A method for manufacturing a ceramic member includes a mark process for forming a mark indicating information about a ceramic green body on the ceramic green body by using a mark material capable of being erased by a predetermined heat treatment; and a heat treatment process for erasing the mark by applying the ceramic green body to the predetermined heat treatment.

A method for manufacturing a ceramic member includes a mark process for forming a mark indicating information about a ceramic green body on the ceramic green body by using a mark material capable of being erased by a predetermined heat treatment; and a heat treatment process for erasing the mark by applying the ceramic green body to the predetermined heat treatment.

In some examples, article used as a component for a turbine engine that operates in a high temperature environment. The article may include: a ceramic or ceramic matrix composite (CMC) substrate; and a coating on the ceramic or the CMC substrate, wherein the coating defines an outer surface of the article. The coating includes a plurality of surface features defining channels on the outer surface of the article. The channels are configured to modify a flow of molten Calcia-Magnesia-Alumina Silicate (CMAS) over the outer surface of the coating in a gas flow over the outer surface of the article to reduce accumulation of the molten CMAS on the outer surface of the article.

A ceramic substrate according to an embodiment has a first surface as a front surface and a second surface as a back surface, when a midpoint of a line segment connecting a central portion P1 of the first surface and a central portion P2 of the second surface is defined as a midpoint portion C1, an amount of a component of a release agent measured at the central portion P1 of the first surface or the central portion P2 of the second surface is five times or more an amount of the component of the release agent measured at the midpoint portion C1. A ratio P1/P2 between the amount of the component of the release agent measured at the central portion P1 and the amount of the component of the release agent measured at the central portion P2 preferably satisfies 0.5P1/P22.