Bead pack brazing with energetics
US7644854B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 16, 2008 |
| Grant date | Jan 12, 2010 |
| Priority date | — |
| Expiry date | Jul 16, 2028 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/082
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method of making porous shapes from unit structures such as beads involves coating the beads with two or more layers of material deposited such that it forms an energetic material. These bi-layer energetic materials are formed from a variety of materials including, but not limited to: Ti & B, Zr & B, Hf & B, Ti & C, Zr & C, Hf & C, Ti & Si, Zr & Si, Nb & Si, Ni & Al, Zr & Al, or Pd & Al, all of which can be deposited from vapor. Pressure is applied to prevent the components from moving and the solid-state reaction between the alternating layers produces exothermic heat. Heat from the reaction alone or in conjunction of an applied brazing compound joins the beads forming a porous shape that is desired. The reaction in the materials may be activated with a small pulse of local energy that can be applied using optical, electrical, or thermal sources. Common examples include an electrical pulse, spark, hot filament, a laser beam, etc. The method reduces energy consumption and the need for specialized equipment. The reactive materials and optional brazing material are preferably applied in a fluidized CVD furnace.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.