Method of protecting a surface from a heat source

Claim 2

In the method of protecting a surface from a heat source by adhering a refractory heat-insulating material to the surface, said method involving the steps of applying an adhesive to the material or surface and then bringing said material and surface together to effect said bonding, the improvement which comprises applying, as the adhesive, one consisting essentially of 20-90% by weight aqueous alkali metal silicate solution, 10-80% by weight of a powdered metal selected from the class consisting of iron, copper, aluminum and aluminum alloys, and an effective amount up to 15% by weight of a fibrous refractory material.

Claim 3

The method of claim 1 wherein the surface is first primed with an aqueous alkali metal silicate solution.

Claim 4

The method of claim 1 wherein the surface is first primed with a layer of vitreous enamel.

Claim 5

The method of claim 3 wherein the vitreous enamel primer layer includes particulate refractory material of average particle size greater than the thickness of the layer.

Claim 6

The method of claim 1 wherein the alkali metal silicate of the adhesive is sodium silicate of SiO 2 :Na 2 O ratio greater than 3:1.

Claim 7

The method of claim 1 wherein the adhesive comprises at least some and up to 20% by weight of a clay.

Claim 8

The method of claim 1 wherein the adhesive comprises at least some and up to 4% by weight of a surface active agent.

Claim 9

The method of claim 1 wherein the adhesive comprises at least some and up to 20% by weight of a particulate refractory material.

Claim 10

The method of claim 1 wherein the adhesive consists essentially of the following ingredients in the indicated proportions by weight: clay at least some and up to 20% sodium silicate solution 20 - 65% refractory fiber at least some and up to 15% powdered metal 10 - 60% particulate refractory material at least some and up to 20% surface active agent at least some and up to 4%.

Claim 11

In the method of protecting the inner surfaces of metal casings for gas turbine engines and gas converters by bonding a refractory heat insulating material to said surfaces, said method involving the steps of applying an adhesive to the material or surface and then bringing said material and surface together to effect said bonding, the improvement which comprises applying, as said adhesive, one consisting essentially of 20-90% by weight aqueous alkali metal silicate solution, 10-80% by weight powdered metal selected from the class consisting of iron, copper, aluminum and aluminum alloys, and an effective amount up to 15% by weight of a fibrous refractory material.

Claim 12

In the method of protecting the inner surfaces of metal casings for gas turbine engines and gas converters by bonding a refractory heat insulating material to said surfaces, said method involving the steps of applying an adhesive to the material or surface and then bringing said material and surface together to effect said bonding, the improvement which comprises applying, as said adhesive, one consisting essentially of 20-90% by weight aqueous alkali metal silicate solution, 10-80% by weight powdered metal selected from the class consisting of iron, copper, aluminum and aluminum alloys, and an effective amount up to 15% by weight of a fibrous refractory material.

Claim 13

The method of claim 10 which includes the step, prior to applying the adhesive, of applying a layer of vitreous enamel to the surface to be bonded.