等离子喷涂镍基合金涂层汽车齿轮轴的摩擦学机理及应用研究
发布时间：2019-02-18 21:04
【摘要】：为保证汽车安全性和可靠性,在易失效的汽车齿轮轴表面等离子喷涂具有较高显微硬度和耐磨性的合金Ni60并渗入Mo/TiB_2、Co、Cr喷涂粉形成耐磨涂层;采用U36的均匀设计方法进行试验设计;在热处理的轴用材料低碳合金钢20CrMoTi表面,运用等离子喷涂技术制备涂层厚度分别为200μm、400μm、600μm的Ni60基Mo、Co、Cr合金涂层,同样在中碳合金钢35CrMo表面制备涂层厚度分别为200μm、400μm、600μm的Ni60基TiB_2、Co、Cr合金涂层;使用HV-1000普及型硬度计对涂层进行显微硬度测量;应用M-200磨损试验机对涂层表面进行磨损试验,试验条件:15#机油润滑、加载F=10N、磨损时间T=100min(20min/次)、低速200rad/min;利用SEM和EDS对涂层剖面及磨损表面进行组织形貌和元素分析;选用人工神经网络方法对试验结果进行仿真、优化、预测和分析,依据预测结果进行验证试验。研究结果表明:Ni60基Mo/TiB_2、Co、Cr合金涂层在涂层厚度分别为200μm、400μm、600μm时,显微硬度分别在716.2HV-1577HV/915HV-1497.3HV、857.8HV-1661.6HV/799.4HV-1322.9HV、688.1HV-1234HV/773.6HV-955.9HV内,磨损量分别在0.0027g-0.0282g/0.0024g-0.0919g、0.0024g-0.0273g/0.0039g-0.0603g、0.0043g-0.0571g/0.0043g-0.0571g内;对比20CrMoTi/35CrMo 2种基体的显微硬度372HV/481HV和磨损量0.0226g/0.0358g,Ni60基Mo/TiB_2、Co、Cr合金涂层显微硬度分别是基体的1.9-4倍/1.9-3.1倍、2.3-4.4倍/1.6-2.1倍、1.8-3.3倍/1.6-1.9倍,耐磨性分别是基体的0.8-8倍/0.4-14倍、0.8-9倍/0.6-9倍、0.9-2.6倍/0.6-8倍;Ni60基Mo/TiB_2、Co、Cr合金涂层在涂层厚度为400μm/200μm时具有较好综合性能;2种涂层都呈层状结构分布且与20CrMoTi/35CrMo结合良好,涂层的磨损机理都主要是粘着磨损、表面疲劳磨损及磨粒磨损;喷涂中形成的氧化物、碳化物和金属钝化物能有效的提高涂层的综合性能。将验证试验结果和人工神经网络的理论预测值对比:涂层厚度为400μm的Ni60基Mo、Co、Cr合金涂层的显微硬度误差在20%内,磨损误差在15%内;涂层厚度为200μm的Ni60基TiB_2、Co、Cr合金涂层的显微硬度误差在11%内,磨损误差在12%内;2种涂层的实际测量值和预测值的相对误差均在允许范围内,因此可用人工神经网络来提供Ni60基合金涂层中元素配比与涂层显微硬度和磨损量间关系的规律集,建立三元回归方程,然后运用回归方程推选出具有实际需要的且综合性能较好的Ni60基Mo/TiB_2、Co、Cr合金涂层,这对于节能环保、提高汽车齿轮轴的寿命、保证行车安全具有非常重要的意义。
[Abstract]:In order to ensure the safety and reliability of automobile, plasma sprayed alloy Ni60 with high microhardness and wear resistance on the surface of automobile gear shaft which is easy to fail and seep into Mo/TiB_2,Co,Cr spray powder to form wear-resistant coating. U36 uniform design method is used to carry out the experimental design. On the 20CrMoTi surface of heat-treated low carbon alloy steel, the plasma spraying technique was used to prepare Ni60 based Mo,Co,Cr alloy coating with the thickness of 200 渭 m or 400 渭 m or 600 渭 m, respectively, and the thickness of the coating on the 35CrMo surface of medium carbon alloy steel was 200 渭 m, respectively. 400 渭 m or 600 渭 m Ni60 based TiB_2,Co,Cr alloy coating; The microhardness of the coating was measured by HV-1000 hardness meter. The wear test was carried out on the coating surface by using M-200 wear test machine. The test conditions were as follows: 15 # oil lubricated, F10 N loaded, wear time T=100min (20min/ times), low speed 200rad/ min; SEM and EDS were used to analyze the microstructure and elements of the coating profile and wear surface, and artificial neural network method was used to simulate, optimize, predict and analyze the experimental results. The results show that the microhardness of Ni60 based Mo/TiB_2,Co,Cr alloy coating is 716.2HV-1577HV/ 915HV-1497.3HVV / 857.8HV-1661.6HV-799.4HV-1322.9HVwhen the coating thickness is 200 渭 m / 400 渭 m / 600 渭 m, respectively, the microhardness of the coating is 716.2HV-1577HV- / 915HV-1497.3HVV / 799.4HV-1322.9HV. In 688.1HV-1234HV/773.6HV-955.9HV, the wear rate was 0.0027g-0.0282g / 0.0024g-0.0919g / 0.0024g-0.0273g / 0.0039g-0.0603g / 0.0043g-0.0571g / 0.0043g-0.0571g respectively. Comparing the microhardness 372HV/481HV and wear amount of 0.0226g / 0.0358g / Ni60-based Mo/TiB_2,Co,Cr alloy coating with 20CrMoTi/35CrMo, the microhardness of the coating is 1.9-4 times / 1.9-3.1 times of that of the substrate, respectively. 2.3-4.4 times / 1.6-2.1 times, 1.8-3.3 times / 1.6-1.9 times, wear resistance is 0.8-8 times / 0.4-14 times of matrix, 0.8-9 times / 0.6-9 times of matrix, respectively. 0.9-2.6 times / 0.6-8 fold; The Ni60 based Mo/TiB_2,Co,Cr alloy coating has good comprehensive properties when the thickness of the coating is 400 渭 m / 200 渭 m. The two kinds of coatings were layered and bonded well with 20CrMoTi/35CrMo. The wear mechanism of the coatings was mainly adhesive wear, surface fatigue wear and abrasive wear. Oxides, carbides and metal passivates formed in spraying can effectively improve the comprehensive properties of the coatings. The experimental results are compared with the theoretical prediction values of artificial neural network. The microhardness error and wear error of Ni60 based Mo,Co,Cr alloy coating with thickness of 400 渭 m are within 20% and 15% respectively. The microhardness error and wear error of Ni60 based TiB_2,Co,Cr alloy coating with thickness of 200 渭 m are within 11% and 12% respectively. The relative errors of the actual measured and predicted values of the two coatings are within the allowable range, so artificial neural networks can be used to provide the rule set of the relationship between the element ratio in the Ni60 base alloy coating and the microhardness and wear quantity of the coating. The ternary regression equation was established, and then the Ni60 base Mo/TiB_2,Co,Cr alloy coating with practical needs and better comprehensive performance was selected by using the regression equation, which can save energy and environmental protection and improve the life of automobile gear shaft. It is very important to ensure traffic safety.
【学位授予单位】：沈阳理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH117;U467
本文编号：2426209
[Abstract]:In order to ensure the safety and reliability of automobile, plasma sprayed alloy Ni60 with high microhardness and wear resistance on the surface of automobile gear shaft which is easy to fail and seep into Mo/TiB_2,Co,Cr spray powder to form wear-resistant coating. U36 uniform design method is used to carry out the experimental design. On the 20CrMoTi surface of heat-treated low carbon alloy steel, the plasma spraying technique was used to prepare Ni60 based Mo,Co,Cr alloy coating with the thickness of 200 渭 m or 400 渭 m or 600 渭 m, respectively, and the thickness of the coating on the 35CrMo surface of medium carbon alloy steel was 200 渭 m, respectively. 400 渭 m or 600 渭 m Ni60 based TiB_2,Co,Cr alloy coating; The microhardness of the coating was measured by HV-1000 hardness meter. The wear test was carried out on the coating surface by using M-200 wear test machine. The test conditions were as follows: 15 # oil lubricated, F10 N loaded, wear time T=100min (20min/ times), low speed 200rad/ min; SEM and EDS were used to analyze the microstructure and elements of the coating profile and wear surface, and artificial neural network method was used to simulate, optimize, predict and analyze the experimental results. The results show that the microhardness of Ni60 based Mo/TiB_2,Co,Cr alloy coating is 716.2HV-1577HV/ 915HV-1497.3HVV / 857.8HV-1661.6HV-799.4HV-1322.9HVwhen the coating thickness is 200 渭 m / 400 渭 m / 600 渭 m, respectively, the microhardness of the coating is 716.2HV-1577HV- / 915HV-1497.3HVV / 799.4HV-1322.9HV. In 688.1HV-1234HV/773.6HV-955.9HV, the wear rate was 0.0027g-0.0282g / 0.0024g-0.0919g / 0.0024g-0.0273g / 0.0039g-0.0603g / 0.0043g-0.0571g / 0.0043g-0.0571g respectively. Comparing the microhardness 372HV/481HV and wear amount of 0.0226g / 0.0358g / Ni60-based Mo/TiB_2,Co,Cr alloy coating with 20CrMoTi/35CrMo, the microhardness of the coating is 1.9-4 times / 1.9-3.1 times of that of the substrate, respectively. 2.3-4.4 times / 1.6-2.1 times, 1.8-3.3 times / 1.6-1.9 times, wear resistance is 0.8-8 times / 0.4-14 times of matrix, 0.8-9 times / 0.6-9 times of matrix, respectively. 0.9-2.6 times / 0.6-8 fold; The Ni60 based Mo/TiB_2,Co,Cr alloy coating has good comprehensive properties when the thickness of the coating is 400 渭 m / 200 渭 m. The two kinds of coatings were layered and bonded well with 20CrMoTi/35CrMo. The wear mechanism of the coatings was mainly adhesive wear, surface fatigue wear and abrasive wear. Oxides, carbides and metal passivates formed in spraying can effectively improve the comprehensive properties of the coatings. The experimental results are compared with the theoretical prediction values of artificial neural network. The microhardness error and wear error of Ni60 based Mo,Co,Cr alloy coating with thickness of 400 渭 m are within 20% and 15% respectively. The microhardness error and wear error of Ni60 based TiB_2,Co,Cr alloy coating with thickness of 200 渭 m are within 11% and 12% respectively. The relative errors of the actual measured and predicted values of the two coatings are within the allowable range, so artificial neural networks can be used to provide the rule set of the relationship between the element ratio in the Ni60 base alloy coating and the microhardness and wear quantity of the coating. The ternary regression equation was established, and then the Ni60 base Mo/TiB_2,Co,Cr alloy coating with practical needs and better comprehensive performance was selected by using the regression equation, which can save energy and environmental protection and improve the life of automobile gear shaft. It is very important to ensure traffic safety.
【学位授予单位】：沈阳理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH117;U467
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