Protection of turbine casings

Claim 2

A composite layered article, consisting essentially of two layers having different densities, each layer of which is a refractory heat insulating material comprising a dry composition consisting essentially of an inorganic refractory fibre and a water-sOluble binding agent, said refractory fibre and binding agent being present in a homogeneous relationship and each of said layers further having uniform hardness, strength and density across the thickness thereof.

Claim 3

A COMPOSITE LAYER ARTICLE, CONSISTING ESSENTIALLY OF TWO LAYERS HAVING DIFFERENT DENSITIES, EACH LAYER OF WHICH IS A REFRACTORY HEAT INSULATING MATERIAL COMPRISING A DRY COMPOSITION CONSISTING ESSENTIALLY OF AN INORGANIC REFRACTORY FIBRE AND A WATER-SOLUBLE BINDING AGENT, SAID REFRACTORY FIBRE AND BINDING AGENT BEING PRESENT IN A HOMOGENEOUS RELATIONSHIP AND EACH OF SAID LAYERS FURTHER HAVING UNIFORM HARDNESS, STRENGTH AND DENSITY ACROSS THE THICHNESS THEREOF.

Claim 4

A COMPOSITE LAYER ARTICLE, CONSISTING ESSENTIALLY OF TWO LAYERS HAVING DIFFERENT DENSITIES, EACH LAYER OF WHICH IS A REFRACTORY HEAT INSULATING MATERIAL COMPRISING A DRY COMPOSITION CONSISTING ESSENTIALLY OF AN INORGANIC REFRACTORY FIBRE AND A WATER-SOLUBLE BINDING AGENT, SAID REFRACTORY FIBRE AND BINDING AGENT BEING PRESENT IN A HOMOGENEOUS RELATIONSHIP AND EACH OF SAID LAYERS FURTHER HAVING UNIFORM HARDNESS, STRENGTH AND DENSITY ACROSS THE THICHNESS THEREOF.

Claim 5

A composite layered article as set forth in claim 1 wherein the inorganic fibre is at least one fibre selected from the class consisting of aluminosilicate fibre, calcium silicate fibre, asbestos, alumina, silica, zironia, and carbon fibres.

Claim 6

A composite layered article as set forth in claim 1 wherein the binding agent is at least one agent selected from the class consisting of colloidal silica sol, colloidal alumina sol, sodium silicate, potassium silicate, ethyl silicate, and metallic phosphates and borates.

Claim 7

A composite layered article as set forth in claim 1 which includes up to 10 percent by weight of a finely divided refractory material.

Claim 8

A composite layered article as set forth in claim 4 wherein said finely divided refractory material is at least one material selected from the class consisting of alumina, silica, diatomite, kieselguhr, magnesia, silicon carbide, silicon nitride and fireclay.

Claim 9

A composite layered article as set forth in claim 1 wherein said dry composition consists essentially of colloidal silica sol and aluminosilicate fibre, the silica content of the dry composition being 55-90 percent by weight.

Claim 10

A composite layered article as set forth in claim 1 which also includes a facing layer selected from the group consisting of a refractory dressing and a flame-sprayed refractory coating.

Claim 11

A COMPOSITE LAYERED ARTICLE COMPRISED ONE LAYER WHICH IS THE CASING OF TURBINE ENGINE AND ANOTHER LAYER WHICH IS A SHAPED CASING LINER REFRACTORY HEAT INSULATING MATERIAL COMPRISING A DRY COMPOSITION CONSISTING ESSENTIALLY OF AN INORGANIC REFRACTORY FIBRE AND A WATER SOLUBLE INORGANIC BINDING AGENT, SAID REFRACTORY FIBRE AND BINDING AGENT BEING PRESENT IN A HOMOGENEOUS RELATIONSHIP AND SAID LINER FURTHER HAVING UNIFORM HARDNESS, STRENGTH AND DENSITY ACROSS THE THICKNESS OF THE LINER.

Claim 12

A COMPOSITE LAYERED ARTICLE COMPRISED ONE LAYER WHICH IS THE CASING OF TURBINE ENGINE AND ANOTHER LAYER WHICH IS A SHAPED CASING LINER REFRACTORY HEAT INSULATING MATERIAL COMPRISING A DRY COMPOSITION CONSISTING ESSENTIALLY OF AN INORGANIC REFRACTORY FIBRE AND A WATER SOLUBLE INORGANIC BINDING AGENT, SAID REFRACTORY FIBRE AND BINDING AGENT BEING PRESENT IN A HOMOGENEOUS RELATIONSHIP AND SAID LINER FURTHER HAVING UNIFORM HARDNESS, STRENGTH AND DENSITY ACROSS THE THICKNESS OF THE LINER.

Claim 13

A composite layered article comprising one layer which is the casing of a turbine engine and another layer which is a shaped casing liner of refractory heat insulating material comprising a dry composition consisting essentially of an inorganic refractory fibre and a water soluble inorganic binding agent, said refractory fibre and binding agent being present in a homogeneous relationship and said liner further having uniform hardness, strength and density across the thickness of the liner.

Claim 14

A composite layered article comprising one layer which is the casing of a turbine engine and another layer which is a shaped casing liner of refractory heat insulating material comprising a dry composition consisting essentially of an inorganic refractory fibre and a water soluble inorganic binding agent, said refractory fibre and binding agent being present in a homogeneous relationship and said liner further having uniform hardness, strength and density across the thickness of the liner.

Claim 15

A composite layered article as set forth in claim 8 wherein the inorganic fibre is at least one fibre selected from the class consisting of aluminosilicate fibre, calcium silicate fibre, asbestos, alumina, silica, zirconia, and carbon fibres.

Claim 16

A composite layered article as set forth in claim 8 wherein the binding agent is at least one agent selected from the class consisting of colloidal silica sol, colloidal alumina sol, sodium silicate, potassium silicate, ethyl silicate, and metallic phosphates and borates.

Claim 17

A composite layered article as set forth in claim 8 which includes up to 10 percent by weight of a finely divided refractory material.

Claim 18

A composite layered article as set forth in claim 11 wherein said finely divided refractory material is at least one material selected from the class consisting of alumina, silica, diatomite, kieselguhr, magnesia, silicon carbide, silicon nitride and fireclay.

Claim 19

A composite layered article as set forth in claim 8 wherein said dry composition consists essentially of colloidol silica sol and aluminosilicate fibre, the silica content of the dry composition being 55-90 percent by weight.

Claim 20

A composite layered article as set forth in claim 8 wherein said shaped casing liner comprises two layers of said dry composition, the two layers having different densities and each being homogeneous and having uniform hardness, strength and density across the thickness of the shaped article.