Method of making a thermally stable composite honeycomb panel

Details Method of making a thermally stable composite honeycomb panel Method of making a thermally stable composite honeycomb panel

1986-04-24

1987-09-08

Weston, Caleb

Stock material or miscellaneous articles

Structurally defined web or sheet

Honeycomb-like

156 89, 428408, B32B 704, B32B 3120

Patent

active

046923675

ABSTRACT:
A method for forming a thermally stable honeycomb panel which may be used constructing large mirrors employs thermally stable composite planks comprised of about 50% graphite fibers and of about 50% borosilicate glass. These planks which are formed by hot pressing in vacuum serve as a basic construction material.
The thermally stable honeycomb panel is comprised of a core member, a backplate member, and a faceplate member which are bonded by bonding process after a wet frit paste is first applied and then dried to remove volatile solvents. The bonding is completed in an oven in an air atmosphere at a temperature sufficient to melt the glass in the frit paste after the organic binder material is boiled out. After holding the honeycomb panel components at a predetermined temperature for ensuring that all the glass in the frit is melted, the bonded panel is allowed to cool to room temperature. The glass re-soldifies to form bond strengths between the core member, backplate member, and faceplate member which exhibit parent material strength.
The thermally stable honeycomb panel has a thermal expansion value in the range from about -5 to about +5 X 10.sup.-7 inch/inch/.degree.C. over a range of about 0.degree. C.-300.degree. C.

REFERENCES:
patent: 4353966 (1982-10-01), Snitzer et al.

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