The present invention relates to carbon material having, on the base material, a coating layer that includes 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, which may have a maximum diffraction peak value on the (111) surface, where diffraction peak values may be generated by diffractions of X-rays in XRD analysis.

The present invention relates to carbon material having, on the base material, a coating layer that includes 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, which may have a maximum diffraction peak value on the (111) surface, where diffraction peak values may be generated by diffractions of X-rays in XRD analysis.

Provided is a tubular body containing SiC fibers having high thermal conductivity. The tubular body containing SiC fibers includes a SiC fiber layer wound in a tubular form, an inner SiC coating layer covering an inner surface of the SiC fiber layer, and an outer SiC coating layer covering an outer surface of the SiC fiber layer. The inner and outer SiC coating layers are bound to each other in gaps provided in the SiC fiber layer.

Provided is a tubular body containing SiC fibers having high thermal conductivity. The tubular body containing SiC fibers includes a SiC fiber layer wound in a tubular form, an inner SiC coating layer covering an inner surface of the SiC fiber layer, and an outer SiC coating layer covering an outer surface of the SiC fiber layer. The inner and outer SiC coating layers are bound to each other in gaps provided in the SiC fiber layer.

A cutting tool, including a silicon nitride (Si.sub.3N.sub.4) ceramic substrate, and a diamond film coated on the surface of the Si.sub.3N.sub.4 ceramic substrate. The diamond film has a thickness of 7-12 μm. The cutting tool includes a tool nose, a blade, and a handle. The blade has a rake angle γ of 5-15°, a clearance angle α of 10-14°, and a helix angle of 15-45°. The blade includes four cutting edges.

A cutting tool, including a silicon nitride (Si.sub.3N.sub.4) ceramic substrate, and a diamond film coated on the surface of the Si.sub.3N.sub.4 ceramic substrate. The diamond film has a thickness of 7-12 μm. The cutting tool includes a tool nose, a blade, and a handle. The blade has a rake angle γ of 5-15°, a clearance angle α of 10-14°, and a helix angle of 15-45°. The blade includes four cutting edges.

Systems and methods for forming an oxidation protection system on a composite structure are provided. In various embodiments, an oxidation protection system disposed on a substrate may comprise a boron-silicon-glass layer or a boron layer and a silicon layer. The boron-silicon-glass layer, boron layer, the silicon layer, or a pretreatment layer may include an oxygen reactant compound.

Systems and methods for forming an oxidation protection system on a composite structure are provided. In various embodiments, an oxidation protection system disposed on a substrate may comprise a boron-silicon-glass layer or a boron layer and a silicon layer. The boron-silicon-glass layer, boron layer, the silicon layer, or a pretreatment layer may include an oxygen reactant compound.

A solid state heater and methods of manufacturing the heater is disclosed. The heater comprises a unitary component that includes portions that are graphite and other portions that are silicon carbide. Current is conducted through the graphite portion of the unitary structure between two or more terminals. The silicon carbide does not conduct electricity, but is effective at conducting the heat throughout the unitary component. In certain embodiments, chemical vapor conversion (CVC) is used to create the solid state heater. If desired, a coating may be applied to the unitary component to protect it from a harsh environment.

A solid state heater and methods of manufacturing the heater is disclosed. The heater comprises a unitary component that includes portions that are graphite and other portions that are silicon carbide. Current is conducted through the graphite portion of the unitary structure between two or more terminals. The silicon carbide does not conduct electricity, but is effective at conducting the heat throughout the unitary component. In certain embodiments, chemical vapor conversion (CVC) is used to create the solid state heater. If desired, a coating may be applied to the unitary component to protect it from a harsh environment.