Showing papers on "Glass microsphere published in 1969"

Structural material with controlled gas entrapment

Abstract: A STRUCTURAL MATERIAL WITH CONTROLLED GAS-ENTRAPMENT RESULTING IN AN AGGREGATE, MECHANICALLY RIGID, MATERIAL HAVING A PREDETERMINED DENSITY AND ACOUSTIC VELOCITY OF PROPAGATION, THAT IS, HAVING A PREDETERMINED ACOUSTIC IMPEDANCE, FOR USE, FOR EXAMPLE, AS AN "ACOUSTIC WINDOW" IN TORPEDO TRANSDUCERS. THE MATERIAL IS IN PART DEFINED BY THE PROCESS REQUIRED TO MAKE IT. A DISPERSION OF CAPSULES, FOR EXAMPLE, IN THE FORM OF GLASS MICROSPHERES, CONTAINING EITHER A VACUUM OR A GAS, IS INTERSPERSED INTO A CURABLE RESIN BASE, FORMING A RESIN-SAPSULE MATRIX. AFTER THE RESIN CAPSULE MATRIX IS STABILIZED, THAT IS, PARTIALLY CURED, IT IS SUBJECTED TO PRECOMPRESSION IN THE RANGE OF 5,000 TO 30,000 P.S.I DEPENDING UPON THE PREDETERMINED PROPORTION OF THE GLASS MICROSPHERS THAT IT IS DESIRED TO CRUSH, WHICH PRESSURE RESULTS IN A PREDETERMINED DENSITY OF, AND CAUSES A PREDETERMINED AMOUNT OF GAS OR AIR OR VOIDS, TO BE ENTRAPPED WITHIN THE RESIN-CAPSULE MATRIX, THUS RESULTING IN AN AGGREGATE MATERIAL WITH A PREDETERMINED IMPEDANCE.

Inorganic thermal control coatings

Abstract: Inorganic coating compositions are based on a binder obtained by gelling a suspension of synthetic mica or sodium magnesium fluorolithosilicate mineral with a solution of a soluble metal silicate or sulfate. Pigments and other additives are included to provide the desired optical properties. For solar reflector coatings zinc oxide pigment and hollow glass microspheres are employed.