Patent ID: 6887519

Claim:
A method for coating a hollow body, comprising the steps of: contacting a powder mixture with an inner surface of the hollow body to be coated, the powder mixture including a metal donor powder, an inert filler powder and an activator powder, the activator powder including a metal halide; and heating the powder mixture; wherein a mean particle size of the inert filler powder is approximately equal to a mean particle size of the metal donor powder; wherein the mean particle size of the metal donor powder and the mean particle size of the inert filler powder are greater than 40 Î¼m; wherein a metal donor powder content is 10% to 25% by weight of the powder mixture; wherein the metal donor powder includes a mixture of a first alloy having a donor metal content of 40% to 70% by weight and a second alloy having a donor metal content of 30% to 50% by weight; and wherein depletion of the metal donor in the first and second alloys takes place in steps with a time delay.