| 摘要 |
<p>An improved cold spray gun apparatus and system, which prevents nozzle clogging and erosion of the nozzle material. The nozzle can be configured as a non-monolithic assembly that includes a passageway for spraying powder material. The passageway can include a converging section and a diverging section. Such an arrangement is, in part, a result of a selection of specific nozzle material for the diverging section and a cooling system. The improved cold spray gun enables applying coatings at high spray parameters (e.g., pressure up to 5 MPa, temperature up to and in excess of 1000° C.), and can achieve high quality coatings, deposition efficiency, density, adhesion and cohesion, and other advantages. Additionally, the disclosed apparatus makes it possible to spray a wide range of powder materials in commercial applications without nozzle clogging or nozzle erosion during continuous operation.</p> |
