碳钢表面PIRAC法制备碳化铬涂层
发布时间：2019-02-19 09:46
【摘要】：水工金属结构是水利水电工程中重要的组成部分，相关部件的腐蚀或则磨损会严重的影响水利水电工程的安全，因腐蚀和磨损造成金属部件的频繁更换维修和水利机械部件的效率下降对水利工程的经济效益也有非常严重的影响。碳化铬陶瓷具有高硬度、优良的耐磨损性和耐腐蚀性，是目前备受关注的耐磨防腐涂层。粉末埋入反应辅助涂层（PIRAC）能实现低成本在复杂形状部件表面制备结合良好的涂层。 本文首先采用热力学分析，确定了PIRAC法制备碳化铬涂层的反应粉体、温度范围，以及外层容器的包埋粉体；研究了在T/P24钢材基体，不同工艺参数制备碳化铬涂层的微观形貌、物相、氧化行为，确定了最佳制备条件；对比研究了T/P24钢材和Q235钢材2种基体对制备出的涂层微观形貌、物相、硬度、及摩擦行为的影响。主要研究内容和结果如下： 1.通过热力学分析研究了合适的反应粉体、外层包埋粉体和反应温度范围。得出：适合的反应粉体为铬粉，外层包埋的粉体为钛粉，制备温度范围为：800oC-1050oC。 2.研究了不同的处理温度和处理时间在T/P24钢材基体表面制备的碳化铬涂层的异同。实验表明在T/P24钢材表面能够制备出均匀致密的碳化铬涂层；反应温度和时间不同，涂层的形貌和物相不同；较低的温度和较短的时间下，涂层中包含Cr23C6，Cr7C3和Cr3C2三种物相，并且温度越低Cr7C3和Cr3C2的含量也越高，然而在较高的温度或则较长的时间条件下，涂层基本上只含有Cr23C6一种物相。 3.通过氧化实验比较了不同制备温度和不同的处理时间下碳化铬涂层的抗氧化性能。确定最佳的制备工艺为900oC下处理4h。 4.研究了T/P24和Q235两种基体对制备的碳化铬涂层组成、形貌和硬度的影响。结果表明：2种基体表面的涂层组成无明显差异，900oC制备的涂层则基本为单一的Cr23C6；涂层形貌有明显差异，Q235表面制备的涂层较为粗糙，呈均匀的微细颗粒状，含有微小孔洞，而T/P24表面制备的涂层光滑平整；涂层硬度不同，Q235表面制备的碳化铬涂层的硬度均高于T/P24表面制备的碳化铬涂层的硬度。 5.研究了两种基体表面制得的涂层的摩擦行为。实验表明：2种基体表面的碳化铬涂层摩擦行为有所不同：Q235表面制备的碳化铬涂层摩擦系数比T/P24表面的碳化铬涂层摩擦系数低，Q235表面的碳化铬涂层耐磨性能相对较高。
[Abstract]:The hydraulic structure of the hydraulic structure is an important part of the water conservancy and hydropower project, and the corrosion of the related components or the wear can seriously affect the safety of the water conservancy and hydropower project. The frequent replacement and maintenance of the metal parts due to corrosion and wear and the efficiency of the water conservancy machinery part have a very serious effect on the economic benefit of the water conservancy project. The chromium carbide ceramic has high hardness, excellent wear resistance and corrosion resistance, and is a wear-resistant and anti-corrosion coating which is currently being paid attention to. The powder-embedded reaction-assisted coating (PIRAC) enables low-cost preparation of a well-bonded coating on the surface of a complex-shaped component. In this paper, the thermodynamic analysis is used to determine the reaction powder, the temperature range and the embedding powder of the carbon-carbide coating prepared by the PIRAC method. The microstructure, phase and oxidation of the chromium-free coatings on the T/ P24 steel matrix and different process parameters are studied. In this paper, the best preparation conditions were determined. The microstructure, phase, hardness and friction behavior of two kinds of matrix of T/ P24 steel and Q235 steel were compared. in response to that main study and results such as The appropriate reaction powder, the outer layer of embedded powder and the reaction temperature were studied by the thermodynamic analysis. The suitable reaction powder is chromium powder, and the outer layer is embedded with titanium powder, and the preparation temperature range is 800oC-105. 0oC. 2. Study on the different treatment temperature and the treatment time of chromium carbide prepared on the surface of T/ P24 steel substrate The results show that the uniform and dense chromium carbide coating can be prepared on the surface of T/ P24 steel. The temperature and time of the reaction are different. The appearance and phase of the coating are different. The coating contains Cr23C6, Cr7C3 and Cr3C at lower temperature and shorter time. The higher the content of the three species, and the lower the temperature, the lower the Cr7C3 and Cr3C2, however, the coating essentially only contains Cr23C at a higher temperature or at a longer time. 6 An object phase. 3. The chromium carbide coating at different preparation temperatures and different treatment times was compared by the oxidation experiment. the anti-oxidation performance of the layer is determined, and the optimal preparation process is 900. The composition of chromium carbide coatings prepared by T/ P24 and Q235 substrates was studied at oC. The results show that there is no significant difference in the coating composition of the surface of the two substrates. The coating on the surface of 900oC is basically a single Cr23C6; the morphology of the coating is obviously different. The coating prepared on the surface of the Q235 is rough and has a uniform fine grain shape, which contains tiny holes, and the surface of the T/ P24 The prepared coating is smooth and flat; the hardness of the coating is different, and the hardness of the chromium carbide coating prepared on the surface of the Q235 is higher than that of the T/ P24 surface The hardness of the chromium carbide coating was 5. Two basic body surfaces were studied. The experimental results show that the friction behavior of the chromium carbide coating on the surface of the two substrates is different: the friction coefficient of the chromium carbide coating prepared on the surface of the Q235 is lower than that of the chromium carbide coating on the surface of the T/ P24, and the carbonization of the surface of the Q235
【学位授予单位】：西北农林科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV34
本文编号：2426386
[Abstract]:The hydraulic structure of the hydraulic structure is an important part of the water conservancy and hydropower project, and the corrosion of the related components or the wear can seriously affect the safety of the water conservancy and hydropower project. The frequent replacement and maintenance of the metal parts due to corrosion and wear and the efficiency of the water conservancy machinery part have a very serious effect on the economic benefit of the water conservancy project. The chromium carbide ceramic has high hardness, excellent wear resistance and corrosion resistance, and is a wear-resistant and anti-corrosion coating which is currently being paid attention to. The powder-embedded reaction-assisted coating (PIRAC) enables low-cost preparation of a well-bonded coating on the surface of a complex-shaped component. In this paper, the thermodynamic analysis is used to determine the reaction powder, the temperature range and the embedding powder of the carbon-carbide coating prepared by the PIRAC method. The microstructure, phase and oxidation of the chromium-free coatings on the T/ P24 steel matrix and different process parameters are studied. In this paper, the best preparation conditions were determined. The microstructure, phase, hardness and friction behavior of two kinds of matrix of T/ P24 steel and Q235 steel were compared. in response to that main study and results such as The appropriate reaction powder, the outer layer of embedded powder and the reaction temperature were studied by the thermodynamic analysis. The suitable reaction powder is chromium powder, and the outer layer is embedded with titanium powder, and the preparation temperature range is 800oC-105. 0oC. 2. Study on the different treatment temperature and the treatment time of chromium carbide prepared on the surface of T/ P24 steel substrate The results show that the uniform and dense chromium carbide coating can be prepared on the surface of T/ P24 steel. The temperature and time of the reaction are different. The appearance and phase of the coating are different. The coating contains Cr23C6, Cr7C3 and Cr3C at lower temperature and shorter time. The higher the content of the three species, and the lower the temperature, the lower the Cr7C3 and Cr3C2, however, the coating essentially only contains Cr23C at a higher temperature or at a longer time. 6 An object phase. 3. The chromium carbide coating at different preparation temperatures and different treatment times was compared by the oxidation experiment. the anti-oxidation performance of the layer is determined, and the optimal preparation process is 900. The composition of chromium carbide coatings prepared by T/ P24 and Q235 substrates was studied at oC. The results show that there is no significant difference in the coating composition of the surface of the two substrates. The coating on the surface of 900oC is basically a single Cr23C6; the morphology of the coating is obviously different. The coating prepared on the surface of the Q235 is rough and has a uniform fine grain shape, which contains tiny holes, and the surface of the T/ P24 The prepared coating is smooth and flat; the hardness of the coating is different, and the hardness of the chromium carbide coating prepared on the surface of the Q235 is higher than that of the T/ P24 surface The hardness of the chromium carbide coating was 5. Two basic body surfaces were studied. The experimental results show that the friction behavior of the chromium carbide coating on the surface of the two substrates is different: the friction coefficient of the chromium carbide coating prepared on the surface of the Q235 is lower than that of the chromium carbide coating on the surface of the T/ P24, and the carbonization of the surface of the Q235
【学位授予单位】：西北农林科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV34
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相关期刊论文 前2条
1 董洪亮;李国军;崔学军;;高性能陶瓷涂层的制备技术与发展趋势[J];材料导报;2008年S2期
2 陈琳,张三平,周学杰;热喷涂涂层孔隙率的降低方法[J];热加工工艺;2004年02期
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