本文選題：發(fā)射率 + 氧化和氮化��； 參考：《河南師范大學(xué)》2017年碩士論文

【摘要】：發(fā)射率是物體的熱物性參數(shù)之一,是描述物體的熱輻射特性的重要參數(shù),在航空、航天、科學(xué)研究,國防和工農(nóng)業(yè)生產(chǎn)等領(lǐng)域中具有重要的應(yīng)用價值和研究意義,其測量精度水平、大小控制、變化特征控制是測量各種相關(guān)產(chǎn)品質(zhì)量的重要技術(shù)指標,發(fā)射率的測量在紅外測量技術(shù)中占據(jù)著重要地位。發(fā)射率的測量受波長、溫度、發(fā)射角、表面粗糙程度、表面氧化程度、是否有污染物以及樣品成分的影響,發(fā)射率很難精確測量。在表面狀態(tài)不同時,測量發(fā)射率隨波長和溫度的變化就更難了。尤其是樣品表面長時間被空氣氧化,測量發(fā)射率隨波長和溫度的變化可能就變得更加復(fù)雜。在本文中我們詳細探究了在波長為1.5μm時,鈦和鈦合金在800-1100K的溫度范圍內(nèi)發(fā)射率隨著溫度和加熱時間的變化,討論了樣品表面氧化和氮化對發(fā)射率的影響,在1.4-2.1μm的波長范圍和800-1100K的溫度范圍內(nèi),為了精確預(yù)測不銹鋼304的溫度,測試了九種發(fā)射率模型。鈦TA2和鈦合金Ti-6Al-4V由于高拉伸強度和高強度重量比,耐熱,耐腐蝕性能和低密度的優(yōu)勢,廣泛應(yīng)用在航空航天、汽車、國防、醫(yī)療和化工行業(yè)等各個領(lǐng)域。在所有的應(yīng)用中,鈦TA2和鈦合金Ti-6Al-4V的發(fā)射率都是一個關(guān)鍵參數(shù)。毫不夸張地說,鈦TA2和鈦合金Ti-6Al-4V的發(fā)射率的測量和估值已經(jīng)成為一些應(yīng)用中的重要挑戰(zhàn)。例如,在航空和飛機構(gòu)件,發(fā)射率的值必須是在傳熱時進行計算。用鈦合金Ti-6Al-4V制作航空和飛機的部件時,經(jīng)常涉及高溫過程,甚至是在融化狀態(tài)。此時,在無觸頭溫度測量的過程中發(fā)射率是正確測量溫度的一個基本參數(shù);在校準檢驗激光金屬沉積過程模型中,光譜發(fā)射率也是必要的。然而,鈦TA2和鈦合金Ti-6Al-4V的發(fā)射率值相當缺乏,只存在于少數(shù)文獻報告中。在文章的前一部分,我們主要補充了鈦TA2及鈦合金Ti-6Al-4V的發(fā)射率數(shù)值。輻射測溫可以分為單波長測溫法和多譜線輻射測溫法。利用單波長測溫法時,為了能精確的測量溫度,我們必須知道樣品準確的光譜發(fā)射率。利用多譜線輻射測溫法時,我們對光譜發(fā)射率、波長、溫度都必須有充足的知識儲備。我們已經(jīng)分析過許多實驗來研究不銹鋼鋼表面氧化層增長所引起的光譜發(fā)射率的變化。我們早期的論文指出,不銹鋼表面氧化能很大程度上影響光譜發(fā)射率并帶來明顯的溫度測量誤差。溫度測量的精確度很大程度上依賴于多譜線輻射測溫法所確定的發(fā)射率模型。表面氧化是否影響光譜發(fā)射率模型?在本文中我們將回答這個問題。最后,通過對實驗所得數(shù)據(jù)的對比分析,我們對鈦TA2、鈦合金Ti-6Al-4V及不銹鋼304的發(fā)射率值進行了補充,得出了許多重要的結(jié)論,對工業(yè)生產(chǎn)和應(yīng)用具有重要意義。
[Abstract]:Emissivity is one of the thermal physical parameters of objects, and it is an important parameter to describe the thermal radiation characteristics of objects. It has important application value and research significance in the fields of aviation, aerospace, scientific research, national defense and industrial and agricultural production, etc. The measurement accuracy level, size control and variation feature control are important technical indexes for measuring the quality of various related products. Emissivity measurement plays an important role in infrared measurement technology. The emissivity measurement is difficult to accurately measure because of the influence of wavelength, temperature, emission angle, surface roughness, surface oxidation, contaminants and sample composition. At different surface states, it is more difficult to measure emissivity with wavelength and temperature. Especially when the surface of the sample is oxidized by air for a long time, the change of emissivity with wavelength and temperature may become more complicated. In this paper, we have studied the change of emissivity of titanium and titanium alloy with temperature and heating time in the temperature range of 800-1100K at the wavelength of 1.5 渭 m. The effects of surface oxidation and nitridation on the emissivity are discussed. Nine emissivity models were tested in the wavelength range of 1.4-2.1 渭 m and the temperature range of 800-1100K in order to accurately predict the temperature of 304 stainless steel. Titanium TA2 and titanium alloy Ti-6Al-4V are widely used in aerospace, automobile, national defense, medical and chemical industry due to their advantages of high tensile strength and high strength to weight ratio, heat resistance, corrosion resistance and low density. The emissivity of titanium TA2 and titanium alloy Ti-6Al-4V is a key parameter in all applications. It is no exaggeration to say that the measurement and estimation of emissivity of titanium TA2 and titanium alloy Ti-6Al-4V have become important challenges in some applications. For example, in aeronautical and aircraft components, the emissivity must be calculated during heat transfer. Titanium alloy Ti-6Al-4V often involves high temperature processes, even melting state, in the manufacture of aircraft and aeronautical components. In this case, emissivity is a basic parameter for measuring temperature correctly in the process of non-contact temperature measurement, and spectral emissivity is also necessary in calibrating the model of laser metal deposition process. However, the emissivity values of titanium TA2 and titanium alloy Ti-6Al-4V are rather short, and are only reported in a few literatures. In the first part of this paper, we mainly supplement the emissivity of titanium TA2 and titanium alloy Ti-6Al-4V. Radiation temperature measurement can be divided into single wavelength temperature measurement method and multi-spectral line radiation temperature measurement method. In order to measure the temperature accurately, we must know the accurate spectral emissivity of the sample. We must have sufficient knowledge of spectral emissivity, wavelength and temperature when using multi-line radiometric temperature measurement. We have analyzed many experiments to study the variation of spectral emissivity due to the growth of oxidation layer on the surface of stainless steel. It is pointed out in our earlier paper that the surface oxidation of stainless steel can greatly affect the spectral emissivity and bring about obvious temperature measurement errors. The accuracy of temperature measurement depends largely on the emissivity model determined by multi-spectral line radiometry. Does surface oxidation affect the spectral emissivity model? We will answer this question in this article. Finally, the emissivity values of titanium TA2, titanium alloy Ti-6Al-4V and stainless steel 304 are supplemented by comparing and analyzing the experimental data, and many important conclusions are drawn, which are of great significance for industrial production and application.
【學(xué)位授予單位】：河南師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG115.2

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