KW-3/25-602型钨铼快速热电偶

KW-3/25-602型钨铼快速热电偶,采用国内新技术及钨铼新丝材研制而成。具有测量温度高(上限温度可达1800℃)、测温精度准(±0.5%t)、测量速度快(热响应时间小于等于3秒)、原材料丰富、造价低廉等优点。是目前铂铑合金快速热电偶理想的更新换代产品,可广泛应用于冶金行业。用户使用证明,该产品各项性能指标均达到国家标准要求。 KW-3/25-602型钨铼快速热电偶于1992年12月22日通过由鸡西市经济委员会主持召     

高精度钨铼热电偶丝及抗氧化钨铼热电偶

高精度钨铼热电偶丝及抗氧化钨铼热电偶中国冶金技术公司成都公司仪表厂研制成功并推向市场的高精度钨铼热电偶丝及抗氧化钨铼热电偶、系采用最先进的“雾化法”工艺生产，具有热电势高、灵敏度好、热电势线性好、稳定性好和价格便宜等优点。该产品被列入国务院生产办“八...     

钨铼热电偶在铁水连续测温中的应用

在铁水温度的连续测定中,使用钨铼热电偶既可靠又经济,在使用中还不容易发生跑铁水的事故。钨铼热电偶的测量精度可以满足对铁水温度的连续检测。钨铼5/20的连续使用寿命在一定的保护条件下可达到二百多小时,它的稳定性维持在130～150小时内,其测量误差不超过铁水温度最高值的±1.0％,也就是说,接近双铂铑热电偶。同时钨铼热电偶材料来源丰富,价格便宜,每对米仅六十元左右。再加钨铼热电偶使用安全,因而受到欢迎。     

钨铼热电偶在重油裂化炉测温中的应用

近年来,随着高温测量的需要,一种耐高温、抗还原性能强的测温元件——钨铼。——钨铼_(20)热电偶(以下简称钨铼热电偶)在工业温度控制过程中得到推广应用。本文主要介绍     

钨铼热电偶及其应用

钨铼热电偶及其应用成都钨金热工仪表厂罗拥军在工业生产过程的高温测量和控制中，广泛使用的是贵金属铂铑热电偶。在一些场合中，由于不同介质和气份等复杂因素，铂铑热电偶的寿命较短及价格昂贵，现在有了理想的替代产品──金属钨铼热电偶。我国六十年代初开始对钨铼热...     

ASTM E988—90钨铼热电偶温度—热电动势表

1 范围 1-1 本标准主要包括97％钨3％铼配75％钨25％铼、95％钨5％铼配74％钨26％铼热电偶的分度表(温度热电动势表)。这两类难熔金属热电偶广泛应用于工业测温。 1-2 本标准还包括1-1条所列热电偶型号的初始分度允差(表1)及其配用的补偿导线合金丝的初始分度允差(表2)。 1-3 这些数据适用于工业和实验室测温。 2 数据来源     

钨棒炉2100℃测温装置

钨棒炉的超高温测量，采用钨铼热电偶延伸安装绝缘保护的方法和自行设计的一种结构新颖的组合式保护套管配合使用，装试一套经济实用、无腐蚀污染毒害的高温直接测量装置，解决了用热电偶直接连续测量２１００℃高温的测量技术。     

基于LabVIEW的瞬态温度测试系统

针对极端工况下瞬态温度动态诊断的难题,设计了以钨铼快速热电偶为传感元件和LabVIEW为开发平台的测试系统,对热电偶进行了冷端温度补偿,实现了在侵蚀环境下的瞬态温度的诊断.对锌熔滴扁平过程瞬态温度测试表明,其温度变化范围在ms级,并以波形图的形式显示出了瞬态温度的变化情况,对其进行了分析.该系统可用于发动机进口、爆发器内壁等工业和军工中需要快速高温测量的领域.     

高温测量的方法及装置

本发明介绍了一种测量高温的热电偶,这种热电偶的热电元件是由耐氧化的耐火材料制成。高温热电偶仅限于对于其热电稳定性没有很大的影响的环境中使用,这样在许多应用中使许多可采用材料受到了限制。例如,除了钼族元素之外,所有的金属都不能被用来制做在氧化环境中的高温热电偶;在强烈的还原环境中,金属中也仅有钨、钼、铼能显示出所需的化学稳定性。在过去当热电偶的使用环境不适当时,通常把热电偶元件装入耐火的金属保护套管中来使用,并同时加以惰性气体。当温度快速波动时采用保护套是不利的,因为这样会使热电偶对     

多工能钢水及炉窑连续测温专用仪表开发研制

本文介绍了一种钢水及炉窑连续测温专用仪表,它具有连续测温曲线打印记录、测温偏移植的特殊补正、钨铼偶与铂铑偶信号转换、热电偶冷端高温补偿功能等,再配以作者所开发的有关实用技术(如浮漂式钢水连续测温技术,分体组装式热电偶装置,难熔金属薄壁内保护管开发),使系统测温精度大大提高,保证灵敏准确无误的进行连续测温。     

High temperature erosion of tantalum carbide composites

Selected compositions of tantalum carbide composites containing excess free carbon and tungsten-rhenium were tested for erosion resistance at 1800 °C and room temperature. Specimens were fabricated at 2150 °C using hot pressing techniques. Tantalum carbide exhibited superior erosion resistance at both temperatures and displayed evidence of cutting erosion only. Graphite and hafnia-tungsten composites exhibited less erosion resistance at both temperatures and displayed evidence of both cutting and deformation erosion.     

工业用热电偶分度方法的研究

热电偶是工业中应用广泛的测温元件，为保证热电偶能准确可靠的工作，要定期对其进行检定，对于标准热电偶还要给出分度公式。对于工业用热电偶国标并未给出分度方法，本文提出了使用标准热电偶分度方法对工业热电偶进行分度的方法。通过实验和计算证明在分度范围内这种分度方法是可行的。     

测量切削温度的自然热电偶的物理本质

本文推导了说明自然热电偶物理本质的表达式、这表达式说明：自然热电偶测得的电动势可视为：在每一分热电偶的电阻值都相等的情况下,所有分热电偶电动势的代数和平均值。本文考虑到影响自然热电耦接触电阻值的各因素,推导了自然热电耦测得的电动势E与各分热电偶的电动势E I及实际接触面积A (ri)的关系式。本文还用实验检验了这表达式的正确性。     

Determination of thermal plume thickness using thermocouple cross correlation coefficient decay

A methodology to measure the thickness of a thermal boundary layer by cross correlating the signal from thermocouples is presented. It is shown that measurement of temperature, velocity, and boundary layer thickness is achievable using a single sensor utilizing three thermocouples rather than the typical two thermocouples used in the cross correlation velocimetry technique discussed in literature. The methodology is validated using experiments performed in two laboratory scale devices: a heated turbulent jet and a variable diameter natural gas burner. Experimental measurements are compared with theoretical calculations, and uncertainty in the measurement is discussed.     

基于虚拟仪器的热电偶自动检定系统研究

介绍利用虚拟仪器构建热电偶自动检定系统的总体结构 ,标定系统的硬件组成及软件设计。该系统能对常用的热电偶进行静态、动态的标定 ,自动实现数据的采集、处理 ,直接给出标定曲线     

用热电偶测量薄板温度时的导热误差分析

用热电偶测量恒热流条件下薄板的温度时,沿热电偶丝的热量导出将引起接触区域的温场畸变,从而产生导热误差。本文对该导热误差公式进行了详细推导,分析了影响导热误差的各种因素,并且提出了减小导热误差的方法。     

基于薄膜热电偶的高速切削动态温度监测系统设计

提出了一种基于薄膜热电偶传感器的高速切削动态温度监测新方法.采用磁控溅射、光刻技术、PECVD等方法在立方氮化硼(PCBN)高速切削车刀前刀面上沉积多层薄膜,制备NiCr/NiSi薄膜热电偶传感器.详细阐述了薄膜温度传感器的制备过程,设计了高速切削温度和切削力的数据采集与监测系统.以高速数据采集卡PCI-9118为硬件,结合Tchart控件,采用VC ++编制简洁友好的人机界面来实现对高速切削温度和切削力数据的实时采集、显示与分析.试验表明,设计的数据采集和监测系统使用方便、灵活、可靠.     

基于NANMAC热电偶的时间常数测试技术研究

本文介绍了热电偶时间常数的测试理论,提出了运用瞬态表面温度传感器动态校准系统实现对NANMAC热电偶时间常数的测试方法。该系统对红外探测器和热电偶进行了静态校准和动态校准,得到两者的温度一时间曲线。由于红外探测器的频率响应优于被校准热电偶的频率响应,因此,以红外探测器测得的值作为真值,用热电偶测得的值与红外探测器测得的值相比得到-条归-化的曲线,并由归-化曲线求得热电偶的时间常数。利用该方法对NANMAC热电偶进行时间常数的测试实验,得到了该热电偶的时间常数。实验结果表明：该时间常数测试方法是可行的,可以实现对微秒、毫秒量级热电偶的动态校准,这对于NANMAC热电偶温度传感器的研究和应用具有一定的参考价值。     

Noncatalytic thermocouple coatings produced with chemical vapor deposition for flame temperature measurements

Chemical vapor deposition (CVD) and metal-organic chemical vapor deposition (MOCVD) have been employed to develop alumina thin films in order to protect thermocouples from catalytic overheating in flames and to minimize the intrusion presented to the combustion process. Alumina films obtained with a CVD process using AlCl(3) as the precursor are dense, not contaminated, and crystallize in the corundum structure, while MOCVD using Al(acetyl acetone)(3) allows the growth of corundum alumina with improved growth rates. These films, however, present a porous columnar structure and show some carbon contamination. Therefore, coated thermocouples using AlCl(3)-CVD were judged more suitable for flame temperature measurements and were tested in different fuels over a typical range of stoichiometries. Coated thermocouples exhibit satisfactory measurement reproducibility, no temporal drifts, and do not suffer from catalytic effects. Furthermore, their increased radiative heat loss (observed by infrared spectroscopy) allows temperature measurements over a wider range when compared to uncoated thermocouples. A flame with a well-known temperature profile established with laser-based techniques was used to determine the radiative heat loss correction to account for the difference between the apparent temperature measured by the coated thermocouple and the true flame temperature. The validity of the correction term was confirmed with temperature profile measurements for several flames previously studied in different laboratories with laser-based techniques.     

In situ response time testing of thermocouples

Response time information is important in most applications involving transient temperature measurements with thermocouples. Traditionally, the response time of a thermocouple is measured in a laboratory at a reference condition. The laboratory response time information is useful for comparative evaluation of thermocouples but may have little relationship with the response time for the sensor in service. This is because of the effects of installation and process operating conditions on response time.

A method has been developed and validated for response time testing of thermocouples as installed in an operating process. The details are reviewed in this paper. The method is referred to as the Loop Current Step Response Test. The test involves an internal heating of the thermocouple by applying an electrical current to the thermocouple extension wires. The current is then terminated and the thermocouple output is monitored as it returns to ambient temperature. This transient output is analyzed to identify the time constant of the thermocouple. A mathematical transformation is used to convert the internal transient data to the response of the thermocouple for an external temperature perturbation.