摘要
为了解决盾构施工的泥饼问题,利用火焰喷涂在Q345钢板表面制备了石墨-镍涂层,通过摩擦磨损试验分析了涂层和无涂层试样与泥岩渣土的摩擦行为,研究了石墨-镍涂层对摩擦系数、表面磨损量和表面磨痕的影响。结果表明,干摩擦条件下,泥岩渣土与无涂层表面和涂层表面的摩擦系数分别为0.4和0.3;湿摩擦条件下,泥岩渣土与无涂层表面和涂层表面的摩擦系数分别为0.25和0.05。随着载荷从50 g增加到500 g,湿摩擦条件下涂层表面磨损量增加缓慢,干摩擦条件下涂层表面磨损量呈台阶式增加;在干摩擦条件下,随载荷增加,磨痕宽度和深度增加,局部出现犁沟形态。现场试验结果证实,滚刀刀桶端面火焰喷涂石墨-镍涂层能够有效抑制盾构在泥岩地质层施工过程中的刀盘结泥现象。
The graphite-nickel coatings on the surface of Q345 steel plates were prepared by flame spraying to solve the mud-caking problems of shield tunneling.The friction behaviors of Q345 steel samples with and without graphite-nickel coatings against mudstone compacts were analyzed by friction-wear tests,and the influences of graphite-nickel coatings on the friction coefficient,wear loss,wear scars were systemically studied.The results show that,the dry-friction coefficients of Q345 steel samples with and without graphite-nickel coatings against mudstone compacts are 0.4 and 0.3,respectively,and the wet-friction coefficients are 0.25 and 0.05,respectively.As the load increasing from 50 to 500 g,the wear loss of samples with coating increases slowly under the wet friction condition;while it takes a step-change upward under the dry friction condition.Under the dry friction condition,both width and depth of wear scar increase as increasing the load,and the furrows occur locally.The in-situ testing proves that the flame sprayed graphite-nickel coatings on the end surfaces of disc cutter barrels can effectively inhibit the mud-caking phenomena during shield tunneling in mudstone layers.
作者
赵兴科
王志华
唐荣华
魏林春
ZHAO Xing-ke;WANG Zhi-hua;TANG Rong-hua;WEI Lin-chun(School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China;Shanghai Tunnel Engineering Co.,Ltd.,Shanghai 200032,China)
出处
《粉末冶金技术》
CAS
CSCD
北大核心
2019年第2期112-117,共6页
Powder Metallurgy Technology
关键词
涂层
泥岩
摩擦
磨损
盾构施工
coatings
mudstone
friction
wear
shield tunneling
