Gas-dynamic spraying method for applying a coating

• US 5,302,414 A
• Filed: 02/02/1992
• Issued: 04/12/1994
• Est. Priority Date: 05/19/1990
• Status: Expired due to Term

• Current Assignee: Peter Richter
• Original Assignee: Anatoly Nikiforovich Papyrin
• Inventors: Papyrin, Anatoly N., Nesterovich, Nikolai I., Shushpanov, Mikhail M., Alkhimov, Anatoly P., Kosarev, Vladimir F.
• Primary Examiner(s): Owens, Terry J.
• Application Number:
  US07/781,233
• Time in Patent Office: 800 Days
• Field of Search: 427/34, 427/189, 427/190, 427/191, 427/192, 427/195, 427/422, 427/423, 427/427, 427/421, 427/447, 427/455, 427/456, 419/9, 428/937
• US Class Current: 427/192
• CPC Class Codes: B05B 7/144 the means for supplying particulate material comprising moving mechanical means B05B7/1422, B05B7/1459 take precedence
• CPC Class Codes: B05B 7/1486 for spraying particulate material in dry state
• CPC Class Codes: C23C 24/04 Impact or kinetic deposition of particles

Abstract

A cold gas-dynamic spraying method for applying a coating to an article introduces into a gas particles of a powder of a metal, alloy, polymer or mechanical mixture of a metal and an alloy, the particles having a particle size of from about 1 to about 50 microns. The gas and particles are formed into a supersonic jet having a temperature considerably below a fusing temperature of the powder material and a velocity of from about 300 to about 1,200 m/sec. The jet is directed against an article of a metal, alloy or dielectric, thereby coating the article with the particles.

Claims

1. A gas-dynamic spraying method for applying a coating to an article, the method comprising:

introducing into a gas particles of a powder of at least one first material selected from the group consisting of a metal, alloy, polymer and mechanical mixture of a metal and an alloy, the particles having a particle size of from about 1 to 50 microns;

forming the gas and particles into a supersonic jet having a temperature sufficiently low to prevent thermal softening of the first material and a velocity of from about 300 to about 1,200 m/sec.; and

directing the jet against an article of a second material selected from the group consisting of a metal, alloy and dielectric, thereby coating the article with the particles.

2. The method of claim 1, wherein the gas is selected from the group consisting of air, helium and a mixture of air and helium.

3. The method of claim 1, wherein the temperature of the jet is room temperature, the gas is air, the first material is aluminum and zinc and a flow rate of the particles in the jet is at least 0.05 g/sec. cm².

4. The method of claim 1, wherein the temperature of the jet is from about 30°

C. to about 400°

C.

5. The method of claim 2, wherein the temperature of the jet is from about 30°

C. to about 400°

C.

6. The method of claim 1, wherein forming the jet comprises forming the jet with a cross section having one maximum dimension bigger than a perpendicular maximum dimension.