of mating materials and tribological variables such as normal load(W)and sliding speed(V)on the friction and wear properties of the a-CN x coatings were analyzed.It was indicated that the specific wear rate of the a-CN x coatings was related to the hydration reaction of mating materials with water.If the mating materials were easily hydrated,the specific wear rate of a-CN x coatings was low.The water-lubricated properties of the a-CN x coatings were better in comparison to the a-C coatings.The a-CN x/Si-based non-oxide ceramics tribo-pairs exhibited the lowest friction coefficient and wear rate.To describe their friction and wear properties at the normal loads of 3—15Nand the sliding speeds of 0.05—0.5m/s,the wear-mechanism maps for the a-CN x/SiC(Si3N4)tribo-pairs in water were developed.
文摘成功展示了一种像元间距23．5μm的非制冷红外（IR）焦平面（FPA），在热相法、安全摄像机等领域有广泛的商业应用。非制冷IRFPA的一个关键议题是减小像元间距，因为像元间距的大小决定了FPA的总体尺寸，最终也就确定了红外摄像产品的成本。本文提出了一种新的像元结构，光阑和悬梁放置在不同层上，实现了一种像元间距更小（≤17μm）的非制冷红外焦平面。上层包括了带有VOx测辐射热计和红外吸收层的光阑。下层包括两个悬梁，设计为放在相邻像元上。12μm、15μm、17μm间距这种像元结构测试器件已经制作于si读出集成电路（ROIC）上，这种读出电路适用于23．5μm间距的QVGA（quarter video graphics array）（320×240）其性能基本等同于23．5μm间距的红外焦平面。例如，对于热时间常数为14．5ms的F／1光学来说，12μm像元的噪声等效温差为63．1mK。所以，对于现有的23．5μm的红外焦平面，这种新提出的结构是有效的，在红外灵敏度方面有改进。接下来，双层悬梁的先进像元结构柏．展示了其可行性。
