Diffusion bonding method for microchannel plates
View Patent ↗A microchannel plate (MCP) ( 50 ) and a dielectric insulator ( 80 ) are deposited with a thin film ( 54, 84 ) using a suitable metal selected for optimum diffusion. The metallized MCP ( 50 ) and dielectric insulator ( 80 ) are then aligned and placed in a bonding fixture ( 36 ) that provides the necessary force applied to the components to initiate a diffusion bond. The bonding fixture ( 36 ) is then placed in a vacuum heat chamber to accelerate the diffusion bonding process between the MCP ( 50 ) and the dielectric insulator ( 80 ).
1. A method for bonding a microchannel plate to a dielectric insulator comprising the steps of:
the microchannel plate and the dielectric insulator are deposited with a thin film consisting of a suitable metal selected for optimum diffusion elevated temperatures and pressure over compatible exterior faces;
the metallized MCP and dielectric insulator are aligned with the dielectric insulator disposed about the periphery of the microchannel plate and placed in a bonding fixture and a compression force is applied sufficient for the compatible exterior faces of the MCP and dielectric insulator to initiate a diffusion bonding process at a selected temperature; and
the bonding fixture securing the compressed metallized MCP and dielectric insulator is placed in a vacuum heat chamber for accelerating the diffusion bond between the MCP and the dielectric insulator.
2. The method of claim 1 wherein the metal suitable for the deposition of the thin film is selected from the group consisting of gold, silver and copper.
3. The method of claim 1 wherein the dielectric insulator is a sapphire ring.
4. A microchannel plate body assembly of the type including a microchannel plate suitable for electron amplification comprises:
a microchannel plate (MCP) having a bonding surface, and a dielectric insulator unit having a bonding surface compatible with e bonding surface of the MCP; the dielectric insulator being disposed about the periphery of the microchannel plate; and
the bonding surface of the MCP being diffusion bonded to the compatible diffusion bonding surface of the dielectric insulator.
5. The invention of claim 4 wherein the dielectric insulator is a s sapphire ring.
6. The invention of claim 4 wherein the compatible surface of the MCP has a thin metallic film deposited thereon prior to bonding of the MCP and the dielectric insulator.
7. The invention of claim 4 wherein the compatible surface of the dielectric insulator has a thin metallic film deposited thereon prior to bonding of the MCP and the dielectric insulator.
8. The invention of claim 6 wherein the thin film includes a metal selected from the group consisting of gold, silver, and copper.
9. The invention of claim 7 wherein the thin film includes a metal selected from the group consisting of gold, silver, and copper.
10. The invention of claim 4 wherein the microchannel plate body assembly is adapted for use in an image intensifier tube.
11. The method of claim 1 wherein the dielectric insulator is composed of material selected from the group consisting of sapphire and silicon nitride.
12. The invention of claim 4 wherein the dielectric insulator is composed of material selected from the group consisting of sapphire and silicon nitride.