CN101135035A - Spraying apparatus for preparing ultra-microminiature by arc process - Google Patents

Abstract

The arc process ultramicron spraying equipment as one advanced spraying one has two mutually insulated and sprayed material filaments fed mechanically to an atomized air flow area and applied with 18-40 V voltage across them to ignite electric arc to melt the ends and heat to overheat state, and one air compressing unit to generate powerful compressed airflow to spray and atomize the metal so as to form high speed particle flow in the speed of 200-300 m/s to the treated surface of the workpiece. The high temperature and high speed particle flow impacts the surface of the workpiece to produce deformation, metallurgical reaction and diffusion, forming netted coating after cooling.

Description

Spraying apparatus for preparing ultra-microminiature by arc process

Technical field:

The present invention belongs to the coating metal surfaces field, particularly a kind of device for preparing the ultra micron spraying with arc process.

Background technology:

General at present flame method spraying, the lower and skewness of flame temperature during spraying of adopting. for fully being heated, particle needs restriction particle flight velocity. and this often causes degradation under the coating quality. also need respectively mix the high quality that several good combination and strict control could guarantee coating during the particle spraying.

Summary of the invention:

Electric arc spraying is the method for energy utilization fullest in the heat spraying method, its utilization ratio can reach 57%, and flame wire material spraying is 13%, and 1/15～1/20. electric arc spraying of oxygen, acetylene expense was high-level efficiency, high quality, technology cheaply when the electricity charge when plasma spray is painted with 12%. electric arc sprayings only were equivalent to flame plating.

All particles form through the arc-melting atomizing by the silk material during electric arc spraying, particle obtains fully and uniform heating. the lower and skewness of flame temperature during flame plating, need place restrictions on the particle flight velocity for particle is fully heated, this often causes figure layer downgrade. also need the high quality of each parameter good combination and strict control ability assurance figure layer during plasma spraying.

Embodiment:

Insulated from each other with two, the Spray Wire material that machinery is sent to is sent into the atomization air flow district a bit, pass to 18-40V voltage between the Spray Wire material, the electric arc that ignites makes wire material end heating and melting and reaches superheat state. and intensive pressurized air atomization air flow sprays melt metal, atomizing and in the particulate mode with the high speed impact of 200-300ms-1 to through on the previously prepared workpiece surface, the particle that these temperature are very high is out of shape because of high speed impact on workpiece surface. and form laminated shim, metallurgical reaction also can take place or the spreading area occurs. the cooling back forms cancellated coating.

Claims (1)

1. two Spray Wire materials insulated from each other, that send to mechanical mode are sent into the atomization air flow district a bit, pass to 18-40V voltage between the Spray Wire material, the electric arc that ignites makes wire material end heating and melting and reaches superheat state, and then carries out being sprayed by high pressure draft.