摘要:
Silica may be deposited on metal surfaces eg on heat exchanger surfaces to reduce undesirable deposits by the following aqueous process. Finely divided moist silicic acid of defined particle size is mixed with hot (eg at least 98.5°C) pure water for not more than 1 hour. The mixture is subjected to depolymerisation by heating at specified pH so as to depolymerise substantially all the silica. The resulting aqueous silica is then passed over the surface to be coated at temperature above 80°C so as to deposit a hard bound silica coating.
摘要:
A substrate is provided with a refractory oxide coating by contacting the substrate with a dispersion of' a solid particulate phase in a liquid phase, subsequently followed by firing to produce the coating, the dispersion comprising at least a first and a second refractory oxide component. In order to produce a coating of controlled purity, e.g. for certain catalytic, electronic or other applications, the first refractory oxide component (e.g. an alumina) is obtained from a purifiable liquid or solid precursor therefor and constitutes part at least of the solid phase, and the second refractory oxide component is either obtained from a purifiable liquid or solid precursor therefor and constitutes part of the solid phase or is a purifiable liquid precursor (e.g. a water-soluble silicone) constituting part at least of the liquid phase.
摘要:
The invention relates to a method for manufacturing a brake disc (1) for a motor vehicle, wherein a protective layer is placed on a main body (2) of the brake disc (1). It is proposed that the method comprise at least the following steps: preliminary machining of at least some regions of the main body (2) in the blank; applying an enamel coating (10) to at least some regions of the main body (2), and post-treating the at least partially coated main body (2), the enamel coating (10) being metallurgically joined to the basic material of the main body (2) by phase formation.
摘要:
The present invention relates to an abradable coating for a turbine engine part, characterized by the fact that said coating includes a layer made of an abradable material, the surface asperities of which are filled with thermally bonded ceramic grains, forming a smooth, free surface having a low roughness.
摘要:
A substrate is provided with a refractory oxide coating by contacting the substrate with a dispersion of' a solid particulate phase in a liquid phase, subsequently followed by firing to produce the coating, the dispersion comprising at least a first and a second refractory oxide component. In order to produce a coating of controlled purity, e.g. for certain catalytic, electronic or other applications, the first refractory oxide component (e.g. an alumina) is obtained from a purifiable liquid or solid precursor therefor and constitutes part at least of the solid phase, and the second refractory oxide component is either obtained from a purifiable liquid or solid precursor therefor and constitutes part of the solid phase or is a purifiable liquid precursor (e.g. a water-soluble silicone) constituting part at least of the liquid phase.
摘要:
Improvement in the manufacture of oriented grain steel sheet. The improvement relates to coating step of the sheet with annealing separators in order to obtain a complete purification of the steel from harmful components as well as the production, during the annealing step, of a continuous and adherent layer of glass film having the same and constant thickness on both surfaces of the steel sheet. The invention consists in that the coating of the sheet with said annealing separator is carried out from a suspension of annealing separator in a suspension medium having a non-aqueous base, preferably commercial ethyl alcohol containing limited and controlled amounts of water, using the continuously passing steel sheet as the cathode of an electrophoretic cell, the anodes being a couple of electrodes placed in, and near the free surface of, the bath, simmetrically with respect to the steel sheet.