覆层

The cross-sectional size of the PBG cover is greatly reduced and its dimension is only 145 mm×145mm which is about 2/3 smaller than the cover designed by Thevenot et al.

该覆层结构还大大缩小了尺寸，其横截面尺寸只有145mm×145mm，该尺寸比Thevenot等人设计的覆层减小了约2/3，比Qiu等人设计的覆层减小了约6/7。

Tight alloying layer with undulation and without visual pocket and inclusion has been obtained by experiment.The alloying layer is metallurgically combined with the matrix.

试验结果获得了致密、无肉眼可见气孔、夹杂、熔覆表面有一定起伏的合金层，合金层与基体间完全冶金结合；熔覆合金层由单相Fe3 Al构成，覆层组织为粗大的柱状晶团，柱状晶团内包含大量极细小的板条状Fe3 Al晶粒，一些相邻的板条晶之间具有基本相同的晶体学取向。

The antiablation of silicone rubber liner can be improved both by changing the structure of unvulcanized rubber and adding antiablative fillers,and the bond strength between propellant charge and the liner would be increased largely by coating the primer liquid on the charg...

硅橡胶包覆层中填料的粒径对硅橡胶的补强效果十分重要；可从改变生胶结构、添加耐烧蚀填料两方面来改善硅橡胶包覆层的耐烧蚀性；在推进剂药柱表面上涂覆底涂液可以大幅提高硅橡胶包覆层与推进剂的粘接强度。

The results show that during laser cladding, SiC of different forms is decompounded partially; with the increasing of the SiC adding content, the quantity of un-melt SiC increases and hardness of cladding layers improves.

结果表明，随着加入量的增加，熔覆层中未熔SiC含量增加，熔覆层硬度也随之提高；对比加入颗粒状和纤维状SiC的熔覆层的显微硬度表明，同含量情况下纤维状SiC的强化效果更显著；造成熔覆层硬度显著提高的原因是未熔SiC，析出相FeSiC的弥散强化和熔入的Si，C元素引起的固溶强化作用。

The process of Covering Cr12MoV steel with Carbides in fused salt was studied.

本文研究了Cr12MoV钢在熔盐中的碳化物覆层技术，介绍了覆层工艺方法，探讨了该工艺的机理，测试了碳化物覆层的性能。

The results show that from the interface to surface the microstructure of the cladded coating is composed of plane grains,tiny grains and fine dendritic grains. The two main compositions of Ni and Cr homogeneously distribute in the section.

结果表明，熔覆修复层的显微组织从界面往上依次由平面晶、细晶层和中部细小的树枝晶构成，主要元素Ni和Cr在截面内均匀分布，原有Cr层与熔覆层内的Cr元素呈连续状，构件修复区以外的铬层与基体的结合未受激光熔覆的影响。

Using high frequency calefaction equipment, MoSi2 ceramic powder and Ni-based self-fluxing powder blended in different proportion were cladded on W6Mo5Cr4V2 steel surface. And Ni-based alloy claddings with different MoSi2 content were obtained. The microstructure of cross-section of the claddings were analyzed; the microhardness and multi-physical parameters of the claddings were measured.

中文摘要：以W6Mo5Cr4V2高速钢为基体，在其表面利用MoSi2陶瓷粉末配制的Ni基自熔性合金粉末进行高频感应加热熔覆，制得不同MoSi2配比的Ni基合金覆层；对覆层横剖面进行微观组织分析和显微硬度测试，并对熔覆层的热物性参数进行测定及分析讨论。

The enhance nient of the corrosion resistance laser dadoling of the CNTs/Ni60 coatings is due to that the reserved carbon nanotubes in the coatings segregate the corrosive medium and promote N-based alloy passivation, the formed phases of the carbide and the reserved carbon nanotubes homogenous distribution in the claddings resist die corrosion.

碳纳米管／镍基激光熔覆层耐腐蚀的原因在于熔覆层保留的碳纳米管使熔覆层更加致密，隔离了腐蚀介质，促进了镍基合金的钝化，从而提高了熔覆层的耐蚀性；同时，熔覆层中保留下来的碳纳米管和被分解的碳纳米管与金属基体形成碳化物，作为增强相均匀弥散在熔覆层中，它们的存在阻止了腐蚀坑的长大，因而蚀坑较小，耐腐蚀性得到提高。

The part of the cover that lies over LED bulb irradiation is semicircle curved surface that simulates the glass tube luminous-surface of neon light

一包覆层，由柔性塑料挤出成型一个用于包覆上述芯线、散光体及多个LED灯泡的、与上述芯线等长度的包覆层，该包覆层的位于LED灯泡照射上方的部分是一模拟霓虹灯玻璃管状发光面的半圆形曲面

Self-fluxing Fe-Cr-Ni-B-Si alloy prowders are laser clad on medium carbon steel substrate of dimensions 80×35×10mm〓. The investigation results of this clad layer are: micro-defects, micro-cavity and occluded forin substance, are the micro-cracks and crack resourses in clad layer; crack of coating propagates along the boundary of two kinds of eutectic sutructure; The included angle θ between the cracking direction and laser scanning direction in multitrack overlapping clad is smaller than that in one-track clad because of crack propagating along crystalline growth direction and crystalline direction in overlapping zone being different from it in one-track clad.

在调质态的45〓钢表面，采用预置粉末法进行FeCrNiBSi合金的多道搭接激光熔覆，对其熔覆层进行分析表明：多道搭接激光熔覆层裂纹扩展方向与激光扫描方向间的夹角θ与单道熔覆时相比明显变小，前者θ0°，后者θ角基本都为90°，这主要是因为多道搭接时，搭接区结晶方向发生了变化以及裂纹沿结晶方向扩展所致；激光熔覆层裂纹大多是以覆层与基材交界面的孔洞、熔覆层内不同方向共晶团间的显微缩孔、夹杂物的边界等三种显微缺陷作为裂纹源，并沿低熔点物相形成元素偏析造成弱化膜的共晶团界面扩展延伸。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失