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为实现用碳化钨粉末作为喷涂材料制备电爆喷涂涂层,开发了一种连续送粉的管内约束电爆喷涂方法,试验研究了初始电压及喷涂距离对涂层特性的影响。结果表明:在一定的喷涂距离范围内,这种方法可以使碳化钨颗粒全部以熔融状态形成液相涂层,这类涂层致密度较高,与基体有较高的结合强度,当喷涂距离很小时,如1mm,涂层表面呈现气相沉积的特征。随着喷涂距离的增大,爆炸产物中部分熔融粒子开始凝固成固相颗粒,形成含有固相颗粒的涂层,这种涂层的致密度下降,与基体结合强度较低。随着初始电压的升高,获得液相涂层和含有固相颗粒的涂层的喷涂范围增大。
In order to realize the electrospray coating by using tungsten carbide powder as the coating material, a continuous powder feeding tube-restraint electric blasting method was developed. The influence of initial voltage and spraying distance on the coating properties was studied. The results show that: in a certain range of spraying distance, this method can make all the tungsten carbide particles form a liquid coating in the molten state. Such coatings have higher density and higher bonding strength with the matrix. When the spraying distance At small hours, such as 1 mm, the coating surface is vapor-deposited. With the increase of spray distance, some of the molten particles in the explosive products begin to solidify into solid particles, forming a coating containing solid particles. The density of the coating decreases and the bonding strength with the matrix is low. As the initial voltage increases, the spray range for obtaining the liquid-phase coating and the coating containing the solid-phase particles increases.