Gas diffusion plate and manufacturing method for the same

1 . A gas diffusion plate comprising:

an alumina or an aluminum base material provided with one or more through holes; and

an yttria body shrink-fitted to one of the through holes, the yttria body provided with one or more gas discharge holes.

2 . The gas diffusion plate according to claim 1 , wherein an yttria thermal spray coating is provided on an exposed portion of the alumina or aluminum base material, which is exposed to a corrosive gas.

3 . The gas diffusion plate according to claim 1 , wherein the through hole of the alumina or the aluminum base material is circular, and the yttria body is cylindrical.

4 . A manufacturing method for a gas diffusion plate comprising the steps of:

preparing a prior to sintering alumina base material provided with one or more through holes and a sintered hollow yttria body provided with one or more gas discharge holes;

inserting the sintered hollow yttria body into one of the through holes of the prior to sintering alumina base material; and

sintering the alumina base material together with the sintered hollow yttria body so as to shrink-fit the hollow yttria body to one of the through holes of the alumina base material.

5 . The manufacturing method for the gas diffusion plate according to claim 4 , further comprising a step of:

performing an yttria thermal spray coating on an exposed portion of the alumina base material, which is exposed to a corrosive gas.

6 . A manufacturing method for a gas diffusion plate comprising the steps of:

preparing a prior to sintering alumina base material provided with one or more through holes and a solid sintered yttria body;

inserting the solid sintered yttria body into one of the through holes of the alumina base material;

sintering the alumina base material together with the solid sintered yttria body so as to shrink-fit the solid sintered yttria body to one of the through holes; and

drilling the solid sintered yttria body so as to form one or more gas discharge holes therein.

7 . The manufacturing method for the gas diffusion plate according to claim 6 , further comprising a step of:

performing an yttria thermal spray coating on an exposed portion of the alumina base material, which is exposed to a corrosive gas.

8 . A manufacturing method for a gas diffusion plate comprising the steps of:

preparing an aluminum base material provided with one or more through holes and a hollow sintered yttria body provided with one or more gas discharge holes;

inserting the hollow sintered yttria body into one of the through holes of the aluminum base material while heating the aluminum base;

cooling the hollow sintered yttria body and the aluminum base material so as to shrink-fit the hollow sintered yttria body to one of the through holes.

9 . The manufacturing method for the gas diffusion plate according to claim 8 , further comprising a step of:

performing an yttria thermal spray coating on an exposed portion of the aluminum base material, which is exposed to a corrosive gas.

10 . A manufacturing method for a gas diffusion plate comprising the steps of:

preparing an aluminum base material provided with one or more through holes and a solid sintered yttria body;

inserting the solid sintered yttria body into one of the through holes of the aluminum base plate;

cooling the aluminum base material and the solid sintered yttria body so as to shrink-fit the solid sintered yttria body to one of the through holes; and

drilling the solid sintered yttria body to form one or more gas discharge holes.

11 . The manufacturing method for the gas diffusion plate according to claim 9 , further comprising a step of:

performing an yttria thermal spray coating on an exposed portion of the aluminum base material, which is exposed to a corrosive gas.