摘要
电爆炸喷涂可用于零件内孔耐磨涂层的制备,涂层具有光滑致密、孔隙率低、结合强度高的特点。通过对空气中进行电爆炸金属丝制备表面涂层时冲击波传播规律的研究,运用量纲分析的方法建立了计算电爆炸冲击波传播规律的工程模型,并对冲击波对喷涂过程的影响进行了分析,提出了可以估算冲击波位置、压力、传播速度以及波后物质速度的计算公式。结果表明:沉积能量线密度越高,冲击波的波阵面压力越大、传播速度越快、波后物质速度越高、到达同样喷涂距离时间越短。
The wire explosion spraying is a new surface engineering technology in the wear-resistance or anti-corrosion coating preparation of in-hole parts. The spraying coating enjoys smooth surface, low porosity, high bonding strength and other good features. The shock waves in wire explosion spraying greatly influence molten drop＇s velocity, enthalpy, deposition process and coating＇s composition, as well as the spraying effect. This paper carries out a theoretical study on shock waves in wire explosion spraying in air. A model of shock waves is build and influencing factors of shock waves on wire explosion spraying process are analyzed with spraying current exceeding 107 A/mmE. Based on this model and through dimensional analysis, the shock waves propagation law is deduced. The empirical formulas for linear density of energy deposition and for wavefront＇s displacement, pressure, propagation velocity, material velocity behind shock waves are obtained. The results show that if the li^near density of energy deposition increases, the shock waves＂ pressure, propagation velocity and material velocity behind shock waves will also increase. An appropriate spraying distance from wire to substrate surface is important, which has great influence on the spraying effect. These results provide some guidance to the wire explosion spraying process.
出处
《科技导报》
CAS
CSCD
北大核心
2009年第5期52-55,共4页
Science & Technology Review
基金
国防预研项目(40404060104)
关键词
电爆炸喷涂
冲击波
量纲分析
exploding spraying
shockwaves
dimensional analysis
