Patent ID: 9051876
Filing Date: 2015-06-09
Classification: F02B,F05C,Y10T

Abstract:
1. A heat-shielding film formed on a wall surface of a metal base material, comprising: a plurality of ceramic hollow particles; and metal phases to which the plurality of ceramic hollow particles are joined at points, wherein each of the plurality of ceramic hollow particles is joined at a point, through the metal phase, to another ceramic hollow particle among the plurality of ceramic hollow particles so that the plurality of ceramic hollow particles are joined to each other, and the plurality of ceramic hollow particles of the heat-shielding film and the wall surface are joined at points to the metal phases so that the plurality of ceramic hollow particles are joined to the wall surface, wherein the plurality of ceramic hollow particles consist of ceramic hollow particles having two different average particle sizes, a first layer of the ceramic hollow particles having a larger average particle size among the two different average particle sizes is joined to the wall surface through the metal phases, and a second layer of the ceramic hollow particles having a smaller average particle size among the two different average particle sizes is disposed above the first layer, and joined to the first layer.