Basic Characteristics of Gas Tunnel Type Plasma Jet Torch

Abstract

The analogy between magnetic froth (cellulardomain patterns ingarnet films) and the two-dimensional soap froth is used to develop an elementary model for the former system. Simulations are performed using this model: they have many features in common with recent experimental results and can be further illuminated by simple calculations in the spirit of mean-field theory. An analysis of topological cell statistics is also presented.

Smart coating technology by gas tunnel type plasma spraying

“…Figure 1 shows the gas tunnel type plasma spraying torch. The experimental method to produce the high hardness ceramic coatings by means of the gas tunnel type plasma spraying have been described in the previous papers [4,5,11,12,13].…”

“…Characteristics of gas tunnel type plasma spraying The gas tunnel type plasma spraying can make high quality ceramic coatings compared to conventional plasma spraying systems. The gas tunnel type plasma spraying torch [4,5,11,12,13]is shown in Figure 1. The coating is formed on the substrate traversed at the spraying distance: L. In this case, the gas divertor nozzle diameter was d=20 mm.…”

“…A platinum wire used as the counter electrode was immersed in the reaction cell containing 500ml corrosion media of 0.5M HCl solution. HCl solution was chosen as corrosion media because Cl -ions are assumed passing through the coating layer more easily than another commonly-used anodic oxidant SO 4 .…”

“…The gas tunnel type plasma system developed by the author has high energy density and also high efficiency [1][2][3]. The outline of this plasma system and the applications to the various thermal processing are described briefly in the following chapters.…”

“…The outline of this plasma system and the applications to the various thermal processing are described briefly in the following chapters. One of typical applications is plasma spraying of ceramics such as Al 2 O 3 and ZrO 2 [4]. The characteristics of these ceramic coatings by the gas tunnel type plasma spraying were superior to that by the conventional ones.…”