On the induction plasma deposition of tungsten metal

The central particle injection and long residence time characteristics of induction plasma have given rise to the complete melting of tungsten particles injected into an Ar- H₂ plasma under soft vacuum conditions. The influences of process variables such as power level, chamber pressure, and spray distance on splat morphology, apparent density, and deposition efficiency have been studied. Dense tungsten deposits with no oxidation have been obtained. Scanning electron microscopy (SEM) micrographs reveal a well-flattened lamellar structure in deposits. Radiative cooling is observed to play a significant role in the plasma spraying of this refractory metal.     

镁合金超塑性研究

镁合金在室温下的塑性比较差，但在高温时塑性会有很大程度的改善。AZ31、AZ61、AZ91等合金在较高的温度和较慢的拉伸速率下具有超塑性。最新研究表明镁合金能够在低温和高变形速率下实现超塑性，因而具有工业化应用的可能。综述了镁合金超塑性研究领域的主要成果，分析了该领域研究中尚存在的一些问题，就今后的研究课题及发展方向进行展望。     

不锈钢埋弧焊用金属芯焊丝工艺性能的研究

研制的不镑铜埋弧焊用GDMA308金属芯焊丝，其熔敷金属化学成分和接头力学性能满足《CB／T17853—1999》要求。焊丝的工艺性能研究结果表明，由于金属芯焊丝中加入了活化剂，渣壳结构致密，气孔数量少，足寸小，配合HJ260焊接0Cr18Ni9不锈铜时，脱渣性能优良。     

数控加工模具型腔中的数据处理

模具型腔在数控加工中需要一套控制刀具运动轨迹的算法，本文给出了从模具型面的几何描述，加工数据的生成到形成Ｇ格式指令进行数控加工这一生产过程的数据处理，实验和现场加工的结果表明：该数据处理算法成功地解决了模具型面的加工制造问题。     

Microstructure and properties of TiB/Ti-6Al-4V coatings produced with laser treatments

TiB/Ti-6Al-4V metal-matrix composite (MMC) layers were produced on Ti-6Al-4V substrates by laser cladding. A TiB₂/Ti powder mixture was used as a precursor to obtain a dispersion of TiB needles in the Ti alloy matrix, with the aid of an exothermic reaction between TiB₂ and Ti. A eutectic microstructure was obtained that consisted of an extremely homogeneous dispersion of TiB eutectic needles in the Ti alloy matrix, having a volume fraction as high as 0.33. Also, an equilibrium-like microstructure was found, consisting of a dispersion of both primary and eutectic TiB needles inside the Ti alloy matrix. An analysis of the geometry of the layers was performed and proved successful in determining the percentage of B. Further, it correctly predicted the variation of atomic B content as a function of laser power. The relative wear resistance coefficient, defined as the wear coefficient of the uncoated matrix divided by that of coating, shows an improvement by a factor as high as 1500 for the eutectic microstructure. This paper was presented at the 2nd International Surface Engineering Congress sponsored by ASM International, on September 15–17, 2003, in Indianapolis, Indiana, and appeared on pp. 411–18 of the Proceedings.     

远程激光加工服务中心系统的研究与开发

概述了激光加工业的现状和市场特征，在比较了国内外远程制造的基础上，提出了一种基于Internet的远程湟加工服务中心系统模型，在此模型上建立了基于Web的服务中心信息管理系统，并论述了其关键技术，利用ASP技术及，DXF文件的特殊性实现了对二维板材加工的远程动态报价，同时也实现了用户认证，订单管理，商务洽谈，专家论坛等功能。     

Recent developments in engineering γ—TiAl intermetallics

γ-TiAl based alloys are rapidly being developed for elevated temperature applications,due to their high strength,light mass and good oxidation resistance.However,th disadvantages of TiAl based alloys are low ductility and toughness at room temperature,and poor workability.Grain refinement is one of the most effective ways for improving room temperature tensile properties and hot workability of ordered TiAl based alloys.At present,the majority of research works have focused on alloy modifications through compositional controls,alloying additions,thermo-mechanical processing and production techniques.This article discusses the research status of TiAl based alloys in the aras of microstructure,alloying,processing and applications.     

镀铬层表面等离子束流加热区视觉信息检测试验

论述了视觉传感技术的特点和研究现状。针对镀铬层固态表面传热及光路特点，选取了普通CCD摄像机，利用固态表面对电弧的反射光和加热工件自身的辐射光，在近红外波段取像的视觉采集方法。结合近红外光谱特点和CCD摄像机的光谱响应度变化趋势，在980nm波长的窗口区域提取到了清晰的视觉图像。分析了镀铬层固态表面等离子束流加热区图像的成像机理，在对加热区图像特征进行分析的基础上对图像进行了处理，提取出了有效信息。     

神经网络信息融合技术在岩石挖掘机系统故障诊断中的应用

将信息融合技术与神经网络结合起来，充分利用检测到的各种故障征兆信息准确诊断岩石挖掘机系统的故障。采用混合式数据融合方法，将数据级、特征级和决策级融合通过神经网络的方法综合在一起，解决输入信息不对称性问题，使得小数据量和大数据量的信息融合成为可能。     

铝带热连轧的工艺过程自动控制

热轧的自动化控制系统对轧制过程的稳定和带坯的精度起着十分重要的作用。目前国外在热连轧机上，已普遍采用以数学模型为基础的工艺过程控制系统（LEVEL2级）进行自动轧程表计算和轧机的设定值计算。论述了热连轧机自动化控制系统的组成，重点分析了LEVEL2级的功能及轧制策略和自动轧程表在带坯控制凸度和板形中的具体作用。