發(fā)布時間：2018-06-04 07:42

  本文選題：涂層性能 + 超聲檢測��； 參考：《北京理工大學(xué)》2015年碩士論文

【摘要】：隨著各類涂層技術(shù)的發(fā)展及其應(yīng)用,為了避免或減少因其失效對基底造成的破壞和損失,涂層性能的檢測與評價方法越來越受到研究人員的重視。超聲無損檢測技術(shù)能實現(xiàn)非破壞性、自動化檢測,且具有檢測過程簡單、效率高的優(yōu)點,使其能成為涂層性能檢測的有效手段。本文主要在掌握涂層聲學(xué)特性及超聲波在其中傳播規(guī)律的基礎(chǔ)上,研究利用超聲法對涂層性能檢測中涂層厚度及其均勻性、涂層結(jié)合質(zhì)量這兩大難題進行無損檢測與表征的方法。對于涂層厚度及其均勻性檢測難題,基于超聲波在涂層中的傳播規(guī)律,提出利用Welch譜估計對涂層厚度進行超聲無損測量的方法,該測量方法結(jié)果與顯微測量法結(jié)果的相對誤差小于6%。在此基礎(chǔ)之上,利用C#與Matlab混合編程技術(shù)將該厚度算法融入到超聲顯微系統(tǒng)的C掃功能中,通過離散的顏色值來表示涂層的厚度,實現(xiàn)涂層厚度分布的C掃成像,并通過對圖像的分析達到對厚度均勻性進行無損評估的目的。涂層結(jié)合質(zhì)量檢測與表征難題主要包含涂層結(jié)合缺陷檢測、涂層結(jié)合強度表征兩個方面。對于涂層結(jié)合缺陷,采用底面回波反射法實現(xiàn)對人工制造的涂層結(jié)合界面缺陷進行檢測。對于涂層結(jié)合強度,利用底面回波反射技術(shù)及非線性超聲技術(shù)測量對涂層結(jié)合強度敏感的超聲特征參數(shù),建立并分析所選擇特征參數(shù)與力學(xué)法測量得到的結(jié)合強度的關(guān)系,實現(xiàn)涂層結(jié)合強度的超聲無損表征。
[Abstract]:With the development and application of all kinds of coating technology, in order to avoid or reduce the damage and loss caused by its failure on the substrate, more and more researchers pay attention to the testing and evaluation methods of coating performance. Ultrasonic nondestructive testing (NDT) technology can realize non-destructive, automatic testing, and has the advantages of simple testing process and high efficiency, which makes it an effective means of coating performance testing. On the basis of mastering the acoustic characteristics of the coating and the law of ultrasonic propagation in the coating, the thickness and uniformity of the coating are studied by using the ultrasonic method. Methods of nondestructive testing and characterization of coating bonding quality. For the difficult problem of measuring coating thickness and its uniformity, based on the propagation rule of ultrasonic wave in coating, a method of ultrasonic nondestructive measurement of coating thickness using Welch spectrum estimation is put forward. The relative error between the results of this method and that of microscopic measurement is less than 6. On this basis, the thickness algorithm is integrated into the C scan function of ultrasonic microscopy system by C # and Matlab mixed programming technology. The thickness of the coating is expressed by discrete color values, and the C scan imaging of the thickness distribution of the coating is realized. The non-destructive assessment of thickness uniformity is achieved by image analysis. The problems of coating bonding quality testing and characterization mainly include coating bonding defect detection and coating bonding strength characterization. For coating bonding defects, the bottom echo reflection method is used to detect the artificial coating bonding interface defects. For coating bonding strength, ultrasonic characteristic parameters sensitive to coating bonding strength are measured by bottom echo reflection technique and nonlinear ultrasonic technique, and the relationship between the selected characteristic parameters and the bond strength measured by mechanical method is established and analyzed. The ultrasonic nondestructive characterization of the bonding strength of the coating was realized.
【學(xué)位授予單位】：北京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB302.5

【共引文獻】

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