Inorganic strain gauge

1 . A device for measuring a deformation, the device comprising:

a deformable body; and

a strain gauge, the strain gauge comprising a support in contact with the deformable body and a metallic resistive member in contact with the support,

wherein the resistive member has a resistance which can vary with a deformation of the deformable body, and

wherein the support is electrically insulating, porous and made of at least one support material comprising at least one refractory ceramic compound, the ceramic compound comprising a hydrated cement and/or a cured ceramic adhesive.

2 . The device as claimed in claim 1 , wherein a porosity of the support is between 10% and 40%.

3 . The device as claimed in claim 1 , the support material being constituted by a hydrated cement and/or a cured ceramic adhesive.

4 . The device as claimed in claim 1 , the ceramic compound representing more than 50% of a mass of the support material.

5 . The device as claimed in claim 4 , the ceramic compound being chosen from Al 2 O 3 , AlN, SiO 2 , MgO, a mica, SiC, ZrO 2 , ZrSiO 2 , CaO, Cu 2 O, CuO, Y 2 O 3 , indium-tin oxide, TiO 2 and mixtures thereof.

6 . The device as claimed in claim 1 , the ceramic compound being an oxide.

7 . The device as claimed in claim 1 , wherein a thickness of the support is between 0.025 mm and 5.00 mm.

8 . The device as claimed in claim 1 , the resistive member being a hydrated cement filled with a metal.

9 . The device as claimed in claim 1 , the support being a single-layer support.

10 . A method for manufacturing a device for measuring a deformation as claimed in claim 1 , the method comprising:

a) forming at least one layer by depositing a composition on a deformable body;

b) curing the at least one layer so as to form a support; and

c) depositing a resistive member in contact with the support.

11 . The method as claimed in claim 10 , the composition being a cement paste or a ceramic adhesive.

12 . The method as claimed in claim 10 , the composition being coated, in step a), on the deformable body.

13 . The method as claimed in claim 10 , comprising the printing of the resistive member on the support.

14 . The method as claimed in claim 13 , the printing being carried out by a technique chosen from screen printing or extrusion of a metallic ink or of a metallic paste, and inkjet printing of a metallic ink.

15 . The method as claimed in claim 13 , the resistive member being printed by an additive manufacturing technique.

16 . A method for measuring a deformation, comprising:

providing a device as claimed in claim 1 ,

heating the deformable body to a temperature greater than 400° C., and

measuring the deformation of the body with the strain gauge.

17 . A device for measuring a deformation, the device comprising:

a deformable body; and

a strain gauge, the strain gauge comprising a support in contact with the deformable body and a metallic resistive member in contact with the support,

wherein the resistive member has a resistance which can vary with a deformation of the deformable body,

wherein the support is electrically insulating, porous and made of at least one support material comprising at least one refractory ceramic compound, and

wherein the resistive member is a hydrated cement filled with a metal.

18 . The device as claimed in claim 17 , wherein a porosity of the support is between 10% and 40%.

19 . The device as claimed in claim 17 , the ceramic compound representing more than 50% of a mass of the support material.

20 . The device as claimed in claim 19 , the ceramic compound being chosen from Al 2 O 3 , AlN, SiO 2 , MgO, a mica, SiC, ZrO 2 , ZrSiO 2 , CaO, Cu 2 O, CuO, Y 2 O 3 , indium-tin oxide, TiO 2 and mixtures thereof.