發(fā)布時間：2018-11-17 11:55

【摘要】：隨著科學(xué)技術(shù)的發(fā)展,工程設(shè)備及構(gòu)件的工作條件日益苛刻,傳統(tǒng)材料難以滿足工程需求。陶瓷涂層因具有耐高溫、耐腐蝕、耐氧化、高強(qiáng)度等優(yōu)越性能得到越來越廣泛地應(yīng)用。對于陶瓷涂層而言,涂層殘余應(yīng)力與界面結(jié)合強(qiáng)度是決定其工程使用安全可靠性的重要性能指標(biāo),但它們卻常常難以準(zhǔn)確評價。針對陶瓷涂層殘余應(yīng)力難以測試的現(xiàn)狀,本研究采用相對法理論,分別建立了對同溫涂層與異溫涂層的殘余應(yīng)力評價方法,其中,同溫涂層為制備時涂層與基體材料處于相同溫度的涂層,如CVD涂層;異溫涂層為制備時涂層與基體材料處于不同溫度的涂層,如熱噴涂涂層。另一方面,對于陶瓷涂層界面結(jié)合強(qiáng)度評價,本研究提出改進(jìn)十字交叉法測試界面結(jié)合強(qiáng)度,并結(jié)合相對法對界面破壞形式進(jìn)行了分析。1.針對陶瓷同溫涂層殘余應(yīng)力評價難題,基于均勻應(yīng)變模型和相對法理論,根據(jù)材料的幾何相容性與受力平衡原理,建立了同溫涂層殘余應(yīng)力評價方程,通過測量涂層與基體的彈性模量、熱膨脹系數(shù)、橫截面積與等效溫度即可算出同溫涂層殘余應(yīng)力。2.對于陶瓷異溫涂層,當(dāng)樣品為單面涂層并產(chǎn)生彎曲變形時,可采用經(jīng)典的Stoney公式測試曲率計算殘余應(yīng)力,定義這類樣品為Stoney型涂層,否則為非Stoney型涂層。工程中大量的涂層構(gòu)件不發(fā)生彎曲變形,均屬于非Stoney型涂層,這類涂層殘余應(yīng)力評價是陶瓷涂層領(lǐng)域的關(guān)鍵。本研究采用相對法理論建立Stoney型涂層和非Stoney型涂層的殘余應(yīng)力之間的解析關(guān)系,Stoney型涂層的殘余應(yīng)力可通過Stoney公式測試,從而使得非Stoney型涂層的殘余應(yīng)力可通過其關(guān)系式計算出來。3.針對陶瓷涂層界面結(jié)合強(qiáng)度評價,采用十字交叉法并改進(jìn)樣品制備要求,確保在十字交叉法剪切測試時,界面受到的是純剪切力,避免彎矩的產(chǎn)生,同時使得界面剪切強(qiáng)度測試不再受到粘結(jié)劑強(qiáng)度的限制;通過對十字交叉夾具的修正,避免了在涂層拉伸強(qiáng)度測試過程中摩擦力的產(chǎn)生,提高了測量結(jié)果的準(zhǔn)確性。
[Abstract]:With the development of science and technology, the working conditions of engineering equipment and components are increasingly harsh. Ceramic coatings are more and more widely used because of their excellent properties such as high temperature resistance, corrosion resistance, oxidation resistance and high strength. For ceramic coatings, the residual stress and interface bonding strength are important performance indexes to determine the safety and reliability of the coatings, but they are often difficult to evaluate accurately. In view of the present situation that the residual stress of ceramic coating is difficult to be measured, the method of evaluating residual stress of the same temperature coating and the different temperature coating is established by using the theory of relative method. The same temperature coating is the coating at the same temperature as the substrate material, such as CVD coating. Heterothermic coating is a kind of coating, such as thermal spraying coating, when the coating and substrate material are at different temperatures. On the other hand, for the evaluation of the interface bonding strength of ceramic coatings, an improved cross method is proposed to test the interface bond strength, and the failure mode of the interface is analyzed in combination with the relative method. 1. Based on the uniform strain model and the theory of relative method, the residual stress evaluation equation of the same temperature coating is established according to the principle of geometric compatibility and stress balance of the ceramic coating at the same temperature. By measuring the elastic modulus, coefficient of thermal expansion, cross-sectional area and equivalent temperature of the coating and substrate, the residual stress of the coating at the same temperature can be calculated. When the sample is a single-sided coating and bending deformation occurs, the residual stress can be calculated by using the classical Stoney formula to measure the curvature of the coatings. The samples are defined as Stoney coatings, otherwise they are non-Stoney coatings. A large number of coating components do not bend and deform in engineering, all of them belong to non-Stoney coating. The residual stress evaluation of this kind of coating is the key in the field of ceramic coating. In this study, the analytical relationship between residual stress of Stoney coating and non-Stoney coating is established by using the relative method theory. The residual stress of Stoney coating can be measured by Stoney formula. Thus, the residual stress of non Stoney coating can be calculated by its relationship. According to the evaluation of the bonding strength of ceramic coating interface, the cross method is adopted and the sample preparation requirements are improved to ensure that the interface is subjected to pure shear force during the cross shear test, so as to avoid the generation of bending moment. At the same time, the interfacial shear strength testing is no longer limited by the bond strength. By modifying the cross clamp, the friction force is avoided during the tensile strength test of the coating, and the accuracy of the measurement results is improved.
【學(xué)位授予單位】：中國建筑材料科學(xué)研究總院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG174.453

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