# US 10,770,735 B2 · Protection arrangement and method of solid oxide cells

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- Number: US 10,770,735 B2
- Document ID: US10770735B2
- Status: Granted
- Kind: B2
- Application number: 15/838,953
- Filed: 2017-12-12
- Published: 2018-06-14
- Granted: 2020-09-08
- Earliest claimed: 2015-06-12
- Assignees: Elcogen Oy
- Applicants: Elcogen Oy
- Inventors: Jouni Puranen; Juha-Pekka Nikkanen; Mikko Kylmälahti
- Web page: https://patentgrep.com/patent/US10770735B2

## CPC

- H01M 8/0206: Metals or alloys
- C23C 4/11: Oxides
- C23C 4/129: Flame spraying
- H01M 8/0228: in the form of layered or coated products
- H01M 8/0245: in the form of layered or coated products
- H01M 8/12: operating at high temperature, e.g. with stabilised ZrO2 electrolyte
- H01M 2008/1293: {Fuel cells with solid oxide electrolytes}
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)

## Abstract

An object of the invention is a protection method of solid oxide cells, in which method is arranged gas flows in the cell by at least two cell structure plates made of metal. In the method is formed metal oxide material on metallic structure from liquid precursor containing at least metal ions and at least one of organic and inorganic compounds fed into thermal flame having average gas velocity over 200 m/s.

## Claims

### Claim 1

Protection method of solid oxide cells, in which method is arranged gas flows in the cell by at least two cell structure plates made of metal, wherein in the method is formed high temperature thermal flame to which liquid precursor is fed to form metal oxide compounds, said liquid precursor comprising metal ions, which form the desired coating with oxygen, said liquid precursor is formed from at least one of metal nitrates and metal acetates, and from solvent formed of at least one of organic compounds and water in which solvent at least one of metal nitrates and metal acetates are dissolved, and from organic compounds which stabilize the liquid precursor through the chelation resulting in a more homogenous mixture of metal complex, and from organic compounds that are exothermic above characteristic energy threshold level, and from organic compounds that form gases as reaction product and therefore further increase the atomization of the liquid precursor, and is formed the metal oxide compound material on the at least two cell structure plates made of metal from liquid precursor fed into thermal flame having average gas velocity over 200 m/s, and in the method controlling a flow rate at least of fuel, oxygen and liquid precursor in order to regulate thermal characteristics of the thermal spraying and to improve atomization of the precursor.

### Claim 2 (depends on 1)

Protection method of solid oxide cells according to the claim 1, wherein in the method is formed metal oxide coating on the at least two cell structure plates.

### Claim 3 (depends on 2)

Protection method of solid oxide cells according to the claim 2, wherein the metal oxide coating has a thickness less than 25 μm on the at least two cell structure plates.

### Claim 4 (depends on 1)

Protection method of solid oxide cells according to the claim 1, wherein the method is inflamed high temperature thermal flame by using as fuel for the thermal spraying compound containing hydrocarbons.

### Claim 5 (depends on 1)

Protection method of solid oxide cells according to the claim 1, wherein in the method is controlled a fraction of at least one of water, metal nitrates, metal acetates, organic compounds and solvent in liquid form in order to regulate thermal characteristics of the thermal spraying and to improve atomization of precursor.