Abstract: A thermal turbomachine casing having a multilayer heat insulation liner including a metallic bond coat in direct contact with the casing wall, a ceramic heat insulation layer bonded to the bond coat, and preferably an abradable coating in the form of a porous, predominantly metallic, top layer bonded to the ceramic layer. A metallic honeycomb may be fixed to the casing wall, in which case the bond coat, ceramic layer, and top layer are within the cells of the honeycomb. The bond coat and ceramic layer may partially or completely fill the honeycomb cells. The layers may be deposited by flame or plasma spraying, preferably after peening the casing wall. Each succeeding layer is deposited before any cooling of the preceeding layer.