Cement

Patent metadata

Field	Value
Publication number	US-2020102249-A1
Application number	US-201916578806-A
Country	US
Kind code	A1
Filing date	Sep 23, 2019
Priority date	Sep 28, 2018
Publication date	Apr 2, 2020
Grant date	—

Abstract

The present disclosure relates to a cementious composition (e.g. for mounting a strain gauge within a gas turbine engine) comprising: part A comprising an acidic solution of a metal salt; part B comprising silica and one or more metal oxides; and part C comprising colloidal silica and/or a silicate solution. Part A may comprise an acidic aluminium phosphate solution. Part B may comprise one or more or all of titanium oxide, chromium oxide, alumina and barium oxide

First claim

1 . A cementious composition comprising:
part A comprising an acidic solution of a metal salt; part B comprising silica and one or more metal oxides; and part C comprising colloidal silica and/or a silicate solution.

2 . A composition according to claim 1 wherein the metal salt is an aluminium salt.

3 . A composition according to claim 2 wherein part A may comprise an acidic aluminium phosphate solution.

4 . A composition according to claim 1 wherein part B comprises silica having a particle size of between 10 to 100 microns.

5 . A composition according to claim 1 wherein part B comprises silica in an amount between 70 and 80 wt %.

6 . A composition according to claim 1 wherein part B comprises one or more metal oxides selected from the group consisting of transition metal oxides, aluminium oxide, and/or alkaline earth metal oxides.

7 . A composition according to claim 6 wherein part B comprises a mixture of two or more metal oxides.

8 . A composition according to claim 7 wherein part B comprises the combination of one or more transition metal oxide with an alkaline earth metal oxide and/or alumina.

9 . A composition according to claim 8 wherein part B comprises the combination of one or more transition metal oxide with an alkaline earth metal oxide and alumina.

10 . A composition according to claim 8 wherein part B comprises two transition metal oxides.

11 . A composition according to claim 6 wherein part B comprises one or more or all of titanium oxide, chromium oxide, alumina and barium oxide

12 . A composition according to claim 1 wherein part C comprises colloidal silica or a potassium or sodium silicate solution.

13 . A cement formed by mixing parts A, B and C of the cementious composition according to claim 1 .

14 . The cement of claim 13 formed by mixing parts A and C in a ratio of between 1.5:10 and 4.5:10 (v/v) and then adding part B.

15 . The cement of claim 14 formed by mixing parts A and C and then adding 55-65 wt % of part B.

16 . A method of bonding a first component and a second component said method comprising: preparing a cement according to claim 13 , applying the cement to at least one of the first and second components, abutting the components to allow the cement to bond them together.

17 . A method according to claim 16 comprising applying the cement to the first component, curing said cement and affixing the second component to the first.

18 . A method according to claim 17 wherein curing the cement comprises a plurality of curing periods wherein each successive curing period is at a higher temperature than the previous curing period.

19 . A method according to claim 16 wherein the first component is selected from a blade, vane, disc and casing and the second component is selected from a strain gauge and a lead-out wiring.

20 . A gas turbine engine comprising a first component and a second component, wherein the first and second components are bonded together using the method of claim 16 .

Assignees

• Rolls Royce Plc

Inventors

• Mackilligin Harry

Classifications

• F01D21/003

  Arrangements for testing or measuring (for measuring vibrations G01H) · CPC title

• C04B28/344 Primary

  the phosphate binder being present in the starting composition solely as one or more phosphates · CPC title

• C04B14/062

  Microsilica, e.g. colloïdal silica (preparing microsilica slurries or suspensions C04B18/148) · CPC title

• C04B2103/0025

  Compounds of the transition metals · CPC title

• C04B14/045

  Alkali-metal containing silicates, e.g. petalite (waterglass C04B12/04) · CPC title