某型航空发动机活塞石墨层厚度检测技术的应用与分析

本文介绍了非接触式涂层测厚仪在航空发动机修理中的应用，重点对活塞石墨层厚度接触式与非接触式检测技术的原理、优缺点和在应用中遇到的故障问题进行了分析和研究。同时，结合某型发动机活塞表面石墨层过厚导致装机后呈片状脱落故障，通过对石墨层厚度使用接触式检测技术的改进，分析石墨层超厚脱落的原因，结合先进的光热法非接触式涂层测厚技术的应用，并对如何防止石墨层因测量方法不当导致的涂层过厚装机后再次发生脱落给出相应的改进建议。     

石墨炉原子吸收光谱分析仪器技术的现状与发展

本文从原子化器，多元素同时测定石墨护原子吸收光谱分析法和石墨炉空间分辨光谱技术的研究等三方面论述了石墨炉原子吸收光谱分析仪器技术的现状与发展，指出石墨炉原子吸收光谱分析法虽面临挑战，但却是进入一个新的发展时期。     

人造石墨粉末选择性激光烧结成形工艺实验研究

将选择性激光烧结技术应用于人造石墨粉末成形，探索其回收循环再利用的可能性。研究了球形石墨粉末的加入量对人造石墨/酚醛树脂混合粉末流动性和堆积密度的影响，确定了石墨3D打印材料配方组成；研究了激光功率、扫描速度、扫描间距和分层厚度等工艺参数对石墨原型件的成形精度和抗弯强度的影响，确定了各工艺参数的取值范围；最后通过正交实验确定了最优工艺参数组合，并快速制备了复杂石墨功能件，验证了新工艺的可行性。     

苛刻工况下的高性能石墨密封技术研究

介绍了金属对金属接触的密封机理，比较并研究了高性能石墨密封技术性能特点，得出高性能石墨密封技术能有效应用于各类苛刻工况，提升设备的密封性能。     

石墨的非还原热离子发射特性

本文在近期所发表的有关文章的基础上，对石墨的非还原热离子发射特性进行了系统的总结。对石墨在Ｃｓ２ＢＯ＾＋２，Ｃｓ２Ｃｌ＾＋和Ｃｓ２Ｂｒ＾＋离子发射中的增强作用进行了讨论，并给出采用石墨涂样技术正热电离质谱法高精度测定硼氯溴同位素的结果。     

机械密封用碳石墨环现状与展望

介绍了碳石墨材料的分类、特点以及国内外碳石墨材料的生产概况,结合旋转接头用碳石墨环制造应用,提出了对现行机械密封用碳石墨环技术标准的补充修订建议,针对国内碳石墨材料存在问题的现状,向行业主管部门提出了攻关愿望,结合国内碳石墨材料的技术进展和发展趋势进行了展望。     

基于视频分划技术的石墨轴承同轴度质量检验系统

阐述了基于视频图形分划生成技术的石墨轴承同轴度的检验原理，通过CCD摄取电能表石墨轴承的图象，给出了直接对石墨轴承的同轴度进行检验的装量和新方法，并提供了详细的视频分划生成硬件电路结构原理图，该电路可实现单片机对RAM写图形信号和在地址刷新电路的作用下把RAM中图形的数据并行输出，经过并串转换与CCD视频信号叠加送到显示器上显示，实现视频图形分划生成技术，并可以通过单片机软件编程实现检测功能。     

液晶石墨粘结技术

液晶石墨粘结技术液晶粘结剂是指粘结材料的分子结构处于液晶态，分子是分层排列的。液晶既具有流体的流动性，又具有晶体的光学性质。精制石墨块的粘结是通过液晶粘结剂的外延生长完成的。由于石墨块很脆，加工的成本率很低，液晶石墨粘结技术可以高效低耗地加工大尺寸的...     

国产部分细颗粒石墨的辐照行为

石墨因其具有优异的高温性能和良好的核能技术而用于反应堆中,但石墨受到辐照的影响。使其物理性能发生改变,从而影响它的使用寿命。对我国部分国产细颗粒石墨,即等静压石墨和三高石墨,进行辐照行为研究,得到了石墨尺寸变化和热膨胀系数变化数据,分析辐照对石墨寿命的影响。并评价我国石墨辐照性能指标。     

关于活塞环材质的无石墨空白带

应用缺陷生长，成分过冷，晶核的脱落与增殖等概念，提出D型石墨和E型石墨的形成在于奥氏体晶核领先析出，而奥氏体枝晶的特征决定了石墨的类型是D型还是E型，决定了无石墨空白带的形状和大小，它是低强度相，影响到环材质的断裂，尤其F14材质必需对其进行研究，文中对无石墨空白带的影响因素及其对策进行了讨论，供有关专家研讨。     

Antagonistic Interaction of Antiwear Additives and Carbon Black

It is well known that the presence of soot in engine oils can lead to an increase in wear of engine parts. This is a growing problem as soot levels in diesel engine oils are rising due to a combination of extended drain intervals and the various methods employed to reduce NO _x formation such as retarded ignition and exhaust gas recirculation. Several different mechanisms have been proposed by which soot might lead to an increase in wear in mixed lubrication conditions, of which the most widely favoured is abrasion by soot, either of the rubbing metallic parts in engines or of the antiwear additive films formed on rubbing metal surfaces. In this study it is shown that the combination of mixed alkyl ZDDP and carbon black (used as soot surrogate) is strongly antagonistic in terms of wear. In a lubricant containing carbon black, the presence of ZDDP leads to considerably more wear than if ZDDP is left out. A similar, though less severe antagonism is also seen with primary ZDDP and other antiwear and EP additives. By varying the lubricant film thickness it is shown that the effect of carbon black in ZDDP-containing oils is to promote wear up to quite thick hydrodynamic film conditions, approaching the secondary carbon black particle size. It is proposed that the antagonistic wear effect results from a corrosion-abrasive mechanism in which the reaction film formed by antiwear additive and rubbing metal surface is very rapidly and continually abraded by carbon black. At most carbon black concentrations, wear rate then becomes controlled by the rate of initial antiwear additive film formation, which for secondary ZDDP is very rapid, rather than by the kinetics of the abrasive process. From this understanding, strategies for reducing the impact of engine soot on wear can be deduced.     

Pyrometry using CCD cameras

The method of measurement of the surface brightness temperature distribution in high-enthalpy wind tunnels using CCD cameras is described. The problems of the operating wavelength selection, CCD camera metrology, and camera calibration by a black body and temperature lamps, as well as the possibility of LED reference etalon usage for correction of optical channel transmission variation are discussed. It is proposed to measure the emission spectrum of the surface under investigation for brightness pyrometry validation and for surface emissivity evaluation.     

辐射光谱测温法测量误差实验研究

针对辐射光谱测温法测量误差问题,利用黑体炉搭建了标准辐射测温实验平台,选用200~1 100nm波段光谱仪对标准高温源进行辐射光谱测量。讨论了高温源辐射光谱特征,并基于辐射光谱测温法获得了温度测量值,该值与标准参考值的相对偏差小于4%,同时分析了测量重复性引起的标准不确定度分量,为辐射测温法应用提供参考。     

50车轴钢中异常组织的形成原因

用光学显微镜、透射电子显微镜以及电子探针等现代材料试验手段对50钢中存在的大块黑色团状异常组织进行了研究和分析。结果表明，这种黑色团状异常组织是由片间距不同的团状珠光体组成。产生这种组织的主要原因是50车轴钢锻造后混晶现象严重及存在特别粗大晶粒。     

滚珠丝杆导程谩差动态检测仪及其系统误差修正研究

采用误差修正技术，提高仪器检测精度，是精密工程中重要的技术之一。本文介绍一种用微机控制和误差修正补偿技术的精密丝杆导程动态检测仪，对这一技术的工作原理、系统结构、接口电路。误差分析与实验结果进行了研究。     

滚珠丝杆导程谩差动态检测仪及其系统误差修正研究

采用误差修正技术,提高仪器检测精度,是精密工程中重要的技术之一.本文介绍一种用微机控制和误差修正补偿技术的精密丝杆导程动态检测仪,对这一技术的工作原理、系统结构、接口电路.误差分析与实验结果进行了研究.     

基于SD卡的塔机黑匣子的研制

基于AVR单片机ATmega32和SD卡研制了大容量数据存储的塔机黑匣子.该黑匣子应用DXZ型多功能行程限位器测量塔机吊重的高度和幅度,应用BLR-1型称重传感器测量吊重质量,利用编码器测量塔机的回旋角度,采用EC21B型风速传感器记录实时风速,选择PCF8563产生日历时钟,选用大容量SD卡存储塔机运行状态数据.黑匣子既可以实现对塔机运行状况数据的实时记录又具有预报警、强制断电以及历史数据回放等功能.     

黑火药中硫磺木炭的连续测定法

本文主要介绍黑火药中的硫磺、木炭连续测定的方法。并将原有的分析周期三天缩短为一天,成本降低,运用可靠。     

Parameter estimation and statistical analysis on frequency-dependent active control forces

The active control forces of an active magnetic bearing (AMB) system are known to be frequency dependent in nature. This is due to the frequency-dependent nature of the AMB system, i.e. time lags in sensors, digital signal processing, amplifiers, filters, and eddy current and hysteresis losses in the electromagnetic coils. The stiffness and damping coefficients of these control forces can be assumed to be linear for small limit of perturbations within the air gap. Numerous studies have also attempted to estimate these coefficients directly or indirectly without validating the model and verifying the results.This paper seeks to address these issues, by proposing a one-axis electromagnetic suspension system to simplify the measurement requirements and eliminate the possibility of control force cross-coupling capabilities. It also proposes an on-line frequency domain parameter estimation procedure with statistical information to provide a quantitative measure for model validation and results verification purposes. This would lead to a better understanding and a design platform for optimal vibration control scheme for suspended system. This is achieved by injecting Schroeder Phased Harmonic Sequences (SPHS), a multi-frequency test signal, to persistently excite all possible suspended system modes. By treating the system as a black box, the parameter estimation of the “actual” stiffness and damping coefficients in the frequency domain are realised experimentally. The digitally implemented PID controller also facilitated changes on the feedback gains, and this allowed numerous system response measurements with their corresponding estimated stiffness and damping coefficients.     

基于面阵CCD图像的温度场测量研究

推导出具有实物面的高温辐射体温度和CCD像素点亮度之间的关系。结合比色测温法，给出一种基于彩色CCD图像的温度场测量方法。用一套经黑体炉标定过的测温系统，分别在黑体炉和普通煤炉上进行测温试验，取得较好结果。通过比较计算温度值和热电偶测量值，分析了本测温方法的误差来源。