Influence of the preheated substrate temperature on the microstructure deposition behavior of the 304 stainless steel coatings deposited by cold gas dynamic spraying

The effects of the substrate temperature on the deposition and microstructure of the 304 stainless steel(SS)cold gas dynamic spraying(CGDS)coatings were investigated.It was found that the higher substrate temperature could increase the deposition rate of the 304 SS particles,even the oxide films existed at the interface.There was a critical oxide film with a thickness of 3-4 μm which could be destroyed by the impacted particles.The micro-hardness and microstructure of the 304 SS coatings under different substrate preheating temperatures were almost the sanle.     

浅析垃圾焚烧对窑系统运行的影响

城市生活垃圾无害化处理用于水泥生产利国、利民、利后代,安徽海螺水泥股份公司成为世界上第一家成功实践者。文章全面介绍了2×300t／d城市生活垃圾处理线（包括垃圾焚烧系统、不燃物处理系统、通风系统、污水处理系统、氯旁路系统等）的系统工艺流程;逐一分析了垃圾焚烧处理线投运后对窑系统的影响,包括对进入分解炉的气体量、气体温度、气体成分和有害物质等对熟料产质量的影响。目前,第一条300t／d垃圾处理线的处理量已达到350t／d,对窑产量的影响也明显小于预期。     

Novel control plane framework and protocol extensions for Spectrum-Efficient Optical Transport Networks

Spectrum-Efficient Optical Transport Networks (SE-OTN), the most important character of which is high spectrum efficiency due to flexible grid, have attracted much attention recently. However, it cannot be employed for practical use since most of the related protocols are immature. This paper mainly focuses on the framework and protocol extensions for the control plane of SE-OTN. A novel control plane framework is designed combining the advantages of Generalized Multi-Protocol Label Switching (GMPLS) and Path Computation Element (PCE), and several routing and spectrum assignment (RSA) models are built. Furthermore, motivation and extension solutions for Open Shortest Path First-Traffic Engineering (OSPF-TE), Resource ReSerVation Protocol-Traffic Engineering (RSVP-TE), and PCE Protocol (PCEP) are proposed based on this framework. An experimental testbed of large-scale spectrum-efficient optical networks with the capability of supporting 1000 GMPLS-based control nodes has been built to validate the performance of the protocols and algorithms, and some numeric results and analysis are given finally. Numeric results show that our proposed Centralized Routing and Centralized Spectrum Assignment (CR+CSA) model has better performance than Centralized Routing and Distributed Spectrum Assignment (CR+DSA) and Distributed Routing and Distributed Spectrum Assignment (DR+DSA), and spectrum defragmentation algorithm based on spectrum compactness can get good performance in the CR+CSA model.     

Rudimentary investigation of the HIP process for tungsten target

Zr alloy and 316-Ti stainless steel (S.S.) were selected as cladding materials for a W target. The HIP processes were performed at 1200, 1300 and 1400 °C and 180 MPa. The observation and determination for micro-morphology of the interface, diffusion depth and composition as well as their micro-hardness were conducted. The results indicated that the bonding of W-Zr and W-S.S. was good under the testing conditions. No pores or micro-cracks in the interface were observed. Grain growth of W was not observed at 1200 and 1300 °C, but it was observed at 1400 °C. The diffusion of Zr-W on the interface of W-Zr was preferred during the HIP process. The diffusion layer was 6-13 μm in thickness for W-Zr, and 13 μm for W-S.S. A peak of the hardness was observed at the interface of W-Zr or W-S.S. A part of the stainless steel cladding melted after HIP using an oxygen absorber (Zr) at 1300 °C and 180 MPa. The conditions of 1200 °C and 180 MPa without using an oxygen absorber Zr are suitable for W-S.S. bonding, while 1300 or 1400 °C and 180 MPa are better for W-Zr bonding.     

氯化钾对富钛溶液中Al~(3+)的净化作用

在富钛精矿酸解所得的溶液中加入 KCl,便形成以 KAl(SO4) 2 为主的沉淀 ,过滤沉淀可以去除 Al3 +杂质。试验研究了 KCl的加入量和溶液温度对 Al3 +沉淀率的影响。结果表明 KCl的加入量大于溶液质量的 2 0 %、溶液温度为 2 5℃时 ,Al3 +沉淀率已达到 75%以上 ,从而制备出了合格钛溶液     

基于2mm微马达的微型直升机设计与研制

介绍了一种微型直升机的设计与研制过程,该直升机主要由两个直径仅2mm的电磁微马达组成,整体结构设计简单、将微马达作为机身的一个组成部分,分别驱动两个微型旋翼产生升力,使微直升机离地起飞。     

炼钢生铁碎裂的成因及预防措施

阐述了炼钢生铁碎裂的成因及预防碎裂的措施。     

板料成形过程数值模拟中的接触分析

根据板料成形过程中模具的运动特点,提出了全局搜索和局搜索的接触点搜索算法。建立了接触点的局部坐标系,并对特殊情况进行了适当处理,保证计算的连续性,建立了接触力学模型,分别采用罚函地和修正的库仑摩擦计算接触法向力和摩擦力,保证了接触计算的稳定性。