Coated components, along with methods of their formation, are provided. The coated component includes a ceramic substrate having a surface; an intermediate layer on the surface of the ceramic substrate; and an environmental barrier coating on the intermediate layer. The intermediate layer includes a carbon-sink material that inhibits accumulation of free carbon from a carbon-containing species within the intermediate layer, the ceramic substrate, or both.

A thermally-actuatable gas valve assembly comprising a ceramic heater is shown and described. The gas valve assembly comprises a housing with a gas inlet and a gas outlet. A bimetal thermal actuator has a valve plug that removably seals the gas outlet from the interior of the housing. The ceramic heater is energizable to cause the thermal actuator to deflect which unseats the valve plug from the gas outlet, thereby placing the gas outlet in fluid communication with the gas inlet and the interior of the housing. A gas heating system is also shown and described in which the gas valve assembly selectively supplies cooking gas to a silicon nitride ceramic igniter. The igniter and the heater are in series such that when a source of alternating current is applied across the igniter and the heater, the igniter reaches the autoignition temperature of the combustion gas before the valve assembly opens

The present invention relates to aqueous suspensions containing 30 to 95 wt.-% metal carbide particles and a dispersant, and to a process for coating substrates using said aqueous suspensions. The invention also relates to the coated substrates that can be produced by the process according to the invention and to the uses thereof.

The present invention relates to aqueous suspensions containing 30 to 95 wt.-% metal carbide particles and a dispersant, and to a process for coating substrates using said aqueous suspensions. The invention also relates to the coated substrates that can be produced by the process according to the invention and to the uses thereof.

The present invention relates to carbon material having, on the base material, a coating layer that includes tantalum carbide (TaC), and a method for producing the carbon material. For example, the carbon material may include a base material and a coating layer on the surface of the base material. The coating layer may include TaC having average crystal grain size of 10-50 m.

The present invention relates to carbon material having, on the base material, a coating layer that includes tantalum carbide (TaC), and a method for producing the carbon material. For example, the carbon material may include a base material and a coating layer on the surface of the base material. The coating layer may include TaC having average crystal grain size of 10-50 m.

An article for use in a high-temperature environment that includes a substrate including a superalloy material, a ceramic, or a ceramic matrix composite, and an abradable coating on the substrate, the abradable coating including a rare earth silicate and a dislocator phase, the dislocator phase forms one or more distinct phase regions in the abradable coating and comprises at least one of hafnium diboride (HfB.sub.2), zirconium diboride (ZrB.sub.2), tantalum nitride (TaN or Ta.sub.2N), tantalum carbide (Ta.sub.2C), titanium diboride (TiB.sub.2), zirconium carbide (ZrC), hafnium carbide (HfC), tantalum diboride (TaB.sub.2), hafnium nitride (HfN), or niobium carbide (NbC).

An article for use in a high-temperature environment that includes a substrate including a superalloy material, a ceramic, or a ceramic matrix composite, and an abradable coating on the substrate, the abradable coating including a rare earth silicate and a dislocator phase, the dislocator phase forms one or more distinct phase regions in the abradable coating and comprises at least one of hafnium diboride (HfB.sub.2), zirconium diboride (ZrB.sub.2), tantalum nitride (TaN or Ta.sub.2N), tantalum carbide (Ta.sub.2C), titanium diboride (TiB.sub.2), zirconium carbide (ZrC), hafnium carbide (HfC), tantalum diboride (TaB.sub.2), hafnium nitride (HfN), or niobium carbide (NbC).

Ground surface comprising a substrate (110) having a Young's modulus of between 100 and 1000 GPa, and in which the ground surface has, on a working surface (120), a Vickers hardness of between 1300 and 10 000 kgf/mm.sup.2, and/or a surface coating forming the working surface, in which the surface coating contains amorphous carbon and/or titanium nitride and/or chromium nitride and/or tungsten carbide.

A method of fabricating a friction part out of composite material, the method including densifying a carbon yarn fiber preform with a matrix including at least pyrolytic carbon and a ZrO.sub.xC.sub.y phase, where 1x2 and 0y1, the matrix being formed by film-boiling or by chemical vapor infiltration from a first precursor for pyrolytic carbon and a second precursor that includes zirconium, the second precursor being a zirconium complex including an alcoxy or carboxylate ligand bonded to zirconium.