초록 ▼

A method for generating fine sprays of molten metal for spray coating and powder making is disclosed. Liquid metal is fed via a melt tube to a nozzle that is shaped like the frustrum of a cone. The nozzle is surrounded with gas jets in a coaxial pattern around the melt tube orifice. High pressure ga

A method for generating fine sprays of molten metal for spray coating and powder making is disclosed. Liquid metal is fed via a melt tube to a nozzle that is shaped like the frustrum of a cone. The nozzle is surrounded with gas jets in a coaxial pattern around the melt tube orifice. High pressure gas causes the formation of a low pressure region immediately next to the melt tube orifice that draws metal out of the orifice at a higher rate than would otherwise be the case. The coaxial gas stream atomizes the metal into droplets and thereafter forms a narrow, supersonic spray containing very fine metal droplets suitable for powder making or application of a coating.

대표청구항 ▼

A method for generating a supersonic spray of atomized metal droplets, employing a melt nozzle having an exterior surface portion in the shape of the frustrum of a cone with a melt tube orifice at the center of the nozzle and with a plurality of gas jets coaxial to the nozzle flowing over said exter

A method for generating a supersonic spray of atomized metal droplets, employing a melt nozzle having an exterior surface portion in the shape of the frustrum of a cone with a melt tube orifice at the center of the nozzle and with a plurality of gas jets coaxial to the nozzle flowing over said exterior surface portion, comprising the steps of: (a) liquifying metal and allowing it to flow into the melt tube orifice; (b) positioning the respective gas jets over circularly-spaced portions of the exterior surface portion so that a vector describing the direction of each gas jet has a positive first component in the same direction as the direction of metal flow from the melt tube orifice and a positive second component perpendicular to the direction of metal flow from the melt tube orifice; (c) establishing the input pressure to the gas jets at a pressure in excess of 1000 psig sufficient such that a pressure comes to exist at the melt tube orifice that is of smaller magnitude than that which exists when the gas jets are at zero input pressure; and, (d) adjusting the relative magnitudes of said first component and said second component of the gas jet direction vectors such that a spray having supersonic speed is produced.