Warm spray coating method and particles used therefor

摘要

A coating method of the invention is characterized by using particles each being an aggregate comprising particles far smaller than that, and heating them at a temperature lower than the melting point and blowing and depositing the same to an object to be treated at a supersonic velocity. The warm spray of the invention is characterized in that standard particles and addition particles with a particle diameter larger than that are mixed so that the K-value determined by the following relation is 1 or more and 2 or less: K=A×(B/C)×D, A: mass % of the content of additive particles, B: center particle diameter of standard particle (μm), C: center particle diameter of additive particle (μm), D: (maximum particle diameter−minimum particle diameter) of additive particle/10 (μm). The invention intends to deposit micro oxide crystals without using an adhesive or the like, with no alteration to the function thereof, and also attain a dense layer with no substantial voids.

主权项

1. A warm spray coating method, comprising:
providing a plurality of aggregates, wherein
each aggregate comprises a binder comprising an organic compound, andparticles having an identical composition and having a particle diameter smaller than a diameter of the aggregate, andeach aggregate does not comprise other particles; heating and blowing the aggregates in a warm spray having a temperature of 4×102° C. to 25×102° C. at a supersonic velocity on an object to be treated, wherein
the aggregates are heated to a temperature equal to or higher than a sublimation or vaporization temperature of the binder and equal to or lower than a phase transition temperature of the particle; and depositing the particles on the object.